Gear box

Abstract

The utility model discloses a gear box, which comprises a box body, the box cover is connected to the box body, and an inner cavity is formed between the box cover and the box body; the front bearing is connected to the first bearing chamber after the box body and the box cover are combined; the stop structure is arranged on the box body and / or the box cover, is arranged in the inner cavity and is close to or in contact with the front bearing in at least one direction; the at least one blocked stop area is arranged on the front bearing and is close to or in contact with the blocking stop structure; the blocking and stopping structure and the blocked and stopped area interact with each other, and the front bearing is blocked and stopped; therefore, the technical problems of friction loss and noise caused by rotational friction between the front bearing and the box body as well as between the front bearing and the box cover are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of dual-output shaft speed reduction equipment, in particular to a gear box. Background Art

[0002] Gearbox is an important component commonly used in mechanical transmission. It has the function of reducing speed and increasing output torque. It is widely used in many fields, such as: food mixing;

[0003] The structure of a traditional gearbox generally includes: a box body; a box cover connected to the box body and having an inner cavity between the box body and the box body; a front bearing (at the power output end) connected between the box body and the box cover; a rear bearing (at the power input end) connected between the box body and the box cover and spaced apart from the front bearing; a driving shaft connected to the front bearing at one end and to the rear bearing at the other end; a driven shaft connected to the box body; and a gear part arranged in the inner cavity and connecting the driving shaft and the driven shaft parts;

[0004] When the driving shaft rotates, the driven shaft part rotates through the gear part;

[0005] When the driving shaft rotates (the other end of the driving shaft is connected to the motor, so the rear bearing is the power input end), friction is generated between the front bearing (at the power output end), causing the front bearing to rotate with it. Rotational friction is generated between the front bearing and the housing and cover, which not only causes wear but also generates noise, reducing the service life of the gearbox. Utility Model Content

[0006] In view of the above-mentioned deficiencies existing in the related art, an object is to provide a gear box to solve the technical problems in the related art of rotational friction between the front bearing and the box body and the box cover, resulting in wear and noise.

[0007] The technical solution to achieve the purpose is: a gearbox, comprising: a box body; a box cover connected to the box body and having an inner cavity between the box body and the box body; and a front bearing connected to the first bearing chamber after the box body and the box cover are combined; and further comprising:

[0008] A blocking and stopping structure is arranged on the box body and / or the box cover, is arranged in the inner cavity, and is close to or contacts the front bearing from at least one direction;

[0009] and at least one blocked stop area, disposed on the front bearing, close to or in contact with the blocking stop structure;

[0010] The blocking and stopping structure interacts with the blocked and stopped area, and the front bearing is blocked and stopped.

[0011] Further: the front bearing includes: a bearing body, which is a tubular structure, connected to the first bearing chamber; and a protruding block, connected to one end of the bearing body, protruding out of the first bearing chamber, and arranged in the inner cavity, and the outer edge of the protruding block has the blocked stop area.

[0012] Further: a through hole is provided in the middle of the protruding block, and the through hole is connected to the bearing body;

[0013] The blocked stop area on the edge of the protruding block includes: at least one first plane.

[0014] Furthermore: the number of the first planes is four, the first planes are evenly distributed with the center of the through hole as the center, and the first planes are transitioned by rounded corners.

[0015] Further: the blocking and stopping structure includes: at least one stopping portion, arranged on the box body or the box cover, arranged in the inner cavity, close to or in contact with the first plane.

[0016] Further: the number of the stopper is two, one is arranged on the box body, and the other is arranged on the box cover;

[0017] Each of the stop portions has at least one second plane, and one of the second planes is close to or in contact with one of the first planes.

[0018] Further: the number of the stoppers is four, two in a group;

[0019] One group of the stoppers is arranged on the box body, and another group of the stoppers is arranged on the box cover;

[0020] Each of the stoppers has at least one third plane, and one of the third planes is close to or in contact with one of the first planes;

[0021] The four third planes are close to or in contact with the two first planes.

