Torque limiter and harvester

Abstract

The torque limiter comprises a conduction shaft, an elastic assembly and a hub, the elastic assembly comprises a plurality of elastic units, one ends of the elastic units are connected with the outer wall of the conduction shaft, the hub is arranged on the outer sides of the elastic units in a sleeving mode, and a plurality of torque limiting grooves are formed in the inner wall of the hub; the other ends of the elastic units are inserted into the torque limiting grooves in a one-to-one correspondence mode or retreat from the torque limiting grooves under the action of the elastic force of the elastic units. The torque limiter has the advantages that torque limiting is achieved under the condition that an existing transmission route and an existing transmission mode are not changed, torque limiting is achieved only through the elastic assembly and the hub, the torque limiter is simple in structure, light in weight, high in strength and low in failure rate, the weight, the failure rate and the maintenance cost of the torque limiter are reduced, and the competitiveness of products is improved.

Description

Technical Field

[0001] The utility model relates to the field of torque limiters, and particularly relates to a torque limiter and a harvester. Background Art

[0002] The torque limiter is one of the important working components of the transmission gearbox of wheat and corn harvesters. Its main function is to transmit power to the conveying systems such as harvesting, returning to the field, and threshing of wheat and corn harvesters, and when the load is overloaded, it disconnects the transmission to avoid faults such as gear teeth breakage, shaft breakage, and housing rupture in the transmission gearbox.

[0003] At present, the torque limiting devices adopted by the mainstream wheat and corn harvester gearboxes on the market generally directly set vulnerable parts or set safety clutches. The vulnerable parts have destructive factors. Once the whole machine is over-torqued, the vulnerable parts break, thus disconnecting the transmission. The vulnerable parts need to be replaced, which affects the harvesting efficiency of users. Moreover, the frequent replacement of vulnerable parts easily causes complaints from users. The safety clutch has the disadvantages of complex structure, thick and bulky appearance, and large overall weight. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is how to provide a torque limiter with a simple structure and light weight.

[0005] The technical solution of the utility model to solve the above technical problem is as follows: A torque limiter includes a conduction shaft, an elastic component, and a hub. The elastic component includes a plurality of elastic units. One ends of the plurality of elastic units are connected to the outer wall of the conduction shaft. The hub is sleeved outside the plurality of elastic units, and the inner wall of the hub has a plurality of torque limiting grooves; the other ends of the plurality of elastic units are inserted into the plurality of torque limiting grooves one by one under the action of their own elastic forces, or withdrawn from the torque limiting grooves.

[0006] The beneficial effect of the utility model is that the other ends of the elastic units of the torque limiter are inserted into the torque limiting grooves, so that power can be transmitted between the conduction shaft and the hub; when the torque between the conduction shaft and the hub exceeds the preset value, the inner wall of the hub squeezes the elastic units, causing the other ends of the elastic units to withdraw from the torque limiting grooves, and relative rotation occurs between the two, thus disconnecting the transmission. It avoids faults such as gear teeth breakage, shaft breakage, and housing rupture caused by overload, and plays a role of flexible connection, buffering, and overload protection.

[0007] The torque limiter realizes torque limitation under the condition that the existing transmission route and transmission method remain unchanged. Only the elastic component and the hub are used to realize torque limitation. The torque limiter has a simple structure, light weight, high strength, and low failure rate, reduces the weight, failure rate, and maintenance cost of the torque limiter, and improves the competitiveness of the product.

[0008] On the basis of the above technical solutions, the present utility model can be further improved as follows.

[0009] Further, the elastic unit includes a spring seat and an elastic member. One end of the elastic member is connected to the outer wall of the conduction shaft, and the other end of the elastic member abuts against one end of the spring seat. The other end of the spring seat is inserted into the corresponding torque limiting groove or withdrawn from the torque limiting groove under the action of the elastic force of the elastic member.

[0010] The beneficial effect of adopting the above further solution is that the elastic member applies an elastic force to the spring seat to make it insert into the torque limiting groove, and the cooperation between the spring seat and the torque limiting groove realizes torque limitation.

[0011] Further, a convex portion is provided in the middle of the other end of the spring seat, and the width d of the convex portion along the circumferential direction of the hub is smaller than the width D of the torque limiting groove along the circumferential direction of the hub.

[0012] The beneficial effect of adopting the above further solution is that the spring seat is provided with a convex portion, and the convex portion is used to insert into or withdraw from the torque limiting groove to realize the transmission or disconnection between the conduction shaft and the hub.

