CN211423340U

CN211423340U - Speed reducer

Info

Publication number: CN211423340U
Application number: CN201921634300.XU
Authority: CN
Inventors: 宫崎仁孝; 潘林华
Original assignee: Nidec Shimpo Zhejiang Corp
Current assignee: Nidec Drive Technology Zhejiang Corp
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-09-04
Anticipated expiration: 2029-09-27

Abstract

The embodiment of the application provides a speed reducer, the speed reducer includes fixed part, input shaft, drive mechanism and output member at least, output member is the tube-shape, output member's axial one end with at least part of fixed part overlaps and is formed with the clearance in the footpath the clearance is provided with annular seal part, seal part in the footpath respectively with output member with the fixed part contact. Through this application embodiment, can avoid causing the bearing degradation because of outside impurity invades the speed reducer is inside, improve the reliability of product, ensure the life of speed reducer.

Description

Speed reducer

Technical Field

The embodiment of the application relates to the electromechanical field, especially relates to a speed reducer.

Background

In the conventional reduction gear unit, a bearing member is provided, and for example, in the planetary reduction gear unit, a bearing is provided between a planetary carrier and an inner ring gear, and the planetary carrier and the inner ring gear are relatively rotatable.

The inventor finds that: in the prior art, because the planet carrier and the inner ring gear rotate relatively, a gap is formed between the planet carrier and the inner ring gear in the axial direction, and the bearing is exposed in the gap, external impurities such as steam, dust and the like are easy to enter from the gap to cause the deterioration of the bearing.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems or other similar problems, embodiments of the present application provide a speed reducer, which can avoid the deterioration of a bearing caused by the intrusion of external impurities into the speed reducer, improve the reliability of a product, and ensure the service life of the speed reducer.

According to an aspect of the embodiments of the present application, there is provided a speed reducer including at least a fixing portion, an input shaft, a transmission mechanism, and an output member,

wherein the output member is cylindrical, one end of the output member in the axial direction overlaps at least a part of the fixing portion in the radial direction with a gap, and an annular seal member is provided in the gap and contacts the output member and the fixing portion in the radial direction.

In one or more embodiments, the speed reducer is a planetary speed reducer, the input shaft includes a sun gear, the transmission mechanism includes a plurality of planetary gears, the fixed portion includes a planetary carrier, the planetary gears are rotatable relative to the planetary carrier, and the output member includes an inner ring gear that is meshed with the planetary gears so as to be rotatable.

In one or more embodiments, the planetary gear has a planetary gear shaft, and the planetary gear is meshed with the sun gear so as to be rotatable about the planetary gear shaft.

In one or more embodiments, the reduction gear further has at least a first bearing provided inside the output member, the seal member is provided on an outer peripheral surface of the output member, and an inner peripheral surface of the seal member is in contact with the outer peripheral surface of the output member.

In one or more embodiments, the first bearing is located between the output member and the fixing portion to support the output member and the fixing portion.

In one or more embodiments, the sealing member is axially free from contact with the output member.

In one or more embodiments, the one end of the output member is not in contact with the fixing portion in the axial direction.

In one or more embodiments, the sealing member is made of a rubber material.

In one or more embodiments, the sealing member is a rubber ring with a metal ring embedded therein.

In one or more embodiments, when the speed reducer is in operation, the fit tolerance of the inner ring of the sealing component is phi 45H8, and the fit tolerance of the outer ring of the sealing component is phi 55H 8.

One of the beneficial effects of the embodiment of the application lies in: an annular seal member is provided in a gap formed by overlapping at least a part of the fixing portion and one end of the output member of the speed reducer in the axial direction, and the seal member is in contact with the output member and the fixing portion in the radial direction. Therefore, bearing deterioration caused by intrusion of external impurities into the interior of the speed reducer can be avoided, the reliability of the product is improved, and the service life of the speed reducer is ensured.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

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

fig. 1 is a schematic view of a speed reducer according to an embodiment of the present application.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In embodiments of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.

In the following description of the present application, for the sake of convenience of description, a direction parallel to a direction extending along the input shaft (central axis OO ') is referred to as an "axial direction", and a radial direction centered on the central axis OO' is referred to as a "radial direction". The direction around the central axis OO' is referred to as "circumferential". However, it should be noted that these are for convenience of description only, and do not limit the direction of the reducer when it is used or manufactured.

