CN220037367U

CN220037367U - Double-tensioning-wheel belt transmission mechanism for mini-tiller

Info

Publication number: CN220037367U
Application number: CN202321662201.9U
Authority: CN
Inventors: 方智恒; 李姣姣; 杨洪鱼; 黄瑜
Original assignee: Chongqing Meiqi Industry Co ltd
Current assignee: Chongqing Meiqi Industry Co ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-11-17
Anticipated expiration: 2033-06-28

Abstract

The utility model relates to the technical field of mini-tiller, and discloses a double-tensioning-wheel belt transmission mechanism for a mini-tiller, which comprises the following components: the belt wheel device consists of a driving wheel, a driven wheel, a first belt and a second belt; the tensioning device is arranged in two and used for acting on the first belt and the second belt respectively, the first belt and the second belt are in parallel loose fit between the driving wheel and the driven wheel, and the driving wheel and the driven wheel are provided with two corresponding groups of different transmission ratios. The adjustable two-speed-ratio belt transmission output device can obtain adjustable two-speed-ratio belt transmission output, is simple and feasible in structure, is rapid and convenient to operate, is safe and reliable to work, and has strong practicability.

Description

Double-tensioning-wheel belt transmission mechanism for mini-tiller

Technical Field

The utility model belongs to the technical field of mini-tiller, and provides a double-tensioning-wheel belt transmission mechanism for a mini-tiller.

Background

The mini-tiller is an agricultural garden machine designed for operation in orchards, vegetable fields, greenhouses, hilly lands and small fields, has been widely popularized and applied, but the current mini-tiller power is generally provided by an internal combustion engine or an engine, a power output shaft is arranged on the internal combustion engine or the engine and extends out of the engine, a driving wheel is arranged on the shaft, and in consideration of protection effect and the like, the impact force on the internal combustion engine or the engine can be reduced by adopting belt transmission, and the belt is tensioned and then transmitted to a gearbox to realize the clutch of the power.

However, in the existing mechanical structure, the driving wheel, the driven wheel and the single tensioning wheel with the same transmission ratio are often adopted for power transmission, and the mechanical conversion speed can only be realized by adopting a gearbox, so that the following results are brought: on the one hand, the gearbox is composed of a variable speed transmission mechanism and a variable speed control mechanism, wherein the variable speed transmission mechanism mainly aims at changing the numerical value and the direction of torque and rotating speed, the control mechanism mainly aims at controlling the variable speed transmission mechanism to realize the change of a variable speed transmission ratio, namely, gear shifting is realized, so as to achieve the effect of changing the speed and the moment, namely, the micro-cultivator usually needs to additionally operate the control mechanism to achieve the effect of switching the mechanical speed, and the control mechanism is arranged close to the gearbox, so that an operator can have a certain distance from the control mechanism after holding the armrest frame of the micro-cultivator, and the rapidity of switching the mechanical speed is insufficient. On the other hand, the transmission ratio of the gearbox is limited for the mini-tiller, namely, the adoption of excessive transmission ratio tends to increase the whole structure of the gearbox, so that the volume of the gearbox is excessively large, and the manufacturing cost of the mini-tiller is increased; however, if a transmission case with too few transmission ratios, such as a transmission case with only forward gears and reverse gears formed by a single transmission ratio, is capable of being miniaturized, the transmission case is enabled to have no variable speed, and only has the switching of the forward gears and the reverse gears, so that the mini-tiller cannot be well adapted to different working conditions or occasion operations, and the possible running speed and the possible tilling torque can be met.

Disclosure of Invention

In view of the above, the present utility model aims to provide a double-tensioning-wheel belt transmission mechanism for mini-tiller, which aims to solve the problem that the speed of a single-gear-ratio gearbox is not variable enough in speed switching.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a double-tensioning-wheel belt transmission mechanism for a mini-tiller, which comprises the following components: the belt wheel device consists of a driving wheel, a driven wheel, a first belt and a second belt; the tensioning device is arranged in two and used for acting on the first belt and the second belt respectively, the first belt and the second belt are in parallel loose fit between the driving wheel and the driven wheel, and the driving wheel and the driven wheel are provided with two corresponding groups of different transmission ratios.