[0022] Further: it also includes: a rear bearing, connected to the second bearing chamber after the box body and the box cover are combined, and spaced apart from the front bearing; a direct drive shaft assembly, passing through the inner cavity, one end connected to the front bearing, the other end connected to the rear bearing, and the other end of the direct drive shaft assembly protruding out of the second bearing chamber; and a speed change output shaft assembly, connected to the third bearing chamber on the box body, one end meshing with the direct drive shaft assembly, and the other end passing through the third bearing chamber.

[0023] Further: the direct drive shaft assembly includes: a first bevel gear portion, which is plugged into the front bearing; and a direct drive shaft, one end of which is plugged into the first bevel gear portion, and the other end is connected to the rear bearing and protrudes out of the second bearing chamber.

[0024] Further: the first bevel gear portion includes: a first center shaft, an outer edge of one end of which is plugged into the front bearing, and the other end is plugged into the direct drive shaft through an internal tooth hole, and one end of the first center shaft has a square hole, and the square hole is connected to the internal tooth hole; a first umbrella-shaped protrusion, connected to the other end of the first center shaft, the outer diameter of the first umbrella-shaped protrusion is larger than the outer diameter of the first center shaft; and a plurality of first protruding teeth, evenly distributed on the first umbrella-shaped protrusion.

[0025] Further: the speed change output shaft assembly includes: a bearing, connected to the third bearing chamber, and one end of the bearing protrudes from the third bearing chamber and is arranged in the inner cavity; a second bevel gear portion, one end of which is meshed with the direct drive shaft assembly, and the other end passes through the bearing and protrudes from the third bearing chamber; a washer, which is sleeved on the other end of the second bevel gear portion and contacts the bearing; and a limit member, which is connected to the second bevel gear portion and presses the washer.

[0026] Further: the second bevel gear portion includes: a second center shaft, connected to the bearing, and one end of the second center shaft is arranged in the inner cavity, and the other end passes through the bearing, protrudes out of the third bearing chamber, and is connected to the limit member; a second umbrella-shaped protrusion, connected to one end of the second center shaft, in contact with the bearing, the outer diameter of the second umbrella-shaped protrusion is larger than the outer diameter of the second center shaft; and a plurality of second convex teeth, evenly distributed on the second umbrella-shaped protrusion, meshing with the first convex teeth.

[0027] Furthermore: the maximum outer diameter dimension A of the second central axis is 0.3-0.4 times the length dimension B of the bearing.

[0028] The adoption of the above technical scheme has the following beneficial effects: a gear box, compared with the related art, is provided with a blocking and stopping structure and a blocked and stopping area; the blocking and stopping structure is arranged on the box body and / or the box cover, and is arranged in the inner cavity; the blocked and stopping area is arranged on the front bearing; the blocking and stopping structure approaches or contacts the blocked and stopping area from at least one direction, forming a blockage for the blocked and stopping area, and the blocking and stopping structure interacts with the blocked and stopping area, so that the front bearing is positioned and will not rotate, and the front bearing will not generate rotational friction with the box body and the box cover, thereby reducing wear and reducing noise; thereby overcoming the technical problem of rotational friction, wear and noise generated between the front bearing and the box body and the box cover, achieving the technical effect of no rotational friction, reduced wear and reduced noise, and having practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is one of the partial cross-sectional views of the gearbox;

[0030] Figure 2 This is the second partial cross-sectional view of the gear box;

[0031] Figure 3 It is a partial cross-sectional view of the box body, box cover, front bearing, rear bearing and bearing assembly;

[0032] Figure 4 This is the exploded view of the gearbox;

[0033] Figure 5 Schematic diagram of the structure with the cover of the gear box opened;

[0034] Figure 6 for Figure 5 Schematic diagram of the structure after installing the box cover;

