JPH04113052A - Speed reducer - Google Patents

Abstract

PURPOSE:To freely set a power transmission channel by linking element speed reducers together through a first and a second linked mechanism which can be linked together under the state of permitting inclination between a rotation axis of one of the speed reducers and a sun gear of the other speed reducer, and mutually between fixed cases of one and the other speed reducers. CONSTITUTION:A spherical gear 211 is formed on the end of a rotation axis 171, and a U-shaped section recessed groove 222 having inner teeth where the end of the rotation axis 171 fits, is provided on the right end surface of a sun gear 152 which constitutes an adjoining element speed reducer 112. For this reason, the directions of the rotation axes 171, 172 of one of the element speed reducer 111 and the other element speed reducer 112 become changeable within the range of about 20 deg. whereby constituting a first linked mechanism 30 of the mutually adjoining element speed reducers 111, 112 which can be linked together in an inclined state of a specified angle. A second linked mechanism 40, which can link the speed reducers 111, 112 together in a state of permitting inclination in a specified angle, is also constituted by means of a protrusion 181 on a fixed case 131 and a recessed groove 192 on a fixed case 132.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reduction gear that reduces the rotation of an input shaft at a predetermined speed ratio and transmits the rotation to an output shaft.

[Background technology]

2. Description of the Related Art Among devices using a motor or the like as a power source, many devices transmit the rotational driving force of the power source to a load via a reduction gear.

As such a reducer, for example, as shown in FIG. 3, an input shaft 50A and an output shaft 50B are perpendicular to each other, or a
As shown in the figure, in most cases, the input shaft 60A and the output shaft 60B are coaxial (concentric). Among these, those in which the input and output shafts are orthogonal are generally based on a bevel gear or worm gear mechanism, and those in which the input and output shafts are concentric are generally in a planetary gear mechanism using a combination of normal spur gears. However, there are also known systems that utilize a trochoidal inscribed planetary mechanism (Japanese Patent Laid-Open No. 59-183144, etc.).

[Problem to be solved by the invention]

As mentioned above, in conventional reducers, the two-direction positional relationship between the input shaft and the output shaft is determined in advance.
There is a problem in that the power transmission path between a power source such as a motor and a load such as an actuator is restricted to some extent, and the installation of the motor etc. cannot be used depending on the relationship with the position. Furthermore, if there is little space to install the reducer, there is also the disadvantage that it is not possible to set the desired speed ratio because the size of the reducer changes when the speed ratio changes.

[Purpose of the invention]

An object of the present invention is to improve the disadvantages of the conventional example and, in particular, to provide a flexible speed reducer that allows the power transmission path to be freely set.

(Means for Solving the Problems) The present invention consists of a plurality of element reducers connected in sequence,
Each of the element speed reducers includes a fixed case in which an internal gear is formed in a part of the inner circumference, at least two planetary gears that mesh with the internal gear, and a sun gear that meshes with these planetary gears. It is configured to include a rotating shaft that is integral with the arm of the planetary gear and concentric with the sun gear. The element reducers that are adjacent to each other are provided with a first coupling mechanism that is provided between one rotating shaft and the other sun gear, and that is capable of coupling the two at a predetermined angle. The two fixed cases are connected to each other via a second connecting mechanism which is provided between the two fixed cases and can be connected to each other while allowing the two fixed cases to be tilted at the predetermined angle. This aims to achieve the above-mentioned objective.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 2 shows a case where the reduction gear according to the present invention is applied to a jacking device.

In FIG. 2, the rotational force of a motor 4 as a drive source is transmitted to the shaft of a worm gear 2, which constitutes the human power section of the screw jack 1, via a reduction gear 10. The worm gear 2 meshes with a reduction gear 5 that moves the elevating screw 3 in the vertical direction.

Therefore, due to the rotation of the motor 4 in a predetermined direction, the reducer 10
The worm gear 2 is rotated through the worm gear 2, and this rotational force causes the lifting screw to move upward through the reduction gear 5, thereby lifting the weight 7 on the top plate 6 upward.

Here, the speed reducer 10 is configured by sequentially connecting element speed reducers 11 that are configured in substantially the same manner as will be described later.

