CN221075111U

CN221075111U - Two-gear power transmission speed reducer for power rake

Info

Publication number: CN221075111U
Application number: CN202323061116.XU
Authority: CN
Inventors: 任中海
Original assignee: Ningbo Tuoke Transmission Co ltd
Current assignee: Ningbo Tuoke Transmission Co ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2024-06-04
Anticipated expiration: 2033-11-14

Abstract

The utility model provides a two-gear power transmission speed reducer for a power rake, which comprises a base (46), a spiral umbrella transmission box body (32), a front box body (23) and a rear box body (9), wherein the spiral umbrella transmission box body (32) is arranged on the base (46), the front box body (23) is arranged on the spiral umbrella transmission box body (32), and the front box body (23) is connected with the rear box body (9). The front box body (23) and the rear box body (9) are provided with a first transmission shaft (24), and the spiral umbrella transmission box body (32) is provided with a second transmission shaft (33). The meshing gear does not move in the meshing state all the time in the running process of the device, the gear shifting action is realized through the spline hub and the combining sleeve, and the combining sleeve axially moves to be matched with an external spline of the meshing gear, so that the tooth surface of the meshing transmission gear is not damaged. The gear transmission of the first shaft and the second shaft of the product can be conveniently designed into helical gear transmission, and the meshing precision of the gear transmission is improved while the meshing contact ratio of the gears is improved.

Description

Two-gear power transmission speed reducer for power rake

Technical Field

The utility model belongs to the technical field of agricultural machinery, and particularly relates to a two-gear power transmission speed reducer for a power rake.

Background

The working power source of the power rake is mainly that the power of the transfer case of the agricultural tractor is input to the speed reducer related to the utility model, and then the final power output shaft of the speed reducer drives the power rake to carry out agricultural operation. The hardness of the soil quality of the working environment of the power rake is greatly affected by regions. Different soil qualities, the power harrow needs to adopt different speeds to work to shorten operating time, improve work efficiency. In addition, the driving gear in the prior art is often required to be designed into an integral double gear, the double gear can only be designed into a straight gear transmission, the gear is difficult to carry out secondary finishing after heat treatment, and the heat treatment level directly determines the gear tooth precision of the gear transmission.

Disclosure of utility model

First, the technical problem to be solved

The utility model aims to solve the technical problem of providing a two-gear power transmission speed reducer for a power rake, wherein driving and driven working gears of different gears are always in a meshed state, and the meshing state of the gears is not required to be switched in the gear shifting process

(II) technical scheme

In order to solve the technical problems, the utility model adopts the following technical scheme:

a two-gear power transmission speed reducer for a power rake comprises a speed reducer shell; a first transmission shaft and a second transmission shaft which are approximately parallel are arranged in the speed reducer shell; a second-gear driving gear, a spline hub and a first-gear driving gear are sequentially arranged on the first transmission shaft from left to right, a combination sleeve capable of sliding left and right along an axis is arranged on the spline hub, and a first-gear driving gear external spline and a second-gear driving gear external spline are respectively arranged on the first-gear driving gear and the second-gear driving gear; the combination sleeve is matched with the external spline of the first-gear driving gear or the external spline of the second-gear driving gear so that power is transmitted to the first-gear driving gear or the second-gear driving gear through the spline hub; one side of the first transmission shaft is provided with a movable shifting fork connecting rod; the shifting fork connecting rod is provided with a shifting fork for pushing the combination sleeve to slide left and right;

The second transmission shaft is sequentially provided with a second-gear driven gear, a first-gear driven gear and a driving spiral bevel gear; the second-gear driving gear is meshed with the second-gear driven gear, the first-gear driving gear is meshed with the first-gear driven gear, and a driven spiral bevel gear meshed with the driving spiral bevel gear (53) for transmission is arranged on one side of the driving spiral bevel gear; the driven spiral bevel gear is provided with a power output connecting part.

According to the technical scheme, the gear shifting fork is arranged to push the combining sleeve to be connected with the first-gear driving gear or the second-gear driving gear, so that power output of two-gear rotating speeds is realized.

In a further technical scheme, a first needle bearing is arranged on the inner ring of the first-gear driving gear, and a second needle bearing is arranged on the inner ring of the second-gear driving gear.

According to the technical scheme, the first needle roller bearing and the second needle roller bearing are arranged, so that when any gear driving gear is connected with the combination sleeve in the meshed state, the rotation speed of the driving gear which is not connected with the other gear is consistent with that of the driving gear which is not connected with the other gear.

In a further technical scheme, the combination sleeve is provided with an internal spline, and the spline hub is provided with an external spline; when the internal spline of the combination sleeve and the external spline of the spline hub are completely centered, the internal spline teeth of the combination sleeve, the external spline teeth of the first-gear driving gear and the external spline teeth of the second-gear driving gear are separated at the same time, and at the moment, the power of the first transmission shaft cannot be output to the first-gear driving gear and the second-gear driving gear, and at the moment, the speed reducer is in a neutral state.

According to the technical scheme, the power rake is in a neutral state, and free separation from a power shaft of the power output tractor can be conveniently realized when the power rake is jammed and other faults occur.

