A safety interlocking device for micro-tillage machine

Abstract

The invention discloses a safety interlocking device for a micro-tillage machine, characterized in that the reverse gear driving gear and the reverse gear driven gear are double gears, which rotate in the radial direction of the reverse gear shaft and are axially fixed, the reverse gear driving gear and the I-axis I-gear / reverse gear driven gear are a pair of constant meshing gears, the I-axis is a spline shaft, the II-gear and III-gear first driving gear and the II-gear and III-gear second driving gear are double gears, which slide axially on the I-axis spline and are respectively engaged in the I-gear, II-gear and / or III-gear, the I-axis I-gear / reverse gear driving gear and the I-axis rotary tillage driving gear are I-gear / reverse gear / rotary tillage double gears, which slide axially on the I-axis spline to realize the I-gear, reverse gear and rotary tillage, the II-gear and III-gear first driven gears and the II-gear and III-gear second driven gears are installed on the II-axis and rotate on the II-axis, and the II-axis rotary tillage driving gear and the II-axis rotary tillage driven gear are double gears. The invention has novel design, compact structure, safety and reliability, simple operation, convenient installation, easy manufacturing, and meets the safety technical requirements of the machine.

Description

Technical Field

[0001] The invention belongs to the field of agricultural machinery, in particular to a safety interlocking device for a micro-tillage machine. Background Art

[0002] Small agricultural mechanization, especially hand-held tractors and micro-tillage machines, because the operator follows the machine, when the machine is in reverse gear, the rotating rotary tiller will cause great danger to the operator, so this type of machine must have a safety interlock device for reverse gear and rotary tillage to ensure the personal safety of the operator. The function of the interlock device is: when the reverse gear is engaged, the rotary tillage will automatically jump to neutral gear; when the rotary tillage is engaged, it will not be in reverse gear. Some existing solutions use the travel gear lever and the rotary tillage gear lever outside the gearbox to interlock, and some machines use a separate reverse gear control lever. When the machine needs to move backward, it is engaged in reverse gear. When it needs to stop moving backward or finds danger and needs to stop moving backward, as long as the operator releases the reverse gear lever, the machine will stop moving backward immediately. Comparative document 1, application number: CN201210242720, invention name: A speed change mechanism for a micro-tiller, comprising a driving shaft, a driven shaft, a reverse shaft, a shift fork shaft and an output shaft, the driving shaft being provided with a belt driven wheel and a driving triple gear that can move axially along the driving shaft, the driven shaft being provided with a clutch gear that can move axially along the driven shaft, a driven triple gear that rotates with the clutch and a driven shaft output gear fixed on the driven shaft, the reverse shaft being provided with a reverse gear, the shift fork shaft being provided with a shift fork, and the output shaft being provided with a driving gear that is constantly meshed with the driven shaft output gear; the driving triple gear being provided with a slide groove that matches with the shift fork, the driving triple gear being meshed with the driven triple gear in a single corresponding manner under the action of the shift fork, and the side surface of the driven shaft triple gear being provided with a clamping groove that can be clamped with the clutch gear to form a whole. Comparative document 2, application number: CN202232038U, invention name: Multifunctional front-rotating and rear-drive gear-driven tilling machine, comprising a frame, a diesel engine, a handrail frame, a rolling wheel and a rotary tiller, wherein the diesel engine is mounted on the frame, a handrail frame is mounted on one side of the frame, tilling implements and rolling wheels are mounted on the front and rear parts of the lower end of the frame respectively, and the transmission mechanism of the diesel engine drives the rolling wheels and the tilling implements through the first gear transmission mechanism in the gearbox and the second gear transmission mechanism in the rotary tiller box respectively. Comparative Document 3, Application No.: CN201120178898, Invention Name: A transmission device in a tiller, including an engine, a transmission box and an armrest fixing seat, the engine is connected with a small pulley, the small pulley is connected with a large pulley through a forward belt and a reverse belt, the forward belt is equipped with a forward tensioning wheel, the reverse belt is equipped with a reverse pulley, the large pulley is connected to the transmission box through a worm; the worm is connected to the output shaft through a worm wheel; the forward tensioning wheel is fixed to the armrest fixing seat through a forward tensioning arm; the engine is equipped with a belt guard plate, a cable pull plate and a reverse seat plate. The technical scheme and technical features disclosed in the comparative document are neither the same nor similar to those of the present case. Summary of the invention

[0003] The purpose of the present invention is to provide a double gear that integrates the original I gear / reverse gear and a rotary tillage driving gear next to it, so that it can be arranged in an appropriate position. See the attached figure. This arrangement can achieve that when the reverse gear is engaged, the rotary tillage must be in neutral gear; when the rotary tillage is engaged, the reverse gear must jump out of the gear. The interlocking device is designed inside the gearbox to solve the interlocking problem of the reverse gear and the rotary tillage from the source. It has reliable function, easy processing and manufacturing, no need to add any parts, and simple and convenient operation.