In FIG. 1, two adjacent element reducers 11.
．． 11□ is shown. In this figure, each element reducer 11 includes a fixed case 13 in which an internal gear 12 is formed in a part of its inner periphery, two planetary gears 14 and 14 that mesh with the internal gear 12, and these planetary gears. It is configured to include a sun gear 15 that meshes with the gear 14, and a rotating shaft 17 that is integral with a disk 16 that forms an arm of the planetary gear 14 and is concentric with the sun gear 15.

To explain this in more detail, the fixed case 131 on the one side (on the right side in the figure) is formed into a stepped cylindrical shape as a whole as shown in the figure, and the inner circumference from the small diameter part to the large diameter part is An internal gear 12+ is formed. Further, the opening end 13A on the left side in the drawing of the portion where the internal gear 121 is formed is formed in an arcuate cross-section so that its inner diameter gradually widens as it approaches the opening end. on the other hand,
This open end 13A has the other adjacent fixed case 1
Right end outer peripheral part 1 in the figure formed in the cross-sectional arc shape of 32
3B are fitted, and both cross-sectional arcuate portions 13A, 1
3B, the refixation case 13.3B is fitted with the refixation case 13. ,1. A protrusion 18 that restricts mutual rotation of L and allows up and down rotation in the figure. and a groove 19□ are provided, respectively.

Said two-way star gear 14. ,14. are respectively installed via bearings on shafts 201 provided toward the right on the right end surface in the 16° view of the disk. The sun gear 15 is meshed with both the inverted star gears 14+ and IL and is installed in the center of the disk 16 via a bearing. Also, disk 16. In the figure, a sun gear 15. is shown protruding leftward on the left end surface in the figure. The rotating shaft 171 is provided concentrically with the rotating shaft 171 . This rotating shaft 17,
At the tip of the spherical gear 21. is formed on the right end surface of the sun gear 15□ constituting the adjacent element reducer 11□. A groove 22□ having a U-shaped cross section and having internal teeth into which the tip of the groove 22 is fitted is provided. Therefore, in this embodiment, one element reducer 11. and the rotating shaft 17 of the other element reducer 11□. ．． The direction of 17□ can be changed within a range of about 20° as shown. That is, in this embodiment, the rotating shaft 17. A spherical gear 21° at the tip of the sun gear 15 and a U-shaped groove 22 in cross section with internal teeth formed on the right end surface of the sun gear 15
．． ．． A first connection mechanism 30 is configured that can connect the 11□s in a state tilted at a predetermined angle. Further, in this embodiment, a second connection mechanism 40 is configured by the aforementioned protrusion 18 and the groove 19□, which can connect the two to each other while allowing the predetermined angle of inclination.

For this reason, the rotating shaft of the element reducer further to the right, indicated by the symbol A in the figure, is used as the input shaft, and when the input shaft A rotates in a predetermined direction, one sun gear 15+ rotates in unison with the input shaft A.
As a result, the planet gear 14°14 and the sun gear 15.
It rotates in the opposite direction to the input shaft A while meshing with the internal gear 12 around it, while not revolving in the same direction as the input shaft A.

As a result, the planetary gear 14. ．． 14. A rotating shaft 17 provided on a disk 16 constituting an arm of. is decelerated at a predetermined speed ratio and rotates in the same direction as the input shaft A.

Kokote, one element reducer 11. , the rotation speed of input shaft A is set to N1. The number of rotations of the output shaft, that is, the rotating shaft 171, is N.
2. Sun gear 15. The number of teeth is ZA, the planetary gear is 14. Let Zs be the number of teeth of the internal gear and Z be the number of teeth of the 12° internal gear, Zc /ZA= (N1 Nz ) / (ONr )
The relationship holds true. Therefore, the speed ratio Nz/NI of this element reducer 111 is Nz/N+ =ZA/ (ZA+Zc)...
... becomes ■. The speed ratios of other element reduction gears are found in the same way.

In FIG. 1, reference numeral 22 denotes a rubber cover provided between adjacent fixed cases. This cover 23 is provided to prevent dirt and the like from entering the inside of the reducer.