In a further technical scheme, the second-gear driven gear inner hole is provided with inner spline teeth and is connected with outer spline teeth of the outer diameter of the second transmission shaft in a matched mode, the first-gear driven gear inner hole is provided with inner spline teeth and is connected with outer spline teeth of the second transmission shaft in a matched mode, an adjusting sleeve is arranged between the first-gear driven gear and the second-gear driven gear, and the inner hole of the adjusting sleeve is sleeved on the outer spline large diameter of the second transmission shaft.

In the technical scheme, the external spline teeth are arranged on the external diameter of the second transmission shaft to ensure that the first-gear driven wheel and the second-gear driven wheel which are matched keep the same rotating speed; the distance between the first gear driven gear and the second gear driven gear is changed according to the length of the adjusting sleeve, and the length of the adjusting sleeve is adjusted according to the distance between the first gear driving gear and the second gear driving gear on the first transmission shaft, so that the driving driven gear is guaranteed to be meshed all the time.

In a further technical scheme, the first-gear driving gear, the second-gear driving gear, the first-gear driven gear and the second-gear driven gear are helical gears.

In the technical scheme, the helical gear can be subjected to secondary finish machining after heat treatment, and the high-precision helical gear transmission improves the meshing precision of the gear transmission while improving the meshing contact ratio of the gears, so that the working noise of the speed reducer is reduced, and the working life of the speed reducer is prolonged.

In a further technical scheme, a shifting fork positioning shaft seat and a shifting fork shaft seat which are oppositely arranged are arranged on the speed reducer shell, and shifting fork connecting rods are arranged in the shifting fork positioning shaft seat and the shifting fork shaft seat and can axially move along the axes of the shifting fork connecting rods;

Three circular arc grooves are arranged on the outer diameter of the shifting fork connecting rod, the three circular arc grooves correspond to two-gear, neutral and first-gear working positions from left to right respectively, a positioning steel ball and a positioning spring are arranged in an inner hole in the vertical direction of the shifting fork positioning shaft seat, the three circular arc grooves of the outer diameter of the shifting fork connecting rod can be automatically centered, the other end of the shifting fork corresponds to the three working positions, the other end of the shifting fork is arranged in a groove of a combining sleeve, the combining sleeve is driven by the shifting fork to axially move under the condition of being matched with an internal spline and an external spline of a spline hub, the shifting action is completed, a groove is formed in the horizontal inner hole of the shifting fork positioning shaft seat, a first O-shaped ring is installed, the inner diameter of the first O-shaped ring is matched and sealed with the outer diameter of the shifting fork connecting rod, a groove is formed in the outer shaft diameter of the shifting fork positioning shaft seat, a second O-shaped ring is installed to be matched and sealed with the mounting hole of the shifting fork positioning shaft seat, a groove is formed in the outer shaft diameter of the shifting fork shaft seat, and a fourth O-shaped ring is installed to be matched and sealed with the mounting hole of the shifting fork shaft seat.

According to the technical scheme, three arc grooves are formed in the shifting fork connecting rod, so that the gear can be continuously operated after shifting, and the gear jump is avoided; and oil seepage during gear shifting is avoided after the grooves and the O-shaped rings are arranged.

In a further technical scheme, the speed reducer shell comprises a front box body, a rear box body and a spiral bevel transmission box body; the front box body and the rear box body are provided with a first tapered roller bearing, a second tapered roller bearing and a third tapered roller bearing, and the first transmission shaft is arranged in bearing inner rings of the first tapered roller bearing, the second tapered roller bearing and the third tapered roller bearing;

The right side terminal surface of first tapered roller bearing is provided with first adjustment washer, installs first end cover on its right side, installs first skeleton oil blanket in the first end cover hole, first end cover passes through first countersunk head screw fixation on the preceding box, and the faying surface of first end cover and preceding box is provided with the fifth O shape circle, the left side terminal surface of second tapered roller bearing is provided with first hole and uses the retaining ring, and the slot in the bearing chamber hole of preceding box is installed to the retaining ring for the first hole, the second adjustment washer is installed to third tapered roller bearing left side terminal surface, installs the second end cover on its left side, installs the second skeleton oil blanket in the second end cover hole, the second end cover passes through the second countersunk head screw to be fixed on the back box, and the faying surface of second end cover and back box is provided with eleventh O shape circle.

In the technical scheme, after the first transmission shaft is provided with the tapered roller bearing inner ring, the end covers, the check rings and the oil seals are arranged on the end faces of the bearings, so that the circulation and stability of internal lubricating oil can be effectively maintained, and the leakage and pollution of oil liquid are prevented.

In a further technical scheme, a fourth tapered roller bearing, a fifth tapered roller bearing and a sixth tapered roller bearing are respectively arranged on the rear box body, the second transmission shaft is arranged in the bearing inner rings of the fourth tapered roller bearing, the fifth tapered roller bearing and the sixth tapered roller bearing, a third adjusting washer is arranged on the right side end face of the fourth tapered roller bearing, a third end cover is arranged on the right side of the third tapered roller bearing, the third end cover is fixed on the spiral bevel transmission box body through a second inner hexagonal screw, a sixth O-shaped ring is arranged on the combined face of the third end cover and the spiral bevel transmission box body, an oil mark is arranged on the right end face of the third end cover, a fourth adjusting washer is arranged on the left side end face of the fifth tapered roller bearing, a second hole retainer ring is arranged in a groove of the inner hole of the bearing chamber of the spiral bevel transmission box body, a fifth adjusting washer is arranged on the left side end face of the sixth tapered roller bearing, a fourth end cover is arranged on the left side of the fourth end cover, and the fourth end cover is fixed on the rear box body through a third countersunk head screw, and the fourth end cover is combined with the fourth end cover.

