Belt transmission mechanism for mini-tiller and mini-tiller

Abstract

The utility model provides a belt transmission mechanism for a mini-tiller and the mini-tiller, and the belt transmission mechanism comprises a driving wheel, a driven wheel, a first belt and a second belt which are loosely matched at the inner and outer sides of the driving wheel and the driven wheel and have different transmission ratios, and two tensioning mechanisms arranged between the driving wheel and the driven wheel, each tensioning mechanism comprises a rotating cylinder, a rocker arm, a first tensioning wheel, a second tensioning wheel and a driving part connected with the rocker arm, the rotating cylinder is rotationally arranged on the gearbox body, the rotating cylinder is arranged at one end of the rocker arm, and the first tensioning wheel acting on the first belt or the second belt is arranged at the other end of the rocker arm; the second tensioning wheel is rotationally arranged on the gearbox body and located on the side, away from the first tensioning wheel, of the first belt or the second belt. Different transmission ratios are transmitted to the gearbox through the two tensioning mechanisms, and each tensioning mechanism is provided with two tensioning wheels, so that large tensioning force is obtained with a small adjusting stroke, the space occupied by the belt transmission mechanism is reduced, and the transmission mechanism with a compact structure is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of micro-tillage machines, in particular to a belt transmission mechanism for micro-tillage machines and the micro-tillage machine. Background Art

[0002] A micro-tillage machine is a small-sized tillage machine with the characteristics of light weight, small size, simple structure, etc. It is easy to use and store, so it is widely used in farmlands and orchards in mountainous and hilly areas. Micro-tillage machines usually use a small diesel engine or gasoline engine as power, transmit power to the tillage blade through a transmission device, and move forward in the field by manual pushing or trailer pulling, thereby completing the cultivation of the land.

[0003] If the current micro-tillage machines want to achieve high and low multi-speed functions, they mostly use multiple sets of gears in the built-in gearbox to transmit power through belt drive or direct drive. Specifically, when the belt transmits power, an external clutch tensioning mechanism is used to set a tensioning wheel and a clutch cable, and the clutch cable is controlled to achieve "tensioning" or "separation" of the tensioning mechanism, ultimately reflecting the transmission or cutting of power. When transmitting power through direct drive, a "clutch device" is installed in the built-in gearbox, a clutch assembly and a clutch cable are set, and the clutch cable is controlled to achieve "tensioning" or "separation" of the tensioning mechanism.

[0004] The Chinese utility model patent with application number CN202120739659.4 discloses an external high-low multi-speed transmission mechanism of a micro-tiller, which includes a driving pulley and a driven pulley, and a belt tensioning mechanism is provided between the driving pulley and the driven pulley, characterized in that two first belts and second belts with different transmission ratios are wound on the driving pulley and the driven pulley at intervals, and are located on the inner and outer sides of the driving pulley and the driven pulley; the belt tensioning mechanism includes an inner tensioning wheel corresponding to the first belt and an outer tensioning wheel corresponding to the second belt, the inner tensioning wheel and the outer tensioning wheel are respectively located under the first belt and the second belt, and the inner tensioning wheel and the outer tensioning wheel are respectively controlled by a tensioning wheel bracket to approach or move away from the first belt or the second belt.

[0005] However, the first belt and the second belt are both tensioned by a single tensioning wheel, and since the center distance between the driving wheel and the driven wheel in the transmission mechanism is long and the transmission belt is long, the travel required by the tensioning wheel during tensioning is also long. Therefore, a large space needs to be reserved in the whole machine, making the structure of the whole transmission machine not compact enough, and also making the tensioning structure of the single tensioning wheel more troublesome to adjust. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a belt transmission mechanism for a micro-tillage machine to solve the technical problem that in the related art, the first belt and the second belt in the transmission mechanism of the micro-tillage machine are both tensioned by a single tensioning wheel, and since the center distance between the driving wheel and the driven wheel in the transmission mechanism is long and the transmission belt is long, the travel required by the tensioning wheel during tensioning is also long. Therefore, a large space needs to be reserved in the whole machine, making the structure of the overall transmission machine not compact enough, and also making the tensioning structure of the single tensioning wheel more troublesome to adjust.

