CN109944932B

CN109944932B - Shaft coupling system and planetary wheel system

Info

Publication number: CN109944932B
Application number: CN201910215381.8A
Authority: CN
Inventors: 赵建华; 相涯; 陈国强
Original assignee: Hunan Aviation Powerplant Research Institute AECC
Current assignee: Hunan Aviation Powerplant Research Institute AECC
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-09-08
Anticipated expiration: 2039-03-20
Also published as: CN109944932A

Abstract

The invention relates to the technical field of planetary gear trains, and provides a shaft connecting system and a planetary gear system. The drive shaft includes a cavity extending axially therealong; the flexible shaft comprises a positioning part and a first connecting part, and the positioning part is connected in the cavity of the transmission shaft in an interference manner; the rotating member is connected with the first connecting portion through a spline. The rotating part in the shaft connecting system can move in the axial direction and the radial direction, so that the load balancing effect of the rotating part is realized. In addition, the shaft connecting system occupies small space and has wide application range.

Description

Shaft coupling system and planetary wheel system

Technical Field

The invention relates to the technical field of planetary gear trains, in particular to a shaft coupling system and a planetary gear system.

Background

The shaft coupling system generally includes a drive shaft and a rotating member that is rotatable about the drive shaft. The shaft coupling system has applications in various technical fields, for example, the shaft coupling system can be applied to a planetary wheel system for realizing the rotation of a planetary wheel and a sun wheel around a shaft. In a shaft coupling system, a rotating member and a transmission shaft are generally required to be in floating connection, so that load balance of the rotating member is realized. For example, in a planetary gear train, if a transmission shaft is in floating connection with a sun wheel, an automatic compensation space is formed between the sun wheel and other planet wheels, so that the load is evenly shared by the planet wheels.

In the related art, the shaft coupling system is usually splined to the transmission shaft and the rotary member respectively through a spline housing having an inner spline pair and an outer spline pair, the inner spline pair being splined to the transmission shaft, and the outer spline pair being splined to the rotary member. The shaft connecting system can realize the axial and radial movement of the rotating member relative to the transmission shaft through the spline housing.

However, the design requirement of the spline housing is high, and the internal spline pair and the external spline pair of the spline housing are limited by torque and need to have a certain size, so that the shaft coupling system is large in size and cannot be applied to a system with a small accommodating space.

It is to be noted that the information invented in the above background section is only for enhancing the understanding of the background of the present invention, and therefore, may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a shaft connecting system and a planetary wheel system. The shaft connecting system can solve the technical problem that the shaft connecting system in the related technology occupies a large space.

Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.

According to one aspect of the present invention, a shaft coupling system is provided that includes a drive shaft, a flexible shaft, and a rotating member. The drive shaft includes a cavity extending axially therealong; the flexible shaft comprises a positioning part and a first connecting part, and the positioning part is connected in the cavity of the transmission shaft in an interference manner; the rotating member is connected with the first connecting portion through a spline.

In an exemplary embodiment of the invention, the shaft coupling system further comprises a locating pin. The positioning pin is connected between the transmission shaft and the positioning part of the flexible shaft along the radial direction of the transmission shaft.

In an exemplary embodiment of the present invention, one end of the transmission shaft close to the rotating member is supported by a support bearing, and the positioning portion is located at a position corresponding to the support bearing.

In an exemplary embodiment of the invention, the flexible shaft further includes a second connecting portion. The second connecting portion is located one side of the positioning portion, which is far away from the first connecting portion, and the second connecting portion is in splined connection with the cavity of the transmission shaft.

In an exemplary embodiment of the invention, a blocking portion is arranged on a side surface of the rotating member facing the transmission shaft, the blocking portion has a blocking surface facing the rotating member, and the shaft connection system further comprises a limiting assembly. The limiting assembly is fixed on the flexible shaft and positioned between the transmission shaft and the rotating part, and comprises a limiting part extending to the blocking surface; the limiting part is matched with the blocking surface and used for blocking the rotary part to move towards one side far away from the transmission shaft.

In an exemplary embodiment of the present invention, a space for accommodating the axial movement of the limiting portion along the transmission shaft is provided between the blocking surface and the rotating member.

In an exemplary embodiment of the invention, the limiting assembly is screwed to the flexible shaft.

In an exemplary embodiment of the invention, the rotating member is a sun gear.

