CN213360967U - Parallel multistage gear and multi-cycloid differential speed reducing mechanism with same - Google Patents

Abstract

The utility model discloses a parallelly connected multistage gear and have differential reduction gears of many cycloid of this gear, include: the gear is a cycloid gear or a pin gear, the tooth profile of the cycloid gear comprises a cycloid external gear tooth profile and a cycloid internal gear tooth profile, and the end faces of two adjacent gears on the gear are overlapped or have a certain distance. The parallel multistage gears are applied to the cycloid speed reducer, and speed difference formed by different meshing transmission ratios of the multistage gears and each single-stage gear in the speed reducer is utilized to realize speed reduction, so that the speed reducing mechanism can realize larger speed reducing ratio in a limited space and is convenient to miniaturize. Meanwhile, the problems of complex structure and multiple parts and bearings of the speed reducer are solved, and the speed reducing mechanism using the parallel multi-stage gear can also have the characteristic of one input and multiple outputs.

Description

Parallel multistage gear and multi-cycloid differential speed reducing mechanism with same

Technical Field

The utility model relates to a multistage gear, concretely relates to parallelly connected multistage gear and have many cycloid differential reduction gears of this gear belongs to mechanical transmission technical field.

Background

The gear refers to a mechanical element with a gear on a wheel rim continuously engaged to transmit motion and power, and the structural classification generally comprises gear teeth, tooth grooves, end faces, normal faces, addendum circles, dedendum circles, base circles and reference circles. The use of gears in transmissions has long emerged. At the end of the 19 th century, the principle of generating the cutting method and the successive appearance of special machine tools and cutters for cutting teeth by using the principle pay attention to the running stability of gears along with the development of production.

The cycloid gear is a general name of the gear with the tooth profile of various cycloid or equidistant curve. Cycloid gears are widely used in reducers, such as cycloid pin gear reducers, RV reducers, and the like. Reducers using cycloid gears may be collectively referred to as cycloid reducers. In the operation process of the cycloidal reducer, all teeth are engaged theoretically, so that the rigidity and the strength of the cycloidal reducer far exceed those of a planetary reducer and a harmonic reducer, and the cycloidal reducer is widely applied to the fields of industrial automation, aerospace and the like.

The Chinese patent with the application number of 201410369326.1 discloses a simple cycloid gear reducer, and relates to the technical field of mechanical equipment. The eccentric excircle in the middle of the input crankshaft is provided with a cylindrical roller bearing, two ends of the input crankshaft are respectively supported on the input flange and the output flange by the cylindrical roller bearings, and the two outer sides of the input flange and the output flange are provided with rotating skeleton oil seals, the outer side of the cylindrical roller bearing is sleeved with a cycloid gear, the outer tooth surface of the cycloid gear is meshed with a gear needle arranged in the shell, one end of the cycloid gear is provided with two bosses which are connected with two holes on a four-hole transmission piece through cylindrical rollers, and the other two holes of the four-hole transmission part are also connected with the output flange through cylindrical rollers, the outer side of the output flange is sleeved with a cylindrical cross roller, the outer side of the cylindrical cross roller is sleeved with a bearing gland which is only provided with a cycloid gear, and the four-hole transmission part is used for transmission, so that the torque is large, the structure is simple, the number of parts is small, the manufacturing cost is low, and the installation and the use are very convenient.

The existing cycloid speed reducer is complex in structure, multiple in parts and bearings and difficult to achieve small-size large-speed reduction ratio, only Spinea company of silovac can achieve the volume of the cycloid speed reducer in the level of a harmonic speed reducer in the industry at present, but the existing cycloid speed reducer is still difficult to achieve the volume of below 60 mm. However, with the continuous development of automation technology and robot technology, the demand for speed reducers with high rigidity, small volume, large speed reduction ratio and long service life is increasing.

Disclosure of Invention

The utility model aims at providing a novel multi-stage gear and have this multi-stage gear's many cycloid differential reduction mechanism to the above-mentioned problem that exists among the prior art.

In order to achieve the above object, the utility model adopts the following technical scheme:

the parallel multistage gear has n stages, cycloidal or pin gear tooth profile and certain distance between the end faces of adjacent two stages.