In the technical scheme, the oil level of the lubricating oil in the speed reducer is detected and monitored by the oil level indicator, so that a lubricating system of the speed reducer is checked and maintained in a convenient mode.

In a further technical scheme, a fifth sealing cover and a fourth hole retainer ring are arranged in an inner hole at the lower part of the base, a groove is formed in the outer diameter of the fifth sealing cover, an eighth O-shaped ring is arranged on the outer diameter of the fifth sealing cover, a third framework oil seal is arranged in the inner hole of the fifth sealing cover, and the inner diameter of the third framework oil seal is matched with the outer shaft diameter of the driven spiral bevel gear;

The base is provided with a second screw plug, the upper part of the screw umbrella transmission box body is provided with a first screw plug and a first breather valve, the upper part of the front box body is provided with a second breather valve, and the lower part of the rear box body is provided with an inner hexagonal screw plug.

In the technical scheme, the breather valve is arranged on the base, and when the internal air pressure exceeds a certain range, the breather valve can be automatically opened or closed so as to keep the internal air pressure within a normal range. The breather valve can effectively prevent the air pressure change in the inside from adversely affecting the normal operation, and simultaneously can also prevent external substances such as dust, moisture and the like from entering the inside to protect the normal operation of the speed reducer; the service life is prolonged; by adding the O-shaped ring and the gasket at the joint, the overall sealing performance is enhanced, and the problems that the meshing surface is damaged by impurities, oil seeps and the like are solved.

In a further technical scheme, an inner hole of the driving spiral bevel gear is provided with inner spline teeth which are connected with outer spline teeth of the second transmission shaft in a matched mode, the outer shaft diameter of the driving spiral bevel gear is arranged in an inner ring hole of the fifth tapered roller bearing, the left end face of the driving spiral bevel gear is positioned in contact with the right end face of the first-gear driven gear, and the right end face of the driving spiral bevel gear is positioned in contact with a shoulder of the second transmission shaft;

The inner hole at the lower part of the driven spiral bevel gear is provided with an inner spline tooth which is used for power output connection, an EG oil seal and a check ring for a third hole are installed in the inner hole at the upper part of the driven spiral bevel gear, the check ring for the third hole is installed in a groove at the upper part of the driven spiral bevel gear, a groove is formed in the outer shaft diameter at the lower part of the driven spiral bevel gear, a check ring for a shaft is installed, and a sixth adjusting washer is arranged between the check ring for the shaft and an eighth tapered roller bearing.

Further, a two keeps off power transmission speed reducer for power rake, including base, spiral shell umbrella transmission box, preceding box, back box, the spiral shell umbrella transmission box is installed through fourth hexagon socket head cap screw, double-deck auto-lock packing ring and first locating pin rigid mounting in base upper portion, and base and spiral shell umbrella transmission box faying surface are provided with seventh O shape circle, and spiral shell umbrella transmission box left side is provided with preceding box through third hexagon socket head cap screw and second locating pin rigid mounting, and spiral shell umbrella transmission box and preceding box faying surface are provided with ninth O shape circle, and preceding box and back box are provided with third O shape circle through first hexagon socket head cap screw and third locating pin rigid connection, preceding box and back box faying surface. The front box body, the rear box body and the spiral bevel gear box body are respectively provided with a first transmission shaft and a second transmission shaft, the first transmission shaft is sequentially provided with a second gear driving gear, a spline hub and a first gear driving gear from left to right, the second transmission shaft is sequentially provided with a second gear driven gear, an adjusting sleeve, a first gear driven gear and a driving bevel gear from left to right, the base is provided with a seventh tapered roller bearing and an eighth tapered roller bearing, driven bevel gears are arranged in bearing inner rings of the seventh tapered roller bearing and the eighth tapered roller bearing, the second gear driving gear and the second gear driven gear are in meshed transmission, the first gear driving gear and the first gear driven gear are in meshed transmission, the rear box body is provided with a shifting fork positioning shaft seat, shifting fork connecting rods are arranged in seat holes of the shifting fork positioning shaft seat and the shifting fork shaft seat, and the shifting fork connecting rods can axially move along the axis.

According to the technical scheme, the adjusting sleeve is arranged between the first-gear driven gear and the second-gear driven gear, the length of the adjusting sleeve changes according to the distance between the first-gear driving gear and the second-gear driving gear, and the driven gear is guaranteed to be meshed with the driving gear.

Further, a second roller bearing is installed in an inner hole of the second-gear driving gear, the inner diameter of the second roller bearing is matched with the outer diameter of the first transmission shaft, a first roller bearing is installed in the inner hole of the first-gear driving gear, the inner diameter of the first roller bearing is matched with the outer diameter of the first transmission shaft, a thrust needle bearing is installed in the inner hole on the right side of the second-gear driving gear, the inner hole of the second-gear driving gear is installed on the outer diameter of the first transmission shaft, the right side end face of the thrust needle bearing is positioned in contact with the left end face of the spline hub, the left end of the first-gear driving gear is provided with external spline teeth, the right end face of the second-gear driving gear is provided with internal spline teeth, the internal spline teeth of the second-gear driving gear are matched and connected with the external spline teeth arranged on the first transmission shaft, the external spline teeth of the spline hub are matched with the external spline teeth of the same parameters as the first-gear driving gear and the second-gear driving gear end face, the external spline teeth of the spline hub are matched with the internal spline teeth of a combining sleeve, the combining sleeve is driven to coaxially rotate, the right end face of the first-gear driving gear is installed with a thrust washer, and the right end face of the thrust washer is positioned in contact with the left end face of the bearing of the second-gear driving bearing.