[0004] The technical solution of the present invention is as follows: a safety interlock device for a micro-tillage machine comprises a reverse gear driven gear, a reverse gear driving gear, a Ⅱ shaft Ⅰ gear / reverse gear driven gear, a Ⅱ shaft rotary tillage driving gear, a Ⅱ shaft rotary tillage driven gear, an Ⅱ shaft rotary tillage driven gear, an Ⅰ shaft Ⅰ gear / reverse gear driving gear, an Ⅰ shaft rotary tillage driving gear, a Ⅱ gear Ⅲ gear first driven gear, a Ⅱ gear Ⅲ gear first driving gear, a Ⅱ gear Ⅲ gear second driving gear, a first thrust sleeve, a second thrust sleeve, a bearing cover, an Ⅰ shaft bearing, a Ⅱ shaft bearing, a Ⅱ gear Ⅲ gear second driven gear, a reverse shaft, an Ⅰ shaft, an Ⅱ shaft, and a gearbox, wherein the reverse gear driving gear 2 and the reverse gear driven gear 1 are double gears, which rotate radially on a reverse shaft 17 and are fixed axially, the reverse gear driving gear 2 and the Ⅱ shaft Ⅰ gear / reverse gear driven gear 3 are a pair of constantly meshing gears, the Ⅰ shaft 18 is a spline shaft, the Ⅱ gear Ⅲ gear first driving gear 9, the Ⅱ gear Ⅲ gear first driving gear, the Ⅱ gear Ⅲ gear second driving gear, the first thrust sleeve, the second thrust sleeve, a bearing cover, an Ⅰ shaft bearing, a Ⅱ shaft bearing, a Ⅱ gear Ⅲ gear second driven gear, a reverse shaft, an Ⅰ shaft, an Ⅱ shaft, and a gearbox, wherein the reverse gear driving gear 2 and the reverse gear driven gear 1 are double gears, which rotate radially on a reverse shaft 17 and are fixed axially, the reverse gear driving gear 2 and the Ⅱ shaft Ⅰ gear / reverse gear driven gear 3 are a pair of constantly meshing gears, the Ⅰ shaft 18 is a spline shaft, the Ⅱ gear Ⅲ gear first driving gear 9, the Ⅱ gear Ⅲ gear The second driving gear 10 is a double gear, which slides axially on the spline of the I shaft 18, and is respectively engaged in the I gear, II gear and / or III gear. The I shaft I gear / reverse gear driving gear 6 and the I shaft rotary tillage driving gear 7 are I gear / reverse gear / rotary tillage double gears, which slide axially on the spline of the I shaft 18 to achieve I gear, reverse gear and rotary tillage. The first driven gear 8 of the II gear and III gear and the second driven gear 16 of the II gear and III gear are installed on the II shaft 19 and rotate on the II shaft 19. The II shaft rotary tillage driving gear 4 and the II shaft rotary tillage driven gear 5 are double gears, and their inner apertures are installed on the II shaft bearing 15, and the II shaft bearing 15 is installed on the outer diameter of the II shaft 19 and rotates. The I shaft bearing 14 is installed on the inner diameter of the bearing cover 13, and the I shaft bearing 14 is installed on the inner diameter of the I shaft bearing 14. The I shaft 18 is installed. The first driven gear 8 of the II gear and III gear is meshed and transmitted to the travel drive wheel, and the II shaft rotary tillage driving gear 4 meshes with the rotary tillage shaft to the rotary tillage knife.