Preferably, the parallel multi-stage gear is formed by integral machining or by assembling a plurality of gears with the number of stages smaller than n, wherein the gear teeth can be assembled into one gear by using a plurality of single teeth or multiple teeth embedded on the gear matrix. For example, when the teeth of the multi-stage gear are pin teeth, the multi-stage pin gear can be assembled by inserting a pin into a gear body.

Preferably, the aforementioned assembly molding is: one or more of pins, screws and welding.

More preferably, the aforementioned n is an integer of not less than 2.

Still preferably, when the gear tooth profile is a cycloid tooth profile, the cycloid tooth can be selected from a cycloid internal gear and a cycloid external gear, and the tooth heights of the cycloid teeth must be equal.

Further preferably, in the pin gear, the integrally formed pin gear is simply deformed by rounding or the like, and the deformed pin gear is regarded as the pin gear.

A multiple cycloid differential reduction mechanism comprising n single stage gears, bearings, eccentric shaft means and a parallel multiple stage gear as hereinbefore described meshed with the single stage gears.

And, the aforesaid eccentric device includes the eccentric shaft and sets up the balancing piece on the eccentric shaft.

The utility model discloses an useful part lies in:

the utility model discloses in parallelly connected multistage gear can apply the cycloid reduction gear, utilize in parallelly connected multistage gear and the reduction gear transmission ratio of each single stage gear meshing different and the speed difference that forms to realize the speed reduction of mechanism for this type of reduction gear can realize great reduction ratio in the finite space, is convenient for miniaturize. Meanwhile, the problems that the speed reducer is complex in structure and multiple in parts and bearings are solved, and the speed reducer can also have the characteristic of one input and multiple outputs.

Drawings

Fig. 1a and 1b are schematic tooth profiles of a cycloid external gear and a cycloid internal gear of the present invention;

FIG. 2 is a schematic view of the tooth profile of the pin gear of the present invention;

fig. 3a and 3b are schematic diagrams illustrating different deformation of the tooth profile of the needle according to the present invention;

figure 4 is an axonometric view of example 2 of the invention;

fig. 5 is an axonometric view of example 3 of the present invention;

figure 6 is an axonometric view of example 4 of the invention;

figure 7 is an axonometric view of example 5 of the invention;

fig. 8 is an isometric view of example 1 of the present invention;

fig. 9 is an exploded view of an example 2 application case of the present invention;

fig. 10 is a sectional view of an example of the present invention 2.

The meaning of the reference symbols in the figures:

1-1 single-stage needle gear, 1-2 single-stage needle gear, 1-3 single-stage needle gear, 2-parallel three-stage cycloid external gear, 3-eccentric shaft, 4-balance block, 5-end cover, 6-bearing seat and 7-tooth needle.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

The utility model discloses example 1 refers to fig. 5, and this embodiment is parallelly connected tertiary cycloid external gear, including three single-stage cycloid external gears, wherein, has certain distance between the terminal surface of three single-stage cycloid external gears, and the profile schematic diagram of cycloid external gear is shown in fig. 1a, can also carry out the nimble application with embodiment 2 specifically, as long as can constitute corresponding reduction gears, this is that the skilled person in the art understands and changes very easily, and the description is not repeated here;

example 2

The utility model discloses refer to in example 1 and refer to fig. 9 and 10 in being applied to many cycloid differential reduction gears, its theory of operation as follows: the reducer comprises 3 single-stage pin gear wheels, a parallel three-stage cycloid external gear (2), an eccentric shaft (3) with a balance block, and a plurality of bearings, bearing seats (6), end covers (5), gaskets and the like which are necessary to match. The single-stage needle gear is respectively a single-stage needle gear (1-1), (1-2) and (1-3), wherein 3 single-stage needle gears are coaxially assembled and meshed with the parallel three-stage cycloid external gear (2) through a needle (7), a reference shaft of the eccentric shaft (3) is also coaxial with the 3 single-stage needle gears, the parallel three-stage cycloid external gear (2) is coaxial with an eccentric part of the eccentric shaft (3), and a balance block (4) is arranged on the eccentric shaft. According to a specific structural design, all the parts are assembled according to requirements, so that gears at all levels on the parallel three-level cycloid external gear (2) correspond to and are meshed with gear pins (7) of a single-level needle gear one by one, a bearing used for supporting rotation and reducing friction is arranged between every two gears, and a bearing seat (6) used for supporting and fixing the bearing is further arranged on one side of the bearing. In the running process of the mechanism, the parallel three-stage cycloid external gear (2) is driven by the eccentric shaft (3) to revolve and rotate by taking the eccentric shaft reference shaft as the center. At the moment, the eccentric shaft (3) is used as input to fix a single-stage gear, when the number of teeth of the non-fixed single-stage gear is the same as that of the fixed single-stage gear, the rotating speed of the single-stage gear is zero as that of the fixed single-stage gear, and when the number of teeth of the non-fixed single-stage gear is different from that of the fixed single-stage gear, the non-fixed single-stage gear has the rotating speed, the rotating speed depends on the difference of the number of teeth, the smaller the difference of the number of teeth is, the smaller the output rotating speed is, the larger the reduction ratio is. Therefore, as long as the tooth number of the single-stage gear is designed to be close to the fixed tooth number of the single-stage gear, the ultra-large reduction ratio can be realized in a limited space;