[0013] Further, a groove is provided on the end face of the convex portion facing the hub.

[0014] The beneficial effect of adopting the above further solution is that a groove is provided on the end face of the convex portion facing the hub, reducing the contact area between the convex portion and the hub, thereby reducing the wear when the two rotate relative to each other.

[0015] Further, multiple groups of the elastic components are arranged at intervals along the axial direction of the conduction shaft.

[0016] The beneficial effect of adopting the above further solution is that by setting an appropriate number of elastic components, the rated torque of the torque limiter can be adjusted.

[0017] Further, a plurality of mounting holes are provided at intervals on the outer wall of the conduction shaft, and one end of each of the plurality of elastic units is correspondingly arranged in the mounting holes.

[0018] The beneficial effect of adopting the above further solution is that the elastic unit is installed in the mounting hole, and the mounting hole is used to limit its position. The installation is simple and the reliability is high.

[0019] Further, the elastic unit is arranged radially along the conduction shaft.

[0020] Further, it further includes a conduction gear, and the conduction gear is sleeved outside the hub and connected to the hub.

[0021] The beneficial effect of adopting the above further solution is that the conduction shaft transmits power to the hub, and the hub then transmits the power to the subsequent mechanism through the conduction gear.

[0022] Further, it further includes a first retaining ring and a second retaining ring. Both the first retaining ring and the second retaining ring are fixedly connected to the conduction shaft and are abutted against both ends of the hub.

[0023] The beneficial effect of adopting the above further solution is that the first retaining ring and the second retaining ring axially limit the hub to prevent the hub from axially sliding.

[0024] The present utility model further provides a harvester, including the torque limiter described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a torque limiter of the present utility model;

[0026] Figure 2 It is a three-dimensional view of a torque limiter of the present utility model;

[0027] Figure 3 It is a front view of a torque limiter of the present utility model;

[0028] Figure 4 is Figure 3 A - A cross-sectional view of the torque limiter;

[0029] Figure 5 is Figure 4 A partial enlarged view of the B position of the elastic unit;

[0030] Figure 6 It is a three-dimensional view of the hub;

[0031] Figure 7 It is a left view of the hub;

[0032] Figure 8 It is a three-dimensional view of the spring seat;

[0033] Figure 9 It is a cross-sectional view of the spring seat.

[0034] In the drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Conduction shaft; 2. First retaining ring; 3. Conduction gear; 4. Hub; 41. Torque limiting groove; 5. Spring seat; 51. Protrusion; 52. Groove; 6. Elastic member; 7. Second retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0037] As Figures 1-9As shown in the figure, this embodiment provides a torque limiter, which includes a conduction shaft 1, an elastic component, and a hub 4. The elastic component includes a plurality of elastic units. One ends of the plurality of elastic units are connected to the outer wall of the conduction shaft 1, the hub 4 is sleeved outside the plurality of elastic units, and the inner wall of the hub 4 has a plurality of torque limiting grooves 41; the other ends of the plurality of elastic units are inserted into the plurality of torque limiting grooves 41 one by one under the action of their own elastic forces, or withdrawn from the torque limiting grooves 41.

[0038] When the other ends of the elastic units of the torque limiter are inserted into the torque limiting grooves 41, power can be transmitted between the conduction shaft 1 and the hub 4; when the torque between the conduction shaft 1 and the hub 4 exceeds the preset value (that is, the torque between the conduction shaft 1 and the hub 4 exceeds the frictional force between the hub 4 and the elastic component and can push the elastic unit to compress and withdraw from the torque limiting groove 41), the inner wall of the hub 4 squeezes the elastic unit, causing the other end of the elastic unit to withdraw from the torque limiting groove 41, and the two rotate relatively, thus disconnecting the transmission. This avoids faults such as gearbox tooth breakage, shaft breakage, and housing rupture caused by overload, and plays a role in flexible connection, buffering, and overload protection.

[0039] The torque limiter realizes torque limitation under the condition that the existing transmission route and transmission method remain unchanged. Only the elastic component and the hub 4 are used to realize torque limitation. The torque limiter has a simple structure, light weight, high strength, and low failure rate, reducing the weight, failure rate, and maintenance cost of the torque limiter, and improving the competitiveness of the product.

[0040] Specifically, one ends of the plurality of elastic units are abutted against or fixed to the outer wall of the conduction shaft 1.