[0005] The transmission route is:

[0006] Gear I: shaft I 18 → shaft I gear / reverse gear driving gear 6 → shaft II gear / reverse gear driven gear 3… → travel wheel;

[0007] Reverse gear: I shaft 18 → I shaft I gear / reverse gear driving gear 6 → reverse gear driven gear 1 → reverse gear driving gear 2 → II shaft I gear / reverse gear driven gear 3… → travel wheel;

[0008] Rotary tillage: I axis 18 → I axis rotary tillage driving gear 7 → II axis rotary tillage driven gear 5 → II axis rotary tillage driving gear 4 → rotary tillage shaft → rotary tillage blade;

[0009] Engage in reverse gear: the I-axis rotary tillage driving gear 7 and the II-axis rotary tillage driven gear 5 are disengaged, the rotary tillage gear is engaged, and the reverse gear is automatically disengaged, so that the reverse gear and rotary tillage are interlocked, and the power input realizes the reverse gear and / or rotary tillage;

[0010] Power input:

[0011] 1) Power input → I shaft 18 → I shaft I gear / reverse gear driving gear 6 → (1), II shaft I gear / reverse gear

[0012] Driven gear 3 → II shaft 19 → II shaft III gear first driven gear 8 ... travel drive wheel I gear, (2) reverse gear driven gear 1 → reverse gear driving gear 2 → II shaft I gear / reverse gear driven gear 3 reverse gear, in the above (1) and (2), power will only be transmitted to one of the travel and reverse gears;

[0013] 2) Power input → I shaft 18 → I shaft rotary tillage driving gear 7 → II shaft rotary tillage driven gear 5 → II shaft rotary tillage driving gear 4…rotary tillage blade, will not be transmitted to both at the same time.

[0014] Its parameters are:

[0015] 1) The main parameters of the rotary tillage of the II shaft 19 in the II and III gears, the first driven gear 8, and the second driven gear 16 in the II and III gears are:

[0016] M1=0.5~5.5 Z1=12~52 X1= 0.1~3 B1=2~30

[0017] M2=0.5~5.5 Z2=8~58 X2= 0.1~3 B2=9~39

[0018] 2) The main parameters of the I-axis 18, the I-axis 1st gear 1st / reverse gear driving gear 6, the I-axis rotary tillage driving gear 7, the II- and III-speed first driving gear 9, and the II- and III-speed second driving gear 10 are:

[0019] M1=0.5~5.5 Z1=12~52 X1= 0 B1=2~30

[0020] M2=0.5~5.5 Z2=8~58 X2= 0 B2=6~36

[0021] Φ inner hole = 20~60mm

[0022] 3) The tooth width of the I-axis I gear / reverse gear driving gear 6 and the I-axis rotary tillage driving gear 7 is more than 1 times the normal meshing tooth width.

[0023] Compared with the prior art, the outstanding effect of the present invention is that a new interlocking mechanism design scheme for reverse gear and rotary tillage interlocking can effectively prevent accidents in which the rotary tillage blade injures people when the machine is reversing. It has novel design, compact structure, safety and reliability, simple operation, convenient installation, easy manufacturing, and fully meets the safety technical requirements of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the assembled gear-engaging state of the present invention.

[0025] Figure 2 This is a schematic diagram of the I-axis I-gear / reverse gear combination of the present invention as a double gear.

[0026] Figure 3 It is a schematic diagram of the II-axis double gear of the present invention.

[0027] Figure 4 It is a schematic diagram of the full-tooth-width meshing of the rotary tillage transmission gear of the present invention.

[0028] Figure 5 It is a schematic diagram showing that the rotary tillage transmission gear of the present invention is completely disengaged from the meshing rotary tillage shaft and does not rotate at all when the reverse gear is engaged.

[0029] Figure 6 It is a schematic diagram of the overall structural assembly of the present invention.

[0030] Figure numerals: reverse driven gear 1, reverse driving gear 2, II shaft I gear / reverse driven gear 3, II shaft rotary tillage driving gear 4, II shaft rotary tillage driven gear 5, I shaft I gear / reverse driving gear 6, I shaft rotary tillage driving gear 7, II gear III gear first driven gear 8, II gear III gear first driving gear 9, II gear III gear second driving gear 10, first thrust sleeve 11, second thrust sleeve 12, bearing cover 13, I shaft bearing 14, II shaft bearing 15, II gear III gear second driven gear 16, reverse gear shaft 17, I shaft 18, II shaft 19, gearbox 20. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings

