A load-limiting device

Abstract

The present invention discloses a load limiting device, which includes a housing, a driving component disposed at one end inside the housing; an output shaft disposed at the other end inside the housing and arranged in parallel with the driving component; a clutch sleeved on the output shaft; a speed reduction component disposed on one side inside the housing, with one end of the speed reduction component connected to the driving component and the other end connected to the clutch; a flange coupling connected to the output shaft; wherein, the maximum thickness of the housing is consistent with the maximum axial dimension of the driving component; the driving component, the speed reduction component, the clutch, the output shaft and the flange coupling are connected in a U shape. The load limiting device in the present invention realizes the load limiting function through the clutch, and at the same time connects the driving component, the output shaft and the clutch in the same housing through the speed reduction component, and the driving component, the output shaft and the clutch are arranged in parallel, saving the axial space of the whole device, simplifying the device structure, thereby greatly reducing the volume and weight of the equipment and significantly reducing the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and particularly relates to a load limiting device. Background Art

[0002] Hydraulic power systems are widely used in impact variable load working conditions. For example, in the application work of the reinforced concrete cutting industry, due to reasons such as uneven material of the object being cut and cutting seam deformation, there is a possibility of sudden change in load during cutting. Since the hydraulic system has a pressure limiting overflow device, when the sudden load impact exceeds the set pressure value, the overflow device instantaneously intervenes in work, and the pressure limiting overflow valve overflows to ensure that the equipment does not work overloaded, effectively filtering out all impacts exceeding the set pressure value, and at the same time maintaining the set pressure work to avoid equipment damage and potential safety hazards.

[0003] However, the structure of the hydraulic power system is relatively complex, with a large volume and heavy weight. It also requires multiple high-pressure oil pipes to transmit power, resulting in an excessively high overall production cost.

[0004] Therefore, the existing technology still needs to be improved. Summary of the Invention

[0005] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a load limiting device, aiming to solve the problem of high cost caused by the complex structure of the existing hydraulic system when realizing the load limiting function.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An embodiment of the present invention provides a load limiting device, including a housing, and further including:

[0008] A driving component, arranged at one end inside the housing;

[0009] An output shaft, arranged at the other end inside the housing, and arranged parallel to the driving component;

[0010] A clutch, sleeved on the output shaft;

[0011] A speed reduction component, arranged on one side inside the housing, with one end of the speed reduction component connected to the driving component and the other end connected to the clutch;

[0012] Wherein, the maximum thickness of the housing is consistent with the maximum axial dimension of the driving component.

[0013] Further, in the load limiting device, the maximum axial dimension of the clutch is consistent with the thickness dimension of one side inside the housing.

[0014] Further, in the load limiting device, a flange coupling is further included. One end of the flange coupling is connected to one end of the output shaft close to the other side inside the housing, and the other end of the flange coupling is located on the other side outside the housing.

[0015] Further, in the load limiting device, the driving component includes: a first bearing, a second bearing, a rotating shaft, a rotor, and a stator; the stator is axially arranged on one end inside the housing, the first bearing is arranged on one side inside the housing, the second bearing is arranged on the other side inside the housing, one end of the rotating shaft is movably arranged in the first bearing, the other end of the rotating shaft is movably arranged in the second bearing, and the rotor is arranged on the rotating shaft and located between the first bearing and the second bearing.

[0016] Further, in the load limiting device, the clutch includes: a clutch outer sleeve, outer friction plates, an elastic component, and inner friction plates; the output shaft is arranged inside the clutch outer sleeve, the outer friction plates are arranged inside the clutch outer sleeve and on the outer side of the output shaft, one end of the elastic component is arranged inside the output shaft and the other end is pressed against the inner friction plates, and the inner friction plates are arranged on the outer side surface of the output shaft; wherein, lubricating holes are formed in both the outer friction plates and the inner friction plates.

[0017] Further, in the load limiting device, the speed reduction component includes: a first gear, a transmission shaft, a second gear, and a third gear; the first gear is connected to one end of the rotating shaft, the transmission shaft is arranged on one side inside the housing, the second gear is arranged on the transmission shaft and meshes with the first gear, and the third gear is arranged on the outer side of the clutch outer sleeve and meshes with the second gear.

[0018] Further, in the load limiting device, a water cooling component is further included. The water cooling component includes a water inlet part, a first cooling part, and a second cooling part; a water inlet is formed in the water inlet part, a water outlet is formed in the first cooling part, the water inlet part is connected to the first cooling part, and the first cooling part is connected to the second cooling part; the first cooling part is arranged around the outside of the driving component, and the second cooling part is arranged around the outside of the clutch.

[0019] Further, in the load limiting device, a water inlet is formed between the driving component and one end inside the housing, a water outlet is formed between the clutch and the other end inside the housing, and the water inlet is communicated with the water outlet.

[0020] Further, in the load limiting device, a speed reducer housing is further included. The speed reducer housing is arranged on the outside of the housing and is used for accommodating the speed reduction component.

[0021] Further, in the load limiting device, the clutch is a wet friction clutch, and the number of both the outer friction plates and the inner friction plates is 80 pairs to 200 pairs.

[0022] Further, in the load limiting device, a first end cover and a second end cover are further included; the first end cover is connected to one side outside the housing, and the second end cover is connected to the other side outside the housing.