Embodiments of the present application will be described below with reference to the drawings.

The embodiment of the application provides a speed reducer, and fig. 1 is a schematic view of the speed reducer of the embodiment of the application, and shows a part of the speed reducer cut along an axial direction.

As shown in fig. 1, the reduction gear 10 includes at least a fixing portion 101, an input shaft 102, a transmission mechanism 103, and an output member 104.

In one or more embodiments, the output member 104 is cylindrical, one end (O' end) of the output member 104 in the axial direction overlaps at least a part of the fixing portion 101 in the radial direction, and a gap 105 is formed, and an annular seal member 106 is provided in the gap 105, the seal member 106 being in contact with the output member 104 and the fixing portion 101 in the radial direction, respectively.

As is clear from the above embodiment, the annular seal member 106 is provided in the gap 105 formed by overlapping at least a part of the fixing portion 101 and one end of the output member 104 of the speed reducer 10 in the axial direction, and the seal member 106 is in contact with the output member 104 and the fixing portion 101 in the radial direction. Therefore, bearing deterioration caused by intrusion of external impurities into the interior of the speed reducer can be avoided, the reliability of the product is improved, and the service life of the speed reducer is ensured.

In one or more embodiments, as shown in fig. 1, the speed reducer 10 further includes at least a first bearing 107, the first bearing 107 is disposed inside the output member 104, the sealing member 106 is disposed on the outer circumferential surface of the output member 104, and the inner circumferential surface of the sealing member 106 is in contact with the outer circumferential surface of the output member 104. This can provide a good sealing effect. However, the embodiment of the present invention is not limited to this, and the sealing member 106 may be provided on the inner circumferential surface of the output member 104, and may be selected by those skilled in the art as needed.

In one or more embodiments, a first bearing 107 is located between the output component 104 and the stationary portion 101 to support the output component 104 and the stationary portion 101. In this case, by sealing the seal member 106, it is possible to prevent foreign matter from entering the reduction gear 10 and causing degradation of the first bearing 107. However, the present invention is not limited to this, and other bearings may be provided in the reduction gear unit 10, and the deterioration of the other bearings may be prevented by the sealing of the sealing member 106.

In one or more embodiments, as shown in fig. 1, the seal member 106 does not contact the output member 104 in the axial direction, and thus, abrasion of the end portion of the seal member 106 due to relative rotation of the seal member 106 and the output member 104 can be avoided, and the service life of the seal member 106 can be ensured.

In one or more embodiments, as shown in fig. 1, the O' side end of the output member 104 is not in contact with the fixing portion 101 in the axial direction. This can avoid the output member 104 from being affected by the friction between the output member 104 and the fixing portion 101.

In one or more embodiments, the sealing member 106 is made of a rubber material, but the application is not limited thereto, and the sealing member 106 may be made of other materials with certain elasticity, such as resin, and the like, which can be selected by those skilled in the art according to actual needs.

In one or more embodiments, the sealing member 106 is a rubber ring with a metal ring embedded therein. This can provide a certain rigidity to the sealing member 106 while achieving sealing, and the sealing member 106 can be fixed to the gap 105 more favorably. However, the application is not limited thereto, and the sealing member 106 may have another structure, for example, a solid rubber ring, or may be set according to the shape of the gap between the output member 104 and the fixing portion 101, without being limited to a ring. The skilled person can select the desired one according to the actual need.

In one or more embodiments, the fit tolerance of the inner race 1061 of the seal component 106 is φ 45H8 and the fit tolerance of the outer race 1062 of the seal component 106 is φ 55H8 when the speed reducer 10 is in operation. Thus, when the speed reducer is driven and an internal pressure exists, a good seal between the sealing member 106 and the output member 104 and a good seal between the sealing member 106 and the fixing portion 101 can be ensured.

Wherein, the fitting tolerance of the inner ring 1061 of the sealing component 106 refers to the tolerance of the radial dimension of the inner ring 1061 of the sealing component 106 and the radial dimension of the outer circumference of the output component 104 fitted therewith, and the fitting tolerance of the outer ring 1062 of the sealing component 106 refers to the tolerance of the radial dimension of the outer ring 1062 of the sealing component 106 and the radial dimension of the inner circumference of the fixing portion 101 fitted therewith, and with regard to the definition of the fitting tolerance and the specific values of the fitting tolerance, reference may be made to the related art and standards, and details are not repeated herein. In addition, the fit tolerance of the inner ring 1061 and the outer ring 1062 of the sealing component 106 may be other values, which is not limited in the present application and can be set by a person skilled in the art according to the material and the radial dimension of the output component 104, the material and the radial dimension of the fixing portion 101, and the internal pressure condition existing in the radial driving of the reducer.

