Starting mechanism of auxiliary starter, auxiliary starter and agricultural machine

Abstract

The invention relates to the field of agricultural machinery, in particular to a starting mechanism of an auxiliary starter, the auxiliary starter and the agricultural machinery, the starting mechanism comprises a coil spring shaft, a coil spring, a ratchet wheel and a starting mechanism body, the starting mechanism body comprises an upper threaded sleeve, a first elastic piece, a limiting piece, a limiting column and a limiting part, and the upper threaded sleeve is connected with the ratchet wheel through a gear pair. When the crank assembly is rotated downwards, the upper threaded sleeve is connected with the ratchet wheel through the gear pair to drive the ratchet wheel to rotate to achieve coil spring energy storage. When the crank assembly is rotated upwards, the upper force tooth sleeve is separated from the ratchet wheel through the gear pair. According to the scheme, foot starting can be effectively achieved, the starting mode is simple, convenient and labor-saving, and the starting mechanism is simple in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural machinery, in particular to an auxiliary starter, a starting mechanism and agricultural machinery. BACKGROUND

[0002] China is a large agricultural country, with the development of society and economy, agricultural machinery is widely used in China. The existing agricultural machinery needs to be started by an auxiliary starter when starting. The existing auxiliary starter is divided into a hand-rotating auxiliary starter and a pull plate auxiliary starter according to different starting modes. The above two auxiliary starters need to be started by an operator with hands. Especially the hand-rotating auxiliary starter needs to be started by a coil spring energy storage to drive the main shaft to reverse to start the engine. Compared with the pull plate auxiliary starter, the hand-rotating auxiliary starter is more stable when starting the engine because the coil spring energy storage is added.

[0003] For example, Chinese patent CN201711325066.8 discloses a starting mechanism of a new type of air-cooled diesel engine starter. An operator rotates a starting shaft by a crank handle, causes a coil spring to contract to realize elastic energy storage, releases a starting piece, i.e., a pawl, from a ratchet wheel, releases the elastic potential energy of the coil spring, drives the main shaft to reverse to start the engine through the cooperation of a starting cup.

[0004] In actual use environment, because there are many landforms in China, small agricultural machinery is used in mountainous areas, the machine body is low, and the installation position of the auxiliary starter is low. Therefore, the operator needs to bend down to operate when starting. Moreover, most of the people who work in the fields are old people, and it is not convenient to rotate the crank handle. Long-time bending puts a greater burden on the body of the old people. In addition, according to general use habits, the crank handle needs to be rotated in a complete and continuous circular motion during the rotation of the hand-rotating auxiliary starter. It is more laborious to rotate the lower half of the crank handle than the upper half. Moreover, because the hand-rotating is used to contract the coil spring, the greater the contraction distance, the greater the resistance of the coil spring. Therefore, the operator needs to use more arm strength. Therefore, the existing technology has the problems of inconvenient operation and large arm strength requirement. SUMMARY

[0005] In view of the above problems, the present application aims to provide an auxiliary starter, a starting mechanism and agricultural machinery to solve the problems of inconvenient operation and large arm strength requirement in the prior art.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a starting mechanism of an auxiliary starter, comprising a coil spring shaft, a coil spring and a ratchet wheel are arranged on the coil spring shaft, and the ratchet wheel is fixedly connected to the coil spring shaft; further comprising a pawl, the pawl is used to cooperate with the ratchet wheel to limit the reverse rotation of the ratchet wheel during the energy storage process of the coil spring; The starting mechanism further comprises an upper tension assembly, the upper tension assembly comprising an upper tension shaft, a crank handle assembly, an upper tension sleeve, the upper tension shaft being coaxially arranged with the coil spring shaft, the upper tension sleeve being slidably sleeved on the upper tension shaft and located at one end close to the ratchet wheel, the contact part of the upper tension sleeve and the ratchet wheel being provided with a gear pair, so that the upper tension sleeve can drive the ratchet wheel to rotate, the upper tension shaft being provided with a first elastic member, the active end of the first elastic member abutting against the upper tension sleeve, and the side surface of the upper tension sleeve being provided with a limiting column; The starting mechanism further comprises a limiting member, under the cooperation of the limiting member, the limiting column and the first elastic member, when the crank handle assembly is rotated downward, the upper tension sleeve is connected with the ratchet wheel through the gear pair to drive the ratchet wheel to rotate and realize the energy storage of the coil spring; when the crank handle assembly is rotated upward, the upper tension sleeve is disconnected from the ratchet wheel.

