CN217814915U - Mini-tiller and speed change mechanism thereof - Google Patents

Abstract

The utility model discloses a plough machine and speed change mechanism a little, its characterized in that: the transmission device comprises a transmission main shaft, an auxiliary shaft and a reverse shaft, wherein one end of the transmission main shaft is connected with an engine in a transmission manner, the other end of the transmission main shaft is connected with a starting motor in a transmission manner, more than one pair of gear pairs are arranged between the transmission main shaft and the auxiliary shaft, at least one pair of gear pairs are arranged between the transmission main shaft and the reverse shaft, and at least one pair of gear pairs are arranged between the reverse shaft and the auxiliary shaft. The utility model provides a plough machine a little and speed change mechanism thereof has the advantage that starts reliably, power transmission is reliable and the follow-up maintenance of being convenient for.

Description

Mini-tiller and speed change mechanism thereof

Technical Field

The utility model relates to agricultural machinery, especially, relate to plough quick-witted and the speed change mechanism of ploughing machine a little.

Background

The mini-tiller takes a small diesel engine or a gasoline engine as power, and has the characteristics of light weight, small volume, simple structure and the like. The micro-farming machine is widely applicable to dry land, paddy field, orchard and the like in plains, mountainous areas and hills. The corresponding machines are matched for water pumping, legal, pesticide spraying, land cultivation and other operations. The mini-tiller can freely run in the field, is convenient to use and store, saves the trouble that large agricultural machinery cannot enter a mountain field, and is the best choice for vast farmers to replace cattle farming.

At present, the mini-tiller is usually started by a pull disc, a main shaft in a gearbox is driven to rotate by the pull disc, and then a diesel engine or a gasoline engine is driven to start by the main shaft. Or the pull disc is directly adopted to start the diesel engine or the gasoline engine, or a middle shaft is arranged between the pull disc and the diesel engine or the gasoline engine, and the diesel engine or the gasoline engine is started after the middle shaft is started through the pull disc. In addition, the existing scheme also adopts electric starting, and the diesel engine or the gasoline engine is directly driven by starting the motor, or the diesel engine or the gasoline engine is driven by driving the intermediate shaft by the motor. In order to realize starting in the prior art, a starting pull disc or a starting motor is usually arranged on the same side of the mini-tiller, which is usually the front side of a gearbox. The problem of such an arrangement is that: the gravity center of the mini-tiller is too forward, the structure is too compact, the heat generated by the working of the gasoline engine or the oil extraction machine can be transferred to the starting motor or the pull disc, and impurities can be easily introduced into the pull disc or the starting motor in the working process.

Chinese patent CN207297827U discloses a transmission mechanism of a mini-tiller, and specifically discloses: the speed change mechanism arranged in the speed change cavity is a three-gear speed change mechanism and specifically comprises a main shaft, a secondary shaft and an output shaft which are arranged in parallel. The main shaft is connected with the power input shaft through a straight gear pair and obtains power, a main shaft duplex gear is further arranged on the main shaft, the main shaft duplex gear is connected with a main shaft spline and can slide along the axial direction of the main shaft, and a driving mechanism for driving the main shaft duplex gear to slide along the axial direction is further connected on the main shaft duplex gear. The middle part of the auxiliary shaft is fixedly provided with a first middle tooth which can be in meshing transmission with a large gear of the main shaft duplex tooth, one end of the auxiliary shaft is fixedly provided with a second middle tooth which can be in meshing transmission with a small gear of the main shaft duplex tooth, in addition, the other end of the auxiliary shaft is also fixedly provided with a third middle tooth which is in meshing transmission with an output gear fixedly connected on the output shaft. And an output shaft duplex gear is also sleeved on the output shaft in a hollow manner, a small gear of the output shaft duplex gear is in meshing transmission with the middle gear II, and a large gear of the output shaft duplex gear can be in meshing transmission with a large gear of the main shaft duplex gear. In addition, the output end of the output shaft is also provided with the driving bevel gear through a spline, and the driving bevel gear is in meshing transmission with the driven bevel gear of the input shaft of the transmission mechanism. Through the setting of above-mentioned speed change mechanism, realized three grades of variable speeds, wherein two keep off for the corotation is advanced and is kept off, and another keeps off for the reversal reverse gear, and its transmission route is as follows: a first gear: the main shaft duplex gear big gear → the auxiliary shaft middle gear I (driving the auxiliary shaft to rotate) → the auxiliary shaft middle gear III → the output shaft output gear (driving the output shaft to rotate) → the driving bevel gear → the driven bevel gear. The power is output through the driven bevel gear and forward rotation is achieved. A second gear: the double-tooth pinion of the main shaft → the second middle tooth of the auxiliary shaft (driving the auxiliary shaft to rotate) → the third middle tooth of the auxiliary shaft → the output gear of the output shaft (driving the output shaft to drive) → the driving bevel gear → the driven bevel gear. The power is output through the driven bevel gear and forward rotation is achieved. Gear three: the double-tooth pinion of the main shaft → the big gear wheel of the double-tooth of the output shaft → the small gear wheel of the double-tooth of the output shaft → the middle tooth of the auxiliary shaft II (driving the auxiliary shaft to rotate) → the middle tooth of the auxiliary shaft III → the output gear of the output shaft (driving) → the driving bevel gear → the driven bevel gear. The power is output through the driven bevel gear and reverse rotation and reverse direction are realized.

