CN215171660U - Torque limiting device and transmission mechanism and agricultural machine using same - Google Patents

Abstract

The utility model discloses a moment of torsion limiting device, moment of torsion limiting device sets up on drive mechanism's power input shaft, moment of torsion limiting device includes a section of thick bamboo, spring plate and transmission shaft, the platform that the transmission shaft front end set up is cup jointed to a section of thick bamboo, it sets up spacing hole to correspond the platform on the section of thick bamboo, spacing downthehole insert for the spacing spring plate of platform. The utility model discloses torque limiting device adopts split type design, and different hardness materials are chooseed for use to the axle sleeve and the spring board, for drive mechanism provides continuous stable torque limitation and do not influence power input intensity, spare part no abnormal shape structure simultaneously, low in production cost recovers rapidly after the spring board takes place to skid and warp, and the dismouting is maintained also labour saving and time saving more.

Description

Torque limiting device and transmission mechanism and agricultural machine using same

Technical Field

The utility model belongs to the technical field of agricultural machine, in particular to moment of torsion limiting device and use its drive mechanism, agricultural machine.

Background

Agricultural machinery (such as a rice transplanter, a seedling thrower and the like) has higher requirements on a transmission mechanism in the operation process. The transmission mechanism is arranged between the PTO shaft of the engine and the working mechanism, receives power from the PTO power output shaft and transmits the power to the working part, and has the function of changing the power transmission direction. Because the working environment of the agricultural machinery is severe, weeds, soil or foreign matters often enter the working mechanism to cause the stagnation of the working mechanism, if power is continuously input from the PTO shaft at the moment, the transmission system is in an overload running state, and damage of parts and even safety accidents are easily caused after overload, so the torque limiting device for overload protection of the transmission mechanism in the agricultural machinery is particularly important.

In prior art, some adoption gear assemblies of drive mechanism carry out overload protection, and its structure mainly includes gear shaft and external gear, still including being fixed in the leaf spring on the external gear inner wall, this leaf spring inner wall is equipped with a plurality of recesses, the gear shaft periphery is equipped with a plurality of convex parts that match spacing with the leaf spring recess: when the torque between the convex part of the gear shaft and the concave part of the plate spring is less than a predetermined force, the convex part of the gear shaft is embedded with the concave part of the plate spring, and the gear shaft drives the external gear to synchronously rotate: when the torque between the convex part of the gear shaft and the concave part of the plate spring is larger than a predetermined force, the plate spring is deformed, the convex part of the external gear and the concave part of the plate spring are staggered, and relative rotation is generated between the gear shaft and the external gear. The prior art mainly has the following problems: (1) the torque-limiting plate spring and the external gear are special in structure, the requirement on machining precision is high, the production difficulty of parts is further increased, and the part cost is high; (2) in the prior art, the plate spring and the gear are of an integral structure, and a single material cannot meet the requirements of elastic strength and rigidity at the same time, so that the power input strength is limited; (3) in the prior art, the overall structure is complex, so that the maintenance and the replacement are time-consuming and labor-consuming; (4) the gear overload protection device is seriously abraded, and the torque limiting effect is unstable.

SUMMERY OF THE UTILITY MODEL

In view of the technical problems of high manufacturing cost, unstable overload protection, limited power and the like to be solved urgently in the prior art, the utility model provides an aspect of a torque limiting device with low production cost, simple overload protection structure and stable performance.

The utility model provides a torque limiting device, torque limiting device sets up on drive mechanism's power input shaft and/or power output shaft, torque limiting device includes a barrel, spring plate and transmission shaft, the platform that the barrel cup jointed the transmission shaft front end and set up, correspond the platform on the barrel and set up spacing hole, insert for the spacing spring plate of platform in the spacing hole.

Furthermore, one end of the shaft cylinder and the power input shaft or the power output shaft are integrated, and the hollow opening in the other end of the shaft cylinder is in a circular tube shape.

Furthermore, the limiting holes are long-strip-shaped holes, penetrate through the wall of the shaft barrel in the direction perpendicular to the axial direction of the power input shaft, and are symmetrically distributed along the central axis of the power input shaft.

Furthermore, the spring plate is a strip-shaped plate, and the sizes of the width direction and the thickness direction of the spring plate are respectively slightly smaller than the length and the width of the limiting hole, so that the spring plate can penetrate into the limiting hole and can slide.

Furthermore, the two platforms are step surfaces, the distance between the two step surfaces is consistent with the distance between the inner sides of the two spring plates after penetrating into the limiting holes, and the two step surfaces of the transmission shaft can be clamped by the two spring plates.