[0032] Embodiment 1, using a double gear at different axial positions of shaft I 18 to obtain different transmission routes to achieve the interlocking of reverse gear and rotary tillage. If gear I is engaged, shaft I gear I / reverse gear driving gear 6 meshes with shaft II gear I / reverse gear driven gear 3, and the power from shaft I 18 is transmitted from shaft I gear I / reverse gear driving gear 6 to the gear of shaft II gear I / reverse gear driven gear 3, and the first driven gear 8 of shaft II gear III gear is then driven by shaft II rotary tillage driven gear 5 to drive the travel drive wheel, and the rotary tiller moves forward in gear I. At the same time, shaft I rotary tillage driving gear 7 meshes with shaft II rotary tillage driven gear 5 with full tooth width, and the gear power is transmitted to the rotary tillage shaft through shaft II rotary tillage driving gear 4 until the rotary tillage blade performs rotary tillage operation. The inner holes of shaft II rotary tillage driving gear 4 and shaft II rotary tillage driven gear 5 are equipped with rolling shaft II bearing 15, and the rotary tillage transmission route and the travel transmission route will not interfere with each other, see the attached figure. If the gearshift lever is in reverse gear, the shift fork will slide the double gears of the I-axis I-gear / reverse gear driving gear 6 and the I-axis rotary tillage driving gear 7 to the right, with a sliding distance of 2~30mm. At this time, the I-axis I-gear / reverse gear driving gear 6 is meshed with the reverse gear driven gear 1, realizing the reverse gear. At the same time, the I-axis rotary tillage driving gear 7 is disengaged from the II-axis rotary tillage driven gear 5, disconnecting the rotary tillage transmission line, and the rotary tillage blade does not rotate. The operator can hold the clutch operating handle with one hand and the steering handle with the other hand to safely operate the machine to go straight or turn, without worrying about the rotary tillage blade hurting people, see the attached figure. If the II or III gears are respectively engaged, it can be seen from the design scheme of the safety interlock device of this micro-tillage machine that the II-axis rotary tillage driven gear 5 and the I-axis I-gear / reverse gear driving gear 6 are still meshed with half a tooth width, and the power can be transmitted to the rotary tillage blade. If the gearshift lever is in neutral, it can be seen from the scheme that the power can still be transmitted to the rotary tillage shaft to rotate the rotary tillage blade. The designed gear mechanism can make the rotary tiller shaft rotate forward, reverse or stop (neutral gear), which provides convenience for the operator to use the rotary tiller shaft to rotate forward or reverse to shake off the weeds entangled on the shaft when necessary, and also leaves room for expanding the range of the machine.

[0033] Example 2, refer to Example 1, refer to the accompanying drawings.

[0034] 1. Attachment Figure 1 When the machine is in neutral gear, the II axis rotary tillage driving gear 4 and the I axis I gear / reverse gear 6 still have more than 50% of the tooth width meshing, and the rotary tillage gear mechanism can be in forward, reverse or neutral gear, and the weeds wrapped around the rotary tillage shaft can be thrown off by the rotation of the rotary tillage shaft. The transmission gear strength is sufficient, and the rotary tillage can be normally transmitted when the II gear and III gear are engaged.

[0035] 2. Attachment Figure 2 The I-axis rotary tillage driving gear 7 and the I-axis I-speed / reverse gear driving gear 6 are combined into

[0036] Double.

[0037] 3. Attachment Figure 3It is the II-axis rotary tillage driven gear 5.

[0038] 4. Attachment Figure 4 The rotary tillage transmission gear of shaft Ⅰ 18 is meshed with full tooth width.

[0039] 5. Attachment Figure 5 When the reverse gear is engaged, the rotary tillage transmission gear is completely disengaged.

[0040] The rotary tillage shaft does not rotate at all.

[0041] Its transmission mode: The single gear on the I shaft 18, the I gear / reverse gear and the rotary tillage on the I shaft 18

[0042] The driving gear is integrated into a double gear; The tooth width of the rotary tillage driving and driven gears on shafts I 18 and II 19 is increased by more than 2 mm from the original 10 mm to achieve the interlocking of reverse gear and rotary tillage, which can fully guarantee the personal safety of the operator. This solution has good process inheritance and economy.

[0043] Example 3, refer to Example 2, refer to the accompanying drawings.

