CN218582190U

CN218582190U - Cycloidal gear, meshing system and RV speed reducer

Info

Publication number: CN218582190U
Application number: CN202120954964.5U
Authority: CN
Inventors: 万方辉; 傅学刚; 金乾进; 谭利彬; 陈玉山; 于永慧
Original assignee: Nanjing Nanchuan Intelligent Technology Co ltd
Current assignee: Nanjing Nanchuan Intelligent Technology Co ltd
Priority date: 2020-12-08
Filing date: 2021-05-06
Publication date: 2023-03-07
Anticipated expiration: 2031-05-06
Also published as: CN113062964A

Abstract

The utility model provides a pair of cycloid wheel, meshing system and RV speed reducer relates to speed reducer technical field to optimize the structure of cycloid wheel to a certain extent, the edge stress when making cycloid wheel and the meshing of pin tooth is more even. The utility model provides a cycloidal gear, which comprises a cycloidal gear main body, a first tooth part and a connecting hole; the connecting hole is formed in the center of the cycloidal gear main body along the axial direction of the cycloidal gear main body; the number of the first tooth parts is multiple, and the multiple first tooth parts are arranged along the circumferential direction of the cycloid wheel main body; the center area of the first tooth part in the first direction protrudes out of the edges of two sides of the first tooth part in the first direction, so that the first tooth part forms a drum-shaped structure; the first direction is the axis direction of the cycloid wheel main body. Through the drum-shaped structure that makes first tooth portion form, when the cycloid wheel main part rotates, can make first tooth portion contact with the pin tooth gradually to the marginal stress that makes first tooth portion receive is more even, and then promotes RV speed reducer's motion stationarity.

Description

Cycloidal gear, meshing system and RV speed reducer

Technical Field

The utility model belongs to the technical field of the speed reducer technique and specifically relates to a cycloid wheel, meshing system and RV speed reducer are related to.

Background

The RV reducer has the advantages of high transmission precision, large transmission ratio, high bearing capacity, high efficiency, low return difference, long service life and the like, so that the RV reducer is widely applied to the fields of industrial robots, aerospace, automation equipment and the like. The RV reducer has numerous structural parameters and complex constraint conditions, and certain difficulty is caused for the structural design of the RV reducer, so that the research on the structural optimization design method of the RV reducer has important significance for improving the overall performance of the RV reducer.

Along with the development of industrial robot, put forward more and more high requirement to RV reduction gear's transmission precision and life, current cycloid wheel is as the key part in the RV reduction gear, can not guarantee that the RV reduction gear produces comparatively even edge stress when actual operation in-process, cycloid wheel and pin gear meshing.

Therefore, it is desirable to provide a cycloid gear, a meshing system and an RV reducer to solve the problems of the prior art to some extent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cycloid wheel, meshing system and RV speed reducer to optimize the structure of cycloid wheel to a certain extent, the edge stress when making cycloid wheel and the meshing of pin tooth is more even.

The utility model provides a cycloidal gear, which comprises a cycloidal gear main body, a first tooth part and a connecting hole; the connecting hole is formed in the center of the main body of the cycloidal gear along the axial direction of the main body of the cycloidal gear; the number of the first tooth parts is multiple, and the multiple first tooth parts are arranged along the circumferential direction of the cycloid wheel main body; the center area of the first tooth part in the first direction protrudes out of the edges of two sides of the first tooth part in the first direction, so that the first tooth part forms a drum-shaped structure; the first direction is an axis direction of the cycloid wheel main body.

The main body of the cycloid wheel is also provided with a plurality of process holes, and the plurality of process holes are arranged at intervals along the circumferential direction of the connecting hole.

Compared with the prior art, the utility model provides a cycloid wheel has following advantage:

the utility model provides a cycloidal gear, which comprises a cycloidal gear main body, a first tooth part and a connecting hole; the connecting hole is arranged in the center of the main body of the cycloidal gear along the axial direction of the main body of the cycloidal gear; the number of the first tooth parts is multiple, and the multiple first tooth parts are arranged along the circumferential direction of the cycloid wheel main body; the center area of the first tooth part in the first direction protrudes out of the edges of two sides of the first tooth part in the first direction, so that the first tooth part forms a drum-shaped structure; the first direction is the axis direction of the cycloid wheel main body.

