CN221943155U - Speed reducer sealing structure - Google Patents

Abstract

The utility model relates to the technical field of input shaft sealing, in particular to a speed reducer sealing structure, which comprises an input flange arranged on an input shaft of a speed reducer, wherein an oil sealing piece sleeved on the input shaft is arranged between the input shaft and the input flange, a shaft convex conical surface positioned on one side of the oil sealing piece is arranged on the outer side wall of the input shaft, a shell concave conical surface is arranged on the inner side wall of the input flange, which is arranged opposite to the input shaft, the shell concave conical surface is matched with the shaft convex conical surface, and a groove surface on the oil sealing piece is arranged opposite to the shaft convex conical surface. Oil leakage is prevented through the oil sealing piece and the multiple measures of the shaft convex conical surface, so that the oil leakage condition of the input end on the input shaft is greatly reduced, and the oil leakage condition of the input end of the high-rotation speed reducer is reduced.

Description

A reducer sealing structure

Technical Field

The utility model relates to the technical field of input shaft sealing, in particular to a reducer sealing structure.

Background Art

Oil seals are mechanical components used to seal oil (oil is the most common liquid substance in the transmission system, and also refers to general liquid substances). They isolate the parts of the transmission that need lubrication from the output parts to prevent the lubricating oil from leaking.

The structure of an existing conventional cycloid pinwheel reducer is shown in FIG1 . The input end is mainly composed of an input flange, a skeleton oil seal 1 , an input shaft and other components. The input end seal of the reducer is mainly undertaken by a skeleton oil seal 1 . Since the input end speed is relatively high, after the reducer has been running for a certain period of time, it is easy to leak oil due to the aging of the skeleton oil seal 1 . Since the input end speed is relatively high, the seeping oil is easy to splash and enter the equipment at the input end, thereby causing damage to the input end equipment. In addition, many industries have high requirements for the environment of the production workshop, and the seeping oil will also pollute the workshop environment, thereby causing greater losses.

For example, on August 18, 2017, a patent with publication number CN107061739A was published, entitled "A patent for a main gear oil seal structure of a rear axle reducer assembly", which includes an active bevel gear, a tapered roller bearing, an oil seal, an end cover and a steel sleeve. An end cover is welded to the lower end of the steel sleeve, and the end cover is interference-connected with the tapered roller bearing. An oil seal is installed between the tapered roller bearing and the end cover via an oil seal seat. The oil seal structure has a simple design and good practicality, and is positioned by the end face of the oil seal seat. However, in the above documents, the only sealing method used is the oil seal, which is prone to oil leakage after aging of the oil seal.

Summary of the invention

In view of this, the purpose of the utility model is to provide a reducer sealing structure to solve the problem that a single oil seal is prone to oil leakage after the oil seal ages.

Based on the above purpose, the utility model provides a reducer sealing structure, including an input flange installed on the input shaft of the reducer, an oil seal sleeved on the input shaft is arranged between the input shaft and the input flange, a shaft convex conical surface located on one side of the oil seal is arranged on the outer wall of the input shaft, a shell concave conical surface is arranged on the inner side wall of the input flange which is arranged facing the input shaft, the shell concave conical surface is matched with the shaft convex conical surface, and the groove surface on the oil seal is arranged facing the shaft convex conical surface.

Optionally, at least one annular sealing tooth opened on the inner side wall of the input flange is provided between the shell concave cone surface and the oil seal, and the annular sealing tooth is provided around the outer side wall of the input shaft.

Optionally, when the number of the annular sealing teeth is greater than one, the plurality of annular sealing teeth are arranged at equal intervals.

Optionally, a ring tip is provided on a side of the opening of the annular sealing tooth, and a wear-resistant layer is provided on the ring tip.

Optionally, the material of the wear-resistant layer is polytetrafluoroethylene.

Optionally, an oil storage groove arranged on the input flange is provided on the other side of the oil seal, and the oil storage groove is arranged to face the outer side wall of the input shaft.

Optionally, an oil drain hole connected to the oil storage tank is provided on the input flange.

Beneficial effects of the utility model: the utility model provides a reducer sealing structure. On the one hand, the oil seal is arranged to prevent oil leakage. On the other hand, the arrangement of the concave cone surface of the outer shell and the convex cone surface of the shaft forms a cone surface gap. When the input shaft rotates at a high speed, the oil will be rebounded by the convex cone surface of the shaft for many times, thereby flying out of the gap and producing a sealing effect. Oil leakage is prevented by various measures such as the oil seal and the convex cone surface of the shaft, which greatly reduces the oil leakage at the input end of the input shaft, thereby reducing the occurrence of oil leakage at the input end of the high-speed reducer.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a cycloid pinwheel reducer in the prior art;

Fig. 2 is a schematic diagram of the structure of the utility model;

FIG3 is a schematic diagram of the structure of the connection between the input shaft and the input flange of the utility model;

FIG4 is a schematic structural diagram of an input flange of the present invention;

Fig. 5 is a schematic diagram of the cross-sectional structure of A-A in Fig. 4;

FIG. 6 is a schematic structural diagram of the input shaft of the present invention.

