Forklift transmission output shaft sealing structure

Abstract

The utility model discloses a kind of forklift gearbox output shaft sealing structure, belong to forklift gearbox technical field, including box wall, the outside of box wall is provided with convex disc, the outside of convex disc is provided with outer support groove, the inside of box wall is provided with inner support groove, the end of inner support groove and outer support groove inner cavity is provided with sealing groove, two the sealing groove between being provided with perforation.The utility model in, install first bearing in the inner support groove of box wall inside, install second bearing in the outer support groove of box wall outside, so that output shaft rod fixed sleeve is connected on first bearing and second bearing, and two groups of first oil seal ring and second oil seal ring are arranged between first bearing and second bearing, the sealing between box wall and output shaft rod is carried out, using first bearing and second bearing can avoid the part of output shaft rod sealed and force produces deflection, guarantee the quality of sealing between output shaft rod and box wall, good practicability.

Description

Technical Field

[0001] This utility model relates to the field of forklift gearbox technology, and more specifically, to a sealing structure for the output shaft of a forklift gearbox. Background Technology

[0002] A forklift gearbox is a mechanical transmission system composed of a series of gears and bearings. Its main function is to control the speed and direction of travel of the forklift. During use, the forklift gearbox can convert the torque on the drive shaft into different speeds and torques according to the driver's needs to adapt to different working conditions. In order to prevent the lubricating oil in the gearbox from flowing out, it is necessary to seal the output shaft and the gearbox.

[0003] A search revealed that utility model patent CN218818031U discloses a novel sealing device for a mechanical forklift gearbox, comprising a gearbox wall, an end cover, a deep groove ball bearing, an output shaft, a insertion groove, a pluggable protective retaining ring structure, and a connecting seat. The end cover is located on the left side of the gearbox wall; the deep groove ball bearing is embedded in the middle of the gearbox wall. The arrangement of the retaining ring, retaining groove, positive oil seal, reverse oil seal, end cover, and output shaft facilitates dual oil seal operation during use, achieving both sealing and dustproofing effects. The arrangement of the end cover, insertion groove, retaining ring, positive oil seal, and reverse oil seal allows the reverse oil seal to be positioned outside the positive oil seal, providing dustproofing and preventing weathering of the positive oil seal due to environmental factors, thus maintaining its sealing performance.

[0004] However, the above patent still has the following shortcomings: when the gearbox output shaft drives the drive axle on the forklift to rotate, the output shaft is prone to a certain deviation in force. Relying on only one bearing to support the output shaft will cause the output shaft to squeeze one side of the oil seal, which will affect the sealing quality of the oil seal. Therefore, we propose a sealing structure for the output shaft of the forklift gearbox. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a sealing structure for the output shaft of a forklift gearbox.

[0006] To solve the above problems, this utility model adopts the following technical solution: a sealing structure for the output shaft of a forklift gearbox, including a housing wall, a convex plate provided on the outer side of the housing wall, an outer support groove provided on the outer side of the convex plate, an inner support groove provided on the inner side of the housing wall, sealing grooves provided at the ends of the inner and outer support grooves, a through hole provided between the two sealing grooves, an output shaft rod sleeved in the inner cavity of the through hole, sealing groove, outer support groove and inner support groove, a second bearing fixedly sleeved in the inner cavity of the outer support groove, a first bearing fixedly sleeved in the inner cavity of the inner support groove, the inner sides of the first and second bearings fixedly sleeved on the outer side of the output shaft rod, sealing components provided in the inner cavities of the two sealing grooves, and a sealing mechanism provided on the outer side of the convex plate.

[0007] As a preferred embodiment of the present invention, the sealing assembly includes a first oil seal ring and a second oil seal ring sleeved in the inner cavity of the sealing groove, the inner surfaces of the second oil seal ring and the first oil seal ring being in contact with the outer surface of the output shaft, and the end faces of the first oil seal ring and the second oil seal ring being in contact with each other.

[0008] As a preferred embodiment of this utility model, the sealing mechanism includes a sealing plate disposed on the side of the cam and multiple screw holes and a first sealing ring groove formed on the end face of the cam. A through hole is formed in the middle of the sealing plate, and the output shaft passes through the inner cavity of the through hole. Multiple bolts are sleeved on the sealing plate, and the ends of the bolts are threaded into the inner cavity of the screw holes. A first sealing ring post is fixedly connected to the end face of the sealing plate, and the end of the first sealing ring post is movably sleeved into the inner cavity of the first sealing ring groove. A second sealing ring groove is formed on the end face of the sealing plate, and a second sealing ring post is disposed on the side of the output shaft. The second sealing ring post is located in the inner cavity of the outer support groove, and the end of the second sealing ring post is movably sleeved into the inner cavity of the second sealing ring groove.

[0009] In a preferred embodiment of this utility model, the side of the first sealing ring column is in contact with the inner wall of the first sealing ring groove.

[0010] In a preferred embodiment of this utility model, the inner wall of the second sealing ring groove is in contact with the side of the end of the second sealing ring column.

