CN217502533U

CN217502533U - A seal structure and vertical gear box for vertical gear box

Info

Publication number: CN217502533U
Application number: CN202221437968.7U
Authority: CN
Inventors: 晏正国; 刘恩来
Original assignee: Flender Transmission System Co ltd
Current assignee: Flender Transmission System Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-09-27
Anticipated expiration: 2032-06-09

Abstract

The utility model relates to a seal structure (7) for vertical gear box, gear box include box (1), set up output shaft (2) at the box output and install gear (3) on the output shaft, and the output shaft is supported by bearing (4), and the bearing setting is in the lubricating grease intracavity that is used for holding lubricating grease, and the gear is lubricated by the lubricating oil that holds in the lubricating grease intracavity, and seal structure sets up between lubricating grease chamber and lubricating oil chamber and with both sealed isolations, and seal structure includes: a non-contact oil baffle formed in a cylindrical shape extending in an axial direction, one end of which is configured to be fixed to an inner surface of the case body and the other end of which is configured to be spaced apart from a rotatable surface inside the gear case near the lubricating oil chamber; and a contact type sealing member installed at the other end of the oil blocking member and configured to contact the rotatable surface, the oil blocking member forming a primary seal in a direction in which the lubricating oil splashes from the lubricating oil chamber toward the lubricating grease chamber, the sealing member forming a secondary seal. By forming the sealing structure into a double seal, the sealing performance is improved.

Description

A seal structure and vertical gear box for vertical gear box

Technical Field

The utility model relates to a seal structure for vertical gear box still relates to the vertical gear box that has this kind of seal structure.

Background

For vertically mounted gearboxes, the bearings at the output shaft are usually lubricated with grease, while the gears and other bearings inside the gearbox are lubricated with oil. During operation of the gearbox, lubricating oil carried up by the rotation of the gear may splash from the lubricating oil chamber into the lubricating grease chamber and thereby leak from the output shaft. To prevent such leakage, dry well type sealing structures as shown in fig. 1 are currently employed at the output shaft. The seal structure is constituted by a first metal member 100 and a second metal member 200 disposed coaxially around the output shaft, which prevent the lubricating oil from entering the grease chamber from the lubricating oil chamber. However, this sealing structure has disadvantages, such as high machining accuracy requirements for the two metal members and difficulty in centering the two members at the time of installation. Furthermore, during operation of the gearbox there is some wear between the metal surfaces of the two metal components, which will shorten the service life of the sealing structure.

For this reason, there is a need for an improved sealing structure for a vertical gearbox.

SUMMERY OF THE UTILITY MODEL

For overcoming at least one defect of prior art, the utility model provides a reinforcing sealing performance's a seal structure for vertical gear box.

According to an aspect of the utility model, a seal structure for vertical gear box is provided, the gear box includes the box, sets up the output shaft of the output of box with install output epaxial gear, the output shaft is supported by the bearing, the bearing sets up in the lubricating grease intracavity that is used for holding lubricating grease, the gear is lubricated by the lubricating oil that holds in the lubricating grease intracavity, seal structure sets up the lubricating grease chamber with between the lubricating grease chamber and with both seal isolation, seal structure includes: a non-contact type oil baffle formed in a cylindrical shape extending in an axial direction, one end of which is configured to be fixed to an inner surface of the case body and the other end of which is configured to be spaced apart from a rotatable surface inside the gear case adjacent to the lubricating oil chamber; and a contact type seal member installed at the other end of the oil blocking member and configured to contact the rotatable surface, wherein the oil blocking member is formed as a primary seal and the seal member is formed as a secondary seal in a direction in which the lubricating oil splashes from the lubricating oil chamber toward the grease chamber.

According to one embodiment, the oil blocking member is formed with a cavity at the other end and an oil return hole penetrating the oil blocking member to communicate the cavity with the lubricating oil chamber, and the seal member is mounted at the cavity.

