Double-differential steering gearbox

Abstract

The utility model discloses a double-differential steering gearbox, and belongs to the technical field of gearboxes. The gearbox overcomes the defects that in the prior art, when a dangerous condition occurs during steering, power cannot be cut off in time, and unnecessary harm is likely to be caused to a human body. The main structure of the gearbox comprises a box body, an input shaft, a shifting fork shaft, a gear shifting mechanism and a steering transmission mechanism are arranged on the box body, a sliding gear is arranged on the input shaft, the shifting fork shaft is matched with the sliding gear through a shifting fork, the sliding gear is further in transmission connection with the steering transmission mechanism through the gear shifting mechanism, and a steering control shifting fork is installed on the steering transmission mechanism. The steering control shifting fork is connected with the steering handle through a connecting plate and a steering shifting fork shaft, and the steering shifting fork shaft is installed on the box body in a penetrating mode. The utility model is mainly applied to agricultural machinery.

Description

Technical Field

[0001] The utility model belongs to the technical field of gearboxes, and in particular relates to a dual-differential steering gearbox. Background Art

[0002] During the operation of agricultural machinery, the existing gearbox is bulky and requires a lot of physical strength when turning. When the whole machine needs to turn frequently, it is easy to cause a large physical burden. In addition, when turning, when a dangerous situation occurs, the power cannot be cut off in time, which is easy to cause unnecessary harm to the person.

[0003] For example, the Chinese utility model patent with application number 202120937997.9 discloses a lawn mower gearbox, which has the following shortcomings: it has too few gears and cannot meet the existing agricultural machinery working conditions, and it has no differential structure, and cannot reach the state of flameout when turning, which makes it easy to make rapid turns when turning, which may endanger personal safety. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a dual-differential steering gearbox.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] A dual differential steering gearbox comprises a housing, on which an input shaft, a shift fork shaft, a shift mechanism and a steering transmission mechanism are arranged; a sliding gear is arranged on the input shaft, the shift fork shaft cooperates with the sliding gear through a shift fork, the sliding gear is also connected to the steering transmission mechanism through the shift mechanism, a steering control fork is installed on the steering transmission mechanism, the steering control fork is connected to the steering handle through a connecting plate and a steering fork shaft, and the steering fork shaft is installed through the housing.

[0007] Preferably, the shift mechanism comprises a reverse shaft, a pinion shaft and a fourth shaft, the reverse shaft is provided with a reversing gear, the pinion shaft is provided with a first gear passive gear, a second gear passive gear and a third gear passive gear, and the fourth shaft is provided with a terminal gear, a driving gear and a double gear sleeve.

[0008] Preferably, the steering transmission mechanism includes a left traveling shaft, a right traveling shaft, a hollow sleeve and an output passive gear, the output passive gear is connected to the hollow sleeve through a spline, steel balls are installed in the holes of the outer circumference on both sides of the hollow sleeve, sliding outer sleeves are installed outside the assembly holes of the steel balls, and a reset spring is installed between the two sliding outer sleeves.

[0009] Preferably, the cylindrical hole of the sliding outer sleeve has the same outer diameter as that of the hollow sleeve, and the sliding outer sleeve can slide on the hollow sleeve.

[0010] Preferably, the steering control fork is an arc-shaped structure, and the steering control fork is installed in cooperation with the sliding outer stop sleeve. A torsion spring is provided on the steering fork shaft, and the torsion spring is installed between the outer side wall of the box body and the steering handle.

[0011] Preferably, the driving gear is meshingly transmission-connected with the output driven gear.

[0012] Preferably, an input pulley for power input is provided at one end of the input shaft extending out of the housing.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The steering control fork is an arc-shaped structure. The steering control fork is installed in conjunction with the sliding outer stopper. The steering control fork is connected to the steering handle through a connecting plate and a steering fork shaft. The steering fork shaft is installed through the box body and reset by a reset spring. The glands on both sides only serve to fix the bearings and assemble the oil seals. Therefore, the manufacturing process of the glands is simple, the risk of oil leakage is small, and the reliability is high.