example 3

The utility model discloses example 3 refers to fig. 4, and this embodiment is a parallel two-stage cycloid external gear, including two single-stage cycloid external gears, wherein, the end faces of the two single-stage cycloid external gears coincide, and the gear tooth profile schematic diagram of the cycloid external gear is shown in fig. 1 a;

example 4

The utility model discloses example 4 refers to fig. 6, this embodiment is the combination of two-stage cycloid external gears plus one-stage cycloid internal gear, including two single-stage cycloid external gears and one single-stage cycloid internal gear, wherein the terminal surfaces of three single-stage cycloid gears coincide, the profile schematic diagram of one single-stage cycloid internal gear is shown in fig. 1b, and the profile of cycloid internal gear can also carry out corresponding deformation, as shown in fig. 3a and fig. 3b, specifically can also refer to embodiment 2 and carry out the flexible application, as long as can constitute corresponding reduction gears, this is that the technical staff in the art understands and changes very easily, and the description is omitted here;

example 5

The utility model discloses example 5 refers to fig. 7, and this embodiment is parallelly connected four-stage pin gear, including four single-stage pin gear external gears, the profile schematic diagram of single-stage cycloid external gear is shown in fig. 2, and it can be flexibly applied with reference to embodiment 2 in particular, as long as can constitute corresponding reduction gears, this is that those skilled in the art can understand and transform easily, and the description is omitted here;

example 6

The utility model discloses example 6 refers to fig. 8, and this embodiment is parallelly connected two-stage gear, including one-level cycloid external gear and one-level pin gear, specifically can also carry out the nimble application with embodiment 2, as long as can constitute corresponding reduction gears, this is that the very easy understanding of skilled in the art and transform, and the no longer redundant description here.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (8)

1. A parallel multi-stage gear, characterized in that: the number of stages is n, the gear tooth profile is cycloid teeth or needle teeth, the end faces of two adjacent stages of gears are overlapped or have a certain distance, the cycloid teeth are cycloid internal teeth or cycloid external teeth, and the tooth heights of the cycloid teeth are equal.

2. A parallel multi-stage gear according to claim 1, wherein: the gear is made by integral molding or assembled and molded by a plurality of gears with the number of stages less than n.

3. A parallel multi-stage gear according to claim 2, wherein: the assembly mode of the assembly molding is as follows: one or more of pins, screws and welding.

4. A parallel multi-stage gear according to claim 1, wherein: and n is an integer not less than 2.

5. A parallel multi-stage gear according to claim 1, wherein: the needle tooth forming mode is integrated processing forming or forming by inserting a needle pin into the gear female seat.

6. A parallel multi-stage gear according to claim 5, wherein: the integrally processed and formed pin gear is a gear which is still pin gear after fillet deformation treatment.

7. A multi-cycloid differential speed reducing mechanism comprises n single-stage gears, bearings and an eccentric shaft device, and is characterized in that: further comprising a parallel multi-stage gear according to claims 1-6 meshed with a single stage gear.

8. The multiple cycloid differential reduction mechanism of claim 7, wherein: the eccentric shaft device comprises an eccentric shaft and an eccentric shaft balance block arranged on the circumference of the eccentric shaft.

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