[0007] Further, the gear pair comprises a circular ring type tooth group arranged on the side surface of the ratchet wheel and a circular ring type tooth group arranged on the end surface of the upper tension sleeve.

[0008] Further, the limiting member is fixedly arranged on the auxiliary starter housing.

[0009] Further, the limiting member comprises a limiting part, the linear distance between one end of the limiting part and the ratchet wheel being greater than the linear distance between the other end of the limiting part and the ratchet wheel.

[0010] Further, The absolute value of the difference between the linear distance from one end of the limiting part to the ratchet wheel and the linear distance from the other end of the limiting part to the ratchet wheel is greater than the depth of the gear pair tooth groove.

[0011] Further, the end of the limiting part away from the ratchet wheel is provided with a positioning part, the positioning part cooperating with the limiting column to constrain the reset position of the crank handle assembly.

[0012] Further, The positioning part is L-shaped.

[0013] Further, Further comprising a second elastic member, the second elastic member being used for resetting the crank handle assembly.

[0014] Further provided is an auxiliary starter comprising the starting mechanism of any one of the foregoing auxiliary starters.

[0015] Further provided is an agricultural machine comprising the starting mechanism of any one of the foregoing auxiliary starters or the auxiliary starter.

[0016] In summary, the technical scheme of the present application has the following beneficial effects compared with the conventional technical means: 1. The existing hand-held auxiliary starter starting mechanism, under the limitation of the ratchet and pawl, needs to continuously rotate the crank handle assembly to realize spring winding and energy storage, which requires a certain arm strength for the elderly. The scheme of the present application cooperates the limiting piece, the limiting column and the first elastic piece to realize meshing transmission and separation of the ratchet and the upper tooth sleeve through the gear pair when the crank handle assembly is rotated in different directions. Specifically, when winding the spring, the crank handle assembly is rotated, and the upper tooth sleeve is axially moved to the direction of the ratchet under the action of the first elastic piece through the cooperation of the limiting piece and the limiting column, so that the upper tooth sleeve and the gear pair of the ratchet are meshed, the ratchet is driven to rotate, the ratchet drives the spring shaft to rotate, the spring winding is realized, and a stroke of energy storage is completed. In this stroke, the rotation angles of the crank handle assembly, the upper tooth shaft and the upper tooth sleeve are the same, generally within about 90 degrees. At this time, the crank handle assembly is retracted to reset, and in the retraction process, the ratchet will not rotate under the limitation of the pawl, the spring energy storage state remains unchanged, and the upper tooth sleeve is separated from the gear pair of the ratchet under the cooperation of the limiting piece and the limiting column. Repeat the above spring winding action to make the spring reach a sufficient contraction state. By releasing the spring elastic potential energy, the effect of stabilizing the starting of the engine is achieved. In the energy storage process, the crank handle assembly does not need to continuously rotate in a circle, and the traditional hand-shaking mode can be replaced by the foot-treading mode to realize the stage energy storage of the spring. After the energy storage is completed, the switch on the handle or the starting part on the shell is directly actuated by the foot to release the spring potential energy and realize the foot starting. The operator stands to operate without bending over. In addition, the foot-treading mode is more labor-saving than the hand-shaking mode in terms of mechanics, and is convenient for the elderly to operate. Moreover, during the foot starting process, the hand can also hold the handrail of the agricultural machinery, which improves the stability of the agricultural machinery during the starting process.

[0017] 2. Since the overall size of the traditional auxiliary starter is small, generally about 20cm*15cm, the structure of the starting mechanism requires more simplification. In the scheme of the present application, the spring shaft and the upper tooth shaft are coaxially arranged, and the upper tooth sleeve and the ratchet are directly connected through the gear pair to realize transmission and separation, which simplifies the structure and controls the overall size of the product.

[0018] 3. Under the basic requirement of mechanism simplification, the present application adopts the cooperation of the protruding circular ring type teeth group on the side surface of the ratchet and the protruding circular ring type teeth group on the end surface of the upper tooth sleeve to realize the shaft coupling structure, which is more simplified than the traditional shaft coupling.