[0007] The utility model provides a belt transmission mechanism for a micro-tiller, comprising a driving wheel, a driven wheel, a first belt and a second belt which are loosely fitted in parallel on the inner and outer sides of the driving wheel and the driven wheel and have different transmission ratios, and two tensioning mechanisms arranged between the driving wheel and the driven wheel for respectively tensioning or separating the first belt or the second belt, each of the tensioning mechanisms comprising a rotary drum, a rocker arm, a first tensioning wheel, a second tensioning wheel and a driving member, the rotary drum being rotatably arranged on a case body of a gearbox, a rotary drum being arranged at one end of the rocker arm, and a first tensioning wheel for acting on the first belt or the second belt being arranged at the other end, the second tensioning wheel being rotatably arranged on the case body of the gearbox and located on the side of the first belt or the second belt away from the first tensioning wheel, and the driving member being connected to the rocker arm for driving the rocker arm to rotate.

[0008] Furthermore, the driving member includes a cable and a tension spring, one end of the tension spring is connected to the rocker arm, and the other end is connected to the cable.

[0009] Furthermore, the cables of the two tensioning devices are both arranged on the same clutch wire seat through a connecting pin at one end away from the respective tension springs.

[0010] Furthermore, the rotating cylinders provided on the rocker arms of the two tensioning mechanisms are rotatably connected in series on the same rotating shaft, and the rotating shaft is arranged on the housing of the gearbox. The driving member can adjust the rotation angle of the rotating cylinder relative to the rotating shaft through the rocker arm, thereby driving the first tensioning wheel to move up or down to tension or separate the first belt or the second belt.

[0011] Furthermore, the rotating cylinders arranged on the rocker arms of the two tensioning mechanisms are both sleeved with torsion springs.

[0012] Furthermore, the belt transmission mechanism for the micro-tiller also includes a limiting member for limiting the first belt and the second belt, and the limiting member includes a first pressing block close to the driving wheel and pressed against the first belt and a second pressing block close to the driven wheel and pressed against the second belt.

[0013] Furthermore, the limiting member also includes a first pressing shaft close to the driving wheel and pressed against the first belt, and a second pressing shaft close to the driving wheel and pressed against the second belt.

[0014] Furthermore, the limiting member also includes a pressure cylinder close to the driven wheel and pressing against the first belt and the second belt. The pressure cylinder is arranged at one end of the rotating shaft away from the gearbox housing through a bracket.

[0015] The utility model also provides a micro-tillage machine, and the micro-tillage machine comprises the above-mentioned belt transmission mechanism for the micro-tillage machine.

[0016] Furthermore, the micro-tillage machine also includes an internal combustion engine, a gearbox, an armrest and a shelf arranged on the wheeled frame. The internal combustion engine is transmission-connected to the gearbox through a belt drive mechanism for the micro-tillage machine. The shelf is arranged opposite to the armrest and is located above the internal combustion engine.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The belt transmission mechanism for a micro-tillage machine of the utility model realizes different transmission ratios to be transmitted to a gearbox through two tensioning mechanisms, and each tensioning mechanism has two tensioning wheels, thereby achieving a larger tensioning force with a smaller adjustment stroke, reducing the space occupied by the belt transmission mechanism, and forming a transmission mechanism with a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a belt transmission mechanism for a micro-tillage machine according to an embodiment of the utility model;

[0020] Figure 2 This is a rear view of a belt transmission mechanism for a micro-tillage machine according to an embodiment of the utility model, without showing the driving member;

[0021] Figure 3 This is a bottom view of a belt transmission mechanism for a micro-tillage machine according to an embodiment of the utility model, without showing the driving member;

[0022] Description of Figure Numbers:

[0023] 110, driving wheel; 210, driven wheel; 310, first belt; 410, second belt;