The transmission mechanism in the above patent also employs three shafts, but the transmission path in the above patent is too complicated and the number of transmission stages is too large. The main shaft in the above patent needs to obtain power through another power input shaft and another gear pair, resulting in that the whole speed change mechanism and transmission mechanism are too tedious and complicated, and are not favorable for starting, power transmission and later maintenance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a start reliable, do benefit to quick-witted speed change mechanism is ploughed a little of power transmission.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a speed change mechanism of machine is ploughed a little which characterized in that: the transmission device comprises a transmission main shaft, an auxiliary shaft and a reverse shaft, wherein one end of the transmission main shaft is connected with an engine in a transmission manner, the other end of the transmission main shaft is connected with a starting motor in a transmission manner, more than one pair of gear pairs are arranged between the transmission main shaft and the auxiliary shaft, at least one pair of gear pairs are arranged between the transmission main shaft and the reverse shaft, and at least one pair of gear pairs are arranged between the reverse shaft and the auxiliary shaft. By adopting the speed change mechanism, the effects of reliable starting, convenient power transmission and more optimized structure can be achieved,

Furthermore, a main transmission duplicate gear is axially and slidably arranged on the transmission main shaft, the main transmission duplicate gear is in transmission connection with the transmission main shaft, and a main transmission driven gear I in meshing fit with a large gear of the main transmission duplicate gear and a main transmission driven gear II in meshing fit with a small gear of the main transmission duplicate gear are fixedly arranged on the auxiliary shaft.

In order to further optimize the structure, the first main-gear driven gear and the second main-gear driven gear are duplicate gears.

In order to further shorten the transmission route and optimize the structure, an intermediate gear in meshing fit with a large gear or a small gear of the main transmission duplicate gear and a reverse gear in meshing fit with the main transmission driven gear II or the main transmission driven gear I are arranged on the reverse gear shaft.

Furthermore, the speed change mechanism further comprises a speed change driving mechanism, the speed change driving mechanism comprises a speed change shifting fork shaft, a speed change shifting fork is arranged on the speed change shifting fork shaft in a sliding mode, one end of the speed change shifting fork acts on the main speed change dual gear, the other end of the speed change shifting fork is connected with a middle L rod, and the other end of the middle L rod is connected with a speed change driving handle.

Furthermore, the auxiliary shaft is longitudinally arranged and also comprises an output shaft which is vertically arranged, and the upper end of the output shaft is in transmission connection with one end of the auxiliary shaft through a bevel gear.

Preferably, the device also comprises an operation shaft, wherein the operation shaft is transversely arranged, and the middle part of the operation shaft is in transmission connection with the tail part of the output shaft through a pair of bevel gears.

In order to further improve the starting reliability and optimize the structure, the transmission main shaft is longitudinally arranged, the engine is arranged at the front end of the transmission main shaft, the starting motor is arranged at the rear end of the transmission main shaft, the starting motor is in transmission connection with the transmission main shaft through a pair of reduction gears, and the engine is in transmission connection with the transmission main shaft through a clutch.

Preferably, the clutch comprises a shell connected with an output shaft of the engine, a friction plate assembly connected with one end of the transmission main shaft and positioned in the shell, and a pressure plate axially acting on the friction plate assembly; still include right pressure disk driven starts actuating mechanism, it includes the start shifting fork axle and installs start shifting fork on the shifting fork axle to start actuating mechanism, start the shifting fork and act on the terminal surface of pressure disk, the one end of starting the shifting fork axle is connected with the start handle.

A mini-tiller comprises the speed change mechanism.