(III) beneficial effects

Compared with the prior art, the two-gear power transmission speed reducer for the power rake has the following advantages.

1. Compared with a common gear shifting device, the gear shifting device of the two-gear power transmission speed reducer for the power rake has the advantages that the meshing gears are not moved in the meshing state all the time in the gear shifting process, the gear shifting device is realized through the spline hub and the combining sleeve, the axial movement of the combining sleeve is matched with the external spline of the meshing gears, and the tooth surfaces of the meshing transmission gears are not damaged

2. The two-gear power transmission speed reducer for the power rake has the advantages that a neutral gear state is added in a first-gear working state and a second-gear working state, so that the power rake can be conveniently separated from a power source and is in a floating state.

3. The two-gear power transmission speed reducer for the power rake has the advantages that the gear transmission of the first transmission shaft and the second transmission shaft is conveniently designed into helical gear transmission, the helical gear can be subjected to secondary finish machining after heat treatment, and the high-precision helical gear transmission improves the meshing precision of the gear transmission while improving the meshing coincidence degree of the gears.

4. The working noise of the speed reducer is reduced, and the working life of the speed reducer is prolonged.

Drawings

FIG. 1 is an isometric view of an apparatus used in an embodiment of the utility model.

Fig. 2 is a perspective assembly view of a device used in an embodiment of the present utility model.

Fig. 3 is a cross-sectional view of a device used in an embodiment of the utility model.

Fig. 4 is a front view of an apparatus used in an embodiment of the present utility model.

Fig. 5 is a left side view of an apparatus used in an embodiment of the present utility model.

Fig. 6 is a right side view of the apparatus used in an embodiment of the present utility model.

Fig. 7 is a top view of an apparatus used in an embodiment of the utility model.

Fig. 8 is a bottom view of an apparatus used in an embodiment of the utility model.

Fig. 9 is a schematic view of a neutral operating position of an apparatus used in an embodiment of the present utility model.

FIG. 10 is a schematic view of a second gear operating position of the apparatus used in an embodiment of the present utility model.

Fig. 11 shows an example of a first gear drive gear of the apparatus used in the embodiment of the present utility model.

Fig. 12 shows an example of a two-gear drive gear of the apparatus used in the embodiment of the present utility model.

Wherein the corresponding part names of the respective reference numerals are: 1. a fork connecting rod; 2. a first O-ring; 3. a shifting fork positioning shaft seat; 4. positioning a steel ball; 5. a positioning spring; 6. a second O-ring; 7. a second gear driving gear; 8. a second needle bearing; 9. a rear case; 10. thrust needle roller bearings; 11. a spline hub; 12. shifting fork; 13. a combining sleeve; 14. a first socket head cap screw; 15. a third O-ring; 16. a first gear driving gear; 17. a fourth O-ring; 18. a shifting fork shaft seat; 19. a first needle bearing; 20. a first hole retainer ring; 21. a thrust washer; 22. a second tapered roller bearing; 23. a front case; 24. a first drive shaft; 25. a first tapered roller bearing; 26. a first countersunk head screw; 27. a fifth O-ring; 28. a first end cap; 29. a first framework oil seal; 30. a first adjustment washer; 31. a first screw plug 32, a screw umbrella drive housing; 33. a second drive shaft; 34. a third hole retainer ring; 35. EG oil seal; 36. driven spiral bevel gears; 37. a fourth tapered roller bearing; 38. a sixth O-ring; 39. a third end cap; 40. a third adjustment washer; 41. a second socket head cap screw; 42. a seventh tapered roller bearing; 43. an eighth tapered roller bearing; 44. a seventh O-ring; 45. a second plug screw; 46. a base; 47. a retainer ring for the shaft; 48. an eighth O-ring; 49. a fourth hole retainer ring; 50. a fifth end cap; 51. a third framework oil seal; 52. a sixth adjustment washer; 53. a driving spiral bevel gear; 54. a first positioning pin; 55. a fifth tapered roller bearing; 56. a ninth O-ring; 57. a third socket head cap screw; 58. a second hole retainer ring; 59. a first-gear driven gear; 60. a hexagonal socket; 61. adjusting the sleeve; 62. a second-gear driven gear; 63. a third countersunk head screw; 64. a tenth O-ring; 65. a fifth adjustment washer; 66. a fourth end cap; 67. a sixth tapered roller bearing; 68. a fourth adjustment washer; 69. a second positioning pin; 70. a second countersunk head screw; 71. a second end cap; 72. a second framework oil seal; 73. a third tapered roller bearing; 74. a second adjustment washer; 75. an eleventh O-ring; 76. a fourth socket head cap screw; 77. double-stack self-locking washers; 78. a first breather valve; 79. an oil level; 80. a second breather valve; 81. and a third locating pin.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples serve to illustrate the utility model; but are not intended to limit the scope of the utility model.

