A through-shaft speed-changing rotary tiller gear box

Abstract

The invention relates to the technical field of rotary tiller gear boxes, and discloses a through-axis speed-changing rotary tiller gear box, comprising a box body provided with an output shaft and an input shaft, wherein both ends of the output shaft pass through the box body, a No. 1 gear is located in the box body in the middle and is fixed thereto, one end of the input shaft passes through the box body, and the other end is rotatably connected in the box body, a transmission shaft is also provided in the box body, a No. 2 gear meshing with the No. 1 gear is fixed to one end of the transmission shaft, and the other end is rotatably connected in the box body, a No. 3 gear and a No. 4 gear are fixed to the middle part of the transmission shaft, and a gap is provided between the No. 3 gear and the No. 4 gear; a sleeve is slidably connected to the input shaft, the sleeve is composed of two No. 5 gear and No. 6 gear fixed together, a wheel groove is provided between the No. 5 gear and the No. 6 gear, and a speed adjustment mechanism is also provided in the box body; the through-axis speed-changing rotary tiller gear box has the advantages of shifting gears and reducing jitter.

Description

Technical Field

[0001] The invention relates to the technical field of rotary tiller gear boxes, in particular to a through-shaft speed-changing rotary tiller gear box. Background Art

[0002] The through-axis rotary tiller gearbox is an agricultural gearbox, which is mainly used for transmitting and controlling the operation of agricultural machinery and equipment. It is the power source of rotary tillers and other agricultural machinery and equipment. Its characteristics are that both ends of the output shaft extend to the outside of the gearbox, and the input shaft is perpendicular to the output shaft. The input shaft in the existing through-axis rotary tiller gearbox is connected to the output shaft through a bevel gear, thereby driving the output shaft to rotate, and both ends of the output shaft are located outside the gearbox, which can drive the transmission mechanisms on both sides to rotate at the same time.

[0003] The existing through-axis rotary tiller gearbox does not have a speed change function. Since the looseness and humidity of the soil in which the rotary tiller works may vary during agricultural cultivation, the speed change function helps the rotary tiller adapt to different working environments. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a through-shaft variable-speed rotary tiller gearbox, which has the advantages of gear shifting and speed change, and solves the problem that the through-shaft rotary tiller gearbox in the above-mentioned background technology lacks a speed change function.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A through-axis variable speed rotary tiller gearbox, comprising a box body, an output shaft and an input shaft passing through the box body, both ends of the output shaft passing through the box body, the middle of the output shaft being located in the box body and fixed with a No. 1 gear, one end of the input shaft passing through the box body, the other end being rotatably connected in the box body, a transmission shaft is also arranged in the box body, one end of the transmission shaft is fixed with a No. 2 gear meshing with the No. 1 gear, and the other end is rotatably connected in the box body, a No. 3 gear and a No. 4 gear are fixed to the middle part of the transmission shaft, and a gap is arranged between the No. 3 gear and the No. 4 gear;

[0009] The input shaft is slidably connected with a sleeve, which is composed of two fixed gears, a fifth gear and a sixth gear. The spur teeth on the fifth gear and the sixth gear match the third gear and the fourth gear respectively. A wheel groove is provided between the fifth gear and the sixth gear. A speed adjustment mechanism is also provided in the box body, and the speed adjustment mechanism includes:

[0010] The shift fork is clamped in the wheel groove, and a lifting sleeve is provided at the part outside the wheel groove. The lifting sleeve is sleeved on the adjustment shaft and slides. The shift fork is also provided with a shift fork sliding groove;

[0011] Adjusting shaft, both ends of which are fixed in the box;

[0012] A shift rod, one end of which is slidably connected in the shift fork slide slot, and the other end of which is vertically fixed to one end of the connecting shaft;

[0013] The connecting shaft passes through the inside and outside of the box body, and a lever is fixed on one end located inside the box body, and a wrench is fixed on the other end located outside the box body.