In an exemplary embodiment of the invention, the rotating member is a planetary gear.

According to one aspect of the invention, a planetary wheel system is provided, which comprises the shaft coupling system described above.

The invention provides a shaft connection system and a planetary wheel system. The shaft connecting system comprises a transmission shaft, a flexible shaft and a rotating piece. The drive shaft includes a cavity extending axially therealong; the flexible shaft comprises a positioning part and a first connecting part, and the positioning part is connected in the cavity of the transmission shaft in an interference manner; the rotating member is connected with the first connecting portion through a spline. On one hand, the rotating part in the shaft connecting system can move in the axial direction and the radial direction, so that the load balancing effect of the rotating part is realized; on the other hand, the shaft connecting system occupies small space and has wide application range.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic structural view of a shaft coupling system according to the related art;

FIG. 2 is a schematic structural diagram of an exemplary embodiment of a shaft coupling system of the present disclosure;

FIG. 3 is a schematic structural view of another exemplary embodiment of a shaft coupling system according to the present disclosure;

FIG. 4 is a schematic structural diagram of another exemplary embodiment of a shaft coupling system according to the present disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "high," "low," "top," "bottom," "left," "right," and the like are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," and the like are used to denote the presence of one or more elements/components/parts; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

Fig. 1 is a schematic structural diagram of a shaft coupling system in the related art. The shaft coupling system comprises a transmission shaft 1, a rotary member 2 and a spline housing 3, wherein the transmission shaft 1 is supported by a bearing 4. The spline housing 3 is respectively connected with the transmission shaft 1 and the rotary piece 2 in a rotary mode. In the related art, the shaft coupling system is usually splined to the drive shaft and the rotary member, respectively, via a spline housing. However, the design requirement of the spline housing 3 is high, and the internal spline pair and the external spline pair of the spline housing 3 are limited by torque and need to have a certain size, so that the shaft coupling system has a large volume and cannot be applied to a system with a small accommodating space.

In view of this, the present exemplary embodiment provides a shaft coupling system, as shown in fig. 2, which is a schematic structural diagram of an exemplary embodiment of the shaft coupling system of the present disclosure. The shaft connecting system comprises a transmission shaft 5, a flexible shaft 6 and a rotating member 7. The drive shaft 5 comprises a cavity extending axially along it; the flexible shaft 6 comprises a positioning part 61 and a first connecting part 62, and the positioning part 61 is connected in the cavity of the transmission shaft 5 in an interference manner; the rotary member 7 is spline-connected to the first connecting portion 62. The outer diameter of the flexible shaft 6 except the positioning portion 61 is smaller than the inner diameter of the transmission shaft 5, and radial flexibility can be generated in the cavity of the transmission shaft 5.

The present exemplary embodiment provides a shaft coupling system. The shaft connecting system comprises a transmission shaft, a flexible shaft and a rotating piece. The drive shaft includes a cavity extending axially therealong; the flexible shaft comprises a positioning part and a first connecting part, and the positioning part is connected in the cavity of the transmission shaft in an interference manner; the rotating member is connected with the first connecting portion through a spline. On one hand, the rotating part in the shaft connecting system can axially move relative to the first connecting part, and meanwhile, the rotating part can radially move by utilizing the disturbance of the flexible shaft, so that the load balancing effect of the rotating part can be realized; on the other hand, the shaft connecting system does not need to be provided with a spline sleeve, and the flexible shaft is arranged inside the transmission shaft, so that the occupied space is reduced.

In the present exemplary embodiment, the positioning portion 61 may be interference-connected in the cavity of the transmission shaft 5. When the rotating member floats in the radial direction, the positioning portion 61 is deformed, so that the flexible shaft 6 is radially deformed with the positioning portion 61 as a fulcrum. Therefore, by adjusting the flexibility of the flexible shaft 6 and the interference connection degree of the positioning part 61 and the transmission shaft 5, the radial floating amount of the rotating member can be adjusted.

In the exemplary embodiment, to prevent the flexible shaft 6 from rotating relative to the transmission shaft 5, as shown in fig. 3, a schematic structural diagram of another exemplary embodiment of the shaft coupling system of the present disclosure is shown. The shaft coupling system may also include a locating pin 8. The positioning pin 8 may be connected between the transmission shaft and the positioning portion of the flexible shaft in the radial direction of the transmission shaft so as to prevent the flexible shaft 6 from rotating with respect to the transmission shaft 5.