[0024] 510, rotary drum; 520, rocker arm; 530, first tensioning wheel; 540, second tensioning wheel; 550, rotating shaft;

[0025] 561, cable; 562, tension spring; 563, clutch seat;

[0026] 571, first pressing block; 572, second pressing block; 573, first pressing shaft; 574, second pressing shaft; 575, pressing cylinder.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and beneficial effects of the utility model more clear, the technical solution of the utility model is further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the utility model, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions that the utility model can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effect that the utility model can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0030] like Figure 1-3As shown, an embodiment of the utility model provides a belt transmission mechanism for a micro-tiller, including a driving wheel 110, a driven wheel 210, a first belt 310 and a second belt 410 which are loosely fitted in parallel on the inner and outer sides of the driving wheel 110 and the driven wheel 210 and have different transmission ratios, and two tensioning mechanisms arranged between the driving wheel 110 and the driven wheel 210 for respectively tensioning or separating the first belt 310 or the second belt 410. Specifically, two annular grooves for assembling the first belt 310 and the second belt 410 are arranged on the driving wheel 110 and the driven wheel 210; each of the tensioning mechanisms includes a rotary drum 510, a rocker arm 520, a first tensioning wheel 530, a second tensioning wheel 540 and a driving member, the rotary drum 510 is rotatably arranged on a box body of a gearbox, one end of the rocker arm 520 is provided with the rotary drum 510, and the other end is provided with a rotary drum 510 for acting on the first belt 310 or the first tensioning wheel 530 on the second belt 410, the second tensioning wheel 540 is rotatably arranged on the gearbox housing and is located on the side of the first belt 310 or the second belt 410 away from the first tensioning wheel 530, the driving member is connected to the rocker arm 520, and is used to drive the rocker arm 520 to rotate, wherein the first tensioning wheel 530 and the second tensioning wheel 540 are both grooved wheels with inner grooves, and the two first tensioning wheels 530 and the two second tensioning wheels 540 of the two tensioning mechanisms are respectively arranged alternately; through the inner grooves on the surfaces of the first tensioning wheels 530 and the second tensioning wheels 540 and the annular grooves of the driving wheel 110 and the driven wheel 210, the inner and outer sides of the first belt 310 and the second belt 410 are restricted, so that it can be more safely ensured that they will not jump off or fall off the pulleys, thereby ensuring the safe operation of the belt transmission system and improving the operating efficiency of the belt transmission system.

[0031] In the embodiment of the utility model, different transmission ratios are transmitted to the gearbox through two tensioning mechanisms, and each tensioning mechanism has two tensioning wheels, thereby achieving a larger tensioning force with a smaller adjustment stroke, reducing the space occupied by the belt drive mechanism, and forming a compact transmission mechanism.

[0032] like Figure 1-3As shown, the driving member includes a cable 561 and a tension spring 562, one end of the tension spring 562 is connected to the rocker arm 520, and the other end is connected to the cable 561, wherein the rocker arm 520 is provided with three fixed point holes at different positions on one end close to the rotating shaft 550, one end of the tension spring 562 is connected to the rocker arm 520 through one of the fixed point holes, and the other end is connected to the control line, and then the installation position is adjusted through the fixed point holes at different positions; by pulling or releasing the cable 561, the cable 561 of a tightening mechanism is operated, so that the rocker arm 520 of the tightening mechanism is pulled, and the first tensioning wheel 530 thereon generates a tensioning force on the first belt 310 or the second belt 410, so as to obtain a certain set of transmission ratios, wherein the cable 561 can be connected to a conventional clutch device in the prior art to facilitate pulling or releasing the cable 561.

[0033] like Figure 1-3 As shown, in the embodiment of the utility model, the cables 561 of the two tensioning devices are respectively arranged on the same clutch wire seat 563 through a connecting pin at one end away from their respective tension springs 562, so that the structure of the tensioning device is more compact and it is also convenient to install the cables 561, wherein the clutch wire seat 563 is arranged on the wheeled frame to make it firm and stable.