Example 1:

The integral structure of the two-gear power transmission speed reducer for the power rake is shown in the figure, the integral structure comprises a base 46, a spiral bevel gear box 32, a front box 23 and a rear box 9, wherein the spiral bevel gear box 32 is rigidly arranged at the upper part of the base 46 through a fourth inner hexagon screw 76, a double-stacked self-locking washer 77 and a first positioning pin 54, a seventh O-shaped ring 44 is arranged at the joint surface of the base 46 and the spiral bevel gear box 32, a front box 23 is rigidly arranged at the left side of the spiral bevel gear box 32 through a third inner hexagon screw 57 and a second positioning pin 69, a ninth O-shaped ring 56 is arranged at the joint surface of the spiral bevel gear box 32 and the front box 23, the front box 23 and the rear box 9 are rigidly connected through a first inner hexagon screw 14 and a third positioning pin 81, the junction of the front case 23 and the rear case 46 is provided with a third O-ring 15. The front box body 23, the rear box body 9 and the spiral bevel gear box body 32 are respectively provided with a first transmission shaft 24 and a second transmission shaft 33, the first transmission shaft 24 is provided with a second gear driving gear 7, a spline hub 11 and a first gear driving gear 16 in sequence from left to right, the second transmission shaft 33 is provided with a second gear driven gear 62, an adjusting sleeve 61, a first gear driven gear 59 and a driving spiral bevel gear 53 in sequence from left to right, the base 46 is provided with a seventh tapered roller bearing 42 and an eighth tapered roller bearing 43, driven spiral bevel gears 36 are arranged in the bearing inner rings of the seventh tapered roller bearing 42 and the eighth tapered roller bearing 43, the second gear driving gear 7 and the second gear driven gear 62 are meshed for transmission, the first gear driving gear 16 and the first gear driven gear 59 are in meshed transmission, the driving spiral bevel gear 53 and the driven spiral bevel gear 36 are in meshed transmission, the shifting fork positioning shaft seat 3 is arranged on the rear box body 9, the shifting fork shaft seat 18 is arranged on the front box body 23, the shifting fork connecting rod 1 is arranged in the seat holes of the shifting fork positioning shaft seat 3 and the shifting fork shaft seat 18, and the shifting fork connecting rod 1 can axially move along the axis of the shifting fork connecting rod. The front box body 23 and the rear box body 9 are respectively provided with a first tapered roller bearing 25, a second tapered roller bearing 22 and a third tapered roller bearing 73, the first transmission shaft 24 is arranged in the inner rings of the first tapered roller bearing 25, the second tapered roller bearing 22 and the third tapered roller bearing 73, the right end surface of the first tapered roller bearing 25 is provided with a first adjusting washer 30, the right side of the first tapered roller bearing 25 is provided with a first end cover 28, a first framework oil seal 29 is arranged in the inner hole of the first end cover 28, the first end cover 28 is fixed on the front box body 23 through a first countersunk head screw 26, the joint surface of the first end cover 28 and the front box body 23 is provided with a fifth O-shaped ring 27, the left end face of the second tapered roller bearing 22 is provided with a first hole retainer ring 20, the first hole retainer ring 20 is installed in a groove of a bearing chamber inner hole of the front box body 23, the left end face of the third tapered roller bearing 73 is provided with a second adjusting washer 74, the left side of the third tapered roller bearing is provided with a second end cover 71, a second framework oil seal 72 is installed in the inner hole of the second end cover 71, the second end cover 71 is fixed on the rear box body 9 through a second countersunk head screw 70, and an eleventh O-shaped ring 75 is arranged on the joint surface of the second end cover 71 and the rear box body 9. The second roller bearing 22 is arranged in the inner hole of the second gear driving gear 7, the inner diameter of the second roller bearing 22 is matched with the outer diameter of the first transmission shaft 24, the first needle bearing 19 is arranged in the inner hole of the first gear driving gear 16, the inner diameter of the first needle bearing 19 is matched with the outer diameter of the first transmission shaft 24, the thrust needle bearing 10 is arranged in the inner hole on the right side of the second gear driving gear, the inner hole of the thrust needle bearing 10 is arranged on the outer diameter of the first transmission shaft 24, the right side end surface of the thrust needle bearing 10 is positioned in contact with the left end surface of the spline hub 11, the left end of the first gear driving gear 16 is provided with external spline teeth, the inner hole of the spline hub 11 with the same parameters is provided with the external spline teeth on the right end surface of the second gear driving gear 7, the internal spline teeth are matched and connected with external spline teeth arranged on the first transmission shaft 24, the external diameter of the spline hub 11 is provided with external spline teeth with the same parameters as the end surfaces of the first gear driving gear 16 and the second gear driving gear 7, the external spline teeth of the spline hub 11 are matched with the internal spline teeth of the combining sleeve 13 and drive the combining sleeve 13 to coaxially rotate, the right end surface of the first gear driving gear 16 is provided with a thrust washer 21, and the right end surface of the thrust washer 21 is positioned in contact with the left end surface of the bearing inner ring of the second tapered roller bearing 22. The shifting fork 12 is arranged on the shifting fork connecting rod 1, three circular arc grooves are arranged on the outer diameter of the shifting fork connecting rod 1, the three circular arc grooves correspond to the second gear, the neutral gear and the first gear working positions from left to right respectively, a positioning steel ball and a positioning spring are arranged in an inner hole in the vertical direction of the shifting fork positioning shaft seat 3, the three circular arc grooves of the outer diameter of the shifting fork connecting rod 1 can be automatically centered, the other end of the shifting fork 12 corresponds to the three working positions, the other end of the shifting fork 12 is arranged in a groove of the combining sleeve 13, the combining sleeve 13 is driven by the shifting fork 12 to axially move under the condition of being matched with the internal spline and the external spline of the spline hub 11, the shifting action is completed, the grooves are arranged in the horizontal inner hole of the shifting fork positioning shaft seat 3, the first O-shaped ring 2 is installed, the inner diameter of the first O-shaped ring 2 is matched and sealed with the outer diameter of the shifting fork connecting rod 1, a groove is formed in the outer shaft diameter of the shifting fork positioning shaft seat 3, the second O-shaped ring 6 is matched and sealed with the mounting hole of the shifting fork positioning shaft seat 3 on the rear box body 9, a groove is formed in the outer shaft diameter of the shifting fork positioning shaft seat 3, and the fourth O-shaped ring 17 is matched and sealed with the mounting hole of the shifting fork positioning shaft seat 3 on the front box body 23. The fourth tapered roller bearing 37, the fifth tapered roller bearing 55 and the sixth tapered roller bearing 67 are respectively arranged on the spiral bevel transmission box 32 and the rear box 9, the second transmission shaft 33 is arranged in the inner rings of the fourth tapered roller bearing 37, the fifth tapered roller bearing 55 and the sixth tapered roller bearing 67, the right end surface of the fourth tapered roller bearing 37 is provided with a third adjusting washer 40, the right side of the third adjusting washer is provided with a third end cover 39, the third end cover 39 is fixed on the spiral bevel transmission box 32 through a second inner hexagon screw 41, the joint surface of the third end cover 39 and the spiral bevel transmission box 32 is provided with a sixth O-shaped ring 38, the oil pointer 79 is installed on the right end face of the third end cover 39, the fourth adjusting washer 68 is arranged on the left end face of the fifth tapered roller bearing 55, the second hole check ring 58 is arranged on the left side of the fourth adjusting washer 68, the second hole check ring 58 is installed in a groove of the bearing chamber inner hole of the spiral bevel transmission box body 32, the fifth adjusting washer 65 is installed on the left end face of the sixth tapered roller bearing 67, the fourth end cover 66 is installed on the left side of the sixth tapered roller bearing 67, the fourth end cover 66 is fixed on the rear box body 9 through the third countersunk head screw 63, and the tenth O-shaped ring 64 is arranged on the joint surface of the fourth end cover 66 and the rear box body 9. The inner hole of the second-gear driven gear 62 is provided with inner spline teeth which are matched and connected with outer spline teeth of the outer diameter of the second transmission shaft 33, the inner hole of the first-gear driven gear 59 is provided with inner spline teeth which are matched and connected with outer spline teeth of the second transmission shaft 33, an adjusting sleeve 61 is arranged between the first-gear driven gear 59 and the second-gear driven gear 62, and the inner hole of the adjusting sleeve 61 is sleeved on the outer spline large diameter of the second transmission shaft 33. Further, an inner hole of the driving spiral bevel gear 53 is provided with inner spline teeth which are connected with outer spline teeth of the second transmission shaft 33 in a matched mode, the outer shaft diameter of the driving spiral bevel gear 53 is installed in an inner ring hole of the fifth tapered roller bearing 55, the left end face of the driving spiral bevel gear 53 is positioned in a contact mode with the right end face of the first-gear driven gear 59, and the right end face of the driving spiral bevel gear 53 is positioned in a contact mode with the shoulder of the second transmission shaft 33. The lower inner hole of the driven spiral bevel gear 36 is provided with internal spline teeth, as the connection of power output, the EG oil seal 35 and the third hole check ring 34 are installed in the upper inner hole of the driven spiral bevel gear 36, the third hole check ring 34 is installed in the groove of the upper inner hole of the driven spiral bevel gear 36, the groove is arranged on the outer shaft diameter of the lower part of the driven spiral bevel gear 36, the shaft check ring 47 is installed, and the sixth adjusting washer 52 is arranged between the shaft check ring 47 and the eighth tapered roller bearing 43. A fifth end cover 50 and a fourth hole retainer ring 49 are arranged in an inner hole at the lower part of the base, the lower end surface of the fifth end cover 50 is positioned in contact with the upper end surface of the fourth hole retainer ring 49, a groove is arranged on the outer diameter of the fifth end cover 50, an eighth O-shaped ring 48 is arranged on the outer diameter of the fifth end cover 50, a third framework oil seal 51 is arranged in the inner hole of the fifth end cover 50, and the inner diameter of the third framework oil seal 51 is matched with the outer diameter of the driven spiral bevel gear 36. The base 46 is provided with a second screw plug 45, the upper part of the screw umbrella transmission box body 32 is provided with a first screw plug 31 and a first breather valve 78, the upper part of the front box body is provided with a second breather valve 79, and the lower part of the rear box body 9 is provided with an inner hexagonal screw plug 60.