[0023] The technical solution adopted by the present invention has the following beneficial effects:

[0024] The load limiting device provided by the present invention includes: a housing, a driving component disposed at one end inside the housing; an output shaft disposed at the other end inside the housing and arranged parallel to the driving component; a clutch sleeved on the output shaft; a speed reducing component disposed on one side inside the housing, one end of the speed reducing component is connected to the driving component and the other end is connected to the clutch; wherein, the maximum thickness of the housing is consistent with the maximum axial dimension of the driving component; the driving component, the speed reducing component, the clutch, the output shaft and the flange coupling are connected in a U shape. The load limiting device in the embodiment of the present invention realizes the load limiting function through the clutch, and at the same time connects the driving component, the output shaft and the clutch in the same housing through the speed reducing component, and the driving component, the output shaft and the clutch are arranged in parallel, saving the axial space of the whole device, simplifying the device structure, and thus greatly reducing the volume and weight of the device, thereby greatly reducing the cost. Description of the Drawings

[0025] Figure 1 is a schematic external structure diagram of a load limiting device provided by the present invention from a first perspective;

[0026] Figure 2 is a front view of a load limiting device provided by the present invention;

[0027] Figure 3 is Figure 2 a sectional view taken along the line A-A in

[0028] Figure 4 is a schematic internal structure diagram of a load limiting device provided by the present invention;

[0029] Figure 5 is a schematic external structure diagram of a load limiting device provided by the present invention from a second perspective;

[0030] Figure 6 is a schematic external structure diagram of a load limiting device provided by the present invention from a third perspective;

[0031] Figure 7 is a schematic external structure diagram of a load limiting device provided by the present invention from a fourth perspective;

[0032] Figure 8 The front view of the clutch in a load limiting device provided by the present invention;

[0033] Figure 9 The right view of the clutch in a load limiting device provided by the present invention;

[0034] Figure 10 Is Figure 9 The sectional view taken along the B-B direction in

[0035] Figure 11 The internal structure schematic diagram of the clutch in a load limiting device provided by the present invention;

[0036] Figure 12 The exploded view of the clutch in a load limiting device provided by the present invention;

[0037] Figure 13 The internal sectional view after the explosion of the clutch in a load limiting device provided by the present invention;

[0038] Figure 14 The internal structure schematic diagram after the explosion of the clutch in a load limiting device provided by the present invention;

[0039] Figure 15 The front view of the water cooling component in a load limiting device provided by the present invention;

[0040] Figure 16 The top view of the water cooling component in a load limiting device provided by the present invention;

[0041] Figure 17 The right view of the water cooling component in a load limiting device provided by the present invention;

[0042] Figure 18 The structural schematic diagram of the water cooling component in a load limiting device provided by the present invention from the first perspective;

[0043] Figure 19 The structural schematic diagram of the water cooling component in a load limiting device provided by the present invention from the second perspective;

[0044] Figure 20 The structural schematic diagram of the water cooling component in a load limiting device provided by the present invention from the third perspective;

[0045] Figure 21 The external structural schematic diagram of the locking handle in a load limiting device provided by the present invention;

[0046] Figure 22 The left view of the locking handle in a load limiting device provided by the present invention;

[0047] Figure 23 is Figure 22 a cross-sectional view in the C-C direction in;

[0048] Figure 24 a three-dimensional internal structure view of a locking handle in a load-limiting device provided by the present invention;

[0049] Figure 25 a schematic internal structure view of a locking handle in a load-limiting device provided by the present invention;

[0050] Figure 26 is Figure 25 a cross-sectional view in the D-D direction in;

[0051] Figure 27 is Figure 25 a three-dimensional cross-sectional view in the D-D direction in;

[0052] Figure 28 a schematic structure view of a load-limiting device provided by the present invention when not installed with an external device;

[0053] Figure 29 a schematic internal structure view of a load-limiting device provided by the present invention when not installed with an external device;

[0054] Figure 30 a schematic structure view of a load-limiting device provided by the present invention after being installed with an external device;

[0055] Figure 31 a schematic internal structure view of a load-limiting device provided by the present invention after being installed with an external device.

[0056] In the figure: 100, housing; 200, driving component; 300, output shaft; 400, clutch; 500, reduction assembly; 101, flange coupling; 110, first accommodating portion; 120, second accommodating portion; 130, reduction housing; 210, first bearing; 220, second bearing; 230, rotating shaft; 240, rotor; 250, stator; 410, clutch jacket; 420, outer friction plate; 430, elastic component; 440, inner friction plate; 431, spring seat; 432, spring sheet; 4 33. Lock bolt; 434. Circlip; 435. Stopper; 510. First gear; 520. Transmission shaft; 530. Second gear; 540. Third gear; 140. First end cover; 150. Second end cover; 600. Water cooling assembly; 610. Water inlet; 620. First cooling section; 630. Second cooling section; 10. Water inlet; 20. Water outlet; 611. First circular water channel; 612. Second circular water channel; 621. First water channel; 622. Second water channel; 623. Third water channel; 624, the fourth water channel; 625, the fifth water channel; 626, the sixth water channel; 627, the seventh water channel; 628, the eighth water channel; 629, the ninth water channel; 631, the tenth water channel; 632, the eleventh water channel; 633, the twelfth water channel; 634, the thirteenth water channel; 635, the fourteenth water channel; 636, the fifteenth water channel; 637, the sixteenth water channel; 30, anti-cable bending connector; 40, plug and socket connector; 50, locking handle; 60, connection handle; 70, central junction box; 5 1. Handle body; 52. Operating lever; 53. Self-locking member; 54. Camshaft; 55. Cam sleeve; 56. Lock pin; 57. Cam; 58. Cam sliding groove; 531. Connecting rod; 532. Locking column; 541. Locking column axial sliding groove; 542. Transition sleeve; 551. Locking column moving groove; 552. Circular groove; 533. Spring; 80. Left quick release seat; 90. Right quick release seat; 81. First bayonet; 91. Second bayonet; 1. External flange; 2. External locking block; 3. Positioning shaft; 4. Inner joint. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] In the embodiments and patent claims, unless otherwise specified, "a", "an" and "the" may refer to a single or a plurality of items.

[0059] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] In the prior art, a high-frequency motor with a clutch device is used as power to replace the hydraulic power system, which can greatly reduce the volume and weight of the equipment, lower the equipment cost, and improve the equipment intelligence, and has a broad market prospect in small and medium-sized mechanical equipment.

