Overload protection transmission device and harvester

Abstract

The overload protection transmission device comprises a power input shaft, a power output shaft and a clutch device, and the clutch device is arranged between the power input shaft and the power output shaft to carry out overload protection on a transmission structure. The clutch device comprises a mounting seat, a clutch seat, an elastic assembly, a hub and a tooth pad set, wherein the mounting seat is integrated with the power input shaft and arranged at the joint of the power input shaft and the power output shaft; the power output shaft is sleeved with the clutch seat; the elastic assembly is used for pressing the mounting seat and the clutch seat; the tooth pad group comprises a first tooth pad and a second tooth pad which are in jaw connection and integrally rotate; when the rotating resistance of the power output shaft is too large, the first tooth pad and the second tooth pad are separated, and power of the power output shaft and the power of the power input shaft are separated. The overload protection transmission device and the harvester provided by the utility model are high in sensitivity, can prevent parts in operation machinery from being damaged under the condition that the torque of the output end is overlarge, and improve the reliability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing, and in particular to an overload protection transmission device and a harvester. Background Technology

[0002] During mechanical operation, if excessive resistance or overload occurs at the output end, failure to promptly cut off power can easily lead to mechanical component failure. To avoid this, overload protectors are typically installed on the output or input shaft to prevent mechanical component failure caused by excessive torque. Existing technology usually employs friction disc type overload protectors, which cut off power by causing the friction disc to slip and rotate freely. However, this method is prone to friction disc overheating, leading to thermal failure and affecting normal mechanical operation. Another commonly used type is the bidirectional jaw clutch overload protector. This type typically uses a spring on the drive shaft, with an independent spring controlling the connection of the pressure plate to achieve power separation. This independent spring-controlled pressure plate power method often suffers from imbalances at both ends of the spring, affecting the sensitivity and reliability of the overload protector. Utility Model Content

[0003] The purpose of this invention is to provide a clutch and a harvester to solve the problem of damage to mechanical parts caused by overload or excessive torque during the operation of existing harvesters.

[0004] According to one aspect of the present invention, an overload protection transmission device is provided, comprising: a power input shaft, a power output shaft drivenly connected to a power output shaft, and a clutch device; the clutch device is disposed between the power input shaft and the power output shaft, and includes:

[0005] Mounting base, the mounting base is integrally formed with the power input shaft and is disposed at the connection between the power input shaft and the power output shaft;

[0006] A clutch seat, which is sleeved on the power output shaft, and the clutch seat includes a clutch seat cavity;

[0007] The elastic components, comprising at least two components arranged circumferentially along the clutch seat, are used to press the mounting base against the clutch seat.

[0008] A hub, which is sleeved on the power output shaft and rotates integrally with the power input shaft and the power output shaft, and is located at the connection between the power input shaft and the power output shaft;

[0009] A toothed pad assembly is placed inside the clutch seat cavity. The toothed pad assembly includes a first toothed pad that is fitted to the hub and rotates integrally with it, and a second toothed pad that is fitted to the inner surface of the clutch seat and rotates integrally with it. The first toothed pad and the second toothed pad are toothedly connected and rotate integrally with it.

[0010] The power input shaft transmits power to the power output shaft and clutch seat through the hub. The second toothed pad and the clutch seat rotate synchronously with the power input shaft. When the rotational resistance of the power output shaft is too large, the first toothed pad separates from the second toothed pad, the hub and the first toothed pad stop rotating with the power output shaft, and the power output shaft is separated from the power input shaft.

[0011] The clutch seat is equipped with circumferentially elastic components, which enhances the sensitivity of overload protection for the power input and output shafts during power transmission, allowing for timely disconnection of power from the power input and output shafts. Simultaneously, the first and second toothed pads utilize a jaw-clutch connection, ensuring the reliability of power connection and disconnection between the power input and output shafts, thereby reducing overload wear on mechanical components.

[0012] Preferably, the hub includes an axially arranged straight portion and a radially arranged vertical portion, the straight portion being positioned between the inner surface of the power input shaft and the outer surface of the power output shaft, and the vertical portion being positioned between the mounting base and the clutch seat.

[0013] Preferably, the vertical portion includes a first groove arranged along the circumference of the hub, and a first protrusion is provided on the side of the first toothed pad that is in contact with the vertical portion. The first groove and the first protrusion are fitted together, and the first toothed pad rotates synchronously with the hub.