[0041] Specifically, as Figure 7 shown, the cross-section of the torque limiting groove 41 is arc-shaped, which is convenient for limiting the position of the end of the elastic unit and allows the elastic unit to slide out of the torque limiting groove 41 during overload. More specifically, the edge of the torque limiting groove 41 and the hub 4 are transitioned by a fillet. Alternatively, the cross-section of the torque limiting groove 41 can also be trapezoidal or triangular.

[0042] On the basis of any of the above solutions, the elastic unit includes a spring seat 5 and an elastic member 6. One end of the elastic member 6 is connected to the outer wall of the conduction shaft 1, the other end of the elastic member 6 abuts against one end of the spring seat 5, and the other end of the spring seat 5 is inserted into the corresponding torque limiting groove 41 or withdrawn from the torque limiting groove 41 under the action of the elastic force of the elastic member 6.

[0043] The elastic member 6 exerts an elastic force on the spring seat 5 to make it insert into the torque limiting groove 41, and the spring seat 5 cooperates with the torque limiting groove 41 to realize torque limitation.

[0044] Specifically, one end of the spring seat 5 has a spring seat groove, and the other end of the elastic member 6 is located in the spring seat groove.

[0045] Optionally, the elastic member 6 is a spring or other elastic material.

[0046] Based on any of the above solutions, as Figure 5 、 Figure 8 and Figure 9 shown, the middle of the other end of the spring seat 5 has a convex portion 51, and the width d of the convex portion 51 along the circumferential direction of the hub 4 is smaller than the width D of the torque limiting groove 41 along the circumferential direction of the hub 4.

[0047] The convex portion 51 is provided on the spring seat 5, and the transmission or disconnection between the transmission shaft 1 and the hub 4 is realized by inserting or withdrawing the convex portion 51 into or out of the torque limiting groove 41.

[0048] Specifically, the convex portion 51 and the two side end faces of the other end of the spring seat 5 are transitioned by a fillet.

[0049] Based on any of the above solutions, as Figure 8 and Figure 9 shown, the end face of the convex portion 51 facing the hub 4 has a groove 52.

[0050] The groove 52 is provided on the end face of the convex portion 51 facing the hub 4, reducing the contact area between the convex portion 51 and the hub 4, thereby reducing the wear during the relative rotation of the two.

[0051] Based on any of the above solutions, multiple groups of the elastic components are axially spaced along the transmission shaft 1.

[0052] By setting an appropriate number of elastic components, the rated torque of the torque limiter is adjusted. Among them, the rated torque is the maximum torque that can be transmitted between the transmission shaft 1 and the hub 4. After exceeding the rated torque, the spring seat 5 will be pushed to compress the elastic member 6, and the spring seat 5 will withdraw from the torque limiting groove 41, and the transmission shaft 1 and the hub 4 will rotate relatively.

[0053] Based on any of the above solutions, a plurality of mounting holes are spaced on the outer wall of the transmission shaft 1, and one end of each of the plurality of elastic units is correspondingly arranged in the mounting holes.

[0054] The elastic unit is installed in the mounting hole, and the mounting hole is used to limit it, which is simple to install and has high reliability.

[0055] Specifically, the spring seat 5 is in sliding fit with the mounting hole, and one end of the elastic member 6 abuts against the mounting hole.

[0056] Based on any of the above solutions, the elastic unit is arranged radially along the transmission shaft 1.

[0057] Correspondingly, the mounting holes are also arranged radially along the transmission shaft 1.

[0058] Based on any of the above solutions, a transmission gear 3 is further included. The transmission gear 3 is sleeved outside the wheel hub 4 and connected to the wheel hub 4.

[0059] The transmission shaft 1 transmits power to the wheel hub 4, and the wheel hub 4 then transmits the power to the subsequent mechanism through the transmission gear 3.

[0060] Wherein, the transmission gear 3 is fixedly connected or integrally formed with the wheel hub 4; or the transmission gear 3 is spline-connected to the wheel hub 4, and retaining rings are fixed at both ends of the wheel hub 4 to axially limit the transmission gear 3.

[0061] Based on any of the above solutions, a first retaining ring 2 and a second retaining ring 7 are further included. The first retaining ring 2 and the second retaining ring 7 are both fixedly connected to the transmission shaft 1 and abut against both ends of the wheel hub 4.

[0062] The first retaining ring 2 and the second retaining ring 7 axially limit the wheel hub 4 to prevent the wheel hub 4 from axially sliding.

[0063] This embodiment further provides a harvester, including the torque limiter described above.

[0064] In one specific example, the transmission shaft 1 is a transmission shaft in the transmission gearbox of the harvester. Alternatively, this torque limiter can also be applied to other transmission structures of the harvester.