[0014] Preferably, the part of the shift fork used for clamping the wheel groove is provided with a shift fork clamping block, and the shift fork clamping block comprises:

[0015] A clamping block body, wherein the upper and lower sides of the clamping block body are slidably connected with sliding blocks;

[0016] The sliding blocks are located on the upper and lower sides of the clamping block body, and the outer sides of the two sliding blocks are respectively attached to the upper and lower surfaces of the wheel groove;

[0017] A sliding column, wherein the upper and lower sliding blocks are connected together by the sliding column, and the clamping block body is provided with a central groove at a position corresponding to the sliding column, and the sliding column slides in the central groove;

[0018] A pressure sensor is provided, wherein a push rod is fixedly connected to one side of the sliding column, the other end of the push rod is pressed against a pressure spring, and a pressure sensor is provided at the other end of the pressure spring, and the magnitude of the friction force on the sliding block is detected by the pressure sensor.

[0019] Preferably, the clamp block body is provided with inclined surfaces on the upper and lower surfaces of one end in the direction opposite to the positive rotation direction of the input shaft, the inclined surface is inclined inwardly on the side in the direction opposite to the positive rotation direction of the input shaft, and the inclined surface is inclined outwardly on the side in the direction of the positive rotation direction of the input shaft, and the two sliding blocks slide on the upper and lower inclined surfaces, and the sliding blocks are always attached to the upper and lower surfaces of the wheel groove after sliding through friction, so as to avoid jitter caused by the gap between the fork clamp block and the wheel groove;

[0020] The upper and lower ends of the sliding column are slidably connected in two sliding blocks, and a limiting structure is arranged in the sliding block to prevent the sliding column from sliding out of the sliding groove in the sliding block.

[0021] Preferably, the housing is divided into a front housing and a rear housing, the front housing and the rear housing are sealed, the output shaft passes through the front housing, the number one gear and the number two gear are meshed in the front housing, the number three gear and the number four gear are arranged in the rear housing, the number five gear and the number six gear are also arranged in the rear housing, and the transmission shaft and the input shaft pass through the partition between the front housing and the rear housing.

[0022] Preferably, the wrench is provided with a detachable fixing pin, and the outer side of the box body is provided with two fixing holes, and the two fixing holes respectively correspond to the positions of the fixing pin when the wrench is rotated to two angles;

[0023] When the wrench is at two angles, the shift fork is driven to slide up and down respectively. When the shift fork slides up, the fifth gear is meshed with the third gear, and the sixth gear is located in the gap between the third gear and the fourth gear. When the shift fork slides down, the sixth gear is meshed with the fourth gear, and the fifth gear is located in the gap between the third gear and the fourth gear.

[0024] The gear pitch circle diameter of the fifth gear is smaller than the gear pitch circle diameter of the sixth gear, and the gear pitch circle diameter of the third gear is larger than the gear pitch circle diameter of the fourth gear.

[0025] Preferably, a side hole is provided on the side of the lifting sleeve, a limiting bead is provided in the side hole, one side of the limiting bead presses against the side of the adjusting shaft, and a limiting spring is provided on the other side, a side hole cover is provided on the outer side of the side hole, and the other end of the limiting spring presses against the side hole cover;

[0026] The adjusting shaft is provided with two adjusting grooves, and when the shift fork slides to the upper and lower sides, the limiting beads are respectively stuck in the two adjusting grooves.

[0027] Preferably, the part of the input shaft inside the rear housing is provided with a plurality of vertical cams distributed circumferentially, and the inner wall of the sleeve composed of the fifth gear and the sixth gear is provided with grooves matching with the cams, so that the fifth gear and the sixth gear can be driven to rotate synchronously when the input shaft rotates, and the sleeve composed of the fifth gear and the sixth gear can slide on the input shaft.

