Anti-rotation axial positioning sealing structure

Abstract

The utility model relates to an anti-rotation axial positioning sealing structure. The anti-rotation axial positioning sealing structure comprises an output shaft, a sun gear and a sealing end cover which covers the end face of an inner hole of the output shaft in a sealing mode. The sealing end cover abuts against the sun gear, and the end face is provided with a plurality of oil passing grooves arranged in parallel. The sealing end cover is sleeved with an O-shaped sealing ring, and sealing is achieved through the O-shaped sealing ring and an inner hole of the output shaft. An elastic check ring for a hole is arranged on the outer side of the sealing end cover, is clamped in an inner hole of the output shaft and abuts against the end face of the elastic pin, and the sealing end cover is axially limited. The sealing end cover is further provided with a plurality of elastic pins and is fixed to the circumference of the output shaft through the elastic pins. The single / double-layer O-shaped sealing ring for axial sealing is adopted for sealing to achieve the sealing effect, meanwhile, the elastic pin shaft is installed in the circumferential direction to prevent rotation, the hole check ring is adopted for axially fixing the sealing end cover, and meanwhile the end face of the check ring is used for blocking the end face of the elastic pin so as to prevent disengaging.

Description

Technical Field

[0001] The utility model belongs to the technical field of planetary gearboxes, and relates to an anti-rotation axial positioning and sealing structure. Background Art

[0002] Inside the housing of a planetary gearbox, an axial positioning mechanism is required to prevent the sun gear of the planetary gear train from axially moving. However, during the machining and assembly of the output shaft at the end, through holes must be drilled, which affects the axial positioning of the sun gear and the sealing of the gearbox, and a special sealing mechanism needs to be added. The conventional method is to install a plug gasket, and there are two basic structural forms as follows.

[0003] A. It is directly installed on the inner hole end face of the output shaft by an interference fit method to play a role in positioning and sealing. However, in actual assembly, due to the influence of machining accuracy, etc., the interference installation is difficult, and the sealing effect is not ideal.

[0004] B. The end cover is fixed to the end face of the output shaft by bolts, and an end face sealing ring is added to complete the sealing. In this structure, due to continuous vibration during the operation of the gearbox, the bolts are prone to loosening. After the bolts are loosened, the end face sealing fails, resulting in oil leakage. Furthermore, after the bolts fall off as a whole and enter the gearbox, the gearbox is damaged. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to solve the above problems and provide an anti-rotation axial positioning and sealing structure.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] An anti-rotation axial positioning and sealing structure includes an output shaft, a sun gear, and a sealing end cover sealed on the inner hole end face of the output shaft; one end of the sealing end cover abuts against the sun gear, and a plurality of oil passing grooves parallel to each other and penetrating the end face are provided on this end face; an O-ring is sleeved on the sealing end cover for sealing, and the space between the sealing end cover and the inner hole of the output shaft is sealed by the O-ring; an orifice snap ring is provided on the outer side of the sealing end cover, and the orifice snap ring is clamped on the inner hole of the output shaft and abuts against the end face of the elastic pin to axially limit the sealing end cover.

[0008] Further, a plurality of circumferentially distributed elastic pins are provided on the sealing end cover, and the sealing end cover is circumferentially fixed to the output shaft through the elastic pins.

[0009] Further, the inner hole of the output shaft is a stepped hole, one end of the sealing end cover extends into the stepped hole, and the end face is pressed against the stepped end face of the stepped hole.

[0010] Further, a plurality of circumferentially evenly distributed pin holes are provided on the stepped end face of the stepped hole, and the elastic pins are arranged in the pin holes.

[0011] Further, a 15° guiding cone is provided at one end of the sealing end cover extending into the stepped hole and at the inlet end of the stepped hole, and the length of the guiding cone ≥ 3 mm.

[0012] Further, one or more O-ring seals are sleeved on the sealing end cover at intervals along the axial direction.

[0013] The beneficial effects of the present utility model are as follows:

[0014] By changing the structural forms of the sealing end cover and the output shaft, the present utility model adopts single / double-layer O-ring seals for axial sealing to achieve the sealing effect. At the same time, in order to prevent the sealing cover from being rotated by the sun gear, an elastic pin is installed in the circumferential direction to prevent rotation, and a hole retaining ring is used to axially fix the sealing end cover. At the same time, the end face of the retaining ring blocks the end face of the elastic pin here to prevent it from coming out.

[0015] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0017] Figure 1 is the overall schematic diagram of the anti-rotation type axial positioning seal structure in the present utility model.

[0018] Figure 2 is the side view of the installation state of the sealing end cover in the present utility model.

[0019] Figure 3 is the structural schematic diagram of the sealing end cover in the present utility model.

[0020] Figure 4 is the schematic diagram of the hole retaining ring with elasticity in the present utility model.

[0021] Figure 5 is the structural schematic diagram of the output shaft in the present utility model.