[0015] 2. The utility model can realize three forward gears and one reverse gear. Steel balls are installed in the holes of the outer circumferences on both sides of the hollow sleeve. The steel balls are in contact with the grooves on the left and right travel shafts to transmit power to drive the left and right travel shafts to rotate and realize walking. A sliding outer stop sleeve is installed outside the assembly hole of the steel ball. The sliding outer stop sleeve can slide on the hollow sleeve. When the cylindrical hole coincides with the position of the steel ball, the steel ball is pressed to the tooth groove of the left travel shaft, and the left travel shaft moves; when the cylindrical hole coincides with the position of the steel ball, the power of the right travel shaft is cut off and stops moving. At this time, the state is turning to the right; when the sliding outer stop sleeve coincides with the positions of the left and right steel balls, the machine moves in a straight line, otherwise it stops, realizing easy steering of the whole machine, with good reliability and low failure rate;

[0016] 3. The utility model realizes the reset when the steering handle is released by installing a reset spring between two sliding outer sleeves, which has high reliability and can prevent injuries to personnel in dangerous situations by cutting off the power in time;

[0017] 4. A torsion spring is provided on the steering fork shaft. The functions of the torsion spring are to increase the strength of the return spring and play an auxiliary role, and to reduce the manufacturing clearance of the steering fork shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the transmission structure of the utility model;

[0021] Figure 4 It is the reverse transmission route map in the utility model;

[0022] Figure 5 It is the forward transmission route map in the utility model.

[0023] In the figure: 1. box body; 2. reversing gear; 3. reverse gear shaft; 4. input pulley; 5. input shaft; 6. second gear driven gear; 7. pinion shaft; 8. third gear driven gear; 9. end gear; 10. driving gear; 11. output driven gear; 15. sliding outer sleeve; 16. left travel shaft; 17. connecting plate; 18. fork shaft; 19. fork; 20. sliding gear; 21. first gear driven gear; 22. double gear sleeve; 23. fourth shaft; 26. hollow sleeve; 27. steel ball; 28. right travel shaft; 29. ​​reset spring; 30. steering control fork; 31. steering fork shaft; 32. steering handle; 33. torsion spring; 34. pressure cover. DETAILED DESCRIPTION

[0024] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0025] Embodiment 1:

[0026] like Figure 1-5 As shown, a dual differential steering gearbox includes a housing 1, on which an input shaft 5, a fork shaft 18, a shift mechanism and a steering transmission mechanism are arranged, a sliding gear 20 is arranged on the input shaft 5, and an input pulley 4 for power input is arranged at one end of the input shaft 5 extending out of the housing 1, the fork shaft 18 cooperates with the sliding gear 20 through a fork 19, and the sliding gear 20 is also connected to the steering transmission mechanism through the shift mechanism, and a steering control fork 30 is installed on the steering transmission mechanism, and the steering control fork 30 is connected to the steering handle 32 through a connecting plate 17 and a steering fork shaft 31, and the steering fork shaft 31 is installed through the housing 1. The pressure cover 34 in the utility model only plays the role of fixing the bearing and assembling the oil seal.

[0027] Embodiment 2:

[0028] A dual differential steering gearbox, which is different from Example 1 in that the shifting mechanism includes a reverse gear shaft 3, a pinion shaft 7 and a fourth shaft 23, the reverse gear shaft 3 is provided with a reversing gear 2, the pinion shaft 7 is provided with a first gear driven gear 21, a second gear driven gear 6 and a third gear driven gear 8, and the fourth shaft 23 is provided with a terminal gear 9, a driving gear 10 and a double gear sleeve 22.

[0029] Furthermore, the steering transmission mechanism includes a left travel shaft 16, a right travel shaft 28, a hollow sleeve 26 and an output passive gear 11, the driving gear 10 is meshed and transmission-connected with the output passive gear 11, the output passive gear 11 is connected to the hollow sleeve 26 through a spline, steel balls 27 are installed in the holes of the outer circumference on both sides of the hollow sleeve 26, and a sliding outer sleeve 15 is installed outside the assembly hole of the steel ball 27, and a reset spring 29 is installed between the two sliding outer sleeves 15; the cylindrical hole of the sliding outer sleeve 15 is the same as the outer diameter of the hollow sleeve 26, and the sliding outer sleeve 15 can slide on the hollow sleeve 26.

[0030] Furthermore, the steering control fork 30 is an arc-shaped structure, and the steering control fork 30 is installed in cooperation with the sliding outer stopper 15, and a torsion spring 33 is provided on the steering fork shaft 31, and the torsion spring 33 is installed between the outer wall of the box body 1 and the steering handle 32. The functions of the torsion spring 33 are: first, to increase the strength of the return spring 29, playing an auxiliary role; second, to reduce the manufacturing gap of the steering fork shaft 31.