[0028] Preferably, the transmission shaft is provided with a plurality of vertical cams distributed circumferentially in the portion inside the rear housing, and grooves cooperating with the cams are respectively provided on the inner walls of the fifth gear and the sixth gear, so as to drive the transmission shaft to rotate when the third gear or the fourth gear rotates, and facilitate the sliding installation of the third gear and the fourth gear onto the transmission shaft during installation, and limit blocks for limiting sliding are provided on the upper and lower sides of the third gear and the fourth gear.

[0029] Preferably, the fixing pin is installed on the wrench in a latching manner, or is installed on the wrench by a threaded connection.

[0030] (III) Beneficial effects

[0031] Compared with the prior art, the present invention provides a through-shaft variable speed rotary tiller gearbox, which has the following beneficial effects:

[0032] 1. The through-axis speed-changing rotary tiller gearbox is provided with a transmission shaft in the box body of the through-axis gearbox to connect the output shaft and the input shaft. The connecting shaft and the shift lever are rotated by turning the wrench. During the rotation of the shift lever, the end portion slides in the shift fork slide groove, thereby driving the shift fork to slide up and down. The shift fork is clamped in the wheel groove, thereby driving the fifth gear and the sixth gear to move. When the shift fork moves upward, the fifth gear is meshed with the third gear, and the gear transmission ratio is large at this time. When the shift fork moves downward, the sixth gear is meshed with the fourth gear, and the gear transmission ratio is small, thereby realizing the speed change function of the through-axis gearbox.

[0033] 2. The through-axis variable speed rotary tiller gearbox has a sliding block that can slide above and below the fork clamp block, and the sliding block is connected to a pressure sensor. The amount of lubricating oil in the wheel groove can be analyzed by detecting the friction force exerted on the sliding block, thereby deriving the total amount and quality of the lubricating oil.

[0034] 3. The through-axis speed-changing rotary tiller gearbox sets the center groove as an inclined surface, and utilizes friction to drive the sliding block to move in the direction of fitting the wheel groove during the sliding process, so that the fork clamp block fits tightly with the wheel groove when the gearbox rotates forward, thereby reducing shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention.

[0036] Figure 2 It is a cross-sectional view of the transmission part of the output shaft and the transmission shaft of the present invention.

[0037] Figure 3 It is a cross-sectional view of the transmission part of the input shaft and the transmission shaft of the present invention.

[0038] Figure 4 It is a cross-sectional view of the speed adjustment mechanism of the present invention.

[0039] Figure 5 It is a schematic structural diagram of the adjusting shaft of the present invention.

[0040] Figure 6 It is a schematic structural diagram of the transmission part of the input shaft and the transmission shaft of the present invention.

[0041] Figure 7 It is a structural schematic diagram of the wrench of the present invention.

[0042] Figure 8 It is a structural schematic diagram of the shift fork of the present invention.

[0043] Fig. 9 It is a schematic structural diagram of the first shift fork clamp block of the present invention.

[0044] Fig.10 It is a cross-sectional view of the first shift fork clamp block of the present invention.

[0045] Fig.11 It is a structural schematic diagram of the clamping block body of the present invention.

[0046] Fig.12 It is a structural schematic diagram of the sliding block of the present invention.

[0047] Fig.13 It is a schematic structural diagram of the second shift fork clamp block of the present invention.

[0048] Fig.14 It is a cross-sectional view of the second shift fork clamp block of the present invention.

[0049] In the figure: 11, output shaft; 12, input shaft; 13, transmission shaft;

[0050] 21. front box; 22. rear box;

[0051] 31, gear 1; 32, gear 2; 33, gear 3; 34, gear 4; 35, gear 5; 36, gear 6; 67, gear slot;

[0052] 41. shift fork; 42. adjustment shaft; 411. lifting sleeve; 412. side hole; 4121. limit bead; 4122. limit spring; 4123. side hole cover; 413. shift fork slide; 43. shift rod; 44. connecting shaft; 45. spanner; 421. adjustment slot; 451. fixing pin; 452. fixing hole;

[0053] 5. Fork clamping block; 51. Clamping block body; 52. Sliding block; 53. Sliding column; 54. Push rod; 55. Pressure spring; 56. Pressure sensor; 511. Inclined surface; 512. Center groove. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] Embodiment 1:

[0058] This embodiment provides a through-axis variable speed rotary tiller gearbox having the following technical features.