[0035] Figure 7 An exploded view of the front bearing, rear bearing and direct drive shaft assembly;

[0036] Figure 8 is a partial cross-sectional view of the first bevel gear portion;

[0037] Fig. 9 It is a schematic diagram of the structure in which the direct drive shaft assembly is meshed with the second bevel gear portion;

[0038] Fig.10 The exploded view of the speed change output shaft assembly;

[0039] Fig.11 A partial cross-sectional view of the assembly of the bearing and the second bevel gear portion onto the housing;

[0040] In the figure: 10. Box body, 10-1. Inner cavity, 10-2. First bearing chamber, 10-3. Second bearing chamber, 20. Box cover, 30. Front bearing, 31. Bearing body, 32. Protruding block, 32-1. Through hole, 32-2. First plane, 32-3. Fillet, 40. Stopper, 50. Second plane, 51. Third plane, 60. Rear bearing, 70. Direct drive shaft assembly, 71. First bevel gear part, 71-1. First center shaft, 71-11. Inner tooth hole, 71-12. Square hole, 71-2. First umbrella-shaped protrusion, 71-3. First convex tooth, 72. Direct drive shaft, 80. Speed ​​change output shaft assembly, 81. Third bearing chamber, 82. Bearing, 83. Second bevel gear part, 83-1. Second center shaft, 83-2. Second umbrella-shaped protrusion, 83-3. Second convex tooth, 84. Washer, 85. Limiting member. DETAILED DESCRIPTION

[0041] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings;

[0042] A gearbox solves the technical problems of rotational friction, wear and noise between the front bearing and the box body and the box cover in the related art. It can be manufactured and used, and achieves the positive effects of no rotational friction, reduced wear and noise. The overall idea is as follows:

[0043] One implementation method:

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown; a gearbox, comprising: a box body 10; a box cover 20, connected to the box body 10, with an inner cavity 10-1 between the box body 10; and a front bearing 30, connected to the first bearing chamber 10-2 after the box body 10 and the box cover 20 are combined; characterized in that it also includes:

[0045] A blocking structure is arranged on the box body 10 and / or the box cover 20, is arranged in the inner cavity 10-1, and is close to or contacts the front bearing 30 from at least one direction;

[0046] and at least one blocked stop area, disposed on the front bearing 30, close to or in contact with the blocking stop structure;

[0047] The blocking and stopping structure interacts with the blocked and stopped area, and the front bearing 30 is blocked and stopped;

[0048] Specifically, during implementation, a blocking and stopping structure and a blocked and stopping area are provided; the blocking and stopping structure is provided on the box body 10 and / or the box cover 20, and is provided in the inner cavity 10-1; the blocked and stopping area is provided on the front bearing 30; the blocking and stopping structure approaches or contacts (the approach here is interpreted as approaching, for example: the gap between the two is about 0.1mm) the blocked and stopping area from at least one direction, forming a block for the blocked and stopping area, and the blocking and stopping structure interacts with the blocked and stopping area, so that the front bearing 30 is positioned and does not rotate, and the front bearing 30 does not generate rotational friction with the box body 10 and the box cover 20, thereby reducing wear and reducing noise;

[0049] Another embodiment:

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown; when implemented, the front bearing 30 includes: a bearing body 31, which is a cylindrical structure, connected to the first bearing chamber 10-2; and a protruding block 32, which is connected to one end of the bearing body 31, protrudes from the first bearing chamber 10-2, and is arranged in the inner cavity 10-1, and the outer edge of the protruding block 32 has the blocked stop area;

[0051] The middle position of the protruding block 32 has a through hole 32 - 1 , and the through hole 32 - 1 is connected to the bearing body 31 , so as to facilitate plugging with the first central shaft 71 - 1 on the first bevel gear part 71 ;