Has the advantages that:

by adopting the speed change mechanism of the mini-tiller, the mini-tiller can be started easily without manual starting; secondly, the reliability of starting can be improved; thirdly, the engine and the starting motor are arranged in front and at the back, so that the reliability of the whole structure can be improved, and the space can be saved and the layout can be optimized; and fourthly, the starting motor is arranged at the rear part far away from the engine, so that the performance of the starting motor is prevented from being influenced due to the heat of the engine, and sundry sludge is prevented from entering the starting motor in the plowing process. Fifth, the utility model provides a transmission route is shorter, improves the transmission reliability to optimize drive mechanism's structure, utilized follow-up maintenance and saved the space.

The utility model discloses in, the direction that advances when using the machine of ploughing a little is preceding, and the operation side is the back when using the machine of ploughing a little when ploughing a little, and the fore-and-aft direction is vertical, and left and right directions is horizontal, and upper and lower direction is vertical.

Drawings

FIG. 1 is a first isometric view of a starting mechanism of the mini-tiller;

FIG. 2 is a second perspective view of a starting mechanism of the mini-tiller;

FIG. 3 is a rear view of the starting mechanism of the mini-tiller;

FIG. 4 is a cross-sectional view C-C of FIG. 3;

FIG. 5 is a first perspective view of a speed change mechanism of the mini-tiller;

FIG. 6 is a second perspective view of the transmission mechanism of the mini-tiller;

FIG. 7 is a partial enlarged view of the speed change mechanism of the mini-tiller;

FIG. 8 is a right side view of the gearbox housing of the mini-tiller;

FIG. 9 is a rear view of the gearbox housing of the mini-tiller;

FIG. 10 is a cross-sectional view D-D of FIG. 9;

FIG. 11 is a first isometric view of a starter motor end cap;

FIG. 12 is an isometric view of a starter motor end cap;

FIG. 13 is a right side view of the mini-tiller gearbox (including the starting mechanism and the shifting mechanism);

FIG. 14 is a rear view of the mini-tiller gearbox (including the starting mechanism and the shifting mechanism);

figure 15 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of figure 14.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or replacements within the basic spirit of the embodiments still fall within the scope of the present invention claimed in the claims.

The embodiment is as follows: as shown in fig. 1-15, the present embodiment provides a mini-tiller, a starting mechanism of the mini-tiller, a speed change mechanism of the mini-tiller, and a gearbox of the mini-tiller.

1. Starting mechanism for mini-tiller

The starting mechanism of the mini-tiller in the embodiment is connected with the speed change mechanism. The starting mechanism in this embodiment comprises a transmission main shaft 1, which is at the same time the power input shaft, i.e. the main shaft, of the gear shifting mechanism. The transmission main shaft is located in a gearbox body of the speed change mechanism and supported on the gearbox body through a bearing, one end of the transmission main shaft is connected with a starting motor 2, and the other end of the transmission main shaft is connected with an engine (not shown in the figure). Wherein, the engine can be a diesel engine or a gasoline engine.

In this embodiment, the transmission main shaft is longitudinally arranged in the front and back direction, and the engine and the starting motor are respectively arranged at the front end and the back end of the transmission main shaft. The engine can be selectively arranged at the front end of the transmission main shaft, and the starting motor is arranged at the rear end of the transmission main shaft, or the engine can be selectively arranged at the rear end of the transmission main shaft, and the starting motor is arranged at the front end of the transmission main shaft. In the embodiment, the engine is selectively arranged at the front end of the transmission main shaft, and the starting motor is arranged at the rear end of the transmission main shaft.

The starting motor and the transmission main shaft can be directly connected through a coupling or connected through other transmission mechanisms. In this embodiment, the starting motor is in transmission connection with the transmission main shaft through a speed reducing mechanism. In this embodiment, the reduction mechanism is more than one pair of reduction gear pairs, which may be one pair, two pairs, three pairs or more. In this embodiment, a pair of reduction gear pairs is provided between the output shaft of the starter motor and the transmission main shaft. Specifically, the method comprises the following steps: a one-way gear 3 is arranged on an output shaft (not shown in the figure) of the starting motor, a driven gear 4 is arranged at the rear end of the transmission main shaft, and the power of the starting motor is transmitted to the transmission main shaft through the meshing of the one-way gear and the driven gear and is reduced.

