Muddy-water-proof sealing structure for output shaft of gearbox of paddy field beating machine and gearbox

Abstract

The utility model relates to a muddy water-proof sealing structure for an output shaft of a gearbox of a paddy field beating machine and the gearbox. The muddy water-proof sealing structure comprises an output spline shaft, a first output flange, a first protective oil seal seat and a first floating oil seal, the output spline shaft is pivoted with the gearbox body through a bearing, and the first output flange is arranged at one end of the output spline shaft and is in key connection with the output spline shaft; the first protective oil seal seat is arranged on the outer ring of the first output flange; the first floating oil seal is arranged between the first output flange and the first protective oil seal seat, a movable oil seal ring of the first floating oil seal is fixed on the first output flange, and a static oil seal ring of the first floating oil seal is fixed on the first protective oil seal seat. The bidirectional-output gearbox output shaft is conveniently assembled on a bidirectional-output gearbox output shaft of a paddy field beating machine, fine silt is effectively prevented through the floating oil seal, straw or large silt can be prevented from entering the gearbox output shaft through the output flange and the protective oil seal base, the double-protection effect is achieved, the sealing effect is guaranteed, the sealing performance of the oil seal is prevented from being damaged, and the service life of the gearbox output shaft is prolonged. The service life of the machine is prolonged.

Description

Technical Field

[0001] The utility model relates to an output structure of a gearbox of a paddy field pulping machine, in particular to a mud and water proof sealing structure for an output shaft of a gearbox of a paddy field pulping machine and a gearbox. Background Art

[0002] The paddy field pulping machine is an important device in rice planting; after the rice is harvested, a large amount of straw will remain in the soil. Using the pulping machine to break the straw in the soil can avoid the straw affecting the planting and growth of crops, efficiently complete the tillage operation of the paddy field, and provide a good seedbed condition for transplanting. The functions of the rice include stirring the pulp, burying the stubble and leveling the land. Stirring the pulp is a process in which the straw can be fully mixed with the soil during the pulping process to realize the process of gushing out the mud and covering the straw under the mud. Burying the stubble is to press the straw that still remains on the ground surface during the stirring process into the soil by means of mechanical spring rulers to prevent the straw from floating and reduce the workload of manual stubble fishing. The leveling function is to level the uneven positions in the field through the machine's flat floor to realize soil scooping and leveling, and to smooth the grooves pressed by the machine's spring rulers. The work of the paddy field pulping machine is generally carried out in the paddy field with mud and water mixed. Therefore, the output shaft part of the paddy field pulping machine gearbox is often eroded by the mud and water mixed with sand and grass stems; the output shaft of the conventional paddy field pulping machine gearbox is directly connected to the cutter shaft of the pulping machine, and the output shaft of the gearbox and the gearbox housing are sealed by a skeleton oil seal. However, the outer lip of the skeleton oil seal is waterproof but not sand-proof, and can only prevent larger grass stems, and has a poor protection effect on finer sand and gravel. The sand and gravel in the mud and water will wear the outer lip of the skeleton oil seal. Over time, the sealing performance of the oil seal will be damaged, affecting the service life of the machine. The floating oil seal can effectively prevent fine sand and gravel from entering through the frictional fit between the static and dynamic oil seal rings. However, for the output shaft of the two-way output paddy field pulping machine gearbox, it is difficult to arrange the floating oil seal in the conventional structure. Therefore, it is necessary to improve the sealing structure of the output shaft part of the paddy field pulping machine gearbox. Summary of the Invention

[0003] In order to solve the above technical problems, the utility model provides a mud and water proof sealing structure for an output shaft of a paddy field pulping machine gearbox. The mud and water proof sealing structure is located at the output end of the gearbox, and the mud and water proof sealing structure at least includes an output spline shaft, a first output flange, a first protective oil seal seat, and a first floating oil seal;

[0004] The output spline shaft is pivotally connected to the gearbox housing through a bearing, and the middle part of the output spline shaft is key-connected to the output shaft cylindrical spur gear;

[0005] The first output flange is arranged at one end of the output spline shaft and is key-connected to the output spline shaft; the end of the output spline shaft passes through the first output flange and is screwed with a self-locking nut, and the first output flange is fastened by the self-locking nut;

[0006] The first protective oil seal seat is arranged on the outer ring of the first output flange, and the first protective oil seal seat is fixed to the gearbox housing by bolts;

[0007] The first floating oil seal is arranged between the first output flange and the first protective oil seal seat. The dynamic oil seal ring of the first floating oil seal is fixed on the first output flange, and the static oil seal ring is fixed on the first protective oil seal seat.