Optionally, the belt device further comprises: a first pressing block which is close to the driven wheel and presses against the first belt, and a second pressing block which is close to the driving wheel and presses against the second belt.

Alternatively, the single tensioning device is composed of a rocker arm, a rotary cylinder, a control thread, a tension spring and a tensioning wheel, wherein one end of the rocker arm is provided with the rotary cylinder, the other end of the rocker arm is provided with the tensioning wheel used for acting on the first belt or the second belt, one end of the tension spring is connected to the rocker arm, and the other end of the tension spring is connected with the control thread.

Alternatively, the rotary drums arranged on the rocker arms of the two tensioning devices are connected in series with the same rotating shaft in a rotating way.

Optionally, a spacer tube is disposed on the rotating shaft and between the two rotating cylinders.

Optionally, the control cables of the two tensioning devices are respectively arranged on the same release line seat at one ends deviating from the tension springs respectively through a connecting pin.

Optionally, the control cord extends to a clutch handle on the armrest frame of the mini-tiller via an extension cord.

Optionally, the method further comprises: the interlocking device is used for interlocking and controlling the two tensioning devices and consists of a pull rope and a pulley, wherein the pull rope is wound on the pulley, and two ends of the pull rope are respectively connected with rocker arms of the two tensioning devices.

Optionally, the interlocking device further comprises a bracket and a pin shaft, and the pulley is rotated on the bracket through the pin shaft.

The utility model has the technical effects that: the double-tensioning wheel belt transmission mechanism obtains independent belt transmission by designing two groups of wheel belt devices with different transmission ratios and respectively controlling the two tensioning devices, and can easily realize the rapid switching of the two groups of the wheel belt devices with different transmission ratios by two clutch handles arranged on the handrail frame of the mini-tiller, thereby being very convenient to use; the independent belt transmission of the wheel belt devices with two groups of different transmission ratios is achieved by the interlocking device through the independent actions of the two tensioning devices, and the problem of synchronous transmission interference of the wheel belt devices with two groups of different transmission ratios caused by misoperation of two clutch handles when the two clutch handles are simultaneously held and the like is avoided. In general, the double-tensioning-wheel belt transmission mechanism can obtain adjustable two-speed-ratio belt transmission output, is simple and feasible in structure, is rapid and convenient to operate, is safe and reliable to work, and has strong practicability.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of the overall structure of a dual tensioner belt drive of the present utility model;

FIG. 2 is a schematic illustration of a belt assembly in a dual tensioner belt drive of the present utility model;

FIG. 3 is a schematic diagram of a tensioner and interlock arrangement in a dual tensioner belt drive of the present utility model;

FIG. 4 is a schematic illustration of the application of the dual tensioner belt drive of the present utility model to a mini-tiller;

reference numerals: 1-wheel belt device, 2-tensioning device, 3-interlocking device, 4-clutch device, 5-armrest frame, 6-gearbox, 7-internal combustion engine and 8-wheel frame; 11-a driving wheel, 12-a driven wheel, 13-a first pressing block, 14-a first belt, 15-a second belt and 16-a second pressing block; the device comprises a rocker arm 21, a rotary cylinder 22, a spacing tube 23, a rotary shaft 24, a clutch wire seat 25, a connecting pin 26, a control wire 27, a tension spring 28 and a tension pulley 29; 31-bracket, 32-stay cord, 33-pulley, 34-round pin axle.

