Floating oil seal structure

Abstract

The utility model belongs to the technical field of tunneling equipment, and discloses a floating oil seal structure. The floating oil seal structure comprises a fixed oil seal seat, a rotary oil seal seat and a positioning pressing plate, the fixed oil seal seat is arranged on a fixed support, and the fixed oil seal seat abuts against an outer ring of a bearing; the rotary oil seal seat is arranged on the rotary shaft and abuts against an inner ring of the bearing, an annular sealing cavity is formed between the fixed oil seal seat and the rotary oil seal seat, the sealing cavity is communicated with an oil outlet channel of the bearing, a sealing piece is arranged in the sealing cavity, and the rotary oil seal seat applies acting force in the first direction to the sealing piece. The two sides, in the axial direction of the rotating shaft, of the sealing piece are elastically attached to the rotating oil seal base and the fixed oil seal base respectively. The positioning pressing plate is arranged on the fixed oil seal seat, the rotary oil seal seat is provided with an abutting plate, and the positioning pressing plate can abut against the abutting plate in the first direction. The floating oil seal structure can play a role in positioning the rotary oil seal seat so as to improve the sealing performance of the floating oil seal structure.

Description

Technical Field

[0001] The utility model relates to the technical field of tunneling equipment, in particular to a floating oil seal structure. Background Art

[0002] Roadheaders are mainly used for tunneling and mine excavation, and the cutting gearbox of the roadheader is the main working execution component; when the cutting gearbox of the roadheader is in operation, in order to prevent oil leakage from the gearbox, a floating oil seal is needed to seal the gearbox; the floating oil seal is usually arranged on the outside of the bearing between the fixed bracket and the rotating shaft, and is limited by a roller installed on the rotating shaft; however, the working environment of the cutting gearbox is harsh, and foreign objects such as gravel can easily enter the floating oil seal. At the same time, when facing different working conditions, repeated replacement of the roller can easily cause the floating oil seal to be displaced, resulting in positioning failure, which makes the floating oil seal very easy to be damaged. Utility Model Content

[0003] The utility model aims to provide a floating oil seal structure, which can play a positioning role on a rotating oil seal seat, so as to improve the sealing performance of the floating oil seal structure.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a floating oil seal structure, which is arranged between a fixed bracket and a rotating shaft, and comprises:

[0006] A fixed oil seal seat, the fixed oil seal seat is arranged on the fixed bracket, and the fixed oil seal seat abuts against the outer ring of the bearing along the axial direction of the rotating shaft;

[0007] A rotating oil seal seat, the rotating oil seal seat is arranged on the rotating shaft, the rotating oil seal seat abuts against the inner ring of the bearing along the axial direction of the rotating shaft, an annular sealing cavity is provided between the fixed oil seal seat and the rotating oil seal seat, the sealing cavity is communicated with the oil outlet channel of the bearing, a sealing member is provided in the sealing cavity, the rotating oil seal seat applies a force along a first direction to the sealing member, so that the sealing member elastically abuts against the rotating oil seal seat and the fixed oil seal seat on both sides along the axial direction of the rotating shaft respectively;

[0008] A positioning pressure plate is arranged on the fixed oil seal seat. The rotating oil seal seat has an abutment plate. The positioning pressure plate can abut against the abutment plate along a first direction so that the rotating oil seal seat is always in contact with the sealing member.

[0009] Preferably, a labyrinth sealing channel is provided between the positioning pressure plate, the fixed oil seal seat and the rotating oil seal seat, and the labyrinth sealing channel is communicated with the sealing cavity.

[0010] Preferably, a first fitting gap and a second fitting gap are vertically connected between the fixed oil seal seat and the rotating oil seal seat, the first fitting gap is connected to the sealing cavity, and the first fitting gap and the second fitting gap constitute the labyrinth sealing channel.

[0011] Preferably, a front channel is formed between the abutment plate and the fixed oil seal seat, and a vertically connected middle channel and a rear channel are formed between the abutment plate and the positioning pressure plate. The front channel is vertically connected to the first fitting gap and the middle channel respectively, and the front channel, the middle channel and the rear channel constitute the second fitting gap.

[0012] Preferably, the positioning pressure plate is connected to the fixed oil seal seat by bolts.