In some embodiments, as shown in fig. 3, 9-10, the first gear drive gear 16, the second gear drive gear 7, the first gear driven gear 59, and the second gear driven gear 62 are helical gears. The spline hub 11 is always meshed with the combining sleeve 13, the axial position of the combining sleeve 13 is adjusted by the gear shifting fork 12 on the shifting fork connecting rod 1 in the gear shifting action of the first gear and the second gear, so that the combining sleeve is respectively matched with external spline teeth on the first gear driving gear 16 and the second gear driving gear 7, and power is respectively transmitted to the first gear driving gear 16 and the second gear driving gear 7 through the spline hub 11 and the combining sleeve 13, so that the flexible switching of the two gear speeds is realized. When the internal spline of the combining sleeve 13 and the external spline of the spline hub 11 are completely centered, the internal spline teeth of the combining sleeve 13, the external spline teeth of the first-gear driving gear 16 and the external spline teeth of the second-gear driving gear 7 are separated simultaneously, at the moment, the power of the first transmission shaft 24 cannot be output to the first-gear driving gear 16 and the second-gear driving gear 7, at the moment, the speed reducer is in a neutral state, and when faults such as jamming and the like occur on a power rake, the free separation of the power shaft of the power output tractor can be conveniently realized.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. A power transmission speed reducer for a power rake is characterized in that: comprises a speed reducer shell; a first transmission shaft (24) and a second transmission shaft (33) which are approximately parallel are arranged in the speed reducer shell; a second-gear driving gear (7), a spline hub (11) and a first-gear driving gear (16) are sequentially arranged on the first transmission shaft (24) from left to right, a combination sleeve (13) capable of sliding left and right along an axis is arranged on the spline hub (11), and a first-gear driving gear (16) and the second-gear driving gear (7) are respectively provided with a first-gear driving gear (16) external spline and a second-gear driving gear (7) external spline; the combination sleeve (13) is matched with an external spline of the first-gear driving gear (16) or an external spline of the second-gear driving gear (7) so that power is transmitted to the first-gear driving gear (16) or the second-gear driving gear (7) through the spline hub (11); one side of the first transmission shaft (24) is provided with a movable shifting fork connecting rod (1); the shifting fork connecting rod (1) is provided with a shifting fork (12) for pushing the combining sleeve (13) to slide left and right;