Detailed Description

The utility model is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1-4, the dual-tensioning wheel belt transmission mechanism for the mini-tiller is mainly used for belt transmission between an internal combustion engine 7 and a gearbox 6 which are arranged on a wheel frame 8 of the mini-tiller, and comprises a wheel belt device 1 and a tensioning device 2; the belt device 1 comprises a driving wheel 11, a driven wheel 12, a first belt 14 and a second belt 15, wherein the driving wheel 11 is arranged on an output shaft of the internal combustion engine 7, the driven wheel 12 is arranged on an input shaft of the gearbox 6, the first belt and the second belt are in parallel loose fit between the driving wheel 11 and the driven wheel 12, and the driving wheel 11 and the driven wheel 12 are provided with two groups of corresponding different transmission ratios; wherein two tensioning devices 2 are arranged for acting on the first belt 14 and the second belt 15 respectively, and the single tensioning device 2 consists of a rocker arm 21, a rotary drum 22, a control cord 27, a tension spring 28 and a tensioning wheel 29, one end of the rocker arm 21 is provided with the rotary drum 22, the other end is provided with the tensioning wheel 29 which can act on the first belt 14 or the second belt 15, one end of the tension spring 28 is connected with the rocker arm 21, the other end is connected with the control cord 27, the other ends of the two control cords 27 are connected with a clutch device 4 which is respectively arranged on two grips of the handrail frame 5, the single clutch device 4 consists of an extension cord and a clutch handle, namely the control cord 27 extends to the clutch handle on the handrail frame 5 of the mini tiller through the extension cord, the clutch device can be used for respectively controlling the control threads 27 of the two tensioning devices 2 by one hand, the clutch handle is used as a clutch switch and is matched with the grip on the handrail frame 5, an operator can pull or loosen the control threads 27 by pinching the clutch handle of the clutch device 4 and the grip of the handrail frame 5 by one palm, and further, the control threads 27 of one tensioning device 2 are operated, so that the rocker arm 21 of the tensioning device 2 is pulled, and the tensioning wheel 29 on the rocker arm 21 generates tensioning force on the first belt 14 or the second belt 15, so that the belt device 1 between the internal combustion engine 7 and the gearbox 6 obtains a certain group of transmission ratios, and the transmission between the three is enabled.

The belt apparatus 1 in the present embodiment further includes: a first pressing block 13 which is arranged on the wheel frame 8 and is close to the driven wheel 12 and is used for pressing against the first belt 14, and a second pressing block 16 which is arranged on the wheel frame 8 and is close to the driving wheel 11 and is used for pressing against the second belt 15, through the design structure of the first pressing block 13 and the second pressing block 16, the first belt 14 and the second belt 15 which are loosely matched between the driving wheel 11 and the driven wheel 12 can ensure that the first belt 14 and the second belt 15 can operate reliably and are not deviated after being tensioned by the respective tensioning device 2, and the running of the wheel belt device 1 is smooth, so that the power output of the internal combustion engine 7 is transmitted to the gearbox 6.

The rotary drums 22 arranged on the rocker arms 21 of the two tensioning devices 2 in the embodiment are connected on the same rotary shaft 24 in series in a rotating way so as to facilitate the installation and the operation of the two tensioning devices 2 in a relatively compact way; the shaft 24 can be provided on the housing of the gearbox 6, but can also be mounted on the wheeled frame 8 in different examples; and a spacer tube 23 is arranged on the rotating shaft 24 and between the two rotating drums 22, so that the two rocker arms 21 have a certain distance, and the two tensioning devices 2 better correspond to the first belt 14 and the second belt 15 respectively. In addition, the control cables 27 of both tensioning devices 2 are each mounted on the same clutch wire holder 25 at the end facing away from the respective tension spring 28 by means of a connecting pin 26, and the clutch wire holders are fixedly mounted on the wheeled vehicle body 8 for uniform mounting.