[0013] Preferably, the fixed oil seal seat has a stopper portion arranged in an annular shape, and the side surface of the sealing element abuts against the stopper portion along the first direction.

[0014] Preferably, the abutment plate is annularly arranged on the fixed oil seal seat, and the positioning pressure plate is annularly arranged on the fixed oil seal seat corresponding to the abutment plate.

[0015] The beneficial effects of the utility model are:

[0016] The floating oil seal structure provided by the utility model is arranged between the fixed bracket and the rotating shaft. Since the fixed oil seal seat and the rotating oil seal seat are respectively arranged on the fixed bracket and the rotating shaft, the fixed oil seal seat axially abuts against the outer ring of the bearing, and the rotating oil seal seat axially abuts against the inner ring of the bearing, and a sealing cavity is provided between the fixed oil seal seat and the rotating oil seal seat, so the rotating oil seal seat can rotate relative to the fixed oil seal seat under the drive of the rotating shaft, thereby ensuring the normal operation of the cutting gear box; the sealing cavity is connected with the oil outlet channel of the bearing, and since a sealing member is provided in the sealing cavity, both sides of the sealing member elastically abut against the rotating shaft The oil seal seat is provided with an abutment plate, and the positioning pressure plate can abut against the abutment plate along the first direction to position the oil seal seat, thereby preventing sealing failure caused by insufficient axial limit of the oil seal seat due to replacement of the roller, thereby further improving the sealing performance and reliability of the floating oil seal structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a floating oil seal structure provided by a specific embodiment of the utility model;

[0018] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0019] In the figure:

[0020] 100-fixed bracket;

[0021] 200-rotation axis;

[0022] 300-bearing;

[0023] 400-roller;

[0024] 1-Fixed oil seal seat; 11-Stopper;

[0025] 2-rotating oil seal seat; 21-butting plate;

[0026] 3- Sealed cavity;

[0027] 4- Seals;

[0028] 5- Positioning plate;

[0029] 6-labyrinth sealing channel; 61-first fitting gap; 62-second fitting gap; 621-front channel; 622-middle channel; 623-rear channel. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the utility model provides a floating oil seal structure, which is arranged between a fixed bracket 100 and a rotating shaft 200, and includes a fixed oil seal seat 1, a rotating oil seal seat 2 and a positioning pressure plate 5. The fixed oil seal seat 1 is arranged on the fixed bracket 100, and the fixed oil seal seat 1 abuts against the outer ring of the bearing 300 along the axial direction of the rotating shaft 200; the rotating oil seal seat 2 is arranged on the rotating shaft 200, and the rotating oil seal seat 2 abuts against the inner ring of the bearing 300 along the axial direction of the rotating shaft 200. An annular sealing cavity 3 is provided between the fixed oil seal seat 1 and the rotating oil seal seat 2, and the sealing cavity 3 is connected to the oil outlet channel of the bearing 300. In this embodiment, since the fixed oil seal seat 1 and the rotating oil seal seat 2 are respectively arranged on the fixed bracket 100 and the rotating shaft 200, the fixed oil seal seat 1 axially abuts against the outer ring of the bearing 300, and the rotating oil seal seat 2 axially abuts against the inner ring of the bearing 300, and there is a sealing cavity 3 between the fixed oil seal seat 1 and the rotating oil seal seat 2, the rotating oil seal seat 2 can rotate relative to the fixed oil seal seat 1 driven by the rotating shaft 200, thereby ensuring the normal operation of the cutting gear box.