From this analysis, it is found that the center region of the first tooth portion in the first direction on the cycloid wheel main body is protruded from the edges of the first tooth portion on both sides in the first direction, so that the first tooth portion is formed into a drum-like structure.

When the cycloid wheel main part rotates, and the pin tooth meshes with first tooth portion mutually, because the central zone protrusion in both sides of first tooth portion, consequently, the stress that receives is greater than the stress of both sides to, because first tooth portion is drum column structure in this application, consequently, the stress that first tooth portion received reduces to the edge by the highest point gradually, thereby makes the marginal stress that first tooth portion received more even, and then can promote integrated device pivoted stability to a certain extent.

In addition, the utility model also provides an engagement system, which comprises the cycloid wheel and the pin gear shell; the cycloidal gears comprise a first cycloidal gear and a second cycloidal gear, a first tooth part of the first cycloidal gear and a first tooth part of the second cycloidal gear are arranged in a staggered manner, and the first cycloidal gear and the second cycloidal gear are arranged in parallel along the first direction; the pin gear shell is internally provided with a plurality of pin gears which are of a cylindrical structure, the plurality of pin gears extend along the first direction and are circumferentially arranged along the pin gear shell, so that the first tooth part of the first cycloid gear and the first tooth part of the second cycloid gear are meshed with the pin gears.

Wherein the phase difference of the two cycloid wheels is 180 degrees.

Specifically, the first tooth portion of the first cycloid wheel is the same as the first tooth portion of the second cycloid wheel, and the number of the pin teeth is greater than the number of the first tooth portions of the first cycloid wheel and the second tooth portions of the second cycloid wheel.

Adopt the engagement system of this application provides, the stress distribution that can make the meshing department of the interior pin tooth of pin tooth shell and first tooth portion is more even to the marginal stress that receives when can reduce the meshing of first tooth portion to a certain extent makes pin tooth shell pivoted more steady.

The application also provides an RV reducer, which comprises the meshing system, an input shaft, a main gear, a crank shaft and an output mechanism; one end of the input shaft is meshed with the main gear, the main gear is connected with the crankshaft, and the first cycloidal gear and the second cycloidal gear are arranged on the crankshaft along the axial direction of the crankshaft; the output mechanism is connected with the first cycloidal gear and the second cycloidal gear.

Wherein, one end of the input shaft is formed with a second tooth part, and the main gear is meshed with the second tooth part of the input shaft; one end of the crank shaft is connected with the main gear, a needle bearing is sleeved on the crank shaft, and the needle bearing is arranged corresponding to the first cycloidal gear and the second cycloidal gear.

Specifically, the main gears include a first main gear and a second main gear, which are disposed at lateral sides of the second teeth; the crankshafts and the main gears are arranged in a one-to-one correspondence.

Further, the output mechanism comprises an output shaft, a flange and a bearing; the bearing with the output shaft with the flange one-to-one sets up, the flange passes through the bearing cap is located first cycloid wheel deviates from one side of pin wheel housing, the output shaft passes through the bearing cap is located second cycloid wheel deviates from one side of pin wheel housing.

Further, the utility model provides a RV speed reducer still includes the oil blanket, the oil blanket set up in the output shaft with between the pin gear shell.

Adopt the RV speed reducer of meshing system that this application provided, because the edge stress that the cycloid wheel in the meshing system received is more even, consequently, make holistic meshing system can be more steady to make the RV speed reducer can move more steadily.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an overall structural schematic diagram of a first view angle of a cycloid wheel provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second view angle of the cycloid wheel provided in the embodiment of the present invention;

fig. 3 is a schematic diagram of a stress curve applied to the first tooth portion of the cycloid wheel main body according to the embodiment of the present invention;

fig. 4 is an exploded view of an RV reducer provided by an embodiment of the present invention.

In the figure: 1-a cycloid wheel main body; 101-a first tooth; 102-connecting hole; 103-fabrication holes; 2-a first cycloid wheel; 3-a second cycloid wheel; 4-a needle gear shell; 401-needle teeth; 5-an input shaft; 501-second teeth; 6-a first main gear; 7-a second main gear; 8-crankshaft; 801-needle roller bearings; 9-a flange; 10-an output shaft; 11-angular contact ball bearings; 12-oil sealing; 13-circlip for hole;

s1-first direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "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.