[0065] In one specific embodiment, when the torque limiter is transmitting power normally, the torque received by the transmission gear 3 is within the rated torque range. The convex portion 51 of the spring seat 5 is inserted into the torque limiting groove 41 under the elastic force of the elastic member 6, and the transmission shaft 1 drives the wheel hub 4 to rotate through the spring seat 5.

[0066] When the torque received by the transmission gear 3 exceeds the set maximum transmission torque (rated torque), the transmission gear 3 reacts the power to the wheel hub 4. The wheel hub 4 pushes the inclined side wall of the convex portion 51 of the spring seat 5 through the inner torque limiting groove 41. While the wheel hub 4 transmits the circumferential force to the spring seat 5 through the inner torque limiting groove 41, the wheel hub 4 exerts a pressure towards the axis on the spring seat 5 through the torque limiting groove 41, and the spring seat 5 compresses the elastic member 6 towards the axis. In other words, in this movement process, when the torque transmitted by the transmission gear 3 exceeds the set limit, the wheel hub 4 pushes the spring seat 5 to compress the elastic member 6, making the highest point of the convex portion 51 of the spring seat 5 lower than the lowest point of the inner wall of the wheel hub 4. In this way, the wheel hub 4 continuously crosses over the spring seat 5, forming a slipping phenomenon, thereby disconnecting the transmission between the transmission shaft 1 and the wheel hub 4.

[0067] When the torque received by the transmission gear 3 of the torque limiter exceeds the set maximum transmission torque, during the process that the transmission gear 3 drives the hub 4 to continuously slip on the spring seat 5, the frictional torque is relatively large, and there is a large frictional force between the hub 4 and the spring seat 5, which will accelerate the damage of the parts. To meet the technical requirement that the slip between the hub 4 and the spring seat 5 exceeds 1 million times, the materials of the hub 4 and the spring seat 5 are specially designed. Both surfaces are carburized and quenched, and the surface hardness reaches 58 - 63 HRC, and the number of slip times exceeds 1 million times.

[0068] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0070] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0072] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A torque limiter, characterized in that: The invention comprises a transmission shaft (1), an elastic component and a wheel hub (4), wherein the elastic component comprises a plurality of elastic units, one end of each of the elastic units is connected to the outer wall of the transmission shaft (1), the wheel hub (4) is sleeved on the outer sides of the elastic units, and the inner wall of the wheel hub (4) has a plurality of torque limiting grooves (41); the other ends of the elastic units are inserted into the torque limiting grooves (41) one by one or withdraw from the torque limiting grooves (41) under the action of their own elastic force.

2. A torque limiter according to claim 1, characterized in that: The elastic unit comprises a spring seat (5) and an elastic member (6), one end of the elastic member (6) is connected to the outer wall of the conductive shaft (1), the other end of the elastic member (6) is in contact with one end of the spring seat (5), and the other end of the spring seat (5) is inserted into the corresponding torque limiting groove (41) or withdraws from the torque limiting groove (41) under the elastic force of the elastic member (6).

3. A torque limiter according to claim 2, characterized in that: The other end of the spring seat (5) has a protrusion (51) in the middle, and the width d of the protrusion (51) along the circumference of the hub (4) is smaller than the width D of the torque limiting groove (41) along the circumference of the hub (4).

4. A torque limiter according to claim 3, characterized in that: The protrusion (51) has a groove (52) on one end surface facing the hub (4).

5. A torque limiter according to claim 1, characterized in that: A plurality of groups of elastic components are arranged at intervals along the axial direction of the conductive shaft (1).

6. A torque limiter according to claim 1, characterized in that: The outer wall of the conduction shaft (1) is provided with a plurality of mounting holes at intervals, and one end of the plurality of elastic units is arranged in the mounting holes in a one-to-one correspondence.

7. A torque limiter according to claim 1, characterized in that: The elastic unit is arranged radially along the conductive shaft (1).

8. A torque limiter according to any one of claims 1 to 7, characterized in that: It also comprises a transmission gear (3), wherein the transmission gear (3) is sleeved on the outside of the wheel hub (4) and connected to the wheel hub (4).

9. A torque limiter according to any one of claims 1 to 7, characterized in that: It also comprises a first retaining ring (2) and a second retaining ring (7), wherein the first retaining ring (2) and the second retaining ring (7) are both fixedly connected to the conductive shaft (1) and abut against two ends of the wheel hub (4).

10. A harvester, characterized in that: Comprising a torque limiter as claimed in any one of claims 1 to 9.

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