[0019] 4. The second elastic piece is arranged to realize the automatic reset of the crank handle assembly and the separation of the gear pair of the ratchet and the upper tooth sleeve. After the operator operates the crank handle assembly to complete a stroke of energy storage, the second stroke of energy storage is realized after the operator lifts the foot, and the operation process is simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0020] The foregoing and other objects, features and advantages of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings.

[0021] Figure 1 The overall intention of the present application is to start the mechanism; Figure 2 The exploded view of the present application is shown in the figure; Figure 3 The partial sectional view of the upper tension assembly assembly of the present application is shown in the figure; Figure 4 The first schematic diagram of the upper tension assembly and the ratchet wheel cooperation of the present application is shown in the figure; Figure 5 The second schematic diagram of the upper tension assembly and the ratchet wheel cooperation of the present application is shown in the figure; Figure 6 The third schematic diagram of the upper tension assembly and the ratchet wheel cooperation of the present application is shown in the figure; The reference signs are as follows: coil spring shaft 100, coil spring 200, ratchet wheel 300, pawl 400, upper tension assembly 500, upper tension shaft 510, crank handle assembly 520, upper tension sleeve 530, limiting column 531, First elastic member 540, gear pair 550, circular ring type tooth set 551, spring seat 560, sleeve retainer 570, limiting member 600, limiting portion 610, positioning portion 620, bearing 700. DETAILED DESCRIPTION

[0022] The following embodiments of the present application are described below, and those skilled in the art can make various changes and modifications without departing from the technical concept of the present application. The protection scope of the present application is not limited to the contents of the claims and the description.

[0023] The present application is further described with reference to the following drawings: As Figures 1 to 6 shown, a starting mechanism of an auxiliary starter includes a coil spring shaft 100, a coil spring 200 and a ratchet wheel 300 are arranged on the coil spring shaft 100, the coil spring 200 is not fully shown in the figure, only the part connected with the coil spring shaft 100 is shown. The ratchet wheel 300 is fixedly connected to the coil spring shaft 100; further including a pawl 400, the pawl 400 is used to cooperate with the ratchet wheel 300 to limit the ratchet wheel 300 from reversing during the energy storage process of the coil spring 200; the ratchet wheel 300 and the pawl 400 cooperate to prevent the ratchet wheel 300 from reversing during the energy storage process. The prior art has been fully described, and how to start the engine after the coil spring 200 is energized is also fully described in the prior art, so this application will not be described again.

[0024] The starting mechanism further comprises a tensioning assembly 500, which comprises a tensioning shaft 510, a handle assembly 520, and a tensioning sleeve 530. The tensioning shaft 510 is coaxially arranged with the spring winding shaft 100, i.e., the axes of the tensioning shaft 510 and the spring winding shaft 100 are on the same straight line. The tensioning sleeve 530 is slidingly sleeved on the tensioning shaft 510 and located at one end close to the ratchet wheel 300. Specifically, the tensioning sleeve 530 is axially slidingly sleeved on the tensioning shaft 510 through key groove cooperation, and the rotation of the tensioning sleeve 530 relative to the tensioning shaft 510 is limited, while the tensioning shaft 510 can drive the tensioning sleeve 530 to rotate. The contact part of the tensioning sleeve 530 with the ratchet wheel 300 is provided with a gear pair 550, so that the tensioning sleeve 530 can drive the ratchet wheel 300 to rotate. The tensioning shaft 510 is provided with a first elastic member 540, the active end of the first elastic member 540 abuts against the tensioning sleeve 530, and the first elastic member 540 can drive the tensioning sleeve 530 to move on the tensioning shaft 510 in the axial direction. The side surface of the tensioning sleeve 530 is provided with a limiting column 531, specifically, the side surface refers to the circumferential surface of the tensioning sleeve 530; The installation of the first elastic member 540 can be provided with a mounting groove on the tensioning shaft 510, or a stop block is provided to achieve the same, which will not be described here. The purpose is that one end of the first elastic member 540 is fixed, and the other end is an active end, so that the tensioning sleeve 530 can slide on the tensioning shaft 510.