[0061] The high-frequency motor has a high speed, light weight, and large power density. In order to achieve the same effect as the pressure-limiting overflow of the hydraulic system (for the overflow valve of the oil pressure system, when the set overflow valve value is reached, the maximum torque is limited. Often in the overflow state, the equipment reaches the maximum flow rate, maximum pressure, and maximum torque, and at this time, the system heat generation is also the largest. Without sufficient cooling, the system is prone to heat and high-temperature failure). The high-frequency motor generally adopts methods such as shear pin type clutch, jaw clutch, and friction clutch to achieve the clutch load-limiting function and prevent the impact on the equipment when the load suddenly changes. The shear pin type clutch belongs to mechanical maximum torque limitation. When the limiting torque is reached, the shear pin clutch works and the shear pin breaks. The disadvantage is that after the shear pin breaks, the torque cannot be maintained, the function of getting out of trouble with load cannot be achieved, and it cannot resume work. It needs to replace the pin before it can resume the working state. The jaw clutch is suitable for use in low-speed, weak-impact, and light-load clutches. In high-speed, heavy-load, and strong-impact states, the effect is not good, and the tooth-breaking fault is likely to occur. The conventional friction clutch is prone to locking when working in high-speed, heavy-load, and strong-impact states.

[0062] The present invention discloses a load-limiting device. Please refer to Figures 1 to 6 , including: a housing 100, a driving component 200 arranged at one end inside the housing 100, an output shaft 300 arranged at the other end inside the housing 100 and arranged parallel to the driving component 200, a clutch 400 sleeved on the output shaft 300, and a speed reduction component 500 arranged on one side inside the housing 100. One end of the speed reduction component 500 is connected to the driving component 200 and the other end is connected to the clutch 400. Wherein, the maximum thickness of the housing 100 is consistent with the maximum axial dimension of the driving component 200.

[0063] Specifically, the load limiting device further includes a flange coupling 101. One end of the flange coupling 101 is connected to one end of the output shaft 300 close to the other side inside the housing 100, and the other end of the flange coupling 101 is located on the other side outside the housing 100. The flange coupling 101 is used to connect the output shaft 300 and the load, so that the output shaft drives the load to work. Among them, the drive component 200, the speed reduction assembly 500, the clutch 400, the output shaft 300 and the flange coupling 101 are connected in a U shape.

[0064] More specifically, the housing 100 has a first accommodation part 110 and a second accommodation part 120. The first accommodation part 110 is used to accommodate the drive component 200, and the second accommodation part 120 is used to accommodate the clutch 400 and the output shaft 300. Further, the load limiting device further includes a speed reducer housing 130. The speed reducer housing 130 is provided on the outside of the housing 100 and is used to accommodate the speed reduction assembly 500. The drive component 200 is used to connect a driver (not shown in the figure) and a power source to generate power. The speed reduction assembly 500 is used to transmit power to the clutch 400. The clutch 400 is used to drive the output shaft 300 to rotate with load limiting coaxially. The output shaft 300 is used to connect the load to do work. Among them, the clutch 400 is used to separate the output shaft 300 and the speed reduction assembly 500 or engage the output shaft 300 and the speed reduction assembly 500.

[0065] In some embodiments, since the driving component 200, the output shaft 300, and the clutch 400 are arranged in parallel and connected by a speed reduction component 500, and the output shaft 300 is connected to the flange coupling 101 to connect the load, the entire load limiting device is U-shaped. Therefore, the maximum axial dimension of the driving component 200 will determine the thickness of the housing 100. At the same time, the maximum axial dimension of the clutch 400 is consistent with the thickness dimension of one side inside the housing 100. That is to say, the size of the clutch 400 can be greatly increased to be approximately the thickness of the housing 100. After the axial dimension of the clutch 400 is increased, the number of pairs of friction plates located on the clutch 400 can be greatly increased. And since the axial dimension of the clutch 400 is increased, the diameter of the friction plates can be correspondingly reduced. By adopting a U-shaped layout inside the load limiting device, the present invention greatly saves the axial space, enables the design space of the number of pairs of friction plates of the clutch 400 to have a maximum value. Among them, the design space of the clutch 400 is naturally proportional to the motor length power. The increase in the design space increases the number of pairs of friction plates of the clutch 400, and the load and pressure borne by a single pair of friction plates become smaller. Therefore, the overall axial pressure of the clutch 400 is small. The load and pressure of the friction plates are small, so the diameter of the friction plates in the clutch 400 can be designed to be small. Further, since the diameter of the friction plates is small, the linear velocity of the friction plates is also correspondingly reduced. As the speed decreases, the heat generated by a single pair of friction plates also decreases correspondingly.

[0066] Therefore, the load limiting device in the embodiment of the present invention realizes the load limiting function through the clutch 400. At the same time, the driving component 200, the output shaft 300, and the clutch 400 are connected in the same housing 100 through the speed reduction component 500. The driving component 200, the speed reduction component 500, the clutch 400, the output shaft 300, and the flange coupling 101 adopt a U-shaped layout, saving the axial space of the entire load limiting device, simplifying the device structure, and thus greatly reducing the volume and weight of the equipment, thereby greatly reducing the cost.