[0052] The blocked stop area on the edge of the protruding block 32 includes: at least one first plane 32-2; the number of the first planes 32-2 is four, the first planes 32-2 are centered on the center of the through hole 32-1, are evenly distributed, and the first planes 32-2 are transitioned by rounded corners 32-3; the first planes 32-2 are provided, which is conducive to being blocked and stopped by the stopper 40; the rounded corners 32-3 are provided, the appearance is relatively beautiful, and will not affect the stopper 40 from approaching or contacting the first plane 32-2;

[0053] The bearing body 31 and the protruding block 32 are integrally formed by powder metallurgy and are oil-immersed for lubrication. The cost is relatively low and the assembly is relatively convenient. The structural strength is ensured and the working conditions of low speed and heavy load can be well met.

[0054] The blocking and stopping structure includes: at least one stopping portion 40, which is arranged on the box body 10 or the box cover 20, arranged in the inner cavity 10-1, close to or in contact with the first plane 32-2;

[0055] The stopper 40 is generally a block-shaped structure and is disposed along the inner wall of the box body 10 or the box cover 20;

[0056] There are two stoppers 40, one is arranged on the box body 10, and the other is arranged on the box cover 20; each of the stoppers 40 has at least one second plane 50, and one of the second planes 50 is close to or in contact with one of the first planes 32-2; the two second planes 50 are arranged opposite to each other, the second plane 50 on the box body 10 is close to or in contact with one of the first planes 32-2 from bottom to top, and the second plane 50 on the box cover 20 is close to or in contact with another first plane 32-2 from top to bottom;

[0057] There are four stoppers 40, two of which form a group; one group of stoppers 40 is arranged on the box body 10, and the other group of stoppers 40 is arranged on the box cover 20; each stopper 40 has at least one third plane 51, and one third plane 51 is close to or in contact with one first plane 32-2; four third planes 51 are close to or in contact with two first planes 32-2; the two third planes 51 on the box body 10 are symmetrically arranged on both sides of the protruding block 32, and are close to or in contact with the first plane 32-2 from the left and right directions respectively; the two third planes 51 on the box cover 20 are symmetrically arranged on both sides of the protruding block 32, and are close to or in contact with the first plane 32-2 from the left and right directions respectively;

[0058] By providing the stopper 40, a block is formed at the first plane 32-2 on the front bearing 30, so that the front bearing 30 is positioned and does not rotate, and the front bearing 30 does not generate rotational friction with the box body 10 and the box cover 20, thereby reducing wear and noise;

[0059] Another embodiment:

[0060] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown; when implemented, it also includes: a rear bearing 60, connected to the second bearing chamber 10-3 after the box body 10 and the box cover 20 are combined, and is spaced from the front bearing 30; a direct drive shaft assembly 70, passing through the inner cavity 10-1, one end of which is connected to the front bearing 30, and the other end of which is connected to the rear bearing 60, and the other end of the direct drive shaft assembly 70 protrudes from the second bearing chamber 10-3; and a speed change output shaft assembly 80, connected to the third bearing chamber 81 on the box body 10, one end of which is meshed with the direct drive shaft assembly 70, and the other end of which passes through the third bearing chamber 81;

[0061] The box body 10 and the box cover 20 are connected by bolts to form an inner cavity 10-1, which is conducive to connecting and arranging the stopper 40, the second stopper 50, the direct drive shaft assembly 70 and the speed change output shaft assembly 80;

[0062] The first bearing chamber 10-2 is provided, which is conducive to connecting the front bearing 30 and is relatively convenient for assembly;

[0063] The second bearing chamber 10-3 is provided, which is conducive to connecting the rear bearing 60 and is relatively convenient for assembly;

[0064] The rear bearing 60 has a "T"-shaped structure, is formed by powder metallurgy, and is oil-immersed and lubricated. It has a relatively low cost and is relatively easy to assemble. It ensures structural strength and can well meet the requirements of low-speed and heavy-load working conditions.