[0034] like Figure 1-3 As shown, in an embodiment of the utility model, the rotary drum 510 provided on the rocker arms 520 of the two tensioning mechanisms are rotatably connected in series on the same rotating shaft 550, so as to facilitate more compact installation and operation of the two tensioning mechanisms; the rotating shaft 550 is arranged in the housing of the gearbox. Of course, in another embodiment, the rotating shaft 550 can also be installed on a wheeled frame; the driving member can adjust the rotation angle of the rotary drum 510 relative to the rotating shaft 550 through the rocker arm 520, thereby driving the first tensioning wheel 530 to move up or down, so as to tension or separate the first belt 310 or the second belt 410.

[0035] In one embodiment of the utility model, the rotary cylinder 510 provided on the rocker arms 520 of the two tensioning mechanisms is sleeved with a torsion spring (not shown) to drive the first tensioning wheel 530 on the rocker arms 520 to reset. Specifically, one end of the torsion spring is connected to the rocker arm 520 on the rotary cylinder 510, and the other end can abut against the gearbox housing.

[0036] like Figure 1-3As shown, in the embodiment of the utility model, the belt transmission mechanism for the micro-tillage machine also includes a limiting member for limiting the first belt 310 and the second belt 410, and the limiting member includes a first pressing block 571 close to the driving wheel 110 and pressed against the first belt 310, a second pressing block 572 close to the driven wheel 210 and pressed against the second belt 410, a first pressing shaft 573 close to the driving wheel 110 and pressed against the first belt 310, a second pressing shaft 574 close to the driving wheel 110 and pressed against the second belt 410, and a first pressing shaft 575 close to the driven wheel 210 and pressed against the first belt 310. A pressure cylinder 575 of a belt 310 and a second belt 410, wherein the pressure cylinder 575 is arranged at one end of the rotating shaft 550 away from the gearbox housing through a bracket, and the pressure cylinder 575 is installed on the bracket through bolts and rotates on the bolts, wherein the first pressure block 571, the second pressure block 572 and the first pressure shaft 573 can be installed on the internal combustion engine body through bolts, and the second pressure shaft 574 can be installed on the gearbox housing through bolts for installation and removal. Of course, in other embodiments, the second pressure block 572 can be integrally arranged with the clutch wire seat 563 to reduce space occupation;

[0037] By arranging the first pressure block 571, the second pressure block 572, the first pressure shaft 573, the second pressure shaft 574 and the pressure cylinder 575, the first belt 310 and the second belt 410 which are loosely fitted between the driving wheel 110 and the driven wheel 210 can be ensured to operate reliably without deviation after being tensioned by their respective tensioning mechanisms, thereby making them operate smoothly so as to transmit the power output of the internal combustion engine to the gearbox.

[0038] Example 2

[0039] An embodiment of the utility model provides a micro-tiller, which includes a belt transmission mechanism for a micro-tiller as described in the above-mentioned embodiment 1. The specific structure of the belt transmission mechanism for a micro-tiller refers to the above-mentioned embodiment 1. Since the micro-tiller adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0040] In an embodiment of the utility model, the micro-tillage machine also includes an internal combustion engine, a gearbox, an armrest and a shelf arranged on a wheeled frame. The internal combustion engine is connected to the gearbox through a belt drive mechanism for the micro-tillage machine, so that the gearbox with a single transmission ratio can achieve a multi-speed ratio belt drive output, that is, if the gearbox has only forward gear and reverse gear, a wheel belt device with two sets of different transmission ratios is used to transmit the power of the internal combustion engine to the gearbox through it, so that the gearbox originally has only one gear forward and one gear reverse, which can be converted into a different speed ratio transmission output with two gears forward and two gears reverse; on this basis, the number of belt drive ratios or the number of gear ratios of the gearbox can be increased, so that the micro-tillage machine can obtain more gears to meet the needs of users in different application scenarios; the shelf is arranged opposite to the armrest and is located above the internal combustion engine to avoid touching the internal combustion engine and causing burns, thereby playing a protective role. At the same time, goods can be placed on the shelf to improve its flexibility.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A belt transmission mechanism for a micro-tillage machine, comprising a driving wheel (110), a driven wheel (210), a first belt (310) and a second belt (410) which are loosely fitted in parallel on the inner and outer sides of the driving wheel (110) and the driven wheel (210) and have different transmission ratios, and two tensioning mechanisms arranged between the driving wheel (110) and the driven wheel (210) for respectively tensioning or separating the first belt (310) or the second belt (410), characterized in that: Each of the tensioning mechanisms comprises a rotary drum (510), a rocker arm (520), a first tensioning wheel (530), a second tensioning wheel (540) and a driving member. The rotary drum (510) is rotatably arranged on a housing of a gearbox. The rotary drum (510) is arranged at one end of the rocker arm (520), and the first tensioning wheel (530) for acting on a first belt (310) or a second belt (410) is arranged at the other end. The second tensioning wheel (540) is rotatably arranged on the housing of the gearbox and is located on a side of the first belt (310) or the second belt (410) away from the first tensioning wheel (530). The driving member is connected to the rocker arm (520) and is used to drive the rocker arm (520) to rotate.