[0022] Reference numerals: 1 - sun gear; 2 - sealing end cover; 3 - hole retaining ring with elasticity; 4 - elastic pin; 5 - O-ring seal; 6 - output shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following describes the implementation manners of the present utility model through specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0024] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Please refer to Figures 1 to 5 , which is an anti-rotation axial positioning sealing structure, including an output shaft 6, a sun gear 1, and a sealing end cover 2 sealed on the inner hole end face of the output shaft 6; one end of the sealing end cover 2 abuts against the sun gear 1, and a plurality of oil passing grooves parallel to each other and penetrating the end face are arranged on this end face; an O-ring 5 is sleeved on the sealing end cover 2 for sealing, and the space between the sealing end cover 2 and the inner hole of the output shaft 6 is sealed by the O-ring 5; a hole-type snap ring 3 is arranged on the outer side of the sealing end cover 2, and the hole-type snap ring 3 is clamped on the inner hole of the output shaft 6 and abuts against the end face of the elastic pin 4 to axially limit the sealing end cover 2.

[0027] A number of elastic pins 4 are arranged on the sealed end cover 2 in a circumferential distribution. There are 4 pin holes evenly distributed in the circumferential direction on the step end face of the stepped hole. The elastic pins 4 are installed in the pin holes and are circumferentially fixed to the output shaft 6 through the elastic pins 4. The method of installing 4 elastic pins 4 on the shaft in the circumferential direction is used to prevent rotation. A hole retaining ring is used to axially fix the sealed end cover 2. At the same time, the end face of the retaining ring blocks the end face of the elastic pin 4 here to prevent it from coming out. Since the elastic pin 4 has elasticity itself and has good self - adaptability to the pin hole, the accuracy requirement for the pin hole is relatively low. At the same time, the elastic pin 4 has good stability in the pin hole and is not easy to loosen and come out.

[0028] The inner hole of the output shaft 6 is a stepped hole. One end of the sealed end cover 2 extends into the stepped hole and its end face is pressed against the step end face of the stepped hole.

[0029] The function of the hole - type elastic retaining ring 3 in this embodiment is to axially position the sealed end cover 2 and prevent the elastic pin 4 from coming out at the same time.

[0030] Both the end of the sealed end cover 2 extending into the stepped hole and the inlet end of the stepped hole are provided with a 15° guiding cone, and the length of the guiding cone ≥ 3mm.

[0031] There are 2 O - ring seals 5, which are sleeved on the sealed end cover 2 at intervals along the axial direction to form a double - layer sealing structure. The O - ring seal 5 is made of rubber. The seal is ensured through compression deformation. It has good elasticity and can ensure good sealing effect even under slight vibration deformation during use.

[0032] In this embodiment, to ensure the axial positioning and end - face durability of the sun gear 1, the sealed end cover 2 is made of medium - carbon alloy steel and used after quenching, which ensures the durability of the sealed end cover 2. At the same time, on the end face in contact with the end face of the sun gear 1, a vertical oil groove is opened, and the sharp edges are removed at the notch of the groove. This is not only convenient for processing, but also can ensure the lubricating oil film on the positioning surface and is not easy to accumulate iron chips for wear.

[0033] To ensure the reliability of installation and use, the following requirements are made for the relevant mating dimensions of each part:

[0034] The lengths of the guiding cones L1 and L3 ≥ 3mm; the length of the elastic pin 4 ≥ L4 + L2;

[0035] The mating relationships of each group of holes are as follows: The mating of D and d uses H7 / h7, the mating of D3 and d3 uses F8 / h7, the size of d1 is the same as the middle diameter of the O - ring seal 5, and d4 = D5 - b.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An anti-rotation axial positioning and sealing structure, characterized in that: It includes an output shaft, a sun gear, and a sealing end cover sealed on the inner hole end face of the output shaft; one end of the sealing end cover abuts against the sun gear, and a plurality of oil through grooves arranged in parallel and penetrating the end face are provided on this end face; an O-ring seal is sleeved on the sealing end cover, and the space between the sealing end cover and the inner hole of the output shaft is sealed by the O-ring seal; a hole-type snap ring is arranged on the outer side of the sealing end cover, and the hole-type snap ring is clamped on the inner hole of the output shaft and abuts against the end face of the elastic pin to axially limit the sealing end cover.

2. The anti-rotation axial positioning and sealing structure according to claim 1, wherein: A number of elastic pins distributed circumferentially are provided on the sealing end cover, and the sealing end cover is fixedly connected to the output shaft in a circumferential manner through the elastic pins.

3. The anti-rotation axial positioning and sealing structure according to claim 1, characterized in that: The inner hole of the output shaft is a stepped hole, and one end of the sealing end cover extends into the stepped hole and its end face is pressed against the stepped end face of the stepped hole.

4. The anti-rotation axial positioning and sealing structure according to claim 3, wherein: A plurality of pin holes evenly distributed in a circumferential manner are provided on the stepped end face of the stepped hole, and the elastic pins are arranged in the pin holes.

5. The anti-rotation axial positioning and sealing structure according to claim 3, characterized in that: A 15° guiding cone is provided at one end of the sealing end cover extending into the stepped hole and at the inlet end of the stepped hole, and the length of the guiding cone is ≥ 3 mm.

6. The anti-rotation axial positioning and sealing structure according to claim 1, characterized in that: One or more O-ring seals are sleeved on the sealing end cover at intervals along the axial direction.

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