As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more of the items.

For ease of description, spatial relationship terms such as "above 8230; …," upper "," above 8230; \8230;, "below" and "lower" may be used herein to describe the relationship of one element to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Fig. 1 is an overall structural schematic diagram of a first view angle of a cycloid wheel provided in an embodiment of the present invention; fig. 2 is a schematic structural diagram of a second view angle of the cycloid wheel provided in the embodiment of the present invention; fig. 3 is a schematic diagram of a stress curve received by the first tooth portion of the cycloid wheel main body according to the embodiment of the present invention.

As shown in fig. 1 to 3, the present invention provides a cycloid wheel, which includes a cycloid wheel main body 1, a first tooth portion 101 and a connecting hole 102; the connecting hole 102 is arranged in the center of the cycloid wheel main body 1 along the axial direction of the cycloid wheel main body 1; the number of the first teeth 101 is plural, and the plural first teeth 101 are arranged along the circumferential direction of the cycloid wheel main body 1; a central region of the first tooth portion 101 in the first direction S1 protrudes beyond edges of both sides of the first tooth portion 101 in the first direction S1, so that the first tooth portion 101 forms a drum-like structure.

the utility model provides a cycloid wheel through the edge that makes first tooth portion 101 on the cycloid wheel main part 1 central zone on first direction S1 protrusion in the both sides of first tooth portion 101 on first direction S1 to make first tooth portion 101 form the drum-shaped structure.

When cycloid wheel main part 1 rotates, and when pin tooth 401 and first tooth portion 101 engaged with, because the central zone protrusion in both sides of first tooth portion 101, consequently, the stress that receives is greater than the stress of both sides to, because first tooth portion 101 is drum structure in this application, consequently, the stress that first tooth portion 101 received reduces to the edge by the highest point gradually, thereby makes the marginal stress that first tooth portion 101 received more even, and then can promote the overall device pivoted stability to a certain extent.

The first direction S1 in the present application is the axial direction of the cycloid wheel, i.e., the middle region in the axial direction of the cycloid wheel main body 1 protrudes beyond the edges on both sides in the axial direction of the cycloid wheel main body 1, so that the entire first tooth 101 forms a drum-shaped structure. As shown in fig. 3, the stress distribution from the edge of the first tooth portion 101 to the highest point is an even arc curve, that is, when the pin teeth 401 are engaged with the first tooth portion 101, the stress applied to the edge of the first tooth portion 101 is small, and the stress applied to the whole first tooth portion 101 can be changed uniformly, so that the running stability of the whole RV reducer is ensured.

Because the length of the needle teeth 401 is greater than the thickness of the cycloid wheel main body 1 in the application, when the needle teeth 401 are meshed with the cycloid wheel main body 1, certain depression is generated at the end part of the needle teeth 401 which is not connected with the cycloid wheel main body 1, so that the integral needle teeth 401 are in a stretching state, the pressure stress of the two ends of the cycloid wheel main body 1 in the tooth direction is higher than the stress of the contact center, and the edge of the cycloid wheel main body 1 is loaded. To counteract this state, the first tooth 101 of the cycloid wheel main body 1 in the present application is made drum-shaped, so that the stress distribution at the meshing becomes more uniform.

It should be noted that, in the present application, the first tooth portion 101 protrudes from the edge at the middle position in the axis direction by the trimming of the first tooth portion 101, and preferably, the trimming amount of the first tooth portion 101 in the first direction S1 in the present application is 0 to 0.1mm, which can avoid the problems that the contact surface is too small when the cycloid wheel main body 1 is meshed with the pin teeth 401, and the stress concentration is easily generated at the contact point, thereby ensuring the motion accuracy of the cycloid wheel main body 1 to a certain extent and improving the motion stability of the whole RV reducer.

As shown in fig. 1 and fig. 3, a plurality of process holes 103 are further formed in the cycloid wheel main body 1, and the plurality of process holes 103 are arranged at intervals in the circumferential direction of the connecting hole 102.

Set up a plurality of fabrication holes 103 on cycloid wheel main part 1, and a plurality of fabrication holes 103 set up along the circumference interval of connecting hole 102, can reduce the weight of whole cycloid wheel main part 1 on the one hand to, the fabrication hole 103 of seting up can make cycloid wheel main part 1 can be more steady when rotating, and on the other hand, also can be convenient for the installation of structure in the RV speed reducer.