[0035] A seal 4 is arranged in the sealing cavity 3, and the rotating oil seal seat 2 applies a force along the first direction to the seal 4, so that the seal 4 elastically abuts against the rotating oil seal seat 2 and the fixed oil seal seat 1 on both sides of the axial direction of the rotating shaft 200; the positioning pressure plate 5 is arranged on the fixed oil seal seat 1, and the rotating oil seal seat 2 has an abutment plate 21. The positioning pressure plate 5 can abut against the abutment plate 21 along the first direction, so that the rotating oil seal seat 2 is always abutted against the seal 4. In this embodiment, the sealing chamber 3 is connected with the oil outlet channel of the bearing 300. Since a sealing member 4 is provided in the sealing chamber 3, the two sides of the sealing member 4 are elastically abutted against the rotating oil seal seat 2 and the fixed oil seal seat 1. Therefore, the sealing member 4 can seal the sealing chamber 3 to prevent the internal bearing lubricating oil from leaking to the outside through the sealing chamber 3. At the same time, it can also prevent external mud, sand, dirt and other foreign matter from entering the gear box through the sealing chamber 3 and causing damage to the gear box. Since the rotating oil seal seat 2 has an abutment plate 21, the abutment plate 21 is protruded on the rotating oil seal seat 2 along the radial direction of the rotating shaft 200 away from the axis, and the positioning pressure plate 5 can abut against the abutment plate 21 along the first direction, thereby preventing the sealing failure caused by insufficient axial limitation of the rotating oil seal seat 2 due to replacement of the roller 400, further improving the sealing performance and reliability of the floating oil seal structure. Specifically, the rotating oil seal seat 2 and the fixed oil seal seat 1 are both annular structures. The rotating oil seal seat 2 is sleeved on the rotating shaft 200, and then the roller 400 is installed on the rotating shaft 200. The roller 400 presses the rotating oil seal seat 2 against the bearing 300 along a first direction, thereby elastically squeezing the seal 4; the fixed oil seal seat 1 is fixed to the fixed bracket 100 by bolts, and an annular sealing cavity 3 is formed between the fixed oil seal seat 1 and the rotating oil seal seat 2. The seal 4 is an O-ring or H-ring commonly used in this field. When the staff injects lubricating oil into the bearing 300, excess lubricating oil will enter the sealing cavity 3 through the oil outlet channel between the inner and outer rings. The seal 4 can prevent the lubricating oil from leaking to the outside, thereby playing a sealing role.

[0036] Furthermore, if Figure 2 As shown, a labyrinth sealing channel 6 is provided between the positioning pressing plate 5, the fixed oil seal seat 1 and the rotating oil seal seat 2, and the labyrinth sealing channel 6 is connected with the sealing chamber 3. In this embodiment, one end of the labyrinth sealing channel 6 is connected with the sealing chamber 3, and the other end is connected with the outside, and the labyrinth sealing channel 6 can play a mechanical sealing effect, thereby further improving the sealing ability of the floating oil seal structure.

[0037] Specifically, Figure 2As shown, a first fitting gap 61 and a second fitting gap 62 are vertically connected between the fixed oil seal seat 1 and the rotating oil seal seat 2. The first fitting gap 61 is connected to the sealing cavity 3. The first fitting gap 61 and the second fitting gap 62 form a labyrinth sealing channel 6. In this embodiment, the first fitting gap 61 extends along the radial direction of the rotating shaft 200, and the second fitting gap 62 extends along the axial direction of the rotating shaft 200. The first fitting gap 61 and the second fitting gap 62 are vertically connected to form a labyrinth sealing channel 6, which increases the difficulty of lubricating oil or foreign matter passing through the labyrinth sealing channel 6, thereby ensuring the sealing effect of the floating oil seal structure.

[0038] Specifically, Figure 2 As shown, a front channel 621 is formed between the abutment plate 21 and the fixed oil seal seat 1, and a middle channel 622 and a rear channel 623 are formed between the abutment plate 21 and the positioning pressure plate 5. The front channel 621 is vertically connected with the first matching gap 61 and the middle channel 622 respectively, and the front channel 621, the middle channel 622 and the rear channel 623 form a second matching gap 62. In this embodiment, the front channel 621 extends along the axial direction of the rotating shaft 200, the middle channel 622 extends along the radial direction of the rotating shaft 200, and the rear channel 623 extends along the axial direction of the rotating shaft 200. The front channel 621, the middle channel 622 and the rear channel 623 form the second matching gap 62, which increases the complexity of the labyrinth seal channel 6, thereby further improving the sealing effect of the floating oil seal structure.

[0039] Furthermore, if Figure 2 As shown, the positioning plate 5 is bolted to the fixed oil seal seat 1. In this embodiment, a fixing through hole is provided on the positioning plate 5, and a threaded hole is provided on the fixed oil seal seat 1. The staff passes the fixing bolt through the positioning plate 5 and screws it into the threaded hole on the fixed oil seal seat 1, so that the positioning plate 5 and the fixed oil seal seat 1 are detachably connected, which is convenient for disassembly and subsequent maintenance and replacement.