2. A belt transmission mechanism for a micro-tillage machine as claimed in claim 1, characterized in that: The driving member comprises a cable (561) and a tension spring (562), one end of the tension spring (562) is connected to the rocker arm (520), and the other end is connected to the cable (561).

3. A belt transmission mechanism for a micro-tillage machine as claimed in claim 2, characterized in that: The cables (561) of the two tensioning mechanisms are both arranged on the same clutch wire seat (563) via a connecting pin at one end away from the respective tension springs (562).

4. A belt transmission mechanism for a micro-tillage machine as claimed in claim 1, characterized in that: The rotating cylinders (510) arranged on the rocker arms (520) of the two tensioning mechanisms are both rotatably connected in series on the same rotating shaft (550), and the rotating shaft (550) is arranged on the housing of the gearbox. The driving member can adjust the rotation angle of the rotating cylinder (510) relative to the rotating shaft (550) through the rocker arms (520), thereby driving the first tensioning wheel (530) to move up or down, so as to tension or separate the first belt (310) or the second belt (410).

5. A belt transmission mechanism for a micro-tillage machine as claimed in claim 4, characterized in that: The rotating cylinders (510) arranged on the rocker arms (520) of the two tensioning mechanisms are both sleeved with torsion springs.

6. A belt transmission mechanism for a micro-tillage machine as claimed in claim 4, characterized in that: The belt transmission mechanism for the micro-tillage machine further comprises a limiting member for limiting the first belt (310) and the second belt (410), wherein the limiting member comprises a first pressing block (571) close to the driving wheel (110) and pressed against the first belt (310) and a second pressing block (572) close to the driven wheel (210) and pressed against the second belt (410).

7. A belt transmission mechanism for a micro-tillage machine as claimed in claim 6, characterized in that: The limiting member further comprises a first pressing shaft (573) close to the driving wheel (110) and pressed against the first belt (310), and a second pressing shaft (574) close to the driving wheel (110) and pressed against the second belt (410).

8. A belt transmission mechanism for a micro-tillage machine as claimed in claim 7, characterized in that: The limiting member also includes a pressure cylinder (575) close to the driven wheel (210) and pressed against the first belt (310) and the second belt (410). The pressure cylinder (575) is arranged at one end of the rotating shaft (550) away from the gearbox housing through a bracket.

9. A micro-tillage machine, characterized in that: The micro-tillage machine includes a belt transmission mechanism for a micro-tillage machine as described in any one of claims 1-8.

10. A micro-tillage machine as claimed in claim 9, characterized in that: The micro-tillage machine also includes an internal combustion engine, a gearbox, an armrest and a shelf arranged on a wheeled frame. The internal combustion engine is transmission-connected to the gearbox through a belt transmission mechanism for the micro-tillage machine. The shelf is arranged opposite to the armrest and is located above the internal combustion engine.

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