In the figure: 1. skeleton oil seal; 2. input flange; 3. oil seal; 4. input shaft; 5. shaft convex conical surface; 6. shell concave conical surface; 7. annular sealing teeth; 8. oil storage tank; 9. oil drain hole.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

As shown in Figures 2 to 6, a reducer sealing structure includes an input flange 2 installed on the input shaft 4 of the reducer, an oil seal 3 sleeved on the input shaft 4 is arranged between the input shaft 4 and the input flange 2, a shaft convex conical surface 5 located on one side of the oil seal 3 is arranged on the outer wall of the input shaft 4, a shell concave conical surface 6 is arranged on the inner side wall of the input flange 2 facing the input shaft 4, the shell concave conical surface 6 is matched with the shaft convex conical surface 5, and the groove surface on the oil seal 3 is arranged facing the shaft convex conical surface 5.

The oil seal 3 is a skeleton oil seal, and the setting of the skeleton oil seal is convenient for preventing oil leakage. The setting of the concave cone surface 6 of the shell and the convex cone surface 5 of the shaft forms a cone surface gap. When the input shaft 4 rotates at high speed, the oil will be rebounded by the convex cone surface 5 of the shaft for many times, thereby flying out of the gap and producing a sealing effect. The oil seal 3 and the convex cone surface 5 of the shaft are used to prevent oil leakage, which greatly reduces the oil leakage at the input end of the input shaft 4, thereby reducing the occurrence of oil leakage at the input end of the high-speed reducer.

At least one annular sealing tooth 7 is provided between the shell concave conical surface 6 and the oil seal 3 and is opened on the inner side wall of the input flange 2. The annular sealing tooth 7 is arranged around the outer side wall of the input shaft 4. When the number of the annular sealing teeth 7 is greater than one, a plurality of the annular sealing teeth 7 are arranged at equal intervals. Due to the arrangement of the annular sealing teeth 7, a series of throttling gaps and expansion spaces are formed between the input shaft 4 and the annular sealing teeth 7. The oil passes through many tortuous passages and generates great resistance after multiple throttling, making it difficult for the oil to leak, thereby achieving the sealing purpose.

A ring tip is provided on the side of the opening of the annular sealing tooth 7, and a wear-resistant layer is provided on the ring tip. The material of the wear-resistant layer can be polytetrafluoroethylene, but is not limited to this. The deformation of the wear-resistant layer after being clamped on the input shaft 4 of the power output provides a continuous clamping force to the annular sealing tooth 7, making it difficult for oil to leak, thereby achieving the sealing purpose.

The other side of the oil seal 3 is provided with an oil storage tank 8 arranged on the input flange 2. The oil storage tank 8 is arranged opposite to the outer side wall of the input shaft 4. Even if oil leaks out, the oil can enter the oil storage tank 8 for storage, thereby preventing oil leakage, reducing the possibility of oil appearing outside the reducer, and preventing pollution of customer equipment and the environment.

The input flange 2 is provided with an oil drain hole 9 connected to the oil storage tank. When a certain amount of oil is stored in the oil storage tank 8, the stored oil can be discharged through the oil drain hole 9, and the stored oil can be added to the reducer for continued use, thereby enhancing the sealing effect of the input end.

A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims (7)

1. The utility model provides a reduction gear seal structure, its characterized in that, including installing the epaxial input flange of input of reduction gear, the input with be provided with the cover between the input flange and establish epaxial oil blanket spare of input, be provided with on the lateral wall of input and be located the protruding conical surface of axle of oil blanket spare one side, the input flange with be provided with the concave conical surface of shell on the inside wall that the input set up in opposite directions, the concave conical surface of shell sets up with the protruding conical surface cooperation of axle, the recess face on the oil blanket spare with the protruding conical surface of axle sets up in opposite directions.

2. The seal structure of claim 1, wherein at least one annular seal tooth provided on an inner sidewall of the input flange is provided between the concave conical surface of the housing and the oil seal member, the annular seal tooth being provided around an outer sidewall of the input shaft.

3. The seal structure of claim 2, wherein a plurality of the annular seal teeth are disposed at equal intervals when the number of the annular seal teeth is greater than one.

4. The sealing structure of a speed reducer according to claim 2, wherein a ring tip is arranged on the side edge of the opening of the annular sealing tooth, and a wear-resistant layer is arranged on the ring tip.

5. A decelerator sealing structure as claimed in claim 4, the wear-resistant layer is characterized in that the wear-resistant layer is made of polytetrafluoroethylene.

6. The sealing structure of a speed reducer according to claim 1, wherein an oil storage groove is provided on the input flange on the other side of the oil seal member, and the oil storage groove is provided opposite to the outer side wall of the input shaft.

7. The seal structure of claim 6, wherein the input flange is provided with an oil drain hole in communication with the oil reservoir.