[0014] Preferably, a second groove is provided on the inner surface of the clutch seat along the circumference of the clutch seat, and a second protrusion is provided on the side of the second toothed pad that is in contact with the inner surface of the clutch seat. The second groove and the second protrusion are engaged, and the second toothed pad rotates synchronously with the clutch seat.

[0015] By setting the first protrusion, the second protrusion, the first groove, and the second groove, the first toothed pad can be effectively connected to the hub, and the second toothed pad can be connected to the clutch seat, ensuring stable power separation and transmission between the power input shaft and the power output shaft.

[0016] Preferably, the elastic component includes a fixing pin connecting the mounting base and the clutch seat, a compression spring disposed on one side of the clutch seat and sleeved on the fixing pin for pressing the clutch and the mounting base, and a nut sleeved on the fixing pin for limiting the compression spring; a spacer tube is provided between the compression spring and the fixing pin.

[0017] The elastic components are evenly arranged along the circumference of the clutch seat. The compression spring is connected to the clutch seat, which can improve the sensitivity of torque changes of the power input shaft, control the separation of the first toothed pad and the second toothed pad, and improve the reliability of overload protection.

[0018] Preferably, the wheel hub is fixed to the power output shaft by bolts, and a first washer is provided between the wheel hub and the power output shaft. The first washer is fixed to the surface of the wheel hub by the bolts.

[0019] Preferably, the mounting base is provided with a mounting cavity, which is connected to the straight portion; a second gasket is provided between the mounting base and the wheel hub.

[0020] Preferably, a hub mounting seat is provided at one end of the power output shaft that is connected to the hub, and the hub and the hub mounting seat are connected by a spline or a flat key.

[0021] Preferably, the clutch seat is further provided with a limiting part, which limits the movable position of the compression spring.

[0022] The present invention provides an overload protection transmission device with high sensitivity and high reliability. It can cut off the power in time when the load equipment is overloaded, so as to avoid damage to the mechanical equipment parts. It has the advantages of simple structure and low production cost.

[0023] This utility model also provides a harvester, including the overload protection transmission device as described in any of the above claims. The harvester header provided by this utility model can effectively reduce the failure rate of header components, and can promptly cut off power when the header is entangled in grass, resulting in excellent operating performance and high reliability. Attached Figure Description

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] Figure 1 A schematic diagram of an overload protection transmission device provided by this utility model.

[0026] Figure 2 This is a side view of an overload protection transmission device provided by the present invention.

[0027] Figure 3 for Figure 2 A cross-sectional view along the AA1 direction.

[0028] Figure 4 A schematic diagram of a partial structure of an overload protection transmission device provided by this utility model. Figure 1 .

[0029] Figure 5A schematic diagram of a partial structure of an overload protection transmission device provided by this utility model. Figure 2 .

[0030] Figure 6 This is a schematic diagram of the protection state of an overload protection transmission device provided by this utility model.

[0031] Figure 7 This is a schematic cross-sectional view of the overload protection transmission device provided by this utility model.

[0032] Figure 8 This is a schematic diagram illustrating the application of a harvester provided by this utility model.

[0033] Explanation of icon numbers:

[0034] 100 - Overload protection transmission device; 1 - Power input shaft; 2 - Power output shaft; 21 - Bolt; 3 - Clutch device; 31 - Mounting seat; 311 - Mounting cavity; 32 - Clutch seat; 321 - Clutch seat cavity; 322 - Second groove; 323 - Limiting part; 33 - Elastic component; 331 - Fixing pin; 332 - Compression spring; 333 - Nut; 334 - Interval tube; 34 - Hub; 341 - Straight part; 342 - Vertical part; 341 - First groove; 342 - First washer; 35 - Tooth washer assembly; 351 - First tooth washer; 3511 - First protrusion; 352 - Second tooth washer; 3521 - Second protrusion; 36 - Second washer. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0037] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0041] See Figures 1 to 8As shown, the embodiment provides an overload protection transmission device 100 capable of bidirectional power transmission and separation, including a power input shaft 1, a power output shaft 2, and a clutch device 3. The power input shaft 1 and the power output shaft 2 are connected and disconnected via the clutch device 3. The clutch device 3 is disposed between the power input shaft 1 and the power output shaft 2 to achieve power connection and disconnection between them. Specifically, the clutch device 3 includes a mounting base 31, a clutch seat 32, an elastic component 33, a hub 34, and a gear set 35. The mounting base 31 is integrally formed with the power input shaft 1, located at the connection between the power input shaft 1 and the power output shaft 2, and rotates integrally with the power input shaft 1. The clutch seat 32 is located at the connection point between the power output shaft 2 and the power output shaft 2, and the clutch seat 32 rotates integrally with the power output shaft 2. The clutch seat 32 has a clutch cavity, the position of which is opposite to the position of the mounting seat 31. The clutch seat 32 and the mounting seat 31 are connected by an elastic component 33. The elastic component 33 is arranged circumferentially around the clutch seat 32, pressing the mounting seat 31 and the clutch seat 32 together. In this embodiment, at least two elastic components 33 are included. The more elastic components 33 there are, the stronger the overload sensing capability of the clutch device 3 and the higher the sensitivity. The hub 34 is sleeved on one end of the power output shaft 2 and rotates integrally with the power output shaft 2. The hub 34 is located at the connection point between the power input shaft 1 and the power output shaft 2 and is connected to the power input shaft 1, transmitting the power input shaft 1 to the power output shaft. The toothed pad assembly 35 includes a first toothed pad 351 and a second toothed pad 352, and is disposed in the inner cavity 321 of the clutch seat. The second toothed pad 352 is fixedly connected to the inner cavity 321 of the clutch seat and fits against the inner surface of the clutch seat 32. The first toothed pad 351 fits against the hub 34 and rotates synchronously with the hub 34. The second toothed pad 352 rotates synchronously with the clutch seat 32. The first toothed pad 351 and the second toothed pad 352 are connected by a toothed engagement mechanism. In this embodiment, the mating surfaces of the first toothed pad 351 and the second toothed pad 352 have staggered toothed structures. The toothed structures of the first toothed pad 351 and the second toothed pad 352 engage with each other, thereby achieving the connection between the first toothed pad 351 and the second toothed pad 352. When the torque of the power output shaft 2 is normal, the first toothed pad 351 and the second toothed pad 352 engage with each other and achieve synchronous rotation. In the specific implementation process, the power output shaft 2 transmits power to the power output shaft 2 through the hub 34, and the clutch seat 32 is connected to the mounting seat 31 through the elastic component 33, so the clutch seat 32 rotates synchronously with the power input shaft 1.When the transmission torque is normal, the power output shaft 2 transmits power normally to the power output shaft 2 through the clutch device 3. When the torque on the power output shaft 2 is too large, the power between the power input shaft 1 and the power output shaft 2 is cut off through the clutch device 3. At this time, the first toothed pad 351 and the second toothed pad 352 in the clutch device 3 no longer engage, and the toothed structure of the first toothed pad 351 separates from the toothed structure of the second toothed pad 352. The clutch seat 32 compresses the elastic component 33, and the first toothed pad 351, the hub 34, and the power output shaft 2 no longer rotate. The second toothed pad 352 is connected to the clutch seat 32, and the mounting seat 31 on the power input shaft 1 still rotates synchronously with the power input shaft 1. Therefore, the clutch seat 32 connected to the mounting seat 31 and the second toothed pad 352 rotate synchronously with the power input shaft 1, and the power of the power input shaft 1 and the power output shaft 2 are separated. In this embodiment, the power input shaft 1 of the overload protection transmission device 100 is continuously powered while the power output shaft 2 is disconnected, which can protect mechanical parts in time and prevent damage to parts during operation due to excessive load, thus avoiding affecting the progress of the operation.