The utility model discloses the second aspect provides an use above-mentioned torque limiting device's drive mechanism, including above-mentioned arbitrary one the torque limiting device.

Furthermore, a first bearing group is further arranged in the transmission mechanism, and a spacer bush is further arranged between the shaft barrel and the first bearing group.

Furthermore, the spacer bush is a circular tubular part, the inner diameter of the spacer bush is slightly larger than the outer diameter of the shaft barrel, and the spacer bush limits the spring plate and prevents the spring plate from being separated.

The utility model discloses the third aspect provides an agricultural machine, including the drive mechanism who uses foretell moment of torsion limiting device. Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses torque limiting device carries out spacing to the transmission shaft through power input shaft and axle sleeve cooperation spring board, split type design, when the moment of torsion is less than the predetermined power, the transmission shaft platform imbeds in the spring board, does not do relative motion, otherwise, when the moment of torsion is greater than the predetermined power, make spring board and transmission shaft take place to skid and produce relative motion, the clearance between the spring board can make the front end platform of transmission shaft rotatory pass through, interrupt the input of power to protect agricultural machine's spare part, simple structure, the overload protection method is effective;

(2) the utility model improves the power input shaft, and the shaft barrel with the limiting hole is matched with the spring plate to limit the transmission shaft platform, so that all components have simple processes and low production and processing cost;

(3) the utility model discloses torque limiting device, spring plate adopt the better steel material of elasticity like 65Mn, 60Si2Mn, 60CrMnA etc. and power input shaft, beam barrel then adopt 45 steel, the better material of 20CrMnTi intensity, have not only ensured power input intensity, and the moment of torsion transfinites when still having ensured to take place to transship and takes place to skid the interrupt transmission and protect, the utility model discloses it is high to endure moment of torsion intensity, and overload protection is stable.

(4) The utility model discloses applied type moment of torsion limiting device's drive mechanism, compact structure is single, and protection overload protection method is simple effective, and drive mechanism maintains conveniently.

Drawings

FIG. 1 is a schematic view of a cross-section structure of a transmission mechanism of a seedling throwing machine according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a torque limiting device at a power input shaft end provided by an embodiment of the present invention;

FIG. 3 is a schematic view of a section of a transmission shaft when the torque provided by the embodiment of the present invention does not exceed a predetermined value;

fig. 4 is a schematic cut-away view of a transmission shaft in a slipping state when a torque exceeds a predetermined value according to an embodiment of the present invention;

the device comprises a torque limiting device-100, a shaft barrel-110, a limiting hole-111, a spring plate-120, a transmission shaft-130, a platform-131, a power input shaft-200, a power output shaft-300, a first bearing group-400, a second bearing group-500, a spacer-600 and a transmission mechanism-700.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the preferred embodiments described, but the scope of the invention is defined by the claims.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In a first specific embodiment, the utility model discloses torque limiting device's seedling throwing machine drive mechanism, it is shown with reference to fig. 1, 2, 3, in the seedling throwing machine drive mechanism 700, torque limiting device sets up on power input shaft 200, and torque limiting device 100 includes barrel 110, spring plate 120 and transmission shaft 130, the platform 131 that the barrel 110 cup joints the front end of transmission shaft 130 and sets up, correspond platform 131 on the barrel 110 and set up spacing hole 111, insert for the spacing spring plate 120 of platform 131 in the spacing hole 111. The front end of transmission shaft 130 sets up two platforms 131, the diameter of beam barrel 110 is slightly greater than transmission shaft 130 platform end diameter, two platforms 131 are the step face, the distance between two step faces is unanimous with the distance that two spring plates 120 penetrate spacing hole 111 back inboard, or the distance between two step faces is slightly bigger than the distance that two spring plates 120 penetrate spacing hole 111 back inboard, make two step faces of transmission shaft 130 can be held by two spring plates 120, thereby follow power input shaft 200 and rotate, drive the operation of follow-up work part, realize the transmission of power.