It should be added here that, preferably, the number of the process holes 103 in the present application is eight, and the process holes are arranged at intervals in the circumferential direction of the cycloid wheel main body 1.

As shown in fig. 1-3, the present application also provides a meshing system comprising the above-described cycloid gear and the pin gear housing 4; the cycloidal gear comprises a first cycloidal gear 2 and a second cycloidal gear 3, wherein a first tooth part 101 of the first cycloidal gear 2 and a first tooth part 101 of the second cycloidal gear 3 are arranged in a staggered manner; a plurality of needle teeth 401 in a cylindrical structure are arranged in the needle gear shell 4, the plurality of needle teeth 401 extend along the first direction S1 and are arranged along the circumferential direction of the needle gear shell 4, so that the first tooth part 101 of the cycloid gear is meshed with the needle teeth 401.

Adopt the meshing system of this application provides, the stress distribution that can make the meshing department of the pin tooth 401 in the pin gear shell 4 and first tooth portion 101 is more even to the marginal stress that receives when can reduce the meshing of first tooth portion 101 to a certain extent makes the pin gear shell 4 pivoted more steady.

Preferably, the pin teeth 401 in the present application are cylindrical structures, so that the contact areas of the pin teeth 401 when engaging with the first tooth portion 101 of the first cycloid gear 2 and the first tooth portion 101 of the second cycloid gear 3 are the same, thereby being capable of improving the stability of the pin tooth housing 4 to some extent.

Wherein the phase difference of the two cycloidal gears is 180 deg., as shown in fig. 1-3.

Preferably, the phase difference of two cycloid wheels in this application is 180 °, on the one hand, can make the cycloid wheel obtain static balance, improves the stability of complete machine, on the other hand, can still improve bearing capacity.

Specifically, as shown in fig. 1 to 3, the number of the pin teeth 401 is larger than the number of the first teeth 101.

Preferably, the number of teeth of the first and second cycloidal gears 2, 3 in this application is 39, and the number of needle teeth 401 provided in the needle housing 4 is 40.

Fig. 4 is an exploded view of the RV reducer provided by the embodiment of the present invention.

As shown in fig. 1-4, the present invention further provides an RV reducer, which comprises the above-mentioned engagement system, an input shaft 5, a main gear, a crank shaft 8, and an output mechanism; one end of the input shaft 5 is meshed with a main gear, the main gear is connected with a crankshaft 8, and the first cycloidal gear 2 and the second cycloidal gear 3 are arranged on the crankshaft 8 along the axial direction of the crankshaft 8; the output mechanism is connected with the first cycloid gear 2 and the second cycloid gear 3.

When the device is installed, one end of the input shaft 5 sequentially penetrates through the output mechanism, the first cycloidal gear 2, the needle gear shell 4 and the second cycloidal gear 3 to be meshed with the main gear, one end of the crankshaft 8 is connected with the center hole of the main gear, and when the input shaft 5 rotates, the main gear can be driven to rotate, so that the crankshaft 8 can rotate, and the first cycloidal gear 2 and the second cycloidal gear 3 arranged on the crankshaft 8 are driven.

Since the first and second cycloidal gears 2 and 3 are engaged with the needle teeth 401 in the needle housing 4, the first and second cycloidal gears 2 and 3 can rotate when the needle housing 4 is fixed, and since the output mechanism is connected to the first and second cycloidal gears 2 and 3, the output mechanism can rotate with respect to the needle housing 4 following the first and second cycloidal gears 2 and 3.

When the pin gear housing 4 rotates following the rotation of the first and second cycloidal gears 2 and 3, the output mechanism follows the first and second cycloidal gears 2 and 3 to make a circular motion, and no rotation action is generated.

As shown in fig. 1 to 4, a second tooth portion 501 is formed at one end of the input shaft 5, and the main gear is engaged with the second tooth portion 501 of the input shaft 5; one end of the crankshaft 8 is connected with the main gear, a needle bearing 801 is sleeved on the crankshaft 8, and the needle bearing 801 is arranged corresponding to the first cycloidal gear 2 and the second cycloidal gear 3.