The dual-tensioning-wheel belt transmission mechanism in the embodiment further comprises an interlocking device 3 for interlocking the two tensioning devices 2, wherein the interlocking device 3 is composed of a bracket 31, a pull rope 32, a pulley 33 and a pin shaft 34, the pulley 33 is rotated on the bracket 31 through the pin shaft 34, the bracket 31 is fixedly arranged on the wheel-type frame 8, the pull rope 32 is wound on the pulley 33, and two ends of the pull rope 32 are respectively connected with the rocker arms 21 of the two tensioning devices 2. Thus, the bracket 31 is fixedly mounted on a mudguard such as the wheeled frame 8, the lower end of the bracket is provided with the pin 34, the pin 34 is rotatably mounted in the bracket 31 with the pulley 33, the pulley 33 is provided with the pull rope 32, both ends of the pull rope 32 are provided with the fixed terminals, and the two fixed terminals are respectively and fixedly mounted at one end of the two rocker arms close to the tensioning wheel. When one of the two tensioning devices 2 is pulled, the pull rope 32 is pulled synchronously, namely, one end of the pull rope 32 moves along with the lifted tensioning device 2, and the other end of the pull rope 2 pulls the other tensioning device to descend, so that only one belt in the belt wheel device 1 is tensioned, and misoperation or invalid operation caused by synchronous pinching of the two clutch handles by an operator is avoided.

Specifically, by installing two sets of belt devices 1 with different transmission ratios between the output shaft of the internal combustion engine 7 and the input shaft of the gearbox 6, namely, two belts (a first belt 14 and a second belt 15) are installed on two sets of belt pulleys (a driving wheel 11 and a driven wheel 12), two tensioning wheels 29 are sequentially installed at corresponding positions of the outer edges of the two belts, the inside of the two tensioning wheels 29 is rotatably installed on the two rocker arms 21 through rolling bearings, one ends of the two rocker arms 21 far away from the tensioning wheels 29 are rotatably installed on the same rotating shaft 24, and the rotating shaft 24 is fixedly installed on the wheel type frame 8. The two rocker arms are provided with fixing point holes with different positions at one end close to the rotating shaft so as to adjust the mounting position, one ends of two tension springs 28 are respectively connected with the two rocker arms 21 through one of the fixing point holes, the other ends of the two tension springs 28 are connected with a control rope 27, a release line seat 25 is fixedly arranged on the wheel type frame 8, a plurality of mounting slots are formed in the position, corresponding to the two tension springs 28, of the release line seat 25, the control rope 27 passes through the corresponding mounting slots and is telescopically arranged on the release line seat 25 through a connecting pin 26, one end, far away from the tension springs 28, of the control rope 27 is connected with a clutch handle through an extension rope of a clutch device 4, the clutch handle is arranged on a handle of a handrail frame 5, the clutch handle of the clutch device 4 is rotatably provided with a rope pulling box through a bolt, the rope pulling box is fixedly arranged on the handrail frame, and the handrail frame 5 is fixedly arranged on the wheel type frame 8.

In the initial state, the two tensioning wheels 29 are stopped on a mud guard of the wheel type frame 8, an operator selectively presses a clutch handle of one clutch device 4, the clutch handle rotates along a bolt relative to the pull rope box, one end of an extension rope of the clutch device 4 is driven by the clutch handle to relatively move along with the clutch handle, the other end of the extension rope is connected with a tension spring 28 through a control rope 27, and one end of the extension rope also moves along with the extension rope, so that the tension spring 28 is lifted upwards, a rocker 21 connected with the tension spring 28 also rotates upwards along with a rotating shaft 24, the tensioning wheel 29 rotatably connected with the rocker 21 moves towards a corresponding belt (such as a first belt 14), and the corresponding belt (such as the first belt 14) is approached and tensioned, so that the belt can be pressed on the working belt pulley with proper pressure, and the belt transmission mechanism starts power transmission; and the clutch handle is released, so that the power transmission is stopped. Meanwhile, when one clutch handle is pressed, the rocker arm 21 of a corresponding certain tensioning device 2 rotates upwards, the pull rope 32 encircling the pulley 33 of the interlocking device 3 also rotates along with the pulley 33 and is lifted upwards, and as the length of the pull rope 32 is fixed, the other end of the pull rope 32 keeps a fixed length and cannot be lifted upwards, so that an operator can ensure that the tensioning wheel 29 of the other tensioning device 2 cannot be lifted upwards and press a corresponding belt (such as the second belt 15) when the other clutch handle is touched by mistake after pressing one clutch handle, the phenomenon that two groups of pulleys with different transmission ratios simultaneously transmit power is avoided, and the operation risk is reduced. If the clutch handles with different transmission ratios are selected to be pressed, the belt pulleys with different transmission ratios can be selected to operate so as to achieve the effect of fast switching speed.