[0008] Furthermore, the sealing structure also includes a second output flange, a second protective oil seal seat, and a second floating oil seal; the second output flange, the second protective oil seal seat, and the second floating oil seal are arranged at the other end of the output spline shaft, and the two ends of the output spline shaft are symmetrically arranged.

[0009] Furthermore, a first O-ring is provided between the first output flange and the inner ring of the first tapered roller bearing; and a second O-ring is provided between the second output flange and the inner ring of the second tapered roller bearing.

[0010] Furthermore, the first output flange and the second output flange have the same structure, including a flange and a spline sleeve, a through hole is provided in the middle of the flange, one end of the spline sleeve is connected to the flange, and the middle is through; an annular retaining ring is provided on the inner side of the flange, and the annular retaining ring is located on the outer ring of the spline sleeve; the dynamic oil seal ring of the floating oil seal is fixed on the inner side of the annular retaining ring. The first output flange and the second output flange are used to connect with the beater blade shaft to transmit torque to the beater blade shaft and drive the beater blade shaft to rotate.

[0011] Furthermore, the first protective oil seal seat and the second protective oil seal seat have the same structure, a through hole is provided in the middle part of the body of the protective oil seal seat, an outer ring retaining ring and an inner ring retaining ring are provided on the body, and a bolt through hole is opened on the body between the outer ring retaining ring and the inner ring retaining ring; the static oil seal ring of the floating oil seal is fixed on the inner side of the inner ring retaining ring; the flange plate of the output flange is located on the inner side of the outer ring retaining ring of the protective oil seal seat, and a gap is provided between the flange plate and the outer ring retaining ring; the annular retaining ring of the output flange is located on the inner side of the inner ring retaining ring of the protective oil seal seat, and a gap is provided between the annular retaining ring and the inner ring retaining ring.

[0012] The utility model also provides a gearbox for a paddy field pulping machine with a mud and water prevention sealing structure, which includes a gearbox housing, an input shaft, a first bevel gear, a second bevel gear, a first transmission shaft, a first spur gear, a second transmission shaft, a second spur gear and the above-mentioned mud and water prevention sealing structure. The input shaft is pivotally connected to the input end of the gearbox housing, and the input shaft is connected to the first bevel gear. The first transmission shaft is pivotally connected to the upper part inside the gearbox housing. The second bevel gear and the first spur gear are arranged on the first transmission shaft, and the first bevel gear meshes with the second bevel gear. The second transmission shaft is pivotally connected to the middle part inside the gearbox housing. The second spur gear is arranged on the second transmission shaft, and the second spur gear meshes with the first spur gear. The mud and water prevention sealing structure is arranged at the lower output end of the gearbox housing, and the second spur gear meshes with the output shaft spur gear in the mud and water prevention sealing structure.

[0013] Advantages of the utility model:

[0014] A mud and water prevention sealing structure for the output shaft of a gearbox of a paddy field pulping machine provided by the utility model is convenient for assembly. Especially for the output shaft of a gearbox of a paddy field pulping machine with bidirectional output, it can be installed separately from the two output ends. Through the frictional cooperation between the dynamic and static oil seal rings of the floating oil seal, fine sediment can be effectively prevented. The clearance fit between the output flange and the protective oil seal seat can also prevent straw or larger sediment from entering, achieving a double protection effect, ensuring the sealing effect, avoiding damaging the sealing performance of the oil seal, and improving the service life of the machine. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0016] Figure 2 It is a schematic diagram of a partial structure of Embodiment 1;

[0017] Figure 3 It is a schematic structural diagram of Embodiment 2;

[0018] Figure 4 It is a schematic structural diagram of the output flange;

[0019] Figure 5 It is a sectional view structural diagram of the output flange;

[0020] Figure 6 It is a schematic structural diagram of the protective oil seal seat;