[0065] The direct drive shaft assembly 70 includes: a first bevel gear portion 71 plugged into the front bearing 30; and a direct drive shaft 72, one end of which is plugged into the first bevel gear portion 71, and the other end is connected to the rear bearing 60, protruding out of the second bearing chamber 10-3;

[0066] The first bevel gear part 71 comprises: a first central shaft 71-1, one end of which is plugged into the front bearing 30 at its outer edge, and the other end of which is plugged into the direct drive shaft 72 through an inner tooth hole 71-11, and one end of the first central shaft 71-1 is provided with a square hole 71-12, the square hole 71-12 is communicated with the inner tooth hole 71-11; a first umbrella-shaped convex block 71-2, connected to the other end of the first central shaft 71-1, the outer diameter of the first umbrella-shaped convex block 71-2 is larger than the outer diameter of the first central shaft 71-1; and a plurality of first convex teeth 71-3, uniformly distributed on the first umbrella-shaped convex block 71-2;

[0067] A first bevel gear portion 71 is provided. As the direct drive shaft 72 rotates, the first bevel gear portion 71 rotates together, thereby linking the speed change output shaft assembly 80 to rotate, thereby achieving the purpose of speed reduction (speed reduction is achieved through the meshing of the first bevel gear portion 71 and the second bevel gear portion 83);

[0068] An inner tooth hole 71-11 is provided, and the inner teeth are straight teeth, which are interference fit with the direct drive shaft 72, and the reliability of the connection is good;

[0069] The direct drive shaft 72 is a stepped shaft, and the direct drive shaft 72 is connected to the motor. Therefore, the rear bearing 60 is the power input end, and the motor drives the direct drive shaft 72 to rotate, thereby realizing direct drive (direct drive means that the direct drive shaft 72 directly drives the vehicle, for example, an external shaft is connected at the square hole 71-12, thereby realizing direct drive without changing the speed);

[0070] The speed change output shaft assembly 80 includes: a bearing 82, connected to the third bearing chamber 81, and one end of the bearing 82 protrudes from the third bearing chamber 81, and is disposed in the inner cavity 10-1; a second bevel gear portion 83, one end of which is meshed with the direct drive shaft assembly 70, and the other end of which passes through the bearing 82 and protrudes from the third bearing chamber 81; a washer 84, which is sleeved on the other end of the second bevel gear portion 83 and contacts the bearing 82; and a stopper 85, which is connected to the second bevel gear portion 83 and presses the washer 84;

[0071] The bearing 82 has a "T"-shaped structure and is formed by powder metallurgy, which has relatively low cost, is relatively easy to assemble, and ensures structural strength;

[0072] The maximum outer diameter dimension A of the second central shaft 83-1 is 0.3-0.4 times the length dimension B of the bearing 82; the control of the dimension ensures the reliability of the structure and can meet the working conditions of low speed and heavy load;

[0073] The second bevel gear part 83 includes: a second central shaft 83-1, connected to the bearing 82, and one end of the second central shaft 83-1 is arranged in the inner cavity 10-1, and the other end passes through the bearing 82, protrudes from the third bearing chamber 81, and is connected to the stopper 85; a second umbrella-shaped protrusion 83-2, connected to one end of the second central shaft 83-1, in contact with the bearing 82, and the outer diameter of the second umbrella-shaped protrusion 83-2 is larger than the outer diameter of the second central shaft 83-1; and a plurality of second convex teeth 83-3, evenly distributed on the second umbrella-shaped protrusion 83-2, meshing with the first convex teeth 71-3;

[0074] The second central shaft 83-1 is a stepped shaft; the purpose of speed reduction is achieved through the meshing of the second convex teeth 83-3 and the first convex teeth 71-3;

[0075] The lower surface of the second umbrella-shaped projection 83-2 is in contact with the bearing 82, which not only can be reliably supported by the bearing 82, but also will not rub against the housing 10, and the reliability of the structure is good;

[0076] The gasket 84 is a circular sheet structure;