Further, as shown in fig. 2, specifically, the diameter of the end of the power input shaft 200 is increased, and the shaft tube 110 having a certain depth and a certain wall thickness is provided inside the increased diameter portion. The shaft tube 110 is a part of the power input shaft 200 and is arranged at one end of the power input shaft extending into the transmission mechanism 700, the hollow opening in the shaft tube 110 is in a circular tube shape, and the diameter of the shaft tube 110 is larger than that of the platform 131 end of the transmission shaft 130. The number of the limiting holes 111 on the shaft barrel 110 is four, the limiting holes 111 are long-strip-shaped holes, the limiting holes 111 penetrate through the wall of the shaft barrel 110 in the direction perpendicular to the axial direction of the power input shaft 200, and the two groups of limiting holes 111 are symmetrically distributed along the central axis of the power input shaft 200. The spring plate 120 is a strip-shaped plate, the shaft sleeve 110 and the power input shaft 200 are made of 45 steel, 20CrMnTi alloy steel and the like, and the spring plate 120 is made of one or more of 65Mn spring steel, 60Si2Mn or 60 CrMnA. The size of spring plate 120 width and thickness direction corresponds length and width size that is slightly less than spacing hole 111 respectively, makes spring plate 120 can penetrate in every spacing hole 111 of group and can slide, and the size of spring plate 120 length direction is that two holes of a set of spacing hole 111 lean on the distance between the outer opening, and spring plate 120's characteristics still lie in: even if the spring plate 120 is deformed maximally, both ends thereof in the longitudinal direction do not come out of the stopper hole 111.

Furthermore, the shaft barrel and the spring plate which are arranged in a split mode can be made of materials with different hardness according to input strength, and the power input is not affected by the elastic requirement of the torque limiting device, so that stable overload protection is achieved, and the power strength is not affected. The torque limiting device is simple in structure, parts are not in special shapes, processing difficulty is small, production cost is low, and replacement and maintenance are convenient and fast. The two symmetrical spring plates 120 which are the same in symmetry are additionally provided with the two symmetrical platforms 131 on the limiting transmission shaft 130, so that the centrifugal force generated by rotation is reduced, and the shaking of the transmission mechanism is reduced.

In addition, a spacer 600 is further arranged between the shaft sleeve 110 and the first bearing group 400, the spacer is made of wear-resistant materials, the outer diameter of the spacer 600 is slightly smaller than the inner diameter of the box body, the spacer 600 limits the spring plate 120 to prevent the spring plate 120 from falling off, and meanwhile the spacer 600 abuts against the first bearing 400 and the second bearing group 500. The torque limiting device is simple in structure, is very convenient to assemble in the transmission mechanism 700, and greatly reduces the difficulty of later-stage transmission mechanism maintenance and repair.

The seedling thrower transmission mechanism applying the torque limiting device 100 is characterized in that the torque limiting device is arranged at the end of the power input shaft 200, when overload occurs, the reaction is rapid, the transmission shaft in the torque limiting device slips, the power input shaft stops power input, the structure is simple, the overload protection is direct, the parts are common in production, the cost is low, and the maintenance is convenient. The torque limiting device is matched with the spring plate through the shaft sleeve, is arranged in a split mode, ensures that the transmission mechanism not only can bear high-strength power input, but also can keep stable torque limitation, and is suitable for being used in a complex agricultural machinery operation environment.

It is worth mentioning that the utility model discloses torque limiting device not only limits the setting of being applied to the embodiment and exemplify on power input shaft, can also set up on power output shaft certainly, and the same reason can be applied to power input shaft and power output shaft simultaneously, further helps drive mechanism overload protection. The utility model is suitable for a seedling throwing machine, transplanter, lawn mower, bundling machine all kinds of agricultural machinery such as, the moment of torsion restriction advantage is outstanding.

Specific embodiment two, the utility model discloses the moment of torsion does not exceed the predetermined value state, and it is shown with reference to fig. 2, fig. 3, power input shaft 200 end sets up a barrel 110, and barrel 110 one side opening is cylindricly, and barrel and power input shaft 200 cast one-piece as an organic whole, barrel 110 with set up two sets of rectangular shape through-holes in the power input shaft (200) axial vertically direction, insert 2 65Mn spring plate 120 in the through-hole, and the space that barrel 110 and spring plate 120 constitute holds the front end platform part of transmission shaft 130, two platforms 131 are just carried to spring plate 120, and when not transshipping, when the moment of torsion does not exceed the predetermined value, transmission shaft 130 does not take place to skid, and spring plate 120 does not produce deformation, has ensured power input normal input operation, realizes power transmission.

Third embodiment, the utility model discloses the moment of torsion surpasses the predetermined value transmission shaft and takes place the state of skidding, refer to fig. 2, fig. 4 shows, power input shaft 200 end sets up the shaft section of thick bamboo 110, the shaft section of thick bamboo symmetry sets up spacing hole 111, downthehole spring plate 120 who inserts restriction transmission shaft 130 front end platform 131, because spring plate 120 elastic steel material, because of having elasticity, two spring plate 120's clearance can make transmission shaft 130's front end platform 131 rotatory pass through, when taking place the overload, when the moment of torsion surpasses the predetermined value, two spring plate 120's clearance can make transmission shaft's front end platform 131 rotatory pass through, spring plate 120 takes place deformation, transmission shaft 130 front end platform 131 takes place to skid, power input stops, transmission shaft 130 skids the input of interrupt power, thereby spare part to agricultural machine protects. When the transmitted torque drops below the limit value, the spring plate 120 also recovers its original shape after the deformation occurs, and the spring plate 120 recovers the grip of the two platforms 131 of the transmission shaft 130, thereby continuing to transmit power. The utility model discloses torque limitation lasts stably, and need not to shut down after transshipping and maintain labour saving and time saving.