It should be noted that: when the starting motor is not started, the one-way gear and the driven gear are in a normally separated state, and the one-way gear is located at the rear end of the driven gear. When the starting motor is started, the single gear moves forwards to be meshed with the driven gear and transmits power and torque to the driven gear, and the driven gear is in a passive state; then after the driven gear drives the engine to start, the engine directly drives the transmission main shaft to rotate, at the moment, the driven gear is in a driving state relative to the one-way gear, the one-way gear loses the meshing force with the driven gear and returns to the rear of the driven gear, and then the starting motor is turned off. The structure of the one-way gear and the output shaft of the starter motor is the prior art and is not described herein again.

The one-way gear and the driven gear can be cylindrical gears which are matched with each other, and can also be bevel gears which are matched with each other. If the starting motor is arranged behind the transmission main shaft, the power of the starting motor can be transmitted to the transmission main shaft by adopting a cylindrical gear. If the starting motor is arranged on the left side, the right side, the upper side or the lower side behind the transmission main shaft, the power of the starting motor can be transmitted to the transmission main shaft by adopting a bevel gear, and the reversing of a transmission route is realized. In the attached drawings of this embodiment, the one-way gear and the driven gear both adopt cylindrical gears, the starting motor is disposed behind the transmission main shaft, and an axis of an output shaft of the starting motor is parallel to an axis of the transmission main shaft.

In addition, the engine is in transmission connection with the front end of the transmission main shaft through a clutch 5. Through the clutch, the power connection and disconnection between the engine and the transmission main shaft can be realized. Specifically, the method comprises the following steps: the output shaft of the engine is in transmission connection with the housing of the clutch, and in this embodiment, the output shaft of the engine (not shown in the figure) can be connected with the inner wall of the shaft neck of the housing 51 of the clutch in an internal and external spline mode. The front end of the drive spindle may be supported by bearings against the inner wall of the housing of the clutch at the journal. The opening of the clutch housing faces the transmission main shaft. Friction disc subassembly 52 transmission of clutch is connected on the transmission main shaft and is located the casing of clutch, the clutch still including be located friction disc subassembly rear side and cup joint are in transmission main epaxial pressure disk 53. The driving mechanism 6 is started to drive the pressure plate to move axially, the pressure plate is pressed against the friction plate assembly, the transmission main shaft is connected with an output shaft of an engine in a transmission mode, the engine is started through the transmission main shaft, and the transmission main shaft is driven to rotate after the engine is started. When the pressure plate of the clutch is not pressed on the friction plate assembly, the transmission main shaft and the engine output shaft are in a power separation state, and the engine cannot be started by the rotation of the transmission main shaft.

As an implementation manner in this embodiment, the starting driving mechanism 6 includes a starting shifting fork 61 and a starting shifting fork shaft 62, the starting shifting fork is fixedly sleeved on the starting shifting fork shaft, the starting shifting fork shaft is transversely arranged, one end of the starting shifting fork shaft extends out of the gearbox body, and one end of the starting shifting fork shaft extending out of the gearbox body is connected with a starting handle 63.

As one of the implementation manners in this embodiment, the one end of the pressure plate, which is far away from the engine, is provided with a sleeve which extends outwards, the outer wall of the sleeve is provided with a bearing 54, the sleeve is far away from the transmission main shaft on one side of the engine, and a shifting fork block 64 is sleeved on the transmission main shaft on one side of the sleeve, and a clamp spring 65 is fixedly connected to the transmission main shaft on one side of the shifting fork block, which is far away from the engine. The outer wall of the shifting fork block is square, two fork angles of the starting shifting fork are clamped on two opposite outer side walls of the shifting fork block, the starting handle is rotated to drive the starting shifting fork to axially push a bearing arranged on the outer wall of a sleeve of the pressure plate, and then the pressure plate is pushed to compress the friction plate assembly, so that the transmission main shaft is in transmission connection with an output shaft of the engine. And the starting handle is rotated in the opposite direction, so that the friction plate assembly can be released from being pressed by the starting shifting fork, and further, the transmission connection between the output shaft of the engine and the transmission main shaft is released. In the present embodiment, the transmission connection refers to a connection between two shafts capable of transmitting power and torque.