The second transmission shaft (33) is sequentially provided with a second-gear driven gear (62), a first-gear driven gear (59) and a driving spiral bevel gear (53); the second-gear driving gear (7) is meshed with the second-gear driven gear (62), the first-gear driving gear (16) is meshed with the first-gear driven gear (59), and a driven spiral bevel gear which is meshed with the driving spiral bevel gear (53) for transmission is arranged on one side of the driving spiral bevel gear (53); the driven spiral bevel gear is provided with a power output connecting part.

2. The two-speed power transmission reducer for a power rake according to claim 1, wherein: the inner ring of the first-gear driving gear (16) is provided with a first needle bearing (19), and the inner ring of the second-gear driving gear (7) is provided with a second needle bearing (8).

3. The two-stage power transmission speed reducer for a power rake according to claim 2, wherein: the combination sleeve (13) is provided with an internal spline, and the spline hub (11) is provided with an external spline; when the internal spline of the combination sleeve (13) and the external spline of the spline hub (11) are completely centered, the internal spline of the combination sleeve (13), the external spline of the first-gear driving gear (16) and the external spline teeth of the second-gear driving gear (7) are simultaneously separated, at the moment, the power of the first transmission shaft (24) cannot be output to the first-gear driving gear and the second-gear driving gear, and the speed reducer is in a neutral state.

4. A two-speed power transmission reducer for a rake according to claim 3, characterized in that: the inner hole of the second-gear driven gear (62) is provided with inner spline teeth which are matched and connected with outer spline teeth of the outer diameter of the second transmission shaft (33), the inner hole of the first-gear driven gear (59) is provided with inner spline teeth which are matched and connected with outer spline teeth of the second transmission shaft (33), an adjusting sleeve (61) is arranged between the first-gear driven gear (59) and the second-gear driven gear (62), and the inner hole of the adjusting sleeve (61) is sleeved on the outer spline large diameter of the second transmission shaft (33).

5. The two-gear power transmission speed reducer for a power rake according to any one of claims 1 to 4, characterized in that: the first-gear driving gear (16), the second-gear driving gear (7), the first-gear driven gear (59) and the second-gear driven gear (62) are helical gears.

6. The two-gear power transmission speed reducer for the power rake according to claim 5, wherein: the speed reducer shell is provided with a shifting fork positioning shaft seat (3) and a shifting fork shaft seat (18) which are oppositely arranged, the shifting fork connecting rod (1) is arranged in the shaft seat holes of the shifting fork positioning shaft seat (3) and the shifting fork shaft seat (18), and the shifting fork connecting rod (1) can axially move along the axis of the shifting fork connecting rod;

Three circular arc grooves are formed in the outer diameter of the shifting fork connecting rod (1), the three circular arc grooves correspond to two-gear, neutral-gear and first-gear working positions from left to right, positioning steel balls (4) and positioning springs (5) are arranged in an inner hole in the vertical direction of the shifting fork positioning shaft seat (3), and the three circular arc grooves can automatically center the outer diameter of the shifting fork connecting rod (1) and correspond to three working positions; the other end of the gear shifting fork (12) is arranged in a groove of the combining sleeve (13), and the combining sleeve (13) is driven by the gear shifting fork (12) to axially move under the condition of being matched with the internal and external splines of the spline hub (11) so as to finish gear shifting action; a groove is formed in a horizontal inner hole of the shifting fork positioning shaft seat (3), and a first O-shaped ring (2) is arranged in the groove; the inner diameter of the first O-shaped ring (2) is matched and sealed with the outer diameter of the shifting fork connecting rod (1), a groove is formed in the outer shaft diameter of the shifting fork positioning shaft seat (3), a second O-shaped ring (6) is mounted to be matched and sealed with the mounting hole of the shifting fork positioning shaft seat (3), a groove is formed in the outer shaft diameter of the shifting fork shaft seat (18), and a fourth O-shaped ring (17) is mounted to be matched and sealed with the mounting hole of the shifting fork shaft seat (18).