Further, the utility model discloses torque limiting structure, when taking place the overload moment of torsion and surpassing the predetermined value, the transmission shaft takes place to skid, does not take place to transship, and when the moment of torsion was not more than the predetermined value, the transmission shaft did not take place to skid, and power input shaft power does not take place to interrupt, and the torque limitation lasts effectively, and the overload protection reaction lasts rapidly. In addition, the power input shaft 200 and the shaft cylinder 110 are made of 45 steel or 20CrMnTi and other materials with better strength and hardness to ensure better input strength, the spring plate 120 is made of 65Mn spring steel, 60Si2Mn or 60CrMnA (when it is worth mentioning, the materials of the power input shaft, the shaft cylinder and the spring plate are not limited to the materials listed above, and are not described in detail herein), the split torque limiting structure provides stable overload protection, does not limit power transmission, and ensures the power strength of the transmission mechanism.

The novel split torque limiting structure is adopted, when the torque exceeds a preset value, slipping occurs, the spring plate deforms, transmission mechanism parts are protected, and then the spring plate automatically recovers after deformation, so that the machine does not need to be stopped for adjustment, and time and labor are saved; the split torque limiting structure has the advantages that the power input shaft and the torque limiting structure are made of materials with different hardness, stable overload protection is guaranteed, power transmission strength is not affected, the performance is reliable, the structure of the parts is simple, the processing technology is simple, the manufacturing cost is low, and the split torque limiting structure is suitable for being applied to various agricultural mechanical transmission mechanisms.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not intended to be limited to the particular embodiments disclosed herein, but rather to include all embodiments falling within the scope of the appended claims.

Claims (9)

1. The torque limiting device is characterized in that the torque limiting device (100) is arranged on a power input shaft (200) and/or a power output shaft (300) of a transmission mechanism (700), the torque limiting device (100) comprises a shaft barrel (110), a spring plate (120) and a transmission shaft (130), the shaft barrel (110) is sleeved with a platform (131) arranged at the front end of the transmission shaft (130), a limiting hole (111) is formed in the shaft barrel (110) corresponding to the platform (131), and the spring plate (120) for limiting the platform (131) is inserted into the limiting hole (111).

2. The torque limiting device according to claim 1, wherein one end of the shaft cylinder (110) is formed as one piece with the power input shaft (200) or the power output shaft (300), and the other end has a hollow opening in a circular tube shape.

3. The torque limiting device according to claim 2, wherein the limiting hole (111) is an elongated hole, which penetrates through the wall of the shaft cylinder (110) in a direction perpendicular to the axial direction of the power input shaft (200), and the limiting holes (111) are symmetrically distributed along the central axis of the power input shaft (200).

4. The torque limiting device according to claim 1, wherein the spring plate (120) is an elongated plate, and the dimensions of the spring plate (120) in the width and thickness directions correspond to the length and width dimensions slightly smaller than the limiting hole (111), respectively, so that the spring plate (120) can penetrate into the limiting hole (111) and can slide.

5. The torque limiting device according to claim 1, wherein the two platforms (131) are stepped surfaces, and a distance between the two stepped surfaces is identical to a distance between the inner sides of the two spring plates (120) after penetrating the limiting hole (111), so that the two stepped surfaces of the transmission shaft (130) can be clamped by the two spring plates (120).

6. A transmission mechanism incorporating a torque limiting device, comprising a torque limiting device as claimed in any one of claims 1 to 5.

7. The torque-limiting device applied transmission mechanism according to claim 6, wherein a first bearing set (400) is further disposed in the transmission mechanism (700), and a spacer (600) is further disposed between the shaft sleeve (110) and the first bearing set (400).

8. The torque-limiting device transmission of claim 7, wherein the spacer (600) is a circular tube, the inner diameter of the spacer (600) is slightly larger than the outer diameter of the shaft (110), and the spacer (600) limits the spring plate (120) to prevent the spring plate (120) from falling out.

9. An agricultural machine, comprising a transmission to which the torque limiting device of claim 8 is applied.

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