By adopting the starting mechanism for the mini-tiller, before the mini-tiller is started, the transmission main shaft is in non-transmission connection with the output shaft of the engine, and the starting shifting fork does not push the pressure plate to compress the friction plate assembly. When the mini-tiller needs to be started: and rotating the starting handle (the step can be completed by operating the handle at the operating part of the mini-tiller) to enable the pressure plate of the clutch to press the friction plate assembly, so that the transmission main shaft is in transmission connection with the output shaft of the engine. And then starting a starting motor, wherein an output shaft of the starting motor rotates, the one-way gear moves forwards and is meshed with the driven gear to form a transmission and reduction mechanism, the transmission main shaft is driven to rotate through the reduction mechanism, the transmission main shaft drives the engine to start through the clutch, the transmission main shaft is directly driven to rotate through the engine after the engine is started, the one-way gear of the starting motor moves backwards and is separated from the driven gear, and the starting motor is turned off. In this way, the mini-tiller is started, and the transmission main shaft transmits power and torque to the tail end travelling mechanism and/or the tilling blade structure and the like through the speed change mechanism and the like.

By adopting the starting mechanism of the mini-tiller, the mini-tiller can be started easily without manual starting; secondly, the reliability of starting can be improved; thirdly, the engine and the starting motor are arranged in front and at the back, so that the reliability of the whole structure can be improved, and the space can be saved and the layout can be optimized; and fourthly, the starting motor is arranged at the rear part far away from the engine, so that the influence on the performance of the starting motor caused by the heat generated by the engine is avoided, and sundry sludge is prevented from entering the starting motor in the ploughing process.

2. Speed change mechanism of mini-tiller

The speed change mechanism in this embodiment can be started by using the starting mechanism in this embodiment, a transmission main shaft in the starting mechanism is used as a main shaft of the speed change mechanism in this embodiment, and the speed change mechanism further includes a counter shaft 7 and a reverse gear shaft 8 which are arranged in parallel with the transmission main shaft. In the present embodiment, two forward gears and one reverse gear are provided in common.

Specifically, the method comprises the following steps: the transmission main shaft is provided with main transmission duplex teeth 9 in transmission connection, and the main transmission duplex teeth can axially slide on the transmission main shaft through a variable speed driving mechanism. And a first main-gear driven gear 10 meshed and matched with a large gear 91 of the main-gear duplex gear and a second main-gear driven gear 11 meshed and matched with a small gear 92 of the main-gear duplex gear are arranged on the auxiliary shaft. The first main-gear driven gear and the second main-gear driven gear are both fixedly arranged on the auxiliary shaft. The first main speed change driving gear and the second main speed change driven gear can be two independent gears or can be a duplicate gear. In this embodiment, the first main-shift driven gear and the second main-shift driven gear are selected to be a duplicate gear fixedly mounted on the auxiliary shaft. In this embodiment, the main transmission duplex teeth are in transmission connection with the transmission main shaft through an internal spline and an external spline.

The reverse gear shaft is provided with an intermediate gear 12 and a reverse gear 13 which are fixedly connected with the reverse gear shaft, and the intermediate gear and the reverse gear can be two independent gears or a duplicate gear which is fixedly installed on the reverse gear shaft. In this embodiment, it is selected that the intermediate gear and the reverse gear are independently mounted on the reverse shaft.

The intermediate gear can be meshed and matched with a large gear or a small gear of the main gear double-linkage gear, power and torque are obtained from the transmission main shaft, then the reverse gear can be meshed and matched with a main gear driven gear II or a main gear driven gear I on the auxiliary shaft, and the power and the torque obtained by the reverse gear shaft are transmitted to the auxiliary shaft to realize reverse rotation so as to realize reverse gear. In this embodiment, the reverse gear on the reverse gear shaft and the second main transmission driven gear on the countershaft are in a normally engaged state, and the large teeth of the main transmission duplicate gear are engaged and matched with the intermediate teeth through axial slippage and transmit power and torque to the reverse gear shaft and further to the countershaft to realize reverse gear.

The variable-speed driving mechanism drives the main variable-speed duplicate gear to axially slide on the transmission main shaft, and can respectively realize that: neutral gear: namely, a main gear duplex gear large gear and a pinion are not meshed and matched with any gear of a main gear driven gear I, a main gear driving gear II and an intermediate gear, namely, power and torque on the transmission main shaft cannot be transmitted to the auxiliary shaft and the reverse gear shaft, and the main gear duplex gear idles on the transmission main shaft and is suitable for starting a mini-tiller. High-speed gear: the main gear of the main gear duplex gear is meshed with a main gear driven gear on the auxiliary shaft for transmission, and power and torque are transmitted to the auxiliary shaft from the transmission main shaft and are finally transmitted to a working part through the auxiliary shaft. Low-speed gear: the pinion of the main gear duplex gear is meshed with a main gear driven gear II on the auxiliary shaft for transmission, and power and torque are transmitted to the auxiliary shaft from the transmission main shaft and are finally transmitted to a working part through the auxiliary shaft. Reversing gear: the main gear of the main gear duplex gear is meshed with the intermediate gear on the reverse gear shaft for transmission, the reverse gear on the reverse gear shaft is meshed with the main gear driven gear on the auxiliary shaft for transmission, power and torque are transmitted to the reverse gear shaft from the transmission main shaft and then to the auxiliary shaft, and finally transmitted to the working part through the auxiliary shaft.