[0021] Figure 7 It is a sectional view structural diagram of the protective oil seal seat;

[0022] Figure 8 It is a schematic structural diagram of Embodiment 7;

[0023] Figure 9 It is a schematic diagram of the external structure of Embodiment 7 Figure One;

[0024] Figure 10 Schematic diagram of the appearance structure of Example 7 Figure Two 。

[0025] 1. Output spline shaft 2. First output flange 3. First protective oil seal seat 4. First floating oil seal 5. First tapered roller bearing 6. Second tapered roller bearing 7. Transmission case 8. Output shaft spur gear 9. Self-locking nut 10. Second output flange 11. Second protective oil seal seat 12. Second floating oil seal 13. First O-ring 14. Second O-ring 15. Input shaft 16. First bevel gear 17. Second bevel gear 18. First transmission shaft 19. First spur gear 20. Second transmission shaft 21. Second spur gear 22. Bolt 201. Flange 202. Spline shaft sleeve 203. Annular retaining ring 301. Outer ring retaining ring 302. Inner ring retaining ring 401. Dynamic oil seal ring 402. Static oil seal ring. Detailed implementation method

[0026] Example 1,

[0027] Referring to Figure 1 , 2 As shown in, this example provides an anti-mud and water sealing structure for the output shaft of a paddy field pulping machine transmission. The anti-mud and water sealing structure is located at the output end of the transmission. The anti-mud and water sealing structure at least includes an output spline shaft 1, a first output flange 2, a first protective oil seal seat 3, and a first floating oil seal 4; the output spline shaft 1 is pivotally connected to the transmission case 7 through a first tapered roller bearing 5 and a second tapered roller bearing 6, and the middle part of the output spline shaft 1 is key-connected to the output shaft spur gear 8; the first output flange 2 is provided at one end of the output spline shaft 1 and is key-connected to the output spline shaft 1; the end of the output spline shaft 1 passes through the first output flange 2 and is screwed with a self-locking nut 9, and the first output flange 2 is fastened by the self-locking nut 9; the first protective oil seal seat 3 is provided on the outer ring of the first output flange 2, and the first protective oil seal seat 3 is fixed on the transmission case 7 through a bolt 22; the first floating oil seal 4 is provided between the first output flange 2 and the first protective oil seal seat 3, the dynamic oil seal ring 401 of the first floating oil seal 4 is fixed on the first output flange 2, and the static oil seal ring 402 is fixed on the first protective oil seal seat 3.

[0028] Example 2,

[0029] Referring to Figure 3As shown in the figure, this embodiment provides an anti-mud and water sealing structure for the output shaft of a paddy field pulping machine gearbox. The anti-mud and water sealing structure is symmetrically arranged at both ends of the output spline shaft 1. The anti-mud and water sealing structure includes an output spline shaft 1, a first output flange 2, a first protective oil seal seat 3, a first floating oil seal 4, a second output flange 10, a second protective oil seal seat 11, and a second floating oil seal 12. The output spline shaft 1 is pivotally connected to the gearbox housing 7 through a first tapered roller bearing 5 and a second tapered roller bearing 6. The middle part of the output spline shaft 1 is key-connected to the output shaft cylindrical spur gear 8. The first output flange 2 is arranged at one end of the output spline shaft 1 and is key-connected to the output spline shaft 1. The second output flange 10 is arranged at the other end of the output spline shaft 1 and is key-connected to the output spline shaft 1. Both ends of the output spline shaft 1 respectively pass through the first output flange 2 and the second output flange 10, and are screwed with self-locking nuts 9. The first output flange 2 and the second output flange 10 are respectively fastened by the self-locking nuts 9. The first protective oil seal seat 3 is arranged on the outer ring of the first output flange 2, and the second protective oil seal seat 11 is arranged on the outer ring of the second output flange 10. The first protective oil seal seat 3 and the second protective oil seal seat 11 are respectively fixed on the gearbox housing 7 by bolts 22. The first floating oil seal 4 is arranged between the first output flange 2 and the first protective oil seal seat 3, and the second floating oil seal 12 is arranged between the second output flange 10 and the second protective oil seal seat 11. The moving oil seal ring 401 of the first floating oil seal 4 is fixed on the first output flange 2, and the static oil seal ring 402 is fixed on the first protective oil seal seat 3. The moving oil seal ring 401 of the second floating oil seal 12 is fixed on the second output flange 10, and the static oil seal ring 402 is fixed on the second protective oil seal seat 11.