According to one embodiment, the oil deflector comprises a partition extending in the axial direction and an oil deflector connected to an axial end of the partition, the oil deflector having a bottom wall fixed to the partition and extending towards and upwardly from a radially outer side of the oil deflector, the cavity being formed between the bottom wall and the outer side wall, the seal being positioned on the bottom wall.

According to one embodiment, the oil dam further comprises an inner sidewall extending upwardly from a radially inner side of the bottom wall, the seal further being positioned on the inner sidewall.

According to one embodiment, said bottom wall is flat, one or more said oil return holes are provided in said bottom wall, arranged along the circumference of said oil barrier, said bottom wall extending in the radial direction of said oil barrier or obliquely with respect to the radial direction of said oil barrier, said oil return holes being provided at the lowest point of said bottom wall.

According to one embodiment, a blocking wall extending upwardly from the bottom wall is further provided between the outer side wall and the seal, the blocking wall being spaced from the outer side wall.

According to one embodiment, the sealing structure is provided with a plurality of said blocking walls and has one or more of the following features: the oil return holes are formed in the bottom wall between the blocking walls; each barrier wall is provided with a radial communication hole which makes the concave cavities in fluid communication; and a line connecting the tips of the plurality of barrier walls and the tip of the outer sidewall in the radial direction is formed in a wavy or zigzag shape.

According to one embodiment, the seal is a lip seal opening towards the radially outer side of the oil barrier, the lip seal comprising a V-seal, a U-seal, a Y-seal or a YX-seal.

According to an embodiment, the oil retainer is formed in one piece and the sealing structure is formed as a two-part structure, and/or the rotatable surface is an outer surface of the output shaft or the gear.

According to the utility model discloses a vertical gear box is provided to another aspect, vertical gear box includes above-mentioned seal structure, seal structure is in the lubricating grease chamber with between the lubricating grease chamber fix extremely the box.

The utility model discloses a form the seal structure of vertical gear box into non-contact and contact dual seal, simplified seal structure's structure greatly, reduced the installation requirement, improved sealing performance to seal structure's life has been prolonged.

Drawings

Other features and advantages of the present invention will be apparent from the description and drawings, which illustrate, by way of example, specific details of various embodiments according to the invention.

Fig. 1 is a schematic perspective view of a conventional gear box sealing structure.

Fig. 2 is a schematic partial cross-sectional view of a vertical gearbox including a seal structure according to an embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a rectangular block portion a in fig. 2.

Figure 4 is an enlarged schematic view of an alternate embodiment of the seal structure shown in figure 3.

Detailed Description

Specific embodiments and modifications thereof according to the present invention will be described in detail below with reference to the accompanying drawings.

For convenience in description, spatially relative terms "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", and the like, are used herein to define various components and their connections. This is not intended to be limiting. These relative spatial relationships may also be reversed or changed as the orientation of the components is changed without affecting the scope of the present invention.

Fig. 2 is a schematic partial cross-sectional view of a vertical gearbox including a seal structure according to an embodiment of the present invention. As shown in fig. 2, the vertical type gear box includes a case 1, an output shaft 2 provided at an output end of the case 1, and a gear 3 mounted on the output shaft 2, wherein the output shaft 2 is supported by a bearing 4, and the bearing 4 is lubricated by grease, so that a grease chamber 5 for containing grease is formed around the output shaft 2 at the bearing 4. Further, in order to lubricate other transmission components such as the gear 3, a lubricating oil chamber 6 for accommodating lubricating oil is formed outside (shown as a radial outside in the drawing) the grease chamber 5. In order to avoid that the lubricating oil in the lubricating oil chamber 6 splashes into the lubricating grease chamber 5 during operation of the gearbox, a sealing structure 7 is provided between the lubricating grease chamber 5 and the lubricating oil chamber 6 for hermetically isolating the two.

As shown in fig. 2 and 3, the seal structure 7 is formed in a two-part structure including a non-contact type oil deflector 8 and a contact type seal member such as a V-ring 9 mounted on the oil deflector 8. For convenience of description, a longitudinal extending direction of the oil deflector 8 is defined as an axial direction, and a direction perpendicular to the axial direction is defined as a radial direction. The axial direction of the oil retainer 8 may coincide with the axial direction of the output shaft 2 when the oil retainer 8 is installed in the gear case.