[0067] It is worth mentioning that in the prior art, the motor, reduction mechanism, and clutch in the conventional design are arranged in a straight line layout, resulting in an excessively long axial length of the motor. Therefore, the design space in the axial direction is small, the axial dimension of the entire device is too large, and only a small number of friction plates can be used for the clutch 400. The excessively large axial dimension causes the cost of the entire device to be too high, and the small number of friction plates simply cannot withstand high-speed and heavy-load occasions. Moreover, in high-speed or heavy-load conditions, it will also cause the phenomenon of locking due to severe heat generation. In the present invention, by adopting a U-shaped layout for the driving component 200, reduction component 500, clutch 400, output shaft 300, and the flange coupling 101, a structurally simple and compact device is formed. One end of the U-shape is for the layout of the driving component 200, the transition part of the U-shape is for the layout of the reduction component 500, and the other end of the U-shape is for the layout of the clutch 400, output shaft 300, and flange coupling 101. Compared with the straight-line layout in the prior art, the axial dimension is greatly reduced, the design space of the clutch 400 is increased, the number of friction plates of the clutch 400 is greatly increased, enabling the clutch 400 to adapt to high-speed and high-power occasions, and being able to limit the load when the load is too large and maintain the existing load state, thereby preventing the occurrence of locking.

[0068] More specifically, the driving component 200 includes: a first bearing 210, a second bearing 220, a rotating shaft 230, a rotor 240, and a stator 250; the stator 250 is axially arranged at one end inside the housing 100, the first bearing 210 is arranged on one side inside the housing 100, the second bearing 220 is arranged on the other side inside the housing 100, one end of the rotating shaft 230 is movably arranged inside the first bearing 210, the other end of the rotating shaft 230 is movably arranged inside the second bearing 220, and the rotor 240 is arranged on the rotating shaft 230 and is located between the first bearing 210 and the second bearing 220. Among them, one end of the rotating shaft 230 is used to connect to the reduction component 500 to transmit power to the clutch 400. Optionally, the driving component 200 is a high-frequency motor. The working principle of the high-frequency motor is prior art and will not be elaborated here.

[0069] Furthermore, the clutch 400 is a wet friction clutch (a wet friction clutch refers to a friction clutch 400 in which all the friction plates work immersed in oil. It is often multi-disc type. When the clutch 400 is disengaged, the friction plates slip against each other due to the presence of oil pressure between them. When engaged, by applying pressure, the oil between the friction plates is squeezed out and they can be tightly engaged to transmit torque. It has less wear, better heat dissipation, lower temperature rise, longer service life than a dry friction clutch 400, and can transmit a larger torque).

[0070] Specifically, please refer to Figures 8 to 14, the clutch 400 includes: a clutch outer sleeve 410, an outer friction plate 420, an elastic component 430, and an inner friction plate 440; the output shaft 300 is disposed within the clutch outer sleeve 410, the outer friction plate 420 is disposed within the clutch outer sleeve 410 and outside the output shaft 300, one end of the elastic component 430 is disposed within the output shaft and the other end is press-fitted with the inner friction plate 440, and the inner friction plate 440 is disposed on the outer side surface of the output shaft 300; wherein, lubrication holes (not shown in the figure) are formed on both the outer friction plate 420 and the inner friction plate 440, the outer friction plate 420 and the inner friction plate 440 are arranged alternately outside the output shaft 300 to form a friction plate group, so as to realize the engagement and disengagement of the output shaft 300 and the clutch 400, the elastic component 430 and the friction plate group form a press-fitting relationship and are used to provide pressure to the friction plate group, and the lubrication holes are used to pass lubricating oil when the clutch 400 is separated from the output shaft 300 and the outer friction plate 420 and the inner friction plate 440 start to slip, so as to reduce the friction force between the outer friction plate 420 and the inner friction plate 440.

[0071] It is worth mentioning that since one end of the elastic component 430 is disposed within the output shaft 300, elastic compensation sliding can be performed axially, and it is relatively stationary with the output shaft 300 circumferentially. Therefore, it is preferably press-fitted on the inner friction plate 440 on the press-fitting friction plate, so as to prevent wear of its press-fitting contact end face.

[0072] Wherein, the elastic component 430 includes a spring seat 431, a spring piece 432, a locking bolt 433, a snap ring 434, and a stop piece 435; the spring seat 431 is in the shape of a hollow cylinder, one end of the spring seat is disposed within the output shaft 300 and the other end is press-fitted with the inner friction plate 440, the spring piece 432 is disposed within the spring seat 431, the inner end face of one end of the locking bolt 433 abuts against the spring piece 432, and the external thread of one end of the locking bolt 433 meshes with the internal thread of the output shaft 300, so that its axial position within the output shaft 300 can be adjusted, thereby adjusting the required pressing force of the spring piece 432; the radial position of the stop piece 435 passes through the output shaft 300 and is engaged with the radial slot of the other end of the locking bolt 433, thereby restricting the circumferential movement of the thread pair of the locking bolt 433 and the output shaft 300 and further restricting the axial movement. Further, the snap ring 434 is engaged with the output shaft 300, the snap ring 434 is located outside the stop piece 435 and abuts against the stop piece 435, and the snap ring axially stops at the stop piece 435 to maintain the axial position of the stop piece 435. Thus, the relative position of the locking bolt 433 and the output shaft 300 is maintained by the locking of the stop piece 435, and the relative position of the spring piece 432 within the spring seat 431 is also locked. Therefore, the elastic stability of the entire elastic component will not be offset.

[0073] In actual use, thanks to the U-shaped layout, the axial design space of the clutch 400 is increased, and certain adjustments can be made in terms of the quantity and size of the outer friction plates 420 and the inner friction plates 440. Specifically, the number of pairs of the outer friction plates 420 and the inner friction plates 440 can be increased (compared with the existing friction plates, the quantity can be increased by dozens of times, which can be determined according to the actual usage situation). With the increase in the number of pairs of the outer friction plates 420 and the inner friction plates 440, the load borne by each pair of the outer friction plates 420 and the inner friction plates 440 is correspondingly reduced. And by designing a smaller diameter for each pair of the outer friction plates 420 and the inner friction plates 440 (the diameter of the entire clutch 400 will become smaller), the rotational speed of the clutch 400 is increased at the same linear speed. Moreover, with more pairs of the outer friction plates 420 and the inner friction plates 440, the pressure borne by each pair of the outer friction plates 420 and the inner friction plates 440 is smaller. At the same time, since both the outer friction plates 420 and the inner friction plates 440 are immersed in the oil, the heat conduction is fast and the lubrication is also fast. Optionally, the number of the outer friction plates 420 and the inner friction plates 440 is 80 pairs to 200 pairs.