[0077] The stopper 85 is a retaining spring connected to the second central shaft 83 - 1 and blocks the washer 84 , so that the second central shaft 83 - 1 , the second umbrella-shaped protrusion 83 - 2 and the bearing 82 can be reliably connected;

[0078] The direct drive shaft assembly 70 is linked to the speed change output shaft assembly 80 to rotate, thereby realizing two output modes, direct drive and reduction. Specifically, the motor is connected to the direct drive shaft 72, and the motor is linked to the direct drive shaft 72 to rotate. The direct drive shaft assembly 70 itself forms a horizontal direct drive mode, and the direct drive shaft assembly 70 is linked to the speed change output shaft assembly 80 to rotate. Through the meshing of the first bevel gear part 71 and the second bevel gear part 83, a longitudinal reduction mode is formed, which has good flexibility in use.

[0079] The working principle is as follows: the blocking and stopping structure is arranged on the box body 10 and / or the box cover 20, and is arranged in the inner cavity 10-1; the blocked and stopping area is arranged on the front bearing 30; the blocking and stopping structure approaches or contacts (the approach here is interpreted as close, for example: the gap between the two is about 0.1mm) the blocked and stopping area from at least one direction, forming a block for the blocked and stopping area, and the blocking and stopping structure interacts with the blocked and stopping area, so that the front bearing 30 is positioned and will not rotate, and the front bearing 30 will not generate rotational friction with the box body 10 and the box cover 20, thereby reducing wear and reducing noise;

[0080] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicating directions or positional relationships are based on the positional relationships described in the drawings and are only for the convenience of description or simplified description, rather than indicating specific directions that must be possessed; the operation process described in the embodiments is not an absolute usage procedure and corresponding adjustments may be made in actual use;

[0081] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the relevant field; the words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation, but indicate the existence of at least one, which needs to be determined according to the content of the embodiment;

[0082] The above is only a preferred specific implementation method, but the protection scope is not limited to it. Any technician familiar with this technical field can make equivalent substitutions or changes based on the technical solutions and inventive concepts within the disclosed technical scope, which should be covered by the protection scope.

Claims

1. A gear box, comprising: A box body (10); a box cover (20) connected to the box body (10) and having an inner cavity (10-1) between the box body (10) and the box cover (20); and a front bearing (30) connected to a first bearing chamber (10-2) after the box body (10) and the box cover (20) are combined; characterized in that it also includes: A blocking and stopping structure, arranged on the box body (10) and / or the box cover (20), arranged in the inner cavity (10-1), and close to or in contact with the front bearing (30) from at least one direction; and at least one blocked stop area, which is arranged on the front bearing (30) and is close to or in contact with the blocking stop structure; The blocking and stopping structure interacts with the blocked and stopped area, and the front bearing (30) is blocked and stopped.

2. A gearbox according to claim 1, characterized in that: The front bearing (30) comprises: a bearing body (31) which is a circular tubular structure and is connected to the first bearing chamber (10-2); and a protruding block (32) which is connected to one end of the bearing body (31), protrudes out of the first bearing chamber (10-2), and is arranged in the inner cavity (10-1); the blocked stop area is provided on the outer edge of the protruding block (32).

3. A gearbox according to claim 2, characterized in that: A through hole (32-1) is provided at a middle position of the protruding block (32), and the through hole (32-1) is connected to the bearing body (31); The blocked stop area on the edge of the protruding block (32) comprises: at least one first plane (32-2).

4. A gear box according to claim 3, characterized in that: The number of the first planes (32-2) is four, the first planes (32-2) are evenly distributed with the center of the through hole (32-1) as the center, and the first planes (32-2) are transitioned by rounded corners (32-3).

5. A gear box according to claim 3 or 4, characterized in that: The blocking and stopping structure comprises: at least one stopping portion (40), which is arranged on the box body (10) or the box cover (20), arranged in the inner cavity (10-1), and is close to or in contact with the first plane (32-2).