As one of the embodiments in this embodiment, the number of teeth of the intermediate gear is greater than the number of teeth of the large gear of the main-shift duplicate gear, and the number of teeth of the main-shift driven gear two is greater than the number of teeth of the reverse gear. Therefore, the rotation speed can be reduced during reverse gear, and accidental injury of a mini-tiller user is avoided.

As an embodiment of the present embodiment, the auxiliary shaft does not directly transmit power to the working member. The transmission mechanism further comprises an output shaft 14, which is arranged vertically and perpendicular to the secondary shaft, which is connected with the output shaft by means of bevel gears. Specifically, one end of the auxiliary shaft facing the center of the transmission main shaft is provided with a power output bevel gear 15, and the top end of the output shaft is provided with a power input bevel gear 16 in constant mesh transmission with the power input bevel gear. The tail end of the output shaft is connected with a working assembly.

The mini-tiller adopting the speed change mechanism in the embodiment is characterized in that the tail end of an output shaft of the speed change mechanism is connected with a walking shaft 17 of a walking device, the walking shaft is transversely arranged from left to right, the tail end of the output shaft is in transmission connection with the middle of the walking shaft through a bevel gear pair, and two ends of the walking shaft are respectively connected with walking wheels. Specifically, the method comprises the following steps: an output bevel gear 18 is arranged at the tail end of the output shaft, and an input bevel gear 19 meshed with the output bevel gear is arranged in the middle of the walking shaft.

As one of the embodiments in this embodiment, the speed change driving mechanism 20 includes a speed change fork shaft 201 parallel to the transmission main shaft, a speed change fork 202 is axially slidably disposed on the speed change fork shaft, one end of the speed change fork acts on the main-speed dual gear, the other end of the speed change fork is connected to one end of an intermediate L-shaped rod 203, and the other end of the intermediate L-shaped rod extends out of the box of the speed change mechanism and is connected to a speed change driving handle 204. The middle L rod is rotated by rotating the variable speed driving handle (the step can be completed by an operating handle at an operating part of the mini-tiller), the variable speed shifting fork is driven to axially slide on the variable speed shifting fork shaft in the rotating process of the middle L rod, and the main variable speed duplicate gear is driven to axially slide on the transmission main shaft by the axial movement of the variable speed shifting fork, so that the conversion of neutral gear, high gear, low gear and reverse gear is finally realized.

As one of the embodiments in this embodiment, the shift fork may act on an intermediate sleeve of the main shift double gear, or on a gearwheel or pinion of the main shift double gear. In the embodiment, two fork legs of the speed change shifting fork are clamped on a gear of the main speed dual gear close to the center of the transmission main shaft.

As one of the implementation manners in this embodiment, four positioning ring grooves 205 are circumferentially arranged on the speed change fork shaft, positioning holes 206 are formed in the speed change fork, the positioning holes are matched with the positioning ring grooves, the speed change driving mechanism further comprises a spring and a positioning ball (not shown), the positioning ball is located in the positioning hole, one end of the spring is connected with the positioning ball, and the other end of the spring is fixed on the box body or the shaft or other parts. Through the cooperation of location ball, locating hole and location spout, can realize the location when shifting. If the gear shifting fork slides to a certain gear, the positioning hole on the gear shifting fork is just opposite to the positioning ring groove, and the positioning ball is clamped into the positioning ring groove under the action of the elastic force of the spring to realize positioning. In this way, the reliability of the gear shift is improved.

With the transmission mechanism of the present embodiment, neutral, high, low, and reverse gears are provided. When the transmission mechanism is started, the transmission mechanism is located in a neutral gear through the transmission driving mechanism, and the transmission main shaft is in transmission connection with the output shaft of the engine through the clutch by starting the driving mechanism. Then, starting a starting motor, enabling a one-way gear on an output shaft of the starting motor to move forwards axially and to be in meshing transmission with a driven gear fixedly connected with the rear end of a transmission main shaft and to drive the transmission main shaft to rotate, further driving an engine to start through the transmission main shaft, driving the transmission main shaft to rotate by the engine after the engine is started, enabling the one-way gear to move backwards axially and to be separated from the driven gear, and stopping the starting motor, so that the starting of the mini-tiller is completed. After the mini-tiller is started, the speed change mechanism of the mini-tiller is driven by the speed change driving mechanism to select a high speed gear, a low speed gear or a reverse gear according to the use requirements of users. The speed change mechanism in the embodiment has simple and reliable speed change mode and compact structure and reasonable layout in the gearbox. One side of the speed change mechanism in the embodiment is a starting motor, and the other side of the speed change mechanism is an engine, so that the reliability in starting can be improved.