[0074] It is worth mentioning that in the prior art, the number of friction plates is small, the pressure borne by a single pair of friction plates is large, and the oil film formed between the friction plates simply cannot bear the huge pressure, so the friction plates are prone to heat and seizure. However, in the present invention, due to the small pressure between the outer friction plates 420 and the inner friction plates 440, a single pair of the outer friction plates 420 and the inner friction plates 440 can be connected through an oil film. Specifically, when the clutch 400 is separated from the output shaft 300, the high-speed rotating outer friction plates 420 and inner friction plates 440 shear the lubricating oil through the lubricating holes to form an oil film between the outer friction plates 420 and the inner friction plates 440. Since the pressure between the outer friction plates 420 and the inner friction plates 440 is small, the oil film can greatly reduce the frictional force between the outer friction plates 420 and between the inner friction plates 440, and reduce the wear between the outer friction plates 420 and the inner friction plates 440.

[0075] Furthermore, by selecting a wet friction clutch, torque limitation and maintenance can be achieved both when the load-limiting device is in the low-speed or high-speed state, and it has the characteristics of static and dynamic friction states. For example, when there is no impact and within the rated load value, the output shaft 300 maintains normal torque output; when subjected to an impact force, the clutch 400 is separated from the output shaft 300 and slips. At this time, the dynamic friction only works with about 1 / 3 of the static friction force. As the working time continues, the temperature of the clutch 400 rises, the viscosity of the lubricating oil becomes lower, the lubrication condition deteriorates, and the friction coefficient increases until it returns to the level of the static friction force.

[0076] Among them, after the clutch 400 starts to slip, the driver connected to the load limiting device needs to control the driving component 200 to perform corresponding actions (such as stopping or reducing the speed, etc.). In the prior art, due to the small number of friction plates of the clutch 400, its slipping time is very short, and the requirements for the driver are particularly high. The driver needs to make a control response within an extremely short time. The slipping time of the existing clutch 400 is in milliseconds, so the driver needs to respond within microseconds. In the load limiting device of the present invention, from the start of impact slipping, generation of dynamic friction until the restoration of static friction, at this time, the clutch 400 has a time of seconds, which is sufficient for the driver to respond within the operation time. At this time, the driver can control the output speed of the driving component 200 to decrease, thereby reducing the output power, and maintaining torque output at low speed, realizing long-term torque maintenance work at low speed. When the motor in the prior art is impacted, the driver needs to make a power reduction and speed reduction response within milliseconds or even microseconds to adjust the working state of the motor. Otherwise, abnormal states such as the driver being overloaded and tripping or the motor suddenly stopping will occur. This requirement has extremely high requirements for the high-frequency frequency and quality of the driver, the cost of the driver is extremely high, and the instantaneous intervention effect of the clutch 400 cannot be achieved. The clutch 400 in the present invention first intervenes in slipping to give the driver a window feedback operation time of seconds (5-10 seconds), so that the driver will not suddenly trip due to instantaneous overload, and under the condition of maintaining constant torque, automatically calculates and reduces the speed to achieve power reduction output. At this time, if the clutch 400 continues to slip, it can reduce heat generation, which is beneficial to long-term torque maintenance at low speed and anti-lock; at the same time, it reduces the requirement for the reaction time of the driver, and greatly reduces the cost of the driver.

[0077] Further, the reduction assembly 500 includes: a first gear 510, a transmission shaft 520, a second gear 530, and a third gear 540; the first gear 510 is connected to one end of the rotating shaft 230, the transmission shaft 520 is disposed on one side inside the housing 100, the second gear 530 is disposed on the transmission shaft 520 and meshes with the first gear 510, and the third gear 540 is disposed outside the clutch outer sleeve 410 and meshes with the second gear 530. Among them, in order to minimize the axial design space, the first gear 510, the second gear 530, and the third gear 540 are located on the same circumferential straight line.

[0078] Furthermore, it further includes a first end cover 140 and a second end cover 150; the first end cover 140 is connected to one side outside the housing 100, and the second end cover 150 is connected to the other side outside the housing 100. Specifically, the first end cover 140 and the reducer housing are on the same side. Both the first end cover 140 and the second end cover 150 are detachably connected to the housing 100, making the entire load-limiting device an open and detachable design. The driving component 200, output shaft 300, clutch 400, and reduction component 500 inside the entire housing 100 are all of an open design, thereby amplifying the axial design space and facilitating the maintenance of each part in the housing 100.

[0079] Furthermore, it further includes a water cooling component 600, and the water cooling component includes a water inlet part 610, a first cooling part 620, and a second cooling part 630; a water inlet 10 is provided on the water inlet part 610, a water outlet 20 is provided on the first cooling part 620, the water inlet part 610 is connected to the first cooling part 620, and the first cooling part 620 is connected to the second cooling part 630; the first cooling part 620 is arranged around the outside of the driving component, and the second cooling part 630 is arranged around the outside of the clutch. Among them, the shape of the first cooling part 620 is adapted to the shape of the first accommodating part, and the shape of the second cooling part 630 is adapted to the shape of the second accommodating part.