[0030] Embodiment 3

[0031] Refer to Figure 2 As shown in the figure, this embodiment provides an anti-mud and water sealing structure for the output shaft of a paddy field pulping machine gearbox. On the basis of Embodiment 1, a first O-ring 13 is provided between the first output flange 2 and the inner ring of the first tapered roller bearing 5.

[0032] Embodiment 4

[0033] Refer to Figure 3 As shown in the figure, this embodiment provides an anti-mud and water sealing structure for the output shaft of a paddy field pulping machine gearbox. On the basis of Embodiment 2, a first O-ring 13 is provided between the first output flange 2 and the inner ring of the first tapered roller bearing 5, and a second O-ring 14 is provided between the second output flange 10 and the inner ring of the second tapered roller bearing 6.

[0034] Embodiment 5

[0035] Refer to Figure 4 、 5As shown, this embodiment provides a mud and water sealing structure for the output shaft of a paddy field beater gearbox. On the basis of Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4, the first output flange 2 and the second output flange 10 have the same structure, including a flange 201 and a spline sleeve 202. A through hole is provided in the middle of the flange 201, and one end of the spline sleeve 202 is connected to the flange 201, and the middle is penetrated; an annular retaining ring 203 is provided on the inner side of the flange 201, and the annular retaining ring 203 is located on the outer ring of the spline sleeve 202; the dynamic oil seal ring 401 of the floating oil seal is fixed on the inner side of the annular retaining ring 203.

[0036] Embodiment 6,

[0037] See also Figure 6 , 7 As shown, this embodiment provides a mud and water sealing structure for the output shaft of a paddy field beater gearbox. On the basis of Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4 or Embodiment 5, the structures of the first protective oil seal seat 3 and the second protective oil seal seat 11 are the same, a through hole is provided in the middle of the body of the protective oil seal seat, an outer ring retaining ring 301 and an inner ring retaining ring 302 are provided on the body, and a bolt through hole is opened on the body between the outer ring retaining ring 301 and the inner ring retaining ring 302; the static oil seal ring 402 of the floating oil seal is fixed on the inner side of the inner ring retaining ring 302; the flange plate 201 of the output flange is located on the inner side of the outer ring retaining ring 301 of the protective oil seal seat, and a gap is provided between the flange plate 201 and the outer ring retaining ring 301; the annular retaining ring 203 of the output flange is located on the inner side of the inner ring retaining ring 302 of the protective oil seal seat, and a gap is provided between the annular retaining ring 203 and the inner ring retaining ring 302.