[0025] For the installation of the first elastic member 540, the application further provides a specific implementation, i.e., the tensioning shaft 510 is arranged in the auxiliary starter housing. A bearing 700 is sleeved on the tensioning shaft 510 close to the handle assembly 520, and the bearing 700 is connected with the housing. The tensioning shaft 510 is connected with the housing through the bearing 700, and the tensioning shaft 510 can rotate freely. A spring seat 560 is further provided, one end of the spring seat 560 abuts against the bearing 700, the end of the first elastic member 540 abuts against the spring seat 560 to achieve fixation, and the other end of the first elastic member 540 abuts against the tensioning sleeve 530.

[0026] In order to limit the farthest distance of the tensioning sleeve 530 sliding towards the ratchet wheel 300, a sleeve stop ring 570 is further arranged on the contact surface between the tensioning sleeve 530 and the tensioning shaft 510.

[0027] The starting mechanism further comprises a limiting member 600. Under the cooperation of the limiting member 600, the limiting column 531, and the first elastic member 540, when the handle assembly 520 is rotated downward, the tensioning sleeve 530 is connected with the ratchet wheel 300 through the gear pair 550 to drive the ratchet wheel 300 to rotate and achieve energy storage of the spring winding 200; when the handle assembly 520 is rotated upward, the tensioning sleeve 530 is disconnected from the ratchet wheel 300 through the gear pair 550.

[0028] The gear pair 550 includes a circular ring type tooth group 551 arranged on the side of the protruding ratchet wheel 300 and a circular ring type tooth group 551 arranged on the end face of the protruding upper tension sleeve 530. The two circular ring type tooth groups 551 are in axial engagement, that is, the upper tension sleeve 530 is connected with the ratchet wheel 300, thereby indirectly realizing the connection between the spring winding shaft 100 and the upper tension shaft 510. Compared with the traditional shaft coupling, that is, the transmission structure of multiple gear pairs 550, the structure of the embodiment is simpler. Moreover, the traditional shaft coupling is generally in radial direction engagement. When realizing the separation of the upper tension shaft 510 and the spring winding shaft 100, there are certain technical problems, such as how to effectively separate the upper tension shaft 510 and the spring winding shaft 100, how to make the influence of the upper tension shaft 510 on the spring force of the spring 200 smaller when the upper tension shaft 510 reverses, and how to facilitate the separation of the upper tension shaft 510 and the spring winding shaft 100 through a specific structure. Therefore, the embodiment of the application not only has a simple structure, but also has the same engagement direction and disengagement direction of the gear pair 550, that is, the axial direction, so that the separation of the upper tension shaft 510 and the spring winding shaft 100 is smoother. When the upper tension shaft 510 is separated from the spring winding shaft, the ratchet wheel 300 is limited by the pawl 400, and the influence on the spring force of the spring 200 is almost negligible.

[0029] Specifically, the limiting part 610 is the contact surface of the limiting part 610 and the limiting column, one end (distal end) of the limiting part 610 is farther away from the ratchet wheel 300 than the other end (proximal end), the straight line distance should be understood as the vertical distance from the side of the ratchet wheel 300. When the limiting part 610 slides on the limiting part 610, it slides from the distal end to the proximal end, and the upper tension sleeve 530 and the ratchet wheel 300 realize the engagement process; from the proximal end to the distal end, the upper tension sleeve 530 and the ratchet wheel 300 realize the disengagement process.

[0030] In order to further effectively realize the separation, the absolute value of the difference between the straight line distance from one end of the limiting part 610 to the ratchet wheel 300 and the straight line distance from the other end to the ratchet wheel 300 is greater than the depth of the gear pair 550 tooth groove. That is, the axial distance between the proximal end and the distal end is greater than the depth of the gear pair 550 tooth groove. The axial movement stroke of the upper tension sleeve 530 is greater than the depth of the tooth groove.

[0031] The return of the crank handle assembly 520 can be achieved by lifting the crank handle assembly 520 with the back of the operator's foot during use, so that it returns. In addition, the second elastic member can also be provided to automatically return the crank handle assembly 520. The return of the crank handle assembly 520, that is, the reverse rotation of the crank handle assembly 520, drives the reverse rotation of the upper tension shaft 510. During the reverse rotation of the upper tension shaft 510, the reverse rotation of the upper tension sleeve 530 is realized. When the upper tension sleeve 530 reverses, the positioning column on the upper tension shaft 510 slides on the limiting part 610, thereby realizing the disengagement of the upper tension sleeve 530 and the ratchet wheel 300.