[0080] In the embodiment of the present invention, please refer to Figures 15 to 20The water inlet of the water inlet part 610 is cylindrical and is connected to the first cooling part 620 through the first circular water channel 611. The first circular water channel 611 is used to cool the second end cover 150 and the bearing (not shown in the figure) of the second end cover. The second circular water channel 612 is used to cool the first end cover 140 and the bearing (not shown in the figure) on the first end cover 140. The first cooling part 620 includes a first water channel 621, a second water channel 622, a third water channel 623, a fourth water channel 624, a fifth water channel 625, a sixth water channel 626, a seventh water channel 627, an eighth water channel 628, and a ninth water channel 629. The second cooling part 630 includes a tenth water channel 631, an eleventh water channel 632, a twelfth water channel 633, a thirteenth water channel 634, a fourteenth water channel 635, a fifteenth water channel 636, and a sixteenth water channel 637. The first water channel 621 is connected to the first circular water channel 611. One end of the first water channel 621 is connected to one end of the second water channel 622. The other end of the second water channel 622 is connected to the other end of the third water channel 623. One end of the third water channel 623 is connected to one end of the fourth water channel 624. The other end of the fourth water channel 624 is connected to the other end of the fifth water channel 625. One end of the fifth water channel 625 is connected to one end of the sixth water channel 626. The other end of the sixth water channel 626 is connected to the other end of the seventh water channel 627. One end of the seventh water channel 627 is connected to one end of the second circular water channel 612. The other end of the second circular water channel 612 is connected to the other end of the eighth water channel 628. One end of the eighth water channel 628 is connected to one end of the tenth water channel 631. The other end of the tenth water channel 631 is connected to the other end of the eleventh water channel 632. One end of the eleventh water channel 632 is connected to one end of the twelfth water channel 633. The other end of the twelfth water channel 633 is connected to the other end of the thirteenth water channel 634. One end of the thirteenth water channel 634 is connected to one end of the fourteenth water channel 635. The other end of the fourteenth water channel 635 is connected to the other end of the fifteenth water channel 636. One end of the fifteenth water channel 636 is connected to one end of the sixteenth water channel 637. The other end of the sixteenth water channel 637 is connected to the other end of the ninth water channel 629. One end of the ninth water channel 629 is connected to the water outlet.

[0081] When the load limiting device is running, by injecting cooling water into the water inlet 10, the cooling water flows from the water inlet on the water inlet part 610 through the first circular water channel 611, the first water channel 621, the third water channel 623, the fourth water channel 624, the fifth water channel 625, the sixth water channel 626, the seventh water channel 627, the second circular water channel 612, the eighth water channel 628, the tenth water channel 631, the eleventh water channel 632, the twelfth water channel 633, the thirteenth water channel 634, the fourteenth water channel 635, the fifteenth water channel 636, the sixteenth water channel 637 and the ninth water channel 629 in sequence, and then flows out from the water outlet 20. In this way, the heat around the driving component 200, around the clutch 400, around the reduction assembly 500, the first end cover 140 and its bearing, and the second end cover 150 and its bearing can be dissipated, thereby ensuring that after the clutch 400 is instantly locked during high-speed load-limiting holding operation, the temperature of the clutch 400 cools down rapidly, ensuring that the clutch 400 can recover on its own after cooling.

[0082] Optionally, the load limiting device also includes: an anti-cable bending connector 30, a plug and socket connector 40, a locking handle 50, a connecting handle 60 and a central wiring box 70; the central wiring box 70 is arranged on the shell 100 and is located on the same side as the first end cover 140, and the central wiring box 70 is used to set connecting wires or drivers to perform corresponding control on the driving component 200; further, the anti-cable bending connector 30 and the plug and socket connector 40 are both connected to the shell 100 and are located on the side of the central wiring box 70, wherein the anti-cable bending connector 30 is used to prevent the cable outlet from being damaged due to excessive twisting, and the plug and socket connector 40 is used to connect an external motor (such as a tool feeding motor); the locking handle 50 is connected to one side outside the shell 100, and is used to quickly open and close the load limiting device and the external equipment; the connecting handle 60 is detachably connected to the first end cover 140 and the second end cover 150.

[0083] For more details, please refer to Figures 21 to 27, the locking handle 50 includes a handle body 51, an operating rod 52, a self-locking member 53, a camshaft 54, a cam sleeve 55, and a locking pin 56; a cam 57 is fixedly arranged on the camshaft 54, the camshaft 54 is arranged inside the cam sleeve 55, and an arc-shaped cam sliding groove 58 that is adapted to the shape of the cam 57 is formed in the circumferential direction of the cam sleeve 55; the self-locking member 53 is located at one end of the camshaft 54, a connecting rod 531 is arranged on the self-locking member 53, and a locking post 532 is arranged at the end of the connecting rod 531 away from the self-locking member 53; optionally, the connecting rod 531 and the locking post 532 are integrally connected. An axially arranged locking post axially sliding groove 541 that is adapted to the shape of the locking post 532 is formed in the axial direction of the camshaft 54, the locking post 532 is located inside the locking post axially sliding groove 541 and extends out of the cam sleeve 55, and a locking post moving groove 551 that is adapted to the shape of the locking post 532 is formed in the axial and circumferential directions of the cam sleeve 55, the locking post moving groove 551 is L-shaped, with the short side in the axial direction of the cam sleeve 55 and the long side in the circumferential direction. A spring 533 is further arranged outside the connecting rod 531, one end of the spring 533 abuts against the inner wall of the self-locking member 53, and the other end abuts against one end of the camshaft 54. A circular groove 552 is formed in the circumference of the cam sleeve 55, the operating rod 52 is connected to the middle of the outside of the cam sleeve 55, and the locking pin 56 passes through the operating rod 52 and is placed on the circular groove 552 to axially lock the operating rod 52 so that the operating rod 52 can only move circumferentially; the handle body 51 is arranged on the cam sleeve 55 and at the end away from the self-locking member 53; wherein, a transition sleeve 542 is further sleeved on one end of the camshaft 54, and the inner wall and the outer wall of the transition sleeve 542 are both regular hexagons for connecting with the operating rod 52, that is to say, the operating rod 52 and the camshaft 54 can be connected through the transition sleeve 542, and the movement of the camshaft 54 is locked circumferentially through the transition sleeve 542, but it can move axially.