[0038] Embodiment 7,

[0039] See also Figures 8 - 10As shown in the figure, this embodiment provides a paddy field pulping machine gearbox with a mud and water-proof sealing structure, including a gearbox housing 7, an input shaft 15, a first bevel gear 16, a second bevel gear 17, a first transmission shaft 18, a first spur gear 19, a second transmission shaft 20, a second spur gear 21, and a mud and water-proof sealing structure. The input shaft 15 is pivotally connected to the input end of the gearbox housing 7, and the input shaft 15 is connected to the first bevel gear 16. The first transmission shaft 18 is pivotally connected to the upper part inside the gearbox housing 7. The second bevel gear 17 and the first spur gear 19 are arranged on the first transmission shaft 18, and the first bevel gear 16 meshes with the second bevel gear 17. The second transmission shaft 20 is pivotally connected to the middle part inside the gearbox housing 7. The second spur gear 21 is arranged on the second transmission shaft 20, and the second spur gear 21 meshes with the first spur gear 19. The mud and water-proof sealing structure is arranged at the lower output end of the gearbox housing 7. The second spur gear 21 meshes with the output shaft spur gear 8 in the mud and water-proof sealing structure. The mud and water-proof sealing structure is symmetrically arranged at both ends of the output spline shaft 1. The mud and water-proof sealing structure includes an output spline shaft 1, a first output flange 2, a first protective oil seal seat 3, a first floating oil seal 4, a second output flange 10, a second protective oil seal seat 11, and a second floating oil seal 12. The output spline shaft 1 is pivotally connected to the gearbox housing 7 through a first tapered roller bearing 5 and a second tapered roller bearing 6. The middle part of the output spline shaft 1 is key-connected to the output shaft spur gear 8. The first output flange 2 is arranged at one end of the output spline shaft 1 and is key-connected to the output spline shaft 1. The second output flange 10 is arranged at the other end of the output spline shaft 1 and is key-connected to the output spline shaft 1. Both ends of the output spline shaft 1 respectively pass through the first output flange 2 and the second output flange 10 and are screwed with self-locking nuts 9. The first output flange 2 and the second output flange 10 are respectively fastened by the self-locking nuts 9. The first protective oil seal seat 3 is arranged on the outer ring of the first output flange 2. The second protective oil seal seat 11 is arranged on the outer ring of the second output flange 10. The first protective oil seal seat 3 and the second protective oil seal seat 11 are respectively fixed on the gearbox housing 7 by bolts 22. The first floating oil seal 4 is arranged between the first output flange 2 and the first protective oil seal seat 3. The second floating oil seal 12 is arranged between the second output flange 10 and the second protective oil seal seat 11. The dynamic oil seal ring 401 of the first floating oil seal 4 is fixed on the first output flange 2, and the static oil seal ring 402 is fixed on the first protective oil seal seat 3. The dynamic oil seal ring 401 of the second floating oil seal 12 is fixed on the second output flange 10, and the static oil seal ring 402 is fixed on the second protective oil seal seat 11.

[0040] A first O-ring 13 is arranged between the first output flange 2 and the inner ring of the first tapered roller bearing 5, and a second O-ring 14 is arranged between the second output flange 10 and the inner ring of the second tapered roller bearing 6.

[0041] The first output flange 2 and the second output flange 10 have the same structure, including a flange 201 and a spline sleeve 202. A through hole is provided in the middle of the flange 201, and one end of the spline sleeve 202 is connected to the flange 201, and the middle is through; an annular retaining ring 203 is provided on the inner side of the flange 201, and the annular retaining ring 203 is located on the outer ring of the spline sleeve 202; the dynamic oil seal ring 401 of the floating oil seal is fixed on the inner side of the annular retaining ring 203.

[0042] The first protective oil seal seat 3 and the second protective oil seal seat 11 have the same structure, a through hole is provided in the middle of the body of the protective oil seal seat, an outer ring retaining ring 301 and an inner ring retaining ring 302 are provided on the body, and a through hole for bolts 22 is opened on the body between the outer ring retaining ring 301 and the inner ring retaining ring 302; the static oil seal ring 402 of the floating oil seal is fixed on the inner side of the inner ring retaining ring 302; the flange plate 201 of the output flange is located on the inner side of the outer ring retaining ring 301 of the protective oil seal seat, and a gap is provided between the flange plate 201 and the outer ring retaining ring 301; the annular retaining ring 203 of the output flange is located on the inner side of the inner ring retaining ring 302 of the protective oil seal seat, and a gap is provided between the annular retaining ring 203 and the inner ring retaining ring 302.

Claims

1. A mud and water sealing structure for the output shaft of a paddy field beater gearbox, the mud and water sealing structure is located at the output end of the gearbox, and is characterized by: The anti-mud and water sealing structure at least includes an output spline shaft, a first output flange, a first protective oil seal seat, and a first floating oil seal; The output spline shaft is pivotally connected to the gearbox housing through a bearing, and the middle portion of the output spline shaft is key-connected to the output shaft cylindrical spur gear; The first output flange is arranged at one end of the output spline shaft and is key-connected with the output spline shaft; the end of the output spline shaft passes through the first output flange and is threaded with a self-locking nut, and the first output flange is fastened by the self-locking nut; The first protective oil seal seat is arranged on the outer ring of the first output flange, and the first protective oil seal seat is fixed to the gearbox housing by bolts; The first floating oil seal is arranged between the first output flange and the first protective oil seal seat. The dynamic oil seal ring of the first floating oil seal is fixed on the first output flange, and the static oil seal ring is fixed on the first protective oil seal seat.

2. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 1, characterized in that: The sealing structure also includes a second output flange, a second protective oil seal seat, and a second floating oil seal; the second output flange, the second protective oil seal seat, and the second floating oil seal are arranged at the other end of the output spline shaft, and the two end structures of the output spline shaft are arranged symmetrically.

3. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 1, characterized in that: A first O-shaped sealing ring is arranged between the first output flange and the inner ring of the first tapered roller bearing.

4. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 2, characterized in that: A first O-shaped sealing ring is arranged between the first output flange and the inner ring of the first tapered roller bearing; and a second O-shaped sealing ring is arranged between the second output flange and the inner ring of the second tapered roller bearing.

5. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 1, characterized in that: The first output flange includes a flange and a spline sleeve. A through hole is provided in the middle of the flange. One end of the spline sleeve is connected to the flange and the middle is through. An annular retaining ring is provided on the inner side of the flange. The annular retaining ring is located on the outer ring of the spline sleeve. The dynamic oil seal ring of the floating oil seal is fixed on the inner side of the annular retaining ring.

6. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 2, characterized in that: The first output flange and the second output flange have the same structure, including a flange and a spline sleeve. A through hole is provided in the middle of the flange, one end of the spline sleeve is connected to the flange, and the middle is through; an annular retaining ring is provided on the inner side of the flange, and the annular retaining ring is located on the outer ring of the spline sleeve; the dynamic oil seal ring of the floating oil seal is fixed on the inner side of the annular retaining ring.

7. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 1, characterized in that: A through hole is provided in the middle of the body of the first protective oil seal seat, an outer ring retaining ring and an inner ring retaining ring are provided on the body, and a bolt through hole is opened on the body between the outer ring retaining ring and the inner ring retaining ring; the static oil seal ring of the floating oil seal is fixed on the inner side of the inner ring retaining ring; the flange plate of the output flange is located on the inner side of the outer ring retaining ring of the protective oil seal seat, and a gap is provided between the flange plate and the outer ring retaining ring; the annular retaining ring of the output flange is located on the inner side of the inner ring retaining ring of the protective oil seal seat, and a gap is provided between the annular retaining ring and the inner ring retaining ring.

8. The anti-mud and water sealing structure for the output shaft of a paddy field beater gearbox according to claim 1, characterized in that: The first protective oil seal seat and the second protective oil seal seat have the same structure, a through hole is provided in the middle of the body of the protective oil seal seat, an outer ring retaining ring and an inner ring retaining ring are provided on the body, and a bolt through hole is opened on the body between the outer ring retaining ring and the inner ring retaining ring; the static oil seal ring of the floating oil seal is fixed on the inner side of the inner ring retaining ring; the flange plate of the output flange is located on the inner side of the outer ring retaining ring of the protective oil seal seat, and a gap is provided between the flange plate and the outer ring retaining ring; the annular retaining ring of the output flange is located on the inner side of the inner ring retaining ring of the protective oil seal seat, and a gap is provided between the annular retaining ring and the inner ring retaining ring.

9. A paddy field beater gearbox with a mud and water proof sealing structure, characterized in that: It includes a gearbox housing, an input shaft, a first bevel gear, a second bevel gear, a first transmission shaft, a first cylindrical spur gear, a second transmission shaft, a second cylindrical spur gear and a mud and water proof sealing structure for the output shaft of a paddy field beater gearbox as described in any one of claims 1 to 8, wherein the input shaft is pivoted at the input end of the gearbox housing, the input shaft is connected to the first bevel gear, the first transmission shaft is pivoted at the upper part of the gearbox housing, the second bevel gear and the first cylindrical spur gear are arranged on the first transmission shaft, and the first bevel gear is meshed with the second bevel gear; the second transmission shaft is pivoted at the middle part of the gearbox housing, the second cylindrical spur gear is arranged on the second transmission shaft, and the second cylindrical spur gear is meshed with the first cylindrical spur gear; the mud and water proof sealing structure is arranged at the lower output end of the gearbox housing, and the second cylindrical spur gear is meshed with the output shaft cylindrical spur gear in the mud and water proof sealing structure.

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