When the crankshaft is installed, one end of the second tooth portion 501 of the input shaft 5 passes through the connecting hole 102 of the cycloid gear and is engaged with the main gear, one end of the crankshaft 8 is connected with the central hole of the main gear, and when the input shaft 5 rotates, the main gear can be driven to rotate, so that the crankshaft 8 connected with the main gear rotates.

The crankshaft 8 passes through the fabrication holes 103 of the first cycloidal gear 2 and the second cycloidal gear 3, so that the first cycloidal gear 2 and the second cycloidal gear 3 are arranged on the crankshaft 8, when the crankshaft 8 rotates, the first cycloidal gear 2 and the second cycloidal gear 3 are driven to do circular motion, and when the pin gear shell 4 is fixed, the circular motion of the first cycloidal gear 2 and the second cycloidal gear 3 generates rotation under the action of the pin gear shell 4, so that the output mechanism is driven to rotate.

It should be added here that the crank shaft 8 in the present application has two eccentric connecting shaft portions, the needle bearings 801 are sleeved on the connecting shaft portions, and the first cycloid gear 2 and the second cycloid gear 3 are respectively mounted on the corresponding connecting shaft portions through the needle bearings 801.

Preferably, the number of teeth of the input shaft 5 is 12 teeth in the present application, and the number of the main gear is 42 teeth, so that when the input shaft 5 rotates for 3.5 turns, the main gear rotates for one turn, and since the number of teeth of the first and second cycloidal gears 2 and 3 in the present application is 39, the number of the needle teeth 401 is 40, when the main gear rotates for one turn, the crank shaft 8 rotates for one turn, so as to drive the first and second cycloidal gears 2 and 3 to make one complete circular motion, so that the needle gear housing 4 engaged with the first and second cycloidal gears 2 and 3 rotates for one tooth, and the purpose of speed reduction is achieved.

The above-mentioned solution is only one embodiment of the present application, and other numbers of teeth for achieving the speed reduction purpose can be adopted for the input shaft 5, the main gear, the cycloidal gear and the needle teeth 401.

Specifically, as shown in fig. 1 to 4, the main gear includes a first main gear 6 and a second main gear 7, the first main gear 6 and the second main gear 7 being disposed at sides of the second teeth 501; the crank shafts 8 are provided in one-to-one correspondence with the main gear.

The present application includes two main gears, and therefore, correspondingly has two crank shafts 8, and since the crank shafts 8 are connected with the first and second cycloidal gears 2 and 3, providing two crank shafts 8 enables the first and second cycloidal gears 2 and 3 to perform a circular motion more stably.

Further, as shown in fig. 1-4, the output mechanism of the RV reducer provided by the present application includes an output shaft 10, a flange 9 and a bearing; the bearing sets up with output shaft 10 and flange 9 one-to-one, and flange 9 locates one side that first cycloidal gear 2 deviates from needle gear shell 4 through the bearing cap, and output shaft 10 locates one side that second cycloidal gear 3 deviates from needle gear shell 4 through the bearing cap.

Because the quantity of the fabrication holes 103 on the cycloid wheel main body 1 in this application is 8, and the crank axle 8 passes two relative fabrication holes 103, consequently, offer the first spliced eye that corresponds with the fabrication hole 103 one-to-one on the cycloid wheel main body 1 on the flange 9 in this application, be formed with two second spliced eyes corresponding with crank axle 8 and the grafting portion corresponding with other 6 fabrication holes 103 on the output shaft 10, and flange 9 and the center of output shaft 10 all offer with the connecting hole 102 be located the locating hole on the same axis.

When the input shaft 5 is mounted, the second tooth portion 501 of the input shaft passes through the positioning hole of the flange 9, the connecting hole 102 of the first cycloidal gear 2, the connecting hole 102 of the second cycloidal gear 3 and the positioning hole of the output shaft 10 in sequence, and is meshed with the first main gear 6 and the second main gear 7.

The crank shaft 8 passes through two opposite first plug holes of the flange 9, the fabrication hole 103 of the first cycloidal gear 2, the fabrication hole 103 of the second cycloidal gear 3 and the second plug hole on the output shaft 10 in sequence and is connected with the central hole of the main gear.

The insertion part of the output shaft 10 passes through the fabrication hole 103 of the second cycloid gear 3, the fabrication hole 103 of the first cycloid gear 2 and the first insertion hole of the flange 9 in sequence, thereby completing the assembly of the entire mechanism.