[0084] In an embodiment of the present invention, when the locking handle 50 is in the locked state, the other end of the camshaft 54 is in the extended state (for example, extended by 3 mm). When unlocking is required, axially press the self-locking member 53. At this time, the spring 533 is compressed, and the connecting rod 531 pushes the locking post 532 to axially move in the axial sliding groove 541 of the locking post (move towards the end away from the self-locking member 53). When the locking post 532 is located at the connection of the long side and the short side of the locking post moving groove 551, the operating rod 52 can be rotated counterclockwise at this time. The operating rod 52 drives one end of the camshaft 54 to rotate through the transition sleeve 542, so that the locking post 532 moves circumferentially to the long side of the locking post moving groove 551 (thereby jamming the locking post 532 and making it unable to reset). At the same time, the cam 57 provided on the camshaft 54 also performs a circumferential movement on the cam sleeve 55 along the cam sliding groove 58, so that the camshaft 54 retracts, and the locking handle 50 is unlocked.

[0085] Similarly, when locking is required, rotate the operating rod 52 clockwise. Then the transition sleeve 542 drives one end of the camshaft 54 to rotate, and the locking post 532 moves to the connection of the long side and the short side of the locking post moving groove 551. Since the pressure on the spring 533 has not been released before, when the pressure on the spring 533 is released, while the spring 533 resets, it drives the locking post 532 back to the short side of the locking post moving groove 551. At the same time, the cam 57 returns to the origin, and at the same time, the other end of the camshaft 54 extends out of the cam sleeve 55 to lock; among them, when the locking post 532 returns to the short side of the locking post moving groove 551, the self-locking function of the locking handle 50 is realized. At this time, the locking handle 50 cannot be unlocked by rotating the operating rod 52, and the self-locking member 53 needs to be pressed to unlock, so as to ensure the reliability of the locking handle 50.

[0086] More specifically, by presetting an axial sliding groove 541 for the locking post on the camshaft, the axial movement of the connecting rod 531 and the camshaft does not interfere with each other, realizing circumferential stopping and axial sliding; an L-shaped locking post moving groove 551 is preset on the cam sleeve 55 to realize axial sliding and circumferential sliding; further, by presetting an arc-shaped cam sliding groove 58 and installing a spring 533 at the front end of the connecting rod 531, the connecting rod 531 is subjected to an outward elastic force relative to the camshaft. When the self-locking member 53 is pressed to unlock and the operating rod 52 is rotated counterclockwise by 90 degrees, the connecting rod 531 enters the unlocking position, the connecting rod 531 and the cam sleeve 55 are axially locked, and the locking post 532 slides circumferentially on the long side of the locking post moving groove 551. At this time, the cam 57 on the camshaft 54 slides in the cam sliding groove 58 on the cam sleeve 55 to generate a retraction displacement of 3 mm. The displacement amount left by the axial sliding groove 541 of the locking post on the camshaft 54 gives the connecting rod 531 an axial movement space, removing the axial interference between the connecting rod 531 and the locking post 532; when the operating rod 52 is rotated clockwise by 90 degrees, the cam 57 on the camshaft 54 slides in the cam sliding groove 58 on the cam sleeve 55 to generate an extension displacement of 3 mm. At the same time, the locking post 532 enters the turning point position of the locking post moving groove 551 on the cam sleeve 55 (the connection point between the long side and the short side of the locking post moving groove). The connecting rod 531 is subjected to the spring force and enters the stopping position of the axial sliding groove 541 of the locking post on the camshaft 54 and the end position of the locking post moving groove 551 on the cam sleeve 55 (the short side of the locking post moving groove). Then the locking post 532 is axially locked and circumferentially locked with the cam sleeve 55 (because the axial movement of the camshaft 54 is caused by the circumferential 90-degree movement of the cam 57 on it in the arc-shaped cam sliding groove 58 on the cam sleeve 55, resulting in the axial expansion and contraction of the camshaft 54 in the cam sleeve 55. Therefore, locking the circumferential direction locks the axial direction). At the same time, the circumferential displacement of the cam sleeve 55 and the camshaft 54 is circumferentially locked, so as to achieve the purpose of axial locking. At the same time, the axial sliding groove 541 of the locking post on the camshaft 54 removes the axial movement interference between the camshaft 54, the connecting rod 531 and the locking post 532.

[0087] Furthermore, please refer to Figures 28 to 31 together. The load limiting device further includes a left quick-release buckle seat 80 and a right quick-release buckle seat 90; the left quick-release buckle seat 80 and the right quick-release buckle seat 90 are both arranged at the bottom of the second end cover 150. A first bayonet 81 is formed in the left quick-release buckle seat 80, and a second bayonet 82 is formed in the right quick-release buckle seat 90.

[0088] In an embodiment of the present invention, the load limiting device is used to connect with an external device. The left quick-release buckle seat 80 and the right quick-release buckle seat 90 are used to engage with an external flange 1, and the locking handle 50 is used to connect with an external locking block 2. In actual use, a positioning shaft 3 is provided at the center of the external flange 1. The positioning shaft 3 is inserted into the output shaft for preliminary positioning, and then rotated by a corresponding angle so that the buckles on the left and right sides of the external flange 1 are respectively engaged into the first bayonet 81 and the second bayonet 91. The inner coupling joint 4 in the external flange 1 is adapted to the flange coupling joint 101. At the same time, the buckle on the external locking block 2 is engaged with the bayonet on the locking handle 50, so as to realize the quick installation of the external device and the limiting device. However, at this time, only the axial positioning of the load limiting device and the external device is achieved. Therefore, it is also necessary to lock the external locking block 2 through the locking handle 50, so as to perform circumferential positioning of the limiting device and the external device, and complete the locking of the load limiting device and the external device. It should be noted that since the working principle of the locking handle 50 has been described in detail above, it will not be elaborated here.