[0044] 1. Attached figure: It is a simplified diagram of the design, which shows that the I, II, III and reverse gears are all in neutral. I shaft 18, II shaft 19 and reverse shaft 17 are arranged in a herringbone shape, the reverse driven gear 1 and the reverse driving gear 2 are double gears, which can rotate freely on the reverse shaft, but the axial position is fixed, and the II shaft I / reverse driven gear 3 and the reverse driving gear 2 are a pair of constant meshing gears. I shaft 18 is a spline shaft, the II and III first driving gear 9 and the II and III second driving gear 10 are double gears, which can slide axially on the spline shaft to engage the II or III gear respectively. The I-shaft I-gear / reverse gear driving gear 6 and the I-shaft rotary tillage driving gear 7 are I-gear / reverse gear / rotary tillage double gears, which can slide axially on the I-shaft 18 spline (I-shaft 18→I-shaft I-gear / reverse gear driving gear 6→reverse gear driven gear 1→reverse gear driving gear 2→II-shaft I-gear / reverse gear driven gear 3) to achieve I-gear, reverse gear and rotary tillage.

[0045] 2. Transmission route:

[0046] Gear I: shaft I 18 → shaft I gear / reverse gear driving gear 6 → shaft II gear / reverse gear driven gear 3… → travel wheel;

[0047] Reverse gear: I shaft 18 → I shaft I gear / reverse gear driving gear 6 → reverse gear driven gear 1 → reverse gear driving gear 2 → II shaft I gear / reverse gear driven gear 3… → travel wheel;

[0048] Rotary tillage: I-axis 18 → I-axis rotary tillage driving gear 7 → II-axis rotary tillage driven gear 5 → II-axis rotary tillage driving gear 4 → rotary tillage shaft → rotary tillage blade.

[0049] Engage in reverse gear: the I-axis rotary tillage driving gear 7 and the II-axis rotary tillage driven gear 5 are disengaged, the rotary tillage gear is engaged, and the reverse gear is automatically disengaged, so that the reverse gear and rotary tillage are interlocked, and the power input realizes the reverse gear and / or rotary tillage;

[0050] Power input:

[0051] 1) Power input → I shaft 18 → I shaft I gear / reverse gear driving gear 6 → (1), II shaft I gear / reverse gear

[0052] Driven gear 3 → II shaft 19 → II shaft III gear first driven gear 8 ... travel drive wheel I gear, (2), reverse gear driven gear 1 → reverse gear driving gear 2 → II shaft I gear / reverse gear driven gear 3 reverse gear, in the above (1) and (2), power will only be transmitted to one of the travel and reverse gears;

[0053] 2) Power input → I shaft 18 → I shaft rotary tillage driving gear 7 → II shaft rotary tillage driven gear 5 → II shaft rotary tillage driving gear 4 ... rotary tillage blade. It will not be transmitted to both at the same time.

[0054] 3. Its parameters are:

[0055] 1) The main parameters of the rotary tillage of the II shaft 19 in the II and III gears, the first driven gear 8, and the second driven gear 16 in the II and III gears are:

[0056] M1=0.5~5.5 Z1=12~52 X1= 0.1~3 B1=2~30

[0057] M2=0.5~5.5 Z2=8~58 X2= 0.1~3 B2=9~39

[0058] 2) The main parameters of the I-axis 18, the I-axis 1st gear 1st / reverse gear driving gear 6, the I-axis rotary tillage driving gear 7, the II- and III-speed first driving gear 9, and the II- and III-speed second driving gear 10 are:

[0059] M1=0.5~5.5 Z1=12~52 X1= 0 B1=2~30

[0060] M2=0.5~5.5 Z2=8~58 X2= 0 B2=6~36

[0061] Φ inner hole = 20~60mm

[0062] 3) The tooth width of the I-axis I gear / reverse gear driving gear 6 and the I-axis rotary tillage driving gear 7 is more than 1 times the normal meshing tooth width.