3. Gearbox body of mini-tiller

The gearbox body of the mini-tiller in the embodiment comprises a main gearbox body 21 and a gearbox body 22, the gearbox body is arranged below the gearbox body, an inner cavity of the gearbox body is communicated with an inner cavity of the gearbox body, an engine end cover 23 used for being connected with an engine is arranged on one side of the main gearbox body, and a starting motor end cover 24 used for being connected with a starting motor is arranged on the other side of the main gearbox body. In this embodiment, the front end of the main transmission case is connected to the engine cover, and the rear end of the main transmission case is connected to the motor cover.

Wherein a speed reduction chamber is provided at the rear side of the main transmission case, in the starter motor end cover or between the main transmission case and the starter motor end cover. The speed reduction chamber is used for installing a speed reduction mechanism between an output shaft of the starting motor and a transmission main shaft of the speed change mechanism. The position of the speed reduction chamber is determined according to the installation position of the starting motor.

As one embodiment of the present embodiment, the starter motor end cover has a lower chamber shell 241 communicating with the rear end of the main transmission case and an upper chamber shell 242 located above the lower chamber shell, and the upper chamber and the lower chamber of the starter motor end cover communicate with each other in the up-down direction and form the speed reduction chamber. The lower chamber shell is provided with an opening at one side connected with the main transmission box body, and the upper chamber shell is provided with a mounting hole 243 at one side deviated from the main transmission box body as an opening and at the edge. The end face of the upper chamber shell is connected with a starting motor, an output shaft of the starting motor extends into the upper chamber, and the one-way gear on the output shaft of the motor moves forwards axially and is located in the upper chamber when being started. The rear end of a transmission main shaft of the speed change mechanism extends into a lower cavity of the lower cavity shell, and a driven gear connected with the rear end of the transmission main shaft is located in the lower cavity.

As one of the embodiments in this embodiment, a convex mounting cavity housing 244 is provided on a side of the upper cavity housing facing the main transmission case, and a mounting cavity of the mounting cavity housing is communicated with the upper cavity. The mounting chamber housing is tapered. With this arrangement, the mounting of the conical head of the starter motor on the starter motor end cap is facilitated.

As one of the embodiments in this embodiment, a transverse partition plate 25 is disposed at a lower portion of the inner cavity of the main transmission case, and divides the inner cavity of the main transmission case into a first chamber at a side close to the engine end cover and a second chamber at a side close to the motor end cover, and a hole is disposed at a bottom of the first chamber and is communicated with the inner cavity of the transmission case. The bottom of the second cavity is provided with an opening, the top of the transmission case body is provided with a connecting plate 26 extending towards one side of the motor end cover, and the connecting plate seals the bottom opening of the second cavity and is connected with the main transmission case body. As one of the embodiments in this embodiment, a reinforcing rib is provided between the bottom of the connecting plate and the housing of the transmission case.

The auxiliary shaft and the reverse shaft are both mounted between the rear side wall of the main gearbox body and the transverse partition plate through bearings, the rear end of the transmission main shaft is supported on the rear side wall of the main gearbox body through the bearings, the front end of the transmission main shaft is supported in the shell of the clutch through the bearings, and the outer wall of a front end journal of the clutch shell is supported on the end cover of the engine through the bearings. The output shaft is vertically supported in the transmission case through a bearing.

The lower part of the inner cavity of the transmission case body is provided with a reversing chamber 27, the left side and the right side of the reversing chamber are transversely provided with holes 28, and the walking shaft penetrates through the transverse holes and is installed in the transmission case body through a bearing. The bottom of the reversing chamber is open and the opening is connected with a transmission case bottom cover 29.

The mini-tiller provided in the embodiment comprises the starting mechanism, the speed change mechanism and/or the gearbox body.

Finally, the above examples are intended only to illustrate the technical solution of the present invention and not to limit it, and although the present invention has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention defined by the appended claims.