[0059] See also Figure 1-14 A through-axis variable speed rotary tiller gearbox, comprising a box body, an output shaft 11 and an input shaft 12 passing through the box body, the output shaft 11 passes through the box body at both ends, is located in the box body in the middle and is fixed with a No. 1 gear 31, one end of the input shaft 12 passes through the box body, and the other end is rotatably connected in the box body, a transmission shaft 13 is also arranged in the box body, one end of the transmission shaft 13 is fixed with a No. 2 gear 32 meshing with the No. 1 gear 31, and the other end is rotatably connected in the box body, a No. 3 gear 33 and a No. 4 gear 34 are fixed in the middle part of the transmission shaft 13, and a gap is arranged between the No. 3 gear 33 and the No. 4 gear 34;

[0060] The input shaft 12 is slidably connected with a sleeve, which is composed of two fixed gears, a fifth gear 35 and a sixth gear 36. The spur teeth on the fifth gear 35 and the sixth gear 36 match the third gear 33 and the fourth gear 34 respectively. A wheel groove 67 is provided between the fifth gear 35 and the sixth gear 36. A speed adjustment mechanism is also provided in the box body, and the speed adjustment mechanism includes:

[0061] The shift fork 41 is clamped in the wheel groove 67. A lifting sleeve 411 is provided at the portion outside the wheel groove 67. The lifting sleeve 411 is sleeved on the adjustment shaft 42 and slides. The shift fork 41 is also provided with a shift fork sliding groove 413.

[0062] The adjusting shaft 42 has two ends fixed in the box;

[0063] The shift rod 43 has one end slidably connected in the shift fork sliding groove 413 and the other end vertically fixedly connected to one end of the connecting shaft 44;

[0064] The connecting shaft 44 passes through the inside and outside of the box, and a lever 43 is fixed to one end located inside the box, and a wrench 45 is fixed to the other end located outside the box.

[0065] By setting a transmission shaft 13 in the housing of the through-axis gearbox to connect the output shaft 11 and the input shaft 12, rotating the wrench 45 drives the connecting shaft 44 and the shift rod 43 to rotate. During the rotation of the shift rod 43, the end portion slides in the shift fork slide groove 413, thereby driving the shift fork 41 to slide up and down. The shift fork 41 is clamped in the wheel groove 67, thereby driving the fifth gear 35 and the sixth gear 36 to move. When the shift fork 41 moves upward, the fifth gear 35 is meshed with the third gear 33, and the gear transmission ratio is large at this time. When the shift fork 41 moves downward, the sixth gear 36 is meshed with the fourth gear 34, and this gear transmission ratio is small, thereby realizing the speed change function of the through-axis gearbox.

[0066] In an optional embodiment, the housing is divided into a front housing 21 and a rear housing 22, the front housing 21 and the rear housing 22 are sealed, the output shaft 11 passes through the front housing 21, the first gear 31 and the second gear 32 are meshed in the front housing 21, the third gear 33 and the fourth gear 34 are arranged in the rear housing 22, the fifth gear 35 and the sixth gear 36 are also arranged in the rear housing 22, and the transmission shaft 13 and the input shaft 12 pass through the partition between the front housing 21 and the rear housing 22.

[0067] In an optional embodiment, a detachable fixing pin 451 is provided on the wrench 45, and two fixing holes 452 are provided on the outer side of the box body, and the two fixing holes 452 respectively correspond to the positions of the fixing pin 451 when the wrench 45 is rotated to two angles;

[0068] When the wrench 45 is at two angles, the shift fork 41 is driven to slide up and down respectively. When the shift fork 41 slides upward, the fifth gear 35 is meshed with the third gear 33. At this time, the sixth gear 36 is located in the gap between the third gear 33 and the fourth gear 34. When the shift fork 41 slides downward, the sixth gear 36 is meshed with the fourth gear 34. At this time, the fifth gear 35 is located in the gap between the third gear 33 and the fourth gear 34.