As shown in fig. 2, the oil deflector 8 is formed in a cylindrical shape extending in the axial direction, which is disposed around the output shaft 2, with one end (lower end as shown in the drawing) fixed to the case 1 of the gear case and the other end (upper end as shown in the drawing) close to the gear 3 but not in contact with the gear 3, i.e., with a gap formed between the oil deflector 8 and the gear 3, so that the oil deflector 8 is formed as a non-contact seal. The oil baffle 8 forms a barrier between the lubricant chamber 6 and the grease chamber 5, and forms a first seal, i.e., a primary seal, for the lubricant in the lubricant chamber 6 in the direction of splashing toward the grease chamber 5. Since the other end of the oil deflector 8 is not in contact with the gear 3, the mounting requirements are reduced. Further, as shown in fig. 3, the oil blocking member 8 may be further formed with a cavity 16 at the other end thereof, and an oil return hole 10 penetrating the oil blocking member 8 is formed at the cavity 16, the oil return hole 10 communicating the cavity 16 with the lubricant chamber 6 so that the lubricant splashed into the cavity 16 is returned to the lubricant chamber 6 through the oil return hole 10.

A V-shaped seal 9 is mounted on the other end of the oil deflector 8 and contacts the gear 3, forming a contact seal. The V-shaped sealing ring 9 is opened towards one side of the lubricating oil cavity 6 to form a second sealing of lubricating oil, namely secondary sealing. When the lubricating oil splashes into the oil retainer 8 through the gap between the oil retainer 8 and the gear 3, the V-shaped seal 9 blocks the lubricating oil from passing further into the grease chamber 5. Since the V-shaped seal 9 only needs to be positioned on the oil retainer 8 and in slight pressure contact with the gear 3, the mounting requirements of the V-shaped seal 9 and the oil retainer 8 are reduced. Further, when the oil deflector 8 is formed with the above-described cavity 16, the V-shaped seal ring 9 is positioned radially inward with respect to the cavity 16 to block splashed lubricating oil radially outward of the V-shaped seal ring 9.

By forming the non-contact type and the contact type two-way sealing of the sealing structure 7, the structure and the processing of the sealing structure 7 are simplified, the installation requirement is reduced, and the integral sealing performance is improved. In addition, by providing the oil return hole 10 in the oil blocking member 8, accumulation of lubricating oil in the oil blocking member 8 is avoided, and the sealing performance is further enhanced.

The specific structure of the oil deflector 8 will be described below by way of example. As shown in fig. 3, the oil deflector 8 includes a partition 11 extending in the axial direction and an oil deflector 12 connected to the partition 11. One end of the partition 11 is intended to be fixed to the case 1 of the gearbox and the other end is intended to be arranged close to the gear 3. The oil retainer 12 is connected to the partition 11 at the other end of the partition 11. The oil retainer 12 and the spacer 11 may be welded together so that the oil retainer 8 is formed as a single piece, and further, the seal structure 7 is constituted only by two parts of the oil retainer 8 and the V-ring 9, thereby simplifying the construction of the seal structure. However, the oil deflector 12 and the partition 11 may also be formed as separate components that are sealingly connected together in other ways. Furthermore, it will be appreciated by those skilled in the art that when the oil retainer 8 is installed in the gearbox, the oil retainer 12 is located above the oil level in the grease cavity and above the grease in the grease cavity.