Claims (12)

1. The utility model provides a speed change mechanism of machine is ploughed a little which characterized in that: the transmission device comprises a transmission main shaft, an auxiliary shaft and a reverse shaft, wherein an engine is connected to one end of the transmission main shaft in a transmission manner, a starting motor is connected to the other end of the transmission main shaft in a transmission manner, more than one pair of gear pairs are arranged between the transmission main shaft and the auxiliary shaft, at least one pair of gear pairs are arranged between the transmission main shaft and the reverse shaft, and at least one pair of gear pairs is arranged between the reverse shaft and the auxiliary shaft.

2. The speed change mechanism of the micro-cultivator of claim 1, wherein: the transmission device is characterized in that a main transmission duplicate gear is axially and slidably arranged on the transmission main shaft, the main transmission duplicate gear is in transmission connection with the transmission main shaft, and a main transmission driven gear I in meshing fit with a large gear of the main transmission duplicate gear and a main transmission driven gear II in meshing fit with a small gear of the main transmission duplicate gear are fixedly arranged on the auxiliary shaft.

3. The speed change mechanism of the micro-cultivator of claim 2, wherein: the first main-gear driven gear and the second main-gear driven gear are duplicate gears.

4. The speed change mechanism of the micro-cultivator of claim 2 or 3, wherein: and the reverse gear shaft is provided with an intermediate gear in meshing fit with a large gear or a small gear of the main-transmission duplicate gear and a reverse gear in meshing fit with the second main-transmission driven gear or the first main-transmission driven gear.

5. The speed change mechanism of the micro-cultivator of claim 4, wherein: the speed change driving mechanism comprises a speed change shifting fork shaft, a speed change shifting fork is arranged on the speed change shifting fork shaft in a sliding mode, one end of the speed change shifting fork acts on the main speed change duplicate gear, the other end of the speed change shifting fork is connected with an intermediate L rod, and the other end of the intermediate L rod is connected with a speed change driving handle.

6. The speed change mechanism of the micro-cultivator of claim 4, wherein: the auxiliary shaft is longitudinally arranged and further comprises an output shaft which is vertically arranged, and the upper end of the output shaft is in transmission connection with one end of the auxiliary shaft through a bevel gear.

7. The speed change mechanism of the micro-cultivator of claim 6, wherein: the automatic transmission device is characterized by further comprising an operation shaft, wherein the operation shaft is transversely arranged, and the middle of the operation shaft is in transmission connection with the tail of the output shaft through a pair of bevel gears.

8. The speed change mechanism of the micro-cultivator of claim 1, 2, 3, 5, 6 or 7, wherein: the transmission main shaft is longitudinally arranged, the engine is arranged at the front end of the transmission main shaft, the starting motor is arranged at the rear end of the transmission main shaft, the starting motor is in transmission connection with the transmission main shaft through a pair of reduction gears, and the engine is in transmission connection with the transmission main shaft through a clutch.

9. The speed change mechanism of the micro-cultivator of claim 4, wherein: the transmission main shaft is longitudinally arranged, the engine is arranged at the front end of the transmission main shaft, the starting motor is arranged at the rear end of the transmission main shaft, the starting motor is in transmission connection with the transmission main shaft through a pair of reduction gears, and the engine is in transmission connection with the transmission main shaft through a clutch.

10. The speed change mechanism of the micro-cultivator of claim 8, wherein: the clutch comprises a shell connected with an output shaft of the engine, a friction plate assembly connected with one end of the transmission main shaft and positioned in the shell, and a pressure plate axially acting on the friction plate assembly; still include right pressure disk driven starts actuating mechanism, it includes the start shifting fork axle and installs start shifting fork on the shifting fork axle to start actuating mechanism, start the shifting fork and act on the terminal surface of pressure disk, the one end of starting the shifting fork axle is connected with the start handle.

11. The speed change mechanism of the micro-cultivator of claim 9, wherein: the clutch comprises a shell connected with an output shaft of the engine, a friction plate assembly connected with one end of the transmission main shaft and positioned in the shell, and a pressure plate axially acting on the friction plate assembly; the automatic pressing plate opening and closing device is characterized by further comprising a starting driving mechanism driven by the pressing plate, wherein the starting driving mechanism comprises a starting shifting fork shaft and a starting shifting fork arranged on the starting shifting fork shaft, the starting shifting fork acts on the end face of the pressing plate, and one end of the starting shifting fork shaft is connected with a starting handle.

12. A micro-cultivator is characterized in that: comprising a gear change mechanism according to any of the preceding claims.

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