[0042] Furthermore, to ensure a stable connection between the clutch device 3 and the power input shaft 1 and power output shaft 2 during power transmission, a straight portion 341 is provided axially on the hub 34, and a vertical portion 342 is provided radially to facilitate the transmission of the power input shaft 1 and the power output shaft 2. The straight portion 341 is positioned between the inner surface of the power input shaft 1 and the outer surface of the power output shaft 2, while the vertical portion 342 is positioned between the mounting base 31 and the clutch seat 32, connecting the mounting base 31 and the clutch seat 32. To connect the hub 34 with the first toothed pad 351, multiple first grooves 341 are provided on the vertical portion 342 along the circumference of the hub 34. A corresponding number of first protrusions 3511 are provided symmetrically on the first toothed pad 351 and the first grooves 341 on the vertical portion 342. The first protrusions 3511 engage with the first grooves 341, thereby ensuring a tight connection between the first toothed pad 351 and the hub 34, enabling the first toothed pad 351 and the hub 34 to rotate synchronously. A second groove 322 is provided on the inner surface of the clutch seat 32 along the circumference of the clutch seat 32. The second groove 322 has the same structure and function as the first groove 341. A second protrusion 3521 corresponding to the number and position of the second groove 322 is provided on the side of the second tooth pad 352 that is in contact with the inner surface of the clutch seat 32. The second protrusion 3521 is engaged with the second groove 322, so that the second tooth pad 352 can always rotate synchronously with the clutch seat 32.

[0043] The elastic component 33 includes a fixing pin 331 for connecting the mounting base 31 and the clutch seat 32, and a compression spring 332. The fixing pin 331 fixes the mounting base 31 and the clutch seat 32. The compression spring 332 is disposed on the clutch seat 32 on one side of the clutch seat 32 to limit the connection position with the fixing pin 331. The compression spring 332 is sleeved on the fixing pin 331 to press the clutch seat 32 and the mounting base 31 together. To ensure that the compression spring 332 limits the position of the clutch seat 32 within a certain range, a nut 333 is provided on the fixing pin 331 to limit the compression spring 332, so that the displacement position of the compression spring 332 on the fixing pin 331 is constant. At the same time, a spacer tube 334 is provided at the middle position between the compression spring 332 and the fixing pin 331. The compression spring 332 is sleeved on the spacer tube 334. When the mounting base 31 and the clutch seat 32 are pressed together, the force is evenly distributed on the compression spring 332, and the force on the compression spring 332 in the longitudinal direction remains on the same straight line.

[0044] Furthermore, to prevent the hub 34 from shifting or falling off the power output shaft 2, the hub 34 is fixed to the power output shaft 2 by bolts 21. The bolts 21 fix the nut 333 to one side of the power output shaft 2, thereby achieving synchronous rotation of the power input shaft 1 and the power output shaft 2. A first washer 342 is provided at the connection between the hub 34 and the power output shaft 2. By providing the first washer 342, the higher the reliability of the bolts 21 when they are attached to the surface of the hub 34, the stronger the connection stability between the hub 34 and the power output shaft 2.

[0045] To ensure smooth power transmission from the power output shaft 2, a mounting cavity 311 is provided in the mounting base 31. The mounting cavity 311 is connected to the straight part 341. During the rotation of the power input shaft 1, the mounting cavity 311 rotates synchronously with the power input shaft 1. Since the straight part 341 is connected to the mounting cavity 311, the hub 34 rotates synchronously with the mounting cavity 311. This method ensures stable power transmission from the power output shaft 2 to the power input shaft 1. To avoid wear, a second shim 36 is also provided between the mounting base 31 and the hub 34.

[0046] To maintain the synchronous rotation of the hub 34 and the power output shaft 2, a hub 34 mounting seat 31 is provided on the side of the power output shaft 2 connected to the hub 34. The hub 34 mounting seat 31 can be connected to the hub 34 by spline or flat key connection, so that the hub 34 and the power output shaft 2 can maintain stable synchronous rotation.

[0047] In a preferred embodiment, the clutch seat 32 is further provided with a limiting part 323, which is used to limit the setting position and moving position of the pressure spring 332, so as to further ensure that the pressure spring 332 is subjected to uniform force, thereby ensuring the reliability of the overload protection of the clutch device 3.