By adopting the scheme, the double-tensioning belt transmission mechanism is characterized in that two groups of belt devices with different transmission ratios are designed and are controlled by the two tensioning devices respectively to obtain independent belt transmission, and the two groups of belt devices with different transmission ratios can be easily and quickly switched by the two clutch handles arranged on the handrail frame of the mini-tiller, so that the double-tensioning belt transmission mechanism is very convenient to use; the independent belt transmission of the wheel belt devices with two groups of different transmission ratios is achieved by the interlocking device through the independent actions of the two tensioning devices, and the problem that the synchronous transmission of the wheel belt devices with two groups of different transmission ratios is interfered or has no transmission effect due to the misoperation of the two clutch handles in the simultaneous holding and other conditions is avoided.

In general, by compacting the belts of two groups of pulleys with different transmission ratios to select different speeds for transmission output, and by installing an interlocking device on the two groups of tensioning devices, the simultaneous transmission of power by the two groups of pulleys with different transmission ratios is avoided, and the operation risk is reduced; the adjustable multi-speed-ratio belt transmission output device has the advantages of simple and feasible structure, rapid and convenient operation, safe and reliable work and strong practicability.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.

Claims

1. A dual tensioner belt drive for a mini-tiller comprising: the belt device (1) consists of a driving wheel (11), a driven wheel (12), a first belt (14) and a second belt (15); the tensioning device (2) is arranged in two and is used for acting on the first belt and the second belt respectively, and is characterized in that the first belt and the second belt are in parallel loose fit between the driving wheel and the driven wheel, and the driving wheel and the driven wheel are provided with two corresponding groups of different transmission ratios.

2. The dual tensioner belt drive for a mini-tiller of claim 1, said belt assembly further comprising: a first press (13) adjacent to the driven wheel and pressing against the first belt, and a second press (16) adjacent to the driving wheel and pressing against the second belt.

3. The double-tensioning-wheel belt transmission mechanism for mini-tiller according to claim 1, characterized in that the single tensioning device is composed of a rocker arm (21), a rotary drum (22), a control cord (27), a tension spring (28) and a tensioning wheel (29), one end of the rocker arm is provided with the rotary drum, the other end of the rocker arm is provided with the tensioning wheel used for acting on the first belt or the second belt, one end of the tension spring is connected to the rocker arm, and the other end of the tension spring is connected with the control cord.

4. A double-tensioning-wheel belt transmission for mini-tiller according to claim 3, characterized in that the rotary drums provided on the rocker arms of both tensioners are each rotatably connected in series with the same rotary shaft (24).

5. The double-tensioning-wheel belt transmission mechanism for mini-tiller according to claim 4, characterized in that a spacer tube (23) is arranged on the rotating shaft and between the two rotating cylinders.

6. A double-tensioning-wheel belt transmission for mini-tiller according to claim 3, characterized in that the control cables of both tensioning devices are arranged on the same release-line seat (25) at the end facing away from the respective tension spring, respectively, by means of a connecting pin (26).

7. The dual tensioner belt drive mechanism for a mini-tiller of claim 6, wherein the control cord extends to a clutch handle on a handle frame of the mini-tiller via an extension cord.

8. The dual tensioner belt transmission for a mini-tiller as in any one of claims 3-7, further comprising: the interlocking device (3) is used for interlocking and controlling the two tensioning devices, and consists of a pull rope (32) and a pulley (33), wherein the pull rope is wound on the pulley, and two ends of the pull rope are respectively connected with rocker arms of the two tensioning devices.

9. The dual tensioner belt transmission mechanism for a mini-tiller of claim 8, wherein the interlock further comprises a bracket (31) and a pin (34) through which the pulley is rotatable on the bracket.