As shown in fig. 3, the oil deflector 12 may include a bottom wall 13 extending toward the radially outer side of the oil deflector 8, and an inner side wall 14 and an outer side wall 15 respectively located on both radial sides of the bottom wall 13 and extending upward, wherein the bottom wall 13 is fixed to the partition 11, for example, by welding, and the top ends of the inner side wall 14 and the outer side wall 15 are spaced apart from the gear 3. The inner side wall 14, the bottom wall 13 and the outer side wall 15 enclose a cavity 16 open at the top, so that the V-ring 9 is mounted in the cavity 16, while the cavity 16 is also capable of receiving the lubricating oil splashed from the lubricating-oil chamber 6. In order to avoid the accumulation of splashed lubricating oil in the cavity 16, the oil dam 12 may be provided with an oil return hole 10 in the bottom wall 13, the oil return hole 10 communicating the cavity 16 with the lubricating oil chamber 6, so that the lubricating oil entering the cavity 16 is returned to the lubricating oil chamber 6. The oil return hole 10 is provided in the bottom wall 13 mainly between the V-shaped seal ring 9 and the outer side wall 15 of the oil deflector 12, and may be formed as one hole arranged in the circumferential direction or as a plurality of discrete holes arranged at intervals.

Although fig. 3 shows that the bottom wall 13 is formed to extend horizontally outward in the radial direction, the bottom wall 13 may also extend obliquely with respect to the radial direction (not shown), and the oil return hole 10 is provided at the lowest point of the bottom wall 13, for example, at the corner where the bottom wall 13 meets the outer side wall 15, so as to return as much lubricating oil to the lubricating-oil chamber 6 as possible.

The inner sidewall 14 of the oil dam 12 may be used to position the V-ring 9 from the radially inner side, e.g., the V-ring 9 is biased radially inward against the inner sidewall 14. The inner side wall 14 may be formed as a continuous wall extending in the circumferential direction of the oil deflector 12, that is, as one integral side wall. It is contemplated, however, that the inner sidewall 14 may be comprised of multiple portions circumferentially spaced from one another. Further, it is conceivable that the inner side wall 14 may be omitted because the V-ring 9 may be embedded in the bottom wall 13 of the oil retainer 12 to be positioned.

Advantageously, the outer side wall of the oil deflector 12 is formed as a circumferentially continuous annular wall. In addition, in order to enhance the primary sealing performance of the oil baffle 8, one or more annular blocking walls 17 (shown in fig. 4) extending upward from the bottom wall 13 may be additionally provided between the outer side wall 15 and the V-shaped seal ring 9, and these blocking walls 17 may be spaced apart from and parallel to the outer side wall 15. Oil return holes 10 may be provided in the bottom wall 13 between the respective blocking walls 17 and between the blocking walls 17 and the outer side wall 15, or radial communication holes (not shown) may be provided in the respective blocking walls 17 to enable fluid communication in the cavity 16. In order to enhance the function of blocking the lubricating oil, the connecting line formed radially connecting the top ends of these blocking walls 17 and the top end of the outer side wall 15 may be formed in a wavy shape, such as a zigzag shape or a wavy shape. Thus, the amount of the lubricating oil that enters the oil baffle 8 is greatly reduced by the multiple blockage of the lubricating oil that splashes from the lubricating oil chamber 6.

Although it is described above with reference to the drawings that one end of the oil deflector 8 is fixed to the inner surface of the gear case 1 and the other end is spaced apart from the gear 3 to form a non-contact seal, it is conceivable that the other end of the oil deflector 8 may be spaced apart from other rotatable surfaces, for example, a shoulder of the output shaft 2, or a distance ring or the like on the output shaft 2, depending on the configuration of the gear case, as long as the oil deflector 8 can be formed as a non-contact oil deflector 8 that is not in contact with the rotatable surfaces.

Furthermore, although the figure shows that one V-shaped seal ring 9 is installed in the oil blocking portion 12, a plurality of side-by-side V-shaped seal rings 9 may be provided to enhance the sealing performance, if necessary, such as two, three or more V-shaped seal rings 9 arranged in order in the radial direction. Furthermore, the V-shaped seal 9 may be replaced by lip seals of other shapes, such as U-shaped seals, Y-shaped seals, YX-shaped seals, etc. These lip seals can be standard seals, thereby reducing costs.

The oil deflector 8 may be made of metal and the sealing member may be made of an elastic material, thereby simplifying the fit between the two and reducing wear.

While specific embodiments in accordance with the invention have been described in detail with reference to the accompanying drawings, the invention is not limited to the specific structure described above, but covers various modifications and equivalent features. Various changes may be made by those skilled in the art without departing from the scope of the invention.