[0031] The working principle of the utility model is:

[0032] The input power enters the housing 1 through the input pulley 4 and the input shaft 5, and the sliding gear 20 slides on the input shaft 5 and meshes with the first gear driven gear 21, the second gear driven gear 6, and the third gear driven gear 8 to realize three forward gears. Figure 4 As shown; the sliding gear 20 meshes with the reversing gear 2, the reversing gear 2 meshes with the third gear driven gear 8, to achieve reverse gear, such as Figure 5 As shown. After the gear is selected, the gear on the pinion shaft 7 is rotated to mesh with the terminal gear 9, and then meshes with the output driven gear 11 through the driving gear 10. The output driven gear 11 is splined with the hollow sleeve 26. There are holes on the outer circumference of both sides of the hollow sleeve 26. Steel balls 27 are installed in the holes. The steel balls 27 are in contact with the grooves on the right travel shaft 28 and the left travel shaft 16 to transmit power to drive the left and right travel shafts to rotate. Tires are installed on the travel shafts to achieve walking. The cylindrical hole of the sliding outer stopper sleeve 15 has the same outer diameter as the hollow sleeve 26, and there is a tapered hole on one side of the cylindrical hole. The sliding outer stopper sleeve 15 is driven by the steering handle 32 to push the steering fork shaft 31, the connecting plate 17, and the steering control fork 30 to slide on the hollow sleeve 26. When the cylindrical hole coincides with the position of the steel ball 27 (such as Figure 5 When the conical hole overlaps with the position of the steel ball 27, the steel ball 27 is pushed out by the tooth groove of the left travel shaft, and the power of the left travel shaft 16 is cut off and the movement is stopped. At this time, the state is forward and turns left. After the turning is completed, the steering handle 32 is released, and the return spring 29 inside the hollow sleeve 26 pushes the hollow sleeve 26 to move outward and press into the steel ball 27, and the straight-line movement is restored. When the positions of the hollow sleeves 26 on both sides and the left and right steel balls 27 are overlapped, the movement is straight, otherwise it stops.

Claims

1. A dual differential steering gearbox, comprising a housing (1), characterized in that: The housing (1) is provided with an input shaft (5), a shift fork shaft (18), a shift mechanism and a steering transmission mechanism; the input shaft (5) is provided with a sliding gear (20); the shift fork shaft (18) cooperates with the sliding gear (20) via a shift fork (19); the sliding gear (20) is also connected to the steering transmission mechanism via the shift mechanism; a steering control fork (30) is installed on the steering transmission mechanism; the steering control fork (30) is connected to a steering handle (32) via a connecting plate (17) and a steering fork shaft (31); and the steering fork shaft (31) is installed through the housing (1).

2. The dual differential steering gearbox according to claim 1, characterized in that: The shift mechanism comprises a reverse gear shaft (3), a pinion shaft (7) and a fourth shaft (23); the reverse gear shaft (3) is provided with a reversing gear (2); the pinion shaft (7) is provided with a first gear driven gear (21), a second gear driven gear (6) and a third gear driven gear (8); and the fourth shaft (23) is provided with a terminal gear (9), a driving gear (10) and a double gear sleeve (22).

3. The dual differential steering gearbox according to claim 2, characterized in that: The steering transmission mechanism comprises a left travel shaft (16), a right travel shaft (28), a hollow sleeve (26) and an output driven gear (11); the output driven gear (11) is connected to the hollow sleeve (26) via a spline; steel balls (27) are installed in holes on both sides of the outer circumference of the hollow sleeve (26); sliding outer sleeves (15) are installed outside the assembly holes of the steel balls (27); and a return spring (29) is installed between the two sliding outer sleeves (15).

4. The dual differential steering gearbox according to claim 3, characterized in that: The cylindrical hole of the sliding outer sleeve (15) has the same outer diameter as the hollow sleeve (26), and the sliding outer sleeve (15) can slide on the hollow sleeve (26).

5. The dual differential steering gearbox according to claim 3, characterized in that: The steering control fork (30) is an arc-shaped structure, and the steering control fork (30) is installed in cooperation with the sliding outer stopper (15). A torsion spring (33) is arranged on the steering fork shaft (31), and the torsion spring (33) is installed between the outer side wall of the box body (1) and the steering handle (32).

6. The dual differential steering gearbox according to any one of claims 3 to 5, characterized in that: The driving gear (10) is meshingly connected with the output driven gear (11).

7. The dual differential steering gearbox according to any one of claims 1 to 5, characterized in that: An input pulley (4) for power input is provided at one end of the input shaft (5) extending outward from the housing (1).

Images