7. The two-gear power transmission speed reducer for the power rake according to claim 6, wherein:

The speed reducer shell comprises a front box body (23), a rear box body (9) and a spiral bevel transmission box body (32); the front box body (23) and the rear box body (9) are provided with a first tapered roller bearing (25), a second tapered roller bearing (22) and a third tapered roller bearing (73), and the first transmission shaft (24) is provided with bearing inner rings of the first tapered roller bearing (25), the second tapered roller bearing (22) and the third tapered roller bearing (73);

The right side terminal surface of first tapered roller bearing (25) is provided with first adjustment packing ring (30), and first end cap (28) are installed on its right side, install first skeleton oil blanket (29) in first end cap (28) hole, first end cap (28) are fixed on preceding box (23) through first countersunk head screw (26), and the faying surface of first end cap (28) and preceding box (23) is provided with fifth O shape circle (27), the left side terminal surface of second tapered roller bearing (22) is provided with first hole and uses retaining ring (20), and first hole is used retaining ring (20) to install in the slot of the bearing chamber hole of preceding box (23), second adjustment packing ring (74) are installed to third tapered roller bearing (73) left side terminal surface, and second end cap (71) are installed in its left side, install second skeleton oil blanket (72) in second end cap (71) hole, second end cap (71) are fixed on back box (9) through second countersunk head screw (70), and second box (71) are provided with the faying surface of eleventh O shape (75).

8. The two-speed power transmission reducer for a power rake according to claim 7, wherein: the rear box body (9) is provided with a fourth tapered roller bearing (37), a fifth tapered roller bearing (55) and a sixth tapered roller bearing (67) respectively, and the second transmission shaft (33) is arranged in the inner rings of the fourth tapered roller bearing (37), the fifth tapered roller bearing (55) and the sixth tapered roller bearing (67); the right side terminal surface of fourth tapered roller bearing (37) is provided with third adjustment washer (40), and third end lid (39) are installed on its right side, third end lid (39) are fixed on spiral shell umbrella transmission box (32) through second hexagon socket head cap screw (41), and faying surface of third end lid (39) and spiral shell umbrella transmission box (32) is provided with sixth O shape circle (38), oil pointer (79) are installed to the right side terminal surface of third end lid (39), the left side terminal surface of fifth tapered roller bearing (55) is provided with fourth adjustment washer (68), and the left side of fourth adjustment washer (68) is provided with second hole for retainer ring (58), and second hole for retainer ring (58) are installed in the slot of the bearing chamber hole of spiral shell umbrella transmission box (32), fifth adjustment washer (65) are installed to the left side terminal surface of sixth tapered roller bearing (67), and fourth end lid (66) are installed on the left side of its, fourth end lid (66) are fixed on back box (9) through third countersunk head screw (63), and fourth end lid (64) are provided with ten shape and are combined.

9. The two-speed power transmission reducer for a power rake according to claim 8, wherein: a fifth sealing cover (50) and a fourth hole retainer ring (49) are arranged in an inner hole at the lower part of the base (46), a groove is formed in the outer diameter of the fifth sealing cover (50), an eighth O-shaped ring (48) is arranged, a third framework oil seal (51) is arranged in the inner hole of the fifth sealing cover (50), and the inner diameter of the third framework oil seal (51) is matched with the outer shaft diameter of the driven spiral bevel gear (36);

The base (46) is provided with a second screw plug (45), the upper part of the screw umbrella transmission box body (32) is provided with a first screw plug (31) and a first breather valve (78), the upper part of the front box body (23) is provided with a second breather valve (80), and the lower part of the rear box body (9) is provided with an inner hexagonal screw plug (60).

10. The two-speed power transmission reducer for a power rake according to claim 9, wherein: an inner hole of the driving spiral bevel gear (53) is provided with inner spline teeth which are connected with outer spline teeth of the second transmission shaft (33) in a matched mode, the outer shaft diameter of the driving spiral bevel gear (53) is arranged in an inner ring hole of the fifth tapered roller bearing (55), the left end face of the driving spiral bevel gear (53) is in contact with the right end face of the first-gear driven gear (59), and the right end face of the driving spiral bevel gear (53) is in contact with a shoulder of the second transmission shaft (33);

An inner spline tooth is arranged in an inner hole at the lower part of the driven spiral bevel gear (36) and used as the power output connecting part, an EG oil seal (35) and a third hole check ring (34) are arranged in the inner hole at the upper part of the driven spiral bevel gear (36), the third hole check ring (34) is arranged in a groove at the inner hole at the upper part of the driven spiral bevel gear (36), a groove is arranged on the outer shaft diameter at the lower part of the driven spiral bevel gear (36), and a shaft check ring (47) is arranged; a sixth adjusting washer (52) is provided between the shaft retainer ring (47) and the eighth tapered roller bearing (43).