[0011] In a preferred embodiment of this utility model, the inner diameter of the sealing groove is equal to the outer diameter of the first oil seal ring and the second oil seal ring, respectively.

[0012] Compared with the prior art, the advantages of this utility model are: (1) In this utility model, a first bearing is installed in the inner support groove on the inner side of the box wall, and a second bearing is installed in the outer support groove on the outer side of the box wall, so that the output shaft is fixedly sleeved on the first bearing and the second bearing. Two sets of first oil seal rings and second oil seal rings are set between the first bearing and the second bearing to seal the box wall and the output shaft. The use of the first bearing and the second bearing can avoid the output shaft from being biased due to force on the sealing part, thus ensuring the quality of the seal between the output shaft and the box wall.

[0013] (2) In this utility model, the sealing plate is installed on the outside of the cam by the cooperation of bolts and screw holes. The sealing plate and the cam are sealed by the cooperation between the first sealing ring groove and the first sealing ring column. The sealing plate and the output shaft are sealed by the cooperation between the second sealing ring column and the second sealing ring groove. Thus, the output shaft and the box wall are sealed again. It has good practicality. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 is an exploded view of the overall structure of this utility model.

[0016] Figure 3 is a schematic cross-sectional view of the present invention.

[0017] Figure 4 is a schematic diagram of the structure of the external support groove of this utility model.

[0018] Figure 5 is a schematic diagram of the internal support groove of this utility model.

[0019] Figure 6 is a schematic diagram of the sealing plate of this utility model.

[0020] Figure 7 is a schematic diagram of the structure of the first oil seal ring of this utility model.

[0021] The following are the labels in the diagram: 1. Box wall; 2. Perforation; 3. Sealing groove; 4. Outer support groove; 5. Inner support groove; 6. Protruding plate; 7. Sealing mechanism; 8. Output shaft; 9. First bearing; 10. Second bearing; 11. Sealing assembly; 12. First sealing ring groove; 13. First oil seal ring; 14. Second oil seal ring; 15. Sealing plate; 16. Screw hole; 17. Bolt; 18. Through hole; 19. Second sealing ring groove; 20. Second sealing ring post; 21. First sealing ring post. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0025] As shown in Figures 1 to 7, a sealing structure for the output shaft of a forklift gearbox includes a housing wall 1. A cam 6 is provided on the outer side of the housing wall 1, and an outer support groove 4 is provided on the outer side of the cam 6. An inner support groove 5 is provided on the inner side of the housing wall 1. Sealing grooves 3 are provided at the ends of the inner cavities of the inner support groove 5 and the outer support groove 4. A through hole 2 is provided between the two sealing grooves 3. An output shaft 8 is fitted into the inner cavities of the through hole 2, the sealing grooves 3, the outer support groove 4, and the inner support groove 5. A second bearing 10 is fixedly fitted into the inner cavity of the outer support groove 4, and a first bearing 9 is fixedly fitted into the inner cavity of the inner support groove 5. The inner surfaces of the first bearing 9 and the second bearing 10 are fixedly fitted onto the outer surface of the output shaft 8. Sealing components 11 are provided in the inner cavities of the two sealing grooves 3. A sealing mechanism 7 is provided on the outer side of the cam 6. The sealing component 11 includes components fitted into the sealing grooves 3. The inner surfaces of the first oil seal ring 13 and the second oil seal ring 14 in the inner cavity are in contact with the outer surface of the output shaft rod 8, and the end faces of the first oil seal ring 13 and the second oil seal ring 14 are in contact with each other. The sum of the widths of the first oil seal ring 13 and the second oil seal ring 14 is equal to the width of the inner cavity of the sealing groove 3. Example 2

[0026] Based on Embodiment 1, as shown in Figures 1 to 6, the sealing mechanism 7 includes a sealing plate 15 disposed on the side of the cam 6 and multiple screw holes 16 and a first sealing ring groove 12 opened on the end face of the cam 6. A through hole 18 is opened in the middle of the sealing plate 15, and the output shaft 8 passes through the inner cavity of the through hole 18. The inner wall of the through hole 18 and the side of the output shaft 8 are in contact. Multiple bolts 17 are sleeved on the sealing plate 15, and the ends of the bolts 17 are threaded into the inner cavity of the screw holes 16. A first sealing ring post 21 is fixedly connected to the end face of the sealing plate 15. The end of the first sealing ring post 21 is movably sleeved into the inner cavity of the first sealing ring groove 12. A second sealing ring groove 19 is opened on the end face of the sealing plate 15. A second sealing ring post 20 is disposed on the side of the output shaft 8. The second sealing ring post 20 is located in the inner cavity of the outer support groove 4, and the end of the second sealing ring post 20 is movably sleeved into the inner cavity of the second sealing ring groove 19. Example 3

[0027] Based on Embodiments 1 and 2, as shown in Figures 2 to 7, the side of the first sealing ring post 21 fits against the inner wall of the first sealing ring groove 12 to ensure the sealing performance of the first sealing ring post 21 when inserted into the inner cavity of the first sealing ring groove 12. The inner wall of the second sealing ring groove 19 fits against the side of the end of the second sealing ring post 20 to ensure the sealing performance of the second sealing ring post 20 when inserted into the inner cavity of the second sealing ring groove 19. The inner diameter of the sealing groove 3 is equal to the outer diameter of the first oil seal ring 13 and the second oil seal ring 14, respectively, to ensure the stability and sealing performance of the first oil seal ring 13 and the second oil seal ring 14 when fitted into the inner cavity of the sealing groove 3.