Claims

1. A sealing structure (7) for a vertical gearbox, characterized in that the gearbox comprises a housing (1), an output shaft (2) arranged at the output of the housing (1), and a gear (3) mounted on the output shaft (2), the output shaft (2) being supported by a bearing (4), the bearing (4) being arranged in a grease chamber (5) for containing grease, the gear (3) being lubricated by grease contained in a grease chamber (6), the sealing structure (7) being arranged between and sealing-isolating the grease chamber (5) and the grease chamber (6), the sealing structure (7) comprising:

a non-contact type oil baffle (8) formed in a cylindrical shape extending in an axial direction, one end of which is configured to be fixed to an inner surface of the case (1) and the other end of which is configured to be spaced apart from a rotatable surface inside the gear case near the lubricating oil chamber (6); and

a contact type seal member installed at the other end of the oil retainer (8) and configured to contact the rotatable surface,

wherein the oil stopper (8) is formed as a primary seal and the seal is formed as a secondary seal in a direction in which the lubricating oil splashes from the lubricating-oil chamber (6) toward the grease chamber (5).

2. The seal structure (7) according to claim 1, wherein the oil blocking member (8) is formed at the other end with a cavity (16) and an oil return hole (10) penetrating the oil blocking member (8) to communicate the cavity (16) with the lubricating-oil chamber (6), the seal being mounted at the cavity (16).

3. The seal structure (7) according to claim 2, wherein the oil deflector (8) includes a partition (11) extending in the axial direction and an oil deflector (12) connected to an axial end portion of the partition (11), the oil deflector (12) having a bottom wall (13) fixed to the partition (11) and extending toward a radially outer side of the oil deflector (8) and an outer side wall (15) extending upward from the radially outer side of the bottom wall (13), the cavity (16) being formed between the bottom wall (13) and the outer side wall (15), the seal being positioned on the bottom wall (13).

4. The seal structure (7) of claim 3, wherein the oil dam (12) further includes an inner sidewall (14) extending upwardly from a radially inner side of the bottom wall (13), the seal being further positioned on the inner sidewall (14).

5. The sealing structure (7) according to claim 3, characterized in that the bottom wall (13) is flat, one or more oil return holes (10) arranged along the circumference of the oil deflector (8) are provided in the bottom wall (13), the bottom wall (13) extends in the radial direction of the oil deflector (8) or obliquely with respect to the radial direction of the oil deflector (8), and the oil return holes (10) are provided at the lowest point of the bottom wall (13).

6. A sealing arrangement (7) according to claim 3, characterised in that a blocking wall (17) extending upwardly from the bottom wall (13) is further provided between the outer side wall (15) and the seal, the blocking wall (17) being arranged spaced from the outer side wall (15).

7. The sealing structure (7) according to claim 6, characterised in that it is provided with a plurality of said blocking walls (17) and has one or more of the following features:

the oil return holes (10) are arranged in the bottom wall (13) between the blocking walls (17);

each barrier wall (17) is provided with radial communication holes which allow the fluid communication of said cavities (16); and

a line connecting the tips of the plurality of blocking walls (17) and the tip of the outer side wall (15) in the radial direction is formed in a wavy or zigzag shape.

8. The sealing structure (7) according to claim 1, wherein the sealing member is a lip sealing member that opens to a radially outer side of the oil deflector (8), the lip sealing member including a V-shaped seal ring, a U-shaped seal ring, a Y-shaped seal ring, or a YX-shaped seal ring.

9. A sealing arrangement (7) according to any of claims 1-8, characterised in that the oil retainer (8) is formed in one piece and the sealing arrangement (7) is formed as a two-part construction, and/or that the rotatable surface is an outer surface of the output shaft (2) or the gear wheel (3).

10. A vertical gearbox, characterized in that it comprises a sealing structure (7) according to any one of claims 1-9, said sealing structure (7) being fixed to the box (1) between the grease chamber (5) and the oil chamber (6).