It should be added here that the bearing in the present application is an angular ball bearing 11, and the flange 9 and the output shaft 10 are covered on both sides of the pin gear case 4 by the angular ball bearing 11, so that the first main gear 6, the second main gear 7, the first cycloidal gear 2, the second cycloidal gear 3, and the crank shaft 8 can be stably rotated, and when the pin gear case 4 is fixed, the flange 9 and the output shaft 10 can be rotated relative to the pin gear case 4.

Furthermore, as shown in fig. 1-4, the RV reducer provided by the present invention further includes an oil seal 12, and the oil seal 12 is disposed between the output shaft 10 and the pin gear housing 4.

Through the oil blanket 12 of establishing of cover between output shaft 10 and pin gear shell 4, can guarantee the inside sealed effect of whole RV speed reducer to a certain extent, avoid the seepage of lubricating oil.

It should be added here that, in the present application, the crankshaft 8 is provided with a circlip for hole 13 at one end of the flange 9, which can further ensure the stability of installation.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cycloidal gear is characterized by comprising a cycloidal gear main body, a first tooth part and a connecting hole;

the connecting hole is formed in the center of the main body of the cycloidal gear along the axial direction of the main body of the cycloidal gear;

the number of the first tooth parts is multiple, and the multiple first tooth parts are arranged along the circumferential direction of the cycloid wheel main body;

the central region of the first tooth part in the first direction protrudes out of the edges of the two sides of the first tooth part in the first direction, so that the first tooth part forms a drum-shaped structure;

the first direction is an axis direction of the cycloid wheel main body.

2. The cycloidal gear of claim 1 wherein the cycloidal gear body further defines a plurality of tooling holes, the plurality of tooling holes being spaced circumferentially along the attachment hole.

3. An engagement system comprising the cycloid gear according to claim 1 or 2 and a pin gear housing;

the cycloidal gears comprise a first cycloidal gear and a second cycloidal gear, a first tooth part of the first cycloidal gear and a first tooth part of the second cycloidal gear are arranged in a staggered manner, and the first cycloidal gear and the second cycloidal gear are arranged in parallel along the first direction;

the pin gear shell is internally provided with a plurality of pin gears which are of a cylindrical structure, the plurality of pin gears extend along the first direction and are circumferentially arranged along the pin gear shell, so that the first tooth part of the first cycloid gear and the first tooth part of the second cycloid gear are meshed with the pin gears.

4. The engagement system according to claim 3, wherein the phase difference of the two cycloidal gears is 180 °.

5. The meshing system according to claim 3, wherein the first tooth portion of the first cycloid gear is the same as the first tooth portion of the second cycloid gear, and the number of pin teeth is larger than the number of the first tooth portions of the first cycloid gear and the second tooth portion of the second cycloid gear.

6. An RV reducer characterized by comprising the meshing system of any of the above claims 3-5, an input shaft, a main gear, a crank shaft, and an output mechanism;

one end of the input shaft is meshed with the main gear, the main gear is connected with the crankshaft, and the first cycloidal gear and the second cycloidal gear are arranged on the crankshaft along the axial direction of the crankshaft;

the output mechanism is connected with the first cycloidal gear and the second cycloidal gear.

7. The RV reducer of claim 6 wherein one end of said input shaft is formed with a second tooth portion, said primary gear meshing with said second tooth portion of said input shaft;

one end of the crank shaft is connected with the main gear, a needle bearing is sleeved on the crank shaft, and the needle bearing is arranged corresponding to the first cycloidal gear and the second cycloidal gear.

8. The RV reducer of claim 7, wherein said primary gears comprise a first primary gear and a second primary gear, said first primary gear and said second primary gear disposed on sides of said second teeth;

the crankshafts and the main gears are arranged in a one-to-one correspondence.

9. The RV reducer of claim 7, wherein said output mechanism comprises an output shaft, a flange, and a bearing;

the bearing with the output shaft with the flange one-to-one sets up, the flange passes through the bearing cap is located first cycloid wheel deviates from one side of pin wheel housing, the output shaft passes through the bearing cap is located second cycloid wheel deviates from one side of pin wheel housing.

10. The RV reducer of claim 9, further comprising an oil seal disposed between the output shaft and the pin gear housing.