6. A gear box according to claim 5, characterized in that: The number of the stoppers (40) is two, one is arranged on the box body (10), and the other is arranged on the box cover (20); Each of the stop portions (40) has at least one second plane (50), and one of the second planes (50) is close to or in contact with one of the first planes (32-2).

7. A gear box according to claim 5, characterized in that: The number of the stoppers (40) is four, with two forming a group; One group of the stoppers (40) is arranged on the box body (10), and another group of the stoppers (40) is arranged on the box cover (20); Each of the stop portions (40) has at least one third plane (51), and one of the third planes (51) is close to or in contact with one of the first planes (32-2); The four third planes (51) are close to or in contact with the two first planes (32-2).

8. The gear box according to claim 1, characterized in that: Also includes: A rear bearing (60) is connected to a second bearing chamber (10-3) after the housing (10) and the housing cover (20) are combined, and is spaced apart from the front bearing (30); a direct drive shaft assembly (70) is passed through the inner cavity (10-1), one end of which is connected to the front bearing (30) and the other end of which is connected to the rear bearing (60), and the other end of which protrudes out of the second bearing chamber (10-3); and a speed change output shaft assembly (80) is connected to a third bearing chamber (81) on the housing (10), one end of which is meshed with the direct drive shaft assembly (70) and the other end of which passes through the third bearing chamber (81).

9. A gear box according to claim 8, characterized in that: The direct drive shaft assembly (70) comprises: a first bevel gear portion (71) plugged into the front bearing (30); and a direct drive shaft (72) one end of which is plugged into the first bevel gear portion (71) and the other end of which is connected to the rear bearing (60) and protrudes out of the second bearing chamber (10-3).

10. A gear box according to claim 9, characterized in that: The first bevel gear part (71) comprises: a first central shaft (71-1), the outer edge of one end of which is plugged into the front bearing (30), and the other end of which is plugged into the direct drive shaft (72) through an inner tooth hole (71-11), and one end of the first central shaft (71-1) is provided with a square hole (71-12), the square hole (71-12) being connected to the inner tooth hole (71-11); a first umbrella-shaped protrusion (71-2) connected to the other end of the first central shaft (71-1), the outer diameter of the first umbrella-shaped protrusion (71-2) being larger than the outer diameter of the first central shaft (71-1); and a plurality of first protruding teeth (71-3) evenly distributed on the first umbrella-shaped protrusion (71-2).

11. A gear box according to claim 10, characterized in that: The speed change output shaft assembly (80) comprises: a bearing (82) connected to the third bearing chamber (81), one end of the bearing (82) protruding from the third bearing chamber (81) and arranged in the inner cavity (10-1); a second bevel gear portion (83) having one end meshing with the direct drive shaft assembly (70) and the other end passing through the bearing (82) and protruding from the third bearing chamber (81); a washer (84) sleeved on the other end of the second bevel gear portion (83) and contacting the bearing (82); and a stopper (85) connected to the second bevel gear portion (83) and pressing the washer (84).

12. A gear box according to claim 11, characterized in that: The second bevel gear portion (83) comprises: a second central shaft (83-1) connected to the bearing (82), one end of the second central shaft (83-1) being arranged in the inner cavity (10-1), and the other end passing through the bearing (82), protruding out of the third bearing chamber (81), and connected to the stopper (85); a second umbrella-shaped protrusion (83-2) connected to one end of the second central shaft (83-1) and in contact with the bearing (82), the outer diameter of the second umbrella-shaped protrusion (83-2) being larger than the outer diameter of the second central shaft (83-1); and a plurality of second protruding teeth (83-3) evenly distributed on the second umbrella-shaped protrusion (83-2) and meshing with the first protruding teeth (71-3).

13. A gear box according to claim 12, characterized in that: The maximum outer diameter dimension A of the second central axis (83-1) is 0.3-0.4 times the length dimension B of the bearing (82).

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