[0028] It should be noted that this utility model is a sealing structure for the output shaft of a forklift gearbox. During installation, a first oil seal ring 13 and a second oil seal ring 14 are respectively fitted into the inner cavities of the two sealing grooves 3. A second bearing 10 is fixedly fitted into the inner cavity of the outer support groove 4, and a first bearing 9 is fixedly fitted into the inner cavity of the outer support groove 4. The output shaft 8 is fixedly fitted into the inner side of the first bearing 9 and the second bearing 10, using the first bearing 9 and the second bearing 10 to support the output shaft 8. At the same time, the two sets of first oil seal rings 13 and second oil seal rings 14 seal the space between the gearbox wall 1 and the output shaft 8. In addition, a sealing plate 15 is fitted onto the outer side of the cam 6, so that the bolts 17 on the sealing plate 15 are threaded into the inner cavity of the bolt hole 16. At the same time, the first sealing ring post 21 on the sealing plate 15 is inserted into the inner cavity of the first sealing ring groove 12, thereby sealing the space between the sealing plate 15 and the cam 6. The second sealing ring post 20 on the side of the output shaft 8 is inserted into the sealing plate 15. The second sealing ring groove 19 on the upper part seals the seal between the sealing plate 15 and the output shaft 8, thereby ensuring the seal between the box wall 1 and the output shaft 8.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A forklift transmission output shaft sealing structure comprising a box wall (1), characterized in that: A convex plate (6) is provided on the outer side of the box wall (1), an outer support groove (4) is provided on the outer side of the convex plate (6), an inner support groove (5) is provided on the inner side of the box wall (1), a sealing groove (3) is provided at the end of the inner cavity of the inner support groove (5) and the outer support groove (4), a through hole (2) is provided between the two sealing grooves (3), an output shaft rod (8) is sleeved in the inner cavity of the through hole (2), the sealing groove (3), the outer support groove (4) and the inner support groove (5), a second bearing (10) is fixedly sleeved in the inner cavity of the outer support groove (4), a first bearing (9) is fixedly sleeved in the inner cavity of the inner support groove (5), the inner sides of the first bearing (9) and the second bearing (10) are fixedly sleeved on the outer side of the output shaft rod (8), a sealing assembly (11) is provided in the inner cavity of the two sealing grooves (3), and a sealing mechanism (7) is provided on the outer side of the convex plate (6).

2. The sealing structure of the output shaft of the gearbox of the forklift truck according to claim 1, characterized in that: The sealing assembly (11) includes a first oil seal ring (13) and a second oil seal ring (14) sleeved in the inner cavity of the sealing groove (3). The inner surfaces of the second oil seal ring (14) and the first oil seal ring (13) are in contact with the outer surface of the output shaft rod (8), and the end faces of the first oil seal ring (13) and the second oil seal ring (14) are in contact with each other.

3. The sealing structure of the output shaft of the gearbox of the forklift truck according to claim 1, characterized in that: The sealing mechanism (7) includes a sealing plate (15) disposed on the side of the cam (6) and multiple screw holes (16) and a first sealing ring groove (12) opened on the end face of the cam (6). A through hole (18) is opened in the middle of the sealing plate (15). The output shaft (8) passes through the inner cavity of the through hole (18). Multiple bolts (17) are sleeved on the sealing plate (15). The ends of the bolts (17) are threaded into the inner cavity of the screw holes (16). The end face of the sealing plate (15) A first sealing ring post (21) is fixedly connected, and the end of the first sealing ring post (21) is movably sleeved into the inner cavity of the first sealing ring groove (12). The end face of the sealing plate (15) is provided with a second sealing ring groove (19). The side of the output shaft rod (8) is provided with a second sealing ring post (20). The second sealing ring post (20) is located in the inner cavity of the outer support groove (4), and the end of the second sealing ring post (20) is movably sleeved into the inner cavity of the second sealing ring groove (19).

4. The forklift gearbox output shaft sealing structure according to claim 3, characterized in that: The side of the first sealing ring post (21) is in contact with the inner wall of the first sealing ring groove (12).

5. The forklift gearbox output shaft sealing structure according to claim 3, characterized in that: The inner wall of the second sealing ring groove (19) is in contact with the side of the end of the second sealing ring column (20).

6. The forklift gearbox output shaft sealing structure according to claim 2, characterized in that: The inner diameter of the sealing groove (3) is equal to the outer diameter of the first oil seal ring (13) and the second oil seal ring (14).

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