[0040] Furthermore, if Figure 2 As shown, the fixed oil seal seat 1 has a stopper 11 arranged in an annular shape, and the side surface of the seal 4 abuts against the stopper 11 along the first direction. In this embodiment, the stopper 11 is arranged in an annular shape on the fixed oil seal seat 1, and the seal 4 abuts against the stopper 11 along the first direction, thereby ensuring the sealing effect of the seal 4.

[0041] Further, the abutment plate 21 is annularly arranged on the fixed oil seal seat 1, and the positioning pressure plate 5 is annularly arranged on the fixed oil seal seat 1 corresponding to the abutment plate 21. In this embodiment, the abutment plate 21 is annularly arranged on the fixed oil seal seat 1, and the positioning pressure plate 5 is annularly arranged on the fixed oil seal seat 1 corresponding to the abutment plate 21, thereby ensuring that all parts of the rotating oil seal seat 2 along the circumferential direction can be stably and reliably limited, thereby ensuring the sealing performance of the floating oil seal structure.

[0042] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A floating oil seal structure, arranged between a fixed support (100) and a rotating shaft (200), characterized in that: The floating oil seal structure comprises: A fixed oil seal seat (1), the fixed oil seal seat (1) being arranged on the fixed bracket (100), the fixed oil seal seat (1) being against the outer ring of the bearing (300) along the axial direction of the rotating shaft (200); A rotating oil seal seat (2), the rotating oil seal seat (2) being arranged on the rotating shaft (200), the rotating oil seal seat (2) being pressed against the inner ring of the bearing (300) along the axial direction of the rotating shaft (200), an annular sealing cavity (3) being provided between the fixed oil seal seat (1) and the rotating oil seal seat (2), the sealing cavity (3) being communicated with the oil outlet passage of the bearing (300), a sealing member (4) being provided in the sealing cavity (3), the rotating oil seal seat (2) applying a force along a first direction to the sealing member (4), so that the sealing member (4) is elastically pressed against the rotating oil seal seat (2) and the fixed oil seal seat (1) on both sides along the axial direction of the rotating shaft (200); A positioning pressure plate (5), wherein the positioning pressure plate (5) is arranged on the fixed oil seal seat (1), the rotating oil seal seat (2) has an abutment plate (21), and the positioning pressure plate (5) can abut against the abutment plate (21) along a first direction so that the rotating oil seal seat (2) is always in contact with the sealing element (4).

2. The floating oil seal structure according to claim 1, characterized in that: A labyrinth sealing channel (6) is provided between the positioning pressure plate (5), the fixed oil seal seat (1) and the rotating oil seal seat (2), and the labyrinth sealing channel (6) is in communication with the sealing cavity (3).

3. The floating oil seal structure according to claim 2, characterized in that: A first fitting gap (61) and a second fitting gap (62) which are vertically connected are provided between the fixed oil seal seat (1) and the rotating oil seal seat (2); the first fitting gap (61) is connected to the sealing cavity (3); and the first fitting gap (61) and the second fitting gap (62) constitute the labyrinth sealing channel (6).

4. The floating oil seal structure according to claim 3, characterized in that: A front channel (621) is formed between the abutment plate (21) and the fixed oil seal seat (1), and a middle channel (622) and a rear channel (623) that are vertically connected are formed between the abutment plate (21) and the positioning pressure plate (5). The front channel (621) is vertically connected to the first fitting gap (61) and the middle channel (622), respectively. The front channel (621), the middle channel (622) and the rear channel (623) constitute the second fitting gap (62).

5. The floating oil seal structure according to claim 1, characterized in that: The positioning pressure plate (5) is bolted to the fixed oil seal seat (1).

6. The floating oil seal structure according to claim 1, characterized in that: The fixed oil seal seat (1) has a stop portion (11) arranged in an annular shape, and the side surface of the sealing element (4) abuts against the stop portion (11) along the first direction.

7. The floating oil seal structure according to any one of claims 1 to 6, characterized in that: The abutment plate (21) is arranged in an annular shape on the fixed oil seal seat (1), and the positioning pressure plate (5) is arranged in an annular shape on the fixed oil seal seat (1) corresponding to the abutment plate (21).

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