[0069] The gear pitch circle diameter of the fifth gear 35 is smaller than the gear pitch circle diameter of the sixth gear 36 , and the gear pitch circle diameter of the third gear 33 is larger than the gear pitch circle diameter of the fourth gear 34 .

[0070] In an optional embodiment, a side hole 412 is provided on the side of the lifting sleeve 411, a limiting bead 4121 is provided in the side hole 412, one side of the limiting bead 4121 presses against the side of the adjusting shaft 42, and a limiting spring 4122 is provided on the other side, a side hole cover 4123 is provided on the outer side of the side hole 412, and the other end of the limiting spring 4122 presses against the side hole cover 4123;

[0071] The adjusting shaft 42 is provided with two adjusting grooves 421 . When the shift fork 41 slides to the upper and lower sides, the limiting beads 4121 are respectively stuck in the two adjusting grooves 421 .

[0072] In an optional embodiment, the portion of the input shaft 12 inside the rear housing 22 is provided with a plurality of circumferentially distributed vertical cams, and the inner wall of the sleeve composed of the fifth gear 35 and the sixth gear 36 is provided with grooves that cooperate with the cams, so that when the input shaft 12 rotates, the fifth gear 35 and the sixth gear 36 are driven to rotate synchronously, and the sleeve composed of the fifth gear 35 and the sixth gear 36 is allowed to slide on the input shaft 12.

[0073] In an optional embodiment, the transmission shaft 13 is provided with a plurality of vertical convex keys distributed circumferentially in the portion inside the rear housing 22, and grooves cooperating with the convex keys are respectively provided on the inner walls of the fifth gear 35 and the sixth gear 36, so as to drive the transmission shaft 13 to rotate when the third gear 33 or the fourth gear 34 rotates, and facilitate the sliding installation of the third gear 33 and the fourth gear 34 onto the transmission shaft 13 during installation, and limit blocks for limiting sliding are provided on the upper and lower sides of the third gear 33 and the fourth gear 34.

[0074] In an optional embodiment, the fixing pin 451 is installed on the wrench 45 in a latching manner, or is installed on the wrench 45 by a threaded connection.

[0075] In an optional embodiment, sealing rings are provided at the parts where both ends of the output shaft 11 pass through the front housing 21 , at one end of the input shaft 12 pass through the front housing 21 , and at the part where the transmission shaft 13 passes through the partition between the front housing 21 and the rear housing 22 .

[0076] In an optional embodiment, the front box body 21 and the rear box body 22 are respectively provided with box covers, wherein the output shaft 11 and the input shaft 12 pass through the other parts of the front box body 21 except the box covers, and the rotating connection structure at the ends of the transmission shaft 13 and the input shaft 12 is arranged on the end cover of the rear box body 22 for easy disassembly.

[0077] In an optional embodiment, the fifth gear 35 and the third gear 33 are mutually meshing spur gears, the sixth gear 36 and the fourth gear 34 are mutually meshing spur gears, and the first gear 31 and the second gear 32 are mutually meshing bevel gears.

[0078] Embodiment 2:

[0079] This embodiment provides a through-axis variable-speed rotary tiller gearbox, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0080] Since the lubricating oil in the gear box is usually not filled up, and during the design, the height of the input shaft 12 is usually located at an upper position in the box, resulting in the amount of lubricating oil in the fifth gear 35 and the sixth gear 36 being lower than that in other parts, and the amount of lubricating oil in the wheel groove 67 between the fifth gear 35 and the sixth gear 36 being even less than that in other parts. After the oil leaks, manual observation is required to detect the oil leak, and failure to detect it in time will lead to further damage to the equipment.