[0032] In order to further position the reset position end point of the handle assembly 520, the limiting part 610 is provided with a positioning part 620 at the end away from the ratchet wheel 300, the positioning part 620 cooperates with the limiting column 531 to constrain the reset position of the handle assembly 520, and the positioning part 620 is L-shaped.

[0033] The pawl 400 and the limiting part 600 are fixedly arranged on the auxiliary starter housing. The housing here is a broad concept, and the purpose is only to fix the pawl 400 and the limiting part 600, and is not specifically limited to the installation position and the relationship between the inside and outside of the housing.

[0034] The application provides an auxiliary starter, which comprises the starting mechanism of the auxiliary starter according to any one of the preceding.

[0035] The application also provides an agricultural machine, which comprises the starting mechanism of the auxiliary starter or the auxiliary starter according to any one of the preceding.

[0036] In the description of the present application, It should be noted that similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product is used, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical" and the like do not mean that the parts must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should also be noted that unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details and do not limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the contents of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application.

Claims

1. An auxiliary starter's starting mechanism, comprising a coil spring shaft (100) provided with a coil spring (200) and a ratchet wheel (300) fixedly connected to the coil spring shaft (100), and further comprising a pawl (400) for cooperating with the ratchet wheel (300) to limit the ratchet wheel (300) from reversing during the coil spring (200) energy storage process, characterized in that: the starting mechanism further comprises an upper tensioning assembly (500) comprising an upper tensioning shaft (510) coaxially arranged with the coil spring shaft (100), a crank handle assembly (520), and an upper tensioning sleeve (530) slidably sleeved on the upper tensioning shaft (510) and located at one end close to the ratchet wheel (300), wherein the contact part of the upper tensioning sleeve (530) with the ratchet wheel (300) is provided with a gear pair (550) to enable the upper tensioning sleeve (530) to drive the ratchet wheel (300) to rotate, the upper tensioning shaft (510) is provided with a first elastic member (540) with its movable end abutting against the upper tensioning sleeve (530), and the side surface of the upper tensioning sleeve (530) is provided with a limiting column (531). The starting mechanism further comprises a limiting member (600) which, in cooperation with the limiting column (531) and the first elastic member (540), enables the upper tensioning sleeve (530) to drive the ratchet wheel (300) to rotate to realize the coil spring (200) energy storage when the crank handle assembly (520) is rotated downward, and enables the upper tensioning sleeve (530) to disengage from the ratchet wheel (300) when the crank handle assembly (520) is rotated upward. The gear pair (550) comprises a circular ring type tooth set (551) protruding from the side surface of the ratchet wheel (300) and a circular ring type tooth set (551) protruding from the end surface of the upper tensioning sleeve (530).

2. A starting mechanism for an auxiliary starter as defined in claim 1, characterized in that: The limiting member (600) is fixedly arranged on the auxiliary starter housing.

3. A starting mechanism for an assist starter as defined in claim 1, characterized in that: The limiting member (600) comprises a limiting part (610) with one end having a greater linear distance from the ratchet wheel (300) than the other end.

4. A starting mechanism for an assist starter as defined in claim 1, characterized in that: The absolute value of the difference between the linear distance from one end of the limiting part (610) to the ratchet wheel (300) and the linear distance from the other end of the limiting part (610) to the ratchet wheel (300) is greater than the depth of the gear pair (550) tooth groove.

5. A starting mechanism for an auxiliary starter as defined in claim 4, characterized in that: The end of the limiting part (610) away from the ratchet wheel (300) is provided with a positioning part (620) which cooperates with the limiting column (531) to constrain the reset position of the crank handle assembly (520).

6. A starting mechanism for an auxiliary starter as defined in claim 5, characterized in that: The positioning part (620) is L-shaped.

7. A starting mechanism for an auxiliary starter as defined in claim 6, wherein: Further comprising a second elastic member for resetting the crank handle assembly (520).

8. A starting mechanism for an assist starter as defined in claim 1, wherein: The starting mechanism according to any one of claims 1 to 8.

9. An assist starter characterized by The auxiliary starter according to claim 9.

10. An agricultural machine characterized by ​

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