In addition, in FIG. 2, the rotation shaft of the motor 4 is directly connected to the sun gear that constitutes the endmost element reducer on the motor 4 side, and the rotation shaft that constitutes the endmost element reducer of the jack 1 example The shaft is directly connected to the shaft of the worm gear 2.

Therefore, as shown in FIG. 2, it is possible to supply power from the motor 4 to the jack 1 from a remote location.

As explained above, according to this embodiment, one reduction gear is constructed as a collection of units by unitizing the element reduction gear, so power can be transmitted from a distance, and between each element reduction gear. The first and second
Due to the action of the connection mechanism, when connecting element reducers, it is possible to connect one element reducer with the shaft and fixed case of the other element reducer tilted within a range of approximately 2°. This made it possible to transmit power through a flexible route. In addition, as is clear from the above formula 0, the speed ratio of each element reducer is determined by the number of teeth of the sun gear and the number of teeth of the internal gear, so it can be arbitrarily set within a certain range, and the speed ratio By appropriately combining different element reducers, it is possible to set the speed ratio within a fairly wide range. Also, for example, the number of teeth of the internal gear formed in the fixed case,
When the size is constant, the sizes of the element reducers can be made constant by changing the number and size of the teeth of the sun gear and the number and size of the planetary gears. Furthermore, to connect the element reducers, simply insert one rotary shaft into the recess of the other sun gear, simultaneously insert one fixed case into the other fixed case, and cover with a rubber cover.
It's very simple.

Note that if the length needs to be adjusted, it can be easily done using a universal joint or the like.

〔Effect of the invention〕

As explained above, according to the present invention, a single speed reducer is constructed from a plurality of element speed reducers that are sequentially connected. First and second coupling mechanisms that enable power to be supplied to a load such as an actuator located at a remote location, and that enable connection of mutually adjacent element reducers with the two inclined at a predetermined angle. Because they are connected via a flexible route, power can be transmitted through
The installation of the motor and actuator can be used at any time without being affected by the location, and the speed ratio of each element reducer is determined by the number of teeth of the sun gear and the number of teeth of the internal gear, so it can be used to some extent. By appropriately combining element reducers with different speed ratios, the speed ratio can be set within a fairly wide range. Therefore, it is possible to provide a flexible reduction gear in which the power transmission path can be set more freely than ever before.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the specific configuration of an element reducer constituting a reduction gear according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the overall configuration of the example of the above embodiment, Figures 3 to 4
The figure is an explanatory diagram showing a conventional example. 11. 11□・・・Element reducer, 12. ．． 12
2... Internal gear, 13. ．． 13□・・・・・・
Fixed case, 14. 14□・・・・Planetary gear, 1
5. ．． 15□・・・Sun gear, 16. ．． 16□・
...Disk forming the arm of the planetary gear, 17. ．． 17□・
...Rotating shaft, 30...First connection mechanism,
40...Second connection mechanism. Patent Applicant Suzuki Motor Co., Ltd. Agent Patent Attorney Isamu Takahashi Figure 1 Figure 2 +2+, 1L...Internal gear 13+, 13m...Fixed case +4. ．． 141
... Planetary brass wheel +5. , +51... Sun gear +6+, lL... Disk forming the arm of the river play l gear 176.
17+... Rotating shaft 30... First connection at horizontal 40...1112 connection mechanism

Claims (1)

[Claims] (1) Consisting of a plurality of element reducers connected in sequence, each element reducer includes a fixed case in which an internal gear is formed in a part of its inner circumference, and at least two elements that mesh with the internal gear. It is configured to include planetary gears, a sun gear that meshes with these planetary gears, and a rotating shaft that is integral with the arm of the planetary gear and is concentric with the sun gear, and the element reducers that are adjacent to each other are A first coupling mechanism is provided between the rotating shaft of the first gear and the other sun gear, and is capable of coupling the two in a state of inclination at a predetermined angle; A speed reducer characterized in that the speed reducer is connected via a second connection mechanism that can be connected to each other while allowing a predetermined angle of inclination.