[0081] In an optional embodiment, the portion of the shift fork 41 used for clamping the wheel groove 67 is provided with a shift fork clamping block 5, and the shift fork clamping block 5 includes:

[0082] A clamping block body 51, wherein the upper and lower sides of the clamping block body 51 are slidably connected to sliding blocks 52;

[0083] The sliding blocks 52 are located at the upper and lower sides of the clamping block body 51, and the outer sides of the two sliding blocks 52 are respectively attached to the upper and lower surfaces of the wheel groove 67;

[0084] The sliding post 53 is used to connect the upper and lower sliding blocks 52. The clamping block body 51 is provided with a central groove 512 at a position corresponding to the sliding post 53. The sliding post 53 slides in the central groove 512.

[0085] Pressure sensor 56: A push rod 54 is fixedly connected to one side of the sliding column 53, and the other end of the push rod 54 is pressed against a pressure spring 55. A pressure sensor 56 is provided at the other end of the pressure spring 55. The pressure sensor 56 detects the magnitude of the friction force on the sliding block 52.

[0086] By arranging a slidable sliding block 52 above and below the fork clamp 5 and connecting the sliding block 52 to a pressure sensor, the amount of lubricating oil in the wheel groove 67 can be analyzed by detecting the friction force exerted on the sliding block 52, thereby deriving the overall total amount and quality of the lubricating oil.

[0087] In an optional embodiment, the clamp block body 51 is provided with inclined surfaces 511 on the upper and lower surfaces of one end in the direction opposite to the positive rotation direction of the input shaft 12. The inclined surface 511 is inclined inwardly on the side in the direction opposite to the positive rotation direction of the input shaft 12, and is inclined outwardly on the side in the direction of the positive rotation direction of the input shaft 12. The two sliding blocks 52 slide on the upper and lower inclined surfaces 511, and the sliding blocks 52 are always attached to the upper and lower surfaces of the wheel groove 67 through friction after sliding, so as to avoid jitter caused by the gap between the fork clamp block 5 and the wheel groove 67.

[0088] The upper and lower ends of the sliding column 53 are slidably connected in the two sliding blocks 52 , and a limiting structure is provided in the sliding block 52 to prevent the sliding column 53 from sliding out of the sliding groove in the sliding block 52 .

[0089] By setting the central groove 512 as an inclined surface, the friction force is used to drive the sliding block 52 to move in the direction of fitting the wheel groove 67 during the sliding process, so that the fork clamp block 5 and the wheel groove 67 are closely fitted when the gear box rotates forward, reducing vibration.

[0090] In an optional embodiment, if Fig. 9 and Fig.13 As shown, it is a schematic diagram of the structure of two shift fork clamps 5 on the left and right sides of the same shift fork 41. The directions of the central grooves 512 on the two shift fork clamps 5 are opposite, so that the sliding blocks 52 on the two shift fork clamps 5 can slide along the direction of the friction force during forward rotation, and fit the upper and lower sides of the wheel groove 67. Due to the complex structure inside the shift fork clamp 5, the shift fork clamp 5 is set as a separate component, which is fixedly connected to the shift fork 41 by bolts.

[0091] Working principle: When working, the input shaft 12 rotates to drive the fifth gear 35 and the sixth gear 36 on the input shaft 12 to rotate, the fifth gear 35 meshes with the third gear 33 or the sixth gear 36 meshes with the fourth gear 34, but cannot mesh at the same time, thereby driving the transmission shaft 13 to rotate, the second gear 32 is fixed at the end of the transmission shaft 13, and the second gear 32 and the first gear 31 mesh with each other. Since the first gear 31 is fixed to the output shaft 11 through a keyway, the first gear 31 drives the output shaft 11 to rotate, and both ends of the output shaft 11 pass through the box body, respectively driving the transmission mechanisms on both sides to rotate;