Claims

1. A safety interlock device for a micro-tillage machine, comprising a reverse gear driven gear, a reverse gear driving gear, a II shaft I gear / reverse gear driven gear, a II shaft rotary tillage driving gear, a II shaft rotary tillage driven gear, an I shaft I gear / reverse gear driving gear, an I shaft rotary tillage driving gear, a II gear III gear first driven gear, a II gear III gear first driving gear, a II gear III gear second driving gear, a first thrust sleeve, a second thrust sleeve, a bearing cap, an I shaft bearing, an II shaft bearing, a II gear III gear second driven gear, a reverse shaft, an I shaft, an II shaft, and a gearbox, characterized in that The reverse gear driving gear (2) and the reverse gear driven gear (1) are double gears, which rotate in the radial direction of the reverse gear shaft (17) and are fixed in the axial direction. The reverse gear driving gear (2) and the Ⅱ shaft Ⅰ gear / reverse gear driven gear (3) are a pair of constantly meshed gears. The Ⅰ shaft (18) is a spline shaft. The Ⅱ gear Ⅲ gear first driving gear (9) and the Ⅱ gear Ⅲ gear second driving gear (10) are double gears, which slide axially on the spline of the Ⅰ shaft (18) to respectively engage the Ⅰ gear, Ⅱ gear and / or Ⅲ gear. The Ⅰ shaft Ⅰ gear / reverse gear driving gear (6) and the Ⅰ shaft rotary tillage driving gear (7) are Ⅰ gear / reverse gear / rotary tillage double gears, which slide axially on the spline of the Ⅰ shaft (18) to achieve the Ⅰ gear and reverse gear. and rotary tillage, the first driven gear (8) of the II and III gears and the second driven gear (16) of the II and III gears are mounted on the II shaft (19) and rotate on the II shaft (19), the II shaft rotary tillage driving gear (4) and the II shaft rotary tillage driven gear (5) are double gears, the inner diameter of which is mounted on the II shaft bearing (15), the II shaft bearing (15) is mounted on the outer diameter of the II shaft (19) and rotates, the inner diameter of the bearing cover (13) is mounted on the I shaft bearing (14), the inner diameter of the I shaft bearing (14) is mounted on the I shaft (18), the first driven gear (8) of the II and III gears is meshed and transmitted to the travel drive wheel, the II shaft rotary tillage driving gear (4) is meshed with the rotary tillage shaft to the rotary tillage blade, and the transmission route is: ① Gear I: Shaft I (18) → Shaft I Gear I / Reverse Gear Drive Gear (6) → Shaft II Gear I / Reverse Gear Driven Gear (3) → Traveling Wheel; ② Reverse gear: I shaft (18) → I shaft I gear / reverse gear driving gear (6) → reverse gear driven gear 1 → reverse gear driving gear (2) → II shaft I gear / reverse gear driven gear (3) → travel wheel; ③ Rotary tillage: I shaft (18) → I shaft rotary tillage driving gear (7) → II shaft rotary tillage driven gear (5) → II shaft rotary tillage driving gear (4) → rotary tillage shaft → rotary tillage blade; ④ Engage in reverse gear: the rotary tillage driving gear (7) of the first axis and the rotary tillage driven gear (5) of the second axis are disengaged, the rotary tillage gear is engaged, and the reverse gear is automatically disengaged, so that the reverse gear and the rotary tillage are interlocked, and the power input realizes the reverse gear and / or rotary tillage; ⑤Power input: 1) Power input → I shaft (18) → I shaft I gear / reverse gear driving gear (6) → ①, II shaft I gear / reverse gear driven gear (3) → II shaft (19) → II shaft III gear first driven gear (8) → travel drive wheel I gear, ②, reverse gear driven gear (1) → reverse gear driving gear (2) → II shaft I gear / reverse gear driven gear (3) reverse gear. In the above ① and ②, the power will only be transmitted to one of the travel and reverse gears; 2) Power input → I shaft (18) → I shaft rotary tillage driving gear (7) → II shaft rotary tillage driven gear (5) → II shaft rotary tillage driving gear (4) → rotary tillage blade; Its parameters are: 1) The main parameters of the first driven gear (8) of the rotary tillage of the II shaft (19) in the II and III gears and the second driven gear (16) in the II and III gears are: M1=0.5~5.5 Z1=12~52 M2=0.5~5.5 Z2=8~58 2) The main parameters of the I-axis I gear / reverse gear driving gear (6) of the I-axis (18), the I-axis rotary tillage driving gear (7), the II- and III-speed first driving gear (9) and the II- and III-speed second driving gear (10) are: M1=0.5~5.5 Z1=12~52 M2=0.5~5.5 Z2=8~58 Φ inner hole = 20~60mm 3) The tooth width of the I-axis I gear / reverse gear driving gear (6) and the I-axis rotary tillage driving gear (7) is more than 1 times the normal meshing tooth width.

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