[0048] This embodiment provides a harvester that employs the aforementioned overload protection transmission device 100 to ensure reliable operation. In a specific embodiment, the harvester header is used as an example. The overload protection transmission device 100 provided in this embodiment is installed on the harvester header and is used for the transmission of the header auger. Specifically, the power output shaft 2 is connected to the harvester auger. During header operation, when the auger auger is entangled in grass, the load on the power output shaft 2 is significant. If not handled promptly, it can easily damage the internal gears of the header as the auger continues to operate, affecting subsequent harvesting. With this overload protection transmission device 100, when the header auger is entangled in grass, if the torque at the end of the power output shaft 2 is too large, the first toothed pad 351 and the second toothed pad 352 change from their original toothed engagement state to a disengaged state. The power input shaft 1 and the power output shaft 2 are disconnected. Therefore, even if the power output shaft 2 continues to rotate, it remains stationary, thus protecting the header assembly. By setting up an overload protection transmission device 100, when the load on the power output shaft 2 is large, the clutch device 3 can cut off the power transmission from the power input shaft 1 to the power output shaft 2 in time, so that the auger stops rotating and avoids the cutting table from becoming blocked and causing damage to the cutting table parts.

[0049] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. An overload protection transmission device, characterized in that, include: Power input shaft; A power output shaft, wherein the power input shaft is connected to the power output shaft in a transmission manner; A clutch device, wherein the clutch device is located between the power input shaft and the power output shaft, comprises: Mounting base, the mounting base is integrally formed with the power input shaft and is disposed at the connection between the power input shaft and the power output shaft; A clutch seat, which is sleeved on the power output shaft, and the clutch seat includes a clutch seat cavity; The elastic components, comprising at least two components arranged circumferentially along the clutch seat, are used to press the mounting base against the clutch seat. A hub, which is sleeved on the power output shaft and rotates integrally with the power input shaft and the power output shaft, and is located at the connection between the power input shaft and the power output shaft; A toothed pad assembly is placed inside the clutch seat cavity. The toothed pad assembly includes a first toothed pad that is fitted to the hub and rotates integrally with it, and a second toothed pad that is fitted to the inner surface of the clutch seat and rotates integrally with it. The first toothed pad and the second toothed pad are toothedly connected and rotate integrally with it. The power input shaft transmits power to the power output shaft and clutch seat through the hub. The second toothed pad and the clutch seat rotate synchronously with the power input shaft. When the rotational resistance of the power output shaft is too large, the first toothed pad separates from the second toothed pad, the hub and the first toothed pad stop rotating with the power output shaft, and the power output shaft is separated from the power input shaft.

2. The overload protection transmission device as described in claim 1, characterized in that, The hub includes an axially arranged straight portion and a radially arranged vertical portion. The straight portion is located between the inner surface of the power input shaft and the outer surface of the power output shaft, and the vertical portion is located between the mounting base and the clutch seat.

3. The overload protection transmission device as described in claim 2, characterized in that, The vertical portion includes a first groove arranged along the circumference of the hub, and a first protrusion is provided on the side of the first toothed pad that is in contact with the vertical portion. The first groove and the first protrusion are fitted together, and the first toothed pad rotates synchronously with the hub.

4. The overload protection transmission device as described in claim 3, characterized in that, The inner surface of the clutch seat is provided with a second groove along the circumference of the clutch seat, and the side of the second tooth pad that is in contact with the inner surface of the clutch seat is provided with a second protrusion. The second groove and the second protrusion are engaged, and the second tooth pad rotates synchronously with the clutch seat.

5. The overload protection transmission device as described in claim 4, characterized in that, The elastic component includes a fixing pin connecting the mounting base and the clutch seat, a compression spring disposed on one side of the clutch seat and sleeved on the fixing pin for pressing the clutch seat and the mounting base, and a nut sleeved on the fixing pin for limiting the compression spring; a tube is provided between the compression spring and the fixing pin.

6. The overload protection transmission device as described in claim 5, characterized in that, The wheel hub is fixed to the power output shaft by bolts, and a first shim is provided between the wheel hub and the power output shaft. The first shim is fixed to the surface of the wheel hub by the bolts.

7. An overload protection transmission device as described in claim 6, characterized in that, The mounting base is provided with an inner cavity, which is connected to the straight portion; a second gasket is provided between the mounting base and the wheel hub.

8. The overload protection transmission device as described in claim 7, characterized in that, A hub mounting seat is provided at one end of the power output shaft that is connected to the hub, and the hub and the hub mounting seat are connected by a spline or a flat key.

9. An overload protection transmission device as described in claim 8, characterized in that, The clutch seat is also provided with a limiting part, which limits the movable position of the compression spring.

10. A harvester, characterized in that, Includes the overload protection transmission device as described in any one of claims 1-9.

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