[0092] When shifting gears, stop rotating the input shaft 12. After all parts stop rotating, pull out the fixing pin 451 on the wrench 45, rotate the wrench 45, drive the connecting shaft 44 to rotate, thereby drive the shift rod 43 to rotate, and during the rotation of the shift rod 43, drive the shift fork 41 to move up and down, thereby drive the fifth gear 35 and the sixth gear 36 to move up and down, the fifth gear 35, thereby switching the meshing of the fifth gear 35 with the third gear 33 to the meshing of the sixth gear 36 with the fourth gear 34, or switching the meshing of the sixth gear 36 with the fourth gear 34 to the meshing of the fifth gear 35 with the third gear 33. Since the transmission ratios of the two pairs of gears are different, gear shifting is achieved. After completing the gear shifting, reinsert the fixing pin 451 into the other fixing hole 452 to complete the locking.

[0093] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A through-axis variable speed rotary tiller gearbox, comprising a box body, an output shaft (11) and an input shaft (12) passing through the box body, the output shaft (11) having two ends passing through the box body and a first gear (31) being located in the middle of the box body, and one end of the input shaft (12) passing through the box body and the other end being rotatably connected to the box body, characterized in that: A transmission shaft (13) is also provided in the housing, a second gear (32) meshing with the first gear (31) is fixed at one end of the transmission shaft (13), and the other end is rotatably connected in the housing, a third gear (33) and a fourth gear (34) are fixed at the middle portion of the transmission shaft (13), and a gap is provided between the third gear (33) and the fourth gear (34); The input shaft (12) is slidably connected with a sleeve, the sleeve is composed of two fixed gears (35) and (36), the spur teeth on the gears (35) and (36) respectively match the gears (33) and (34), a wheel groove (67) is provided between the gears (35) and (36), and a speed adjustment mechanism is also provided in the housing, the speed adjustment mechanism comprising: A shift fork (41) is clamped in the wheel groove (67), and a lifting sleeve (411) is provided at a portion outside the wheel groove (67). The lifting sleeve (411) is sleeved on the adjustment shaft (42) to slide, and a shift fork sliding groove (413) is also provided on the shift fork (41); An adjusting shaft (42), both ends of which are fixed in the box; A shift rod (43), one end of which is slidably connected in the shift fork sliding groove (413), and the other end of which is vertically fixedly connected to one end of the connecting shaft (44); A connecting shaft (44) passes through the inside and outside of the box, with a lever (43) fixed to one end located inside the box and a wrench (45) fixed to the other end located outside the box; The portion of the shift fork (41) used for clamping the wheel groove (67) is provided with a shift fork clamping block (5), and the shift fork clamping block (5) comprises: A clamping block body (51), wherein the upper and lower sides of the clamping block body (51) are slidably connected to sliding blocks (52); Sliding blocks (52), the outer sides of the two sliding blocks (52) are respectively attached to the upper and lower surfaces of the wheel groove (67); A sliding post (53), wherein the upper and lower sliding blocks (52) are connected together via the sliding post (53), and the clamping block body (51) is provided with a central groove (512) at a position corresponding to the sliding post (53); A pressure sensor (56), wherein a push rod (54) is fixedly connected to one side of the sliding column (53), the other end of the push rod (54) is pressed against a pressure spring (55), and the other end of the pressure spring (55) is provided with a pressure sensor (56); The clamp block body (51) is provided with inclined surfaces (511) on the upper and lower surfaces of one end thereof in a direction opposite to the positive rotation direction of the input shaft (12); the inclined surface (511) is inclined inwardly on the side in a direction opposite to the positive rotation direction of the input shaft (12); and the inclined surface (511) is inclined outwardly on the side in a direction in which the input shaft (12) rotates in a positive direction; two sliding blocks (52) slide on the upper and lower inclined surfaces (511); and the sliding blocks (52) are always attached to the upper and lower surfaces of the wheel groove (67) after sliding due to frictional force, thereby avoiding vibration caused by a gap between the shift fork clamp block (5) and the wheel groove (67); The upper and lower ends of the sliding column (53) are slidably connected in the two sliding blocks (52), and a limiting structure is provided in the sliding block (52) to prevent the sliding column (53) from sliding out of the sliding groove in the sliding block (52).