In one or more embodiments, the speed reducer 10 is a planetary speed reducer, in which case the input shaft 102 may include a sun gear, the transmission 103 may include a plurality of planet gears, the fixed part 101 may include a planet carrier relative to which the planet gears are rotatable, and the output member 104 may include an internal ring gear that meshes with the planet gears to be rotatable. Thus, an annular seal member 106 is provided in a gap formed by radially overlapping one end of the inner ring of the planetary reduction gear in the axial direction and at least a part of the carrier, and the seal member 106 is in contact with the inner ring and the carrier in the radial direction.

Therefore, bearing deterioration caused by intrusion of external impurities into the planetary reducer can be avoided, the reliability of the product is improved, and the service life of the planetary reducer is ensured. In addition, the planetary reduction gear may have other components such as a housing, a bearing member, and the like, and further, the planetary gear may have a planetary gear shaft, and the planetary gear may be meshed with the sun gear so as to be capable of rotating on its own axis about the planetary gear shaft.

It should be noted that the planetary reduction gear is only one example of the reduction gear of the embodiment of the present application, but the present application is not limited to the planetary reduction gear, and the reduction gear 10 may be any of various reduction gears, and it is within the scope of the present application description in the case where there is relative rotation between the output member of the reduction gear and the fixed portion.

According to the above embodiment, the annular seal member 106 is provided in the gap 105 formed by overlapping at least a part of the fixing portion 101 and one end of the output member 104 of the speed reducer 10 in the axial direction, and the seal member 106 is in contact with the output member 104 and the fixing portion 101 in the radial direction. Therefore, bearing deterioration caused by intrusion of external impurities into the interior of the speed reducer can be avoided, the reliability of the product is improved, and the service life of the speed reducer is ensured.

It is to be noted that the above is merely an exemplary description of the present application, but the present application is not limited thereto, and appropriate modifications may be made on the basis of the above respective embodiments. In addition, the above is only an exemplary description of each component, but the present application is not limited thereto, and the specific content of each component may also refer to the related art; it is also possible to add components not shown in fig. 1 or to reduce one or more components in fig. 1.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments that fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.

Claims

1. A speed reducer at least comprises a fixed part, an input shaft, a transmission mechanism and an output part, and is characterized in that,

the output member is cylindrical, one end of the output member in the axial direction overlaps at least a part of the fixing portion in the radial direction with a gap, and an annular seal member is provided in the gap and contacts the output member and the fixing portion in the radial direction.

2. A reduction gear according to claim 1, wherein the reduction gear is a planetary reduction gear, the input shaft includes a sun gear, the transmission mechanism includes a plurality of planetary gears, the fixed part includes a planetary carrier relative to which the planetary gears are rotatable, and the output member includes an inner ring gear that is rotatably meshed with the planetary gears.

3. The reduction gear according to claim 2, wherein the planetary gear has a planetary gear shaft, and the planetary gear is meshed with the sun gear and is rotatable about the planetary gear shaft.

4. A reduction gear according to claim 1 or 2, further comprising at least a first bearing provided inside the output member, wherein the seal member is provided on an outer peripheral surface of the output member, and wherein an inner peripheral surface of the seal member is in contact with the outer peripheral surface of the output member.

5. The speed reducer of claim 4, wherein the first bearing is located between the output member and the fixing portion to support the output member and the fixing portion.

6. A reducer according to claim 1 or 2, wherein the seal member does not contact the output member in the axial direction.

7. A reducer according to claim 1 or 2, wherein the one end of the output member is not in contact with the fixing portion in the axial direction.

8. A reducer according to claim 1 or 2, wherein the sealing member is made of a rubber material.

9. The reducer according to claim 8, wherein the sealing member is a rubber ring with a metal ring embedded therein.

10. A speed reducer according to claim 1 or 2, wherein the fit tolerance of the inner ring of the seal member is Φ 45H8 and the fit tolerance of the outer ring of the seal member is Φ 55H8 when the speed reducer is in operation.