In the exemplary embodiment, when the rotary member 7 is subjected to a radial force, the radial force is transmitted to the hollow transmission shaft 5 through the positioning portion 61, and the radial force may cause some damage to the outer wall of the transmission shaft 5. As shown in fig. 2 and 3, one end of the transmission shaft near the rotating member may be supported by a support bearing 11, the positioning portion 61 may be located at a position corresponding to the support bearing 11, and when the positioning portion 61 generates a radial force on the transmission shaft 5, the support bearing may generate a support force on the transmission shaft in a direction opposite to the radial force, so as to prevent the rotation shaft 5 from being damaged.

In the exemplary embodiment, as shown in fig. 4, a schematic structural diagram of another exemplary embodiment of the shaft coupling system of the present disclosure is shown. The flexible shaft 6 may further include a second connection portion 63. The second connecting portion 63 is located on a side of the positioning portion 61 away from the first connecting portion 62, and the second connecting portion 63 is splined in the cavity of the transmission shaft 5. The floating amount of the swivel member can be further adjusted by adjusting the gap between the second connecting portion 63 and the transmission shaft 5.

In the exemplary embodiment, as shown in fig. 4, a side of the rotating member 7 facing the transmission shaft 5 may be provided with a blocking portion, the blocking portion has a blocking surface 9 facing the rotating member 7, and the shaft coupling system further includes a limiting component 10. The limiting assembly 10 is fixed on the flexible shaft 6 and located between the transmission shaft 5 and the rotating part 7, and the limiting assembly 10 comprises a limiting part 101 extending to the blocking surface; the limiting part 101 is matched with the blocking surface 9 and used for blocking the rotary part 7 to move towards one side far away from the transmission shaft 5. A space for accommodating the limiting part 101 to move along the axial direction of the transmission shaft is formed between the blocking surface 9 and the rotating member 7, so that the rotating member can move along the axial direction. The limiting assembly 10 may be screwed to the flexible shaft 6, for example, the limiting assembly may be a compression nut.

In the exemplary embodiment, the shaft coupling system may be applied to various technical fields, for example, the shaft coupling system may be applied to a planetary wheel system, the rotating member may be a sun wheel, and the rotating member may be a planetary wheel.

The present exemplary embodiment also provides a planetary wheel system including the shaft coupling system described above.

The planetary wheel system provided by the exemplary embodiment has the same technical features and working principles as the shaft coupling system, and the above contents have been described in detail and are not described again here.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims

1. A shaft coupling system, comprising:

a drive shaft including a cavity extending axially therealong;

the flexible shaft comprises a positioning part and a first connecting part, and the positioning part is connected in the cavity of the transmission shaft in an interference manner;

the rotating piece is in splined connection with the first connecting part;

one end of the transmission shaft close to the rotating part is supported on a supporting bearing, and the positioning part is positioned at the corresponding position of the supporting bearing;

the flexible axle still includes:

the second connecting portion is located on one side, away from the first connecting portion, of the positioning portion, and the second connecting portion is in splined connection with the cavity of the transmission shaft.

2. The coupling system of claim 1, further comprising:

and the positioning pin is connected between the transmission shaft and the positioning part of the flexible shaft along the radial direction of the transmission shaft.

3. The shaft coupling system according to claim 1, wherein a side of the rotating member facing the transmission shaft is provided with a stopper having a stopper surface facing the rotating member, the shaft coupling system further comprising:

the limiting assembly is fixed on the flexible shaft and positioned between the transmission shaft and the rotary part, and comprises a limiting part extending to the blocking surface;

the limiting part is matched with the blocking surface and used for blocking the rotary part to move towards one side far away from the transmission shaft.

4. The shaft coupling system according to claim 3, wherein a space for accommodating axial movement of the stopper portion along the transmission shaft is provided between the stopper surface and the rotary member.

5. The coupling system of claim 3, wherein the stop assembly is threadably connected to the flex shaft.

6. The shaft coupling system according to claim 1, wherein said rotating member is a sun gear.

7. The shaft coupling system of claim 1, wherein the rotating member is a planetary.

8. A planetary wheel system, comprising at least one shaft coupling system according to any of claims 1-7.