2. The through-axis variable speed rotary tiller gearbox according to claim 1, characterized in that: The housing is divided into a front housing (21) and a rear housing (22), the front housing (21) and the rear housing (22) are sealed, the output shaft (11) passes through the front housing (21), the first gear (31) and the second gear (32) are meshed in the front housing (21), the third gear (33) and the fourth gear (34) are arranged in the rear housing (22), the fifth gear (35) and the sixth gear (36) are also arranged in the rear housing (22), and the transmission shaft (13) and the input shaft (12) pass through a partition between the front housing (21) and the rear housing (22).

3. The through-axis variable speed rotary tiller gearbox according to claim 1, characterized in that: The wrench (45) is provided with a detachable fixing pin (451), and the outer side of the box body is provided with two fixing holes (452), the two fixing holes (452) respectively corresponding to the positions of the fixing pin (451) when the wrench (45) is rotated to two angles; When the wrench (45) is at two angles, it drives the shift fork (41) to slide up and down respectively. When the shift fork (41) slides upward, the fifth gear (35) meshes with the third gear (33), and the sixth gear (36) is located in the gap between the third gear (33) and the fourth gear (34). When the shift fork (41) slides downward, the sixth gear (36) meshes with the fourth gear (34), and the fifth gear (35) is located in the gap between the third gear (33) and the fourth gear (34). The gear pitch circle diameter of the fifth gear (35) is smaller than the gear pitch circle diameter of the sixth gear (36), and the gear pitch circle diameter of the third gear (33) is larger than the gear pitch circle diameter of the fourth gear (34).

4. The through-axis variable speed rotary tiller gearbox according to claim 3, characterized in that: A side hole (412) is provided on the side of the lifting sleeve (411), a limiting bead (4121) is provided in the side hole (412), one side of the limiting bead (4121) presses against the side of the adjustment shaft (42), and a limiting spring (4122) is provided on the other side, a side hole cover (4123) is provided on the outside of the side hole (412), and the other end of the limiting spring (4122) presses against the side hole cover (4123); Two adjustment slots (421) are provided on the adjustment shaft (42), and when the shift fork (41) slides to the upper and lower sides, the limiting beads (4121) are respectively stuck in the two adjustment slots (421).

5. The through-axis variable speed rotary tiller gearbox according to claim 2, characterized in that: The portion of the input shaft (12) inside the rear housing (22) is provided with a plurality of vertical convex keys distributed circumferentially, and a groove cooperating with the convex keys is provided on the inner wall of a sleeve composed of a fifth gear (35) and a sixth gear (36), so that when the input shaft (12) rotates, the fifth gear (35) and the sixth gear (36) are driven to rotate synchronously, and the sleeve composed of the fifth gear (35) and the sixth gear (36) is slid on the input shaft (12).

6. The through-axis variable speed rotary tiller gearbox according to claim 2, characterized in that: The transmission shaft (13) is provided with a plurality of vertical convex keys distributed circumferentially on the portion inside the rear housing (22), and grooves cooperating with the convex keys are provided on the inner walls of the fifth gear (35) and the sixth gear (36), respectively, so as to drive the transmission shaft (13) to rotate when the third gear (33) or the fourth gear (34) rotates, and the third gear (33) and the fourth gear (34) are slidably installed on the transmission shaft (13) during installation, and limit blocks for limiting sliding are provided on the upper and lower sides of the third gear (33) and the fourth gear (34).

7. The through-axis variable speed rotary tiller gearbox according to claim 3, characterized in that: The fixing pin (451) is installed on the wrench (45) in a latching manner, or is installed on the wrench (45) in a threaded connection manner.

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