[0089] The working principle of the load limiting device in the present invention will be further described below in combination with an actual application scenario:

[0090] On the one hand, the whole load limiting device is in a U shape. Therefore, the maximum axial dimension of the driving component 200 will determine the thickness of the housing 100. At the same time, the maximum axial dimension of the clutch 400 is consistent with the thickness dimension of one side inside the housing 100. That is to say, the size of the clutch 400 can be greatly increased to be approximately the thickness of the housing 100. After the axial dimension of the clutch 400 is increased, the number of pairs of friction plates located on the clutch 400 can be greatly increased. And because the axial dimension of the clutch 400 is increased, the diameter of the friction plates can be correspondingly reduced, saving the axial space and enabling the design space of the number of pairs of friction plates of the clutch 400 to have a maximum value.

[0091] On the other hand, when the load limiting device encounters a steep load impact during operation, in order to prevent the impact on the entire device when the load suddenly changes, the clutch 400 will separate from the output shaft 300 (the output shaft 300 is jammed at this time), and the clutch 400 will slip. Previously, the clutch 400 rotated synchronously with the output shaft 300. The state between the outer friction plate 420 and the inner friction plate 440 in the clutch 400 was static friction. When the clutch 400 starts to slip, the state between the outer friction plate 420 and the inner friction plate 440 changes from static friction to dynamic friction. However, at this time, only about 1 / 3 of the frictional force during static friction is working, but the driving component 200 is still in the output state. Then, the clutch 400 keeps slipping at a high speed. The high-speed rotating outer friction plate 420 and inner friction plate 440 in the clutch 400 shear the lubricating oil through the lubricating holes to form an oil film between the outer friction plate 420 and the inner friction plate 440, thereby reducing the frictional force between the outer friction plate 420 and the inner friction plate 440. However, as time goes by, due to the continuous output of the driving component 200, the entire device, including the clutch 400, is in a heating state at this time. As the heat generation increases, the viscosity of the lubricating oil between the outer friction plate 420 and the inner friction plate 440 begins to decrease, and the lubricating condition of the lubricating oil deteriorates. Then, the dynamic friction coefficient between the outer friction plate 420 and the inner friction plate 440 gradually increases. When the dynamic friction coefficient increases, the torque of the entire clutch 400 begins to increase, and the heat generation continues to increase until the torque of the entire clutch 400 increases to the critical value (an overload trip will occur after reaching the critical value), and it changes from dynamic friction to static friction. Among them, the clutch 400 slips from static friction to dynamic friction and has a time of up to several seconds until it reaches the torque critical value. And the time of seconds is sufficient for the driver connected to the load limiting device to control the driving component 200 to execute instructions such as stopping operation or reducing the rotation speed, making the entire load limiting device easier to control.

[0092] The present invention has the following beneficial effects:

[0093] 1. The driving component 200, the output shaft 300, and the clutch 400 are arranged in parallel and are connected by a speed reduction component 500, and the output shaft 300 is connected to the flange coupling 101; the entire load limiting device is U-shaped. The U-shaped design saves axial space, and the entire load limiting device is an open design, thereby amplifying the axial design space and also facilitating the maintenance of each component.

[0094] 2. The U-shaped design enables the clutch 400 to have a design space equal in length to that of the driving component 200. The number of outer friction plates 420 and inner friction plates 440 in the clutch 400 can be selected as the maximum according to the design space. The increased design space of the clutch 400 allows for an increase in the number of outer friction plates 420 and inner friction plates 440. With a small load and axial pressure on a single pair of outer and inner friction plates 420 and 440, the diameters of the outer friction plate 420 and the inner friction plate 440 can be designed to be small. Further, a smaller diameter results in a lower linear velocity of the entire clutch 400 and a corresponding reduction in the heat generation of a single pair of friction plates. Additionally, both the outer friction plate 420 and the inner friction plate 440 are designed with multiple lubrication holes, facilitating the entry of the lubricating medium between the outer friction plate 420 and the inner friction plate 440, and ensuring good stability in the wet state of the load-limiting device.

[0095] 3. The load-limiting device can replace most of the hydraulic oil systems, with a significant reduction in volume and weight compared to hydraulic oil systems, a compact layout, and a simpler structure.

[0096] 4. The load-limiting device provides the driver with a window feedback operation time in seconds, preventing the driver from tripping suddenly due to instantaneous overload. While maintaining a constant torque, it automatically calculates and reduces the speed to achieve power reduction output. This is beneficial for maintaining torque at low speeds for a long time and preventing anti-lock braking.

[0097] 5. The driving component 200 can be replaced with a high-frequency motor, facilitating the setting of automatic program control and upgrade and transformation. Compared to the hydraulic power system, it greatly reduces the difficulty and cost of automated operation.

[0098] 6. By using a wet friction clutch, the outer friction plate 420 and the inner friction plate 440 slip against each other due to the presence of lubricating oil. After setting the pressing force, the applied pressure squeezes the oil film part between the outer friction plate 420 and the inner friction plate 440, increasing the relative resistance between the outer friction plate 420 and the inner friction plate 440 to set the transmitted torque. After calibration, it requires no maintenance, and compared to a dry friction clutch, it has less wear, better heat dissipation, lower temperature rise, and a longer service life.

[0099] 7. Through the water-cooling component 600, the driving component 200, the clutch 400, the output shaft 300, and the reduction component 500 can be water-cooled to dissipate heat in a timely manner, preventing the clutch 400 from locking up and the driving component 200 from overheating.

[0100] In summary, the present invention provides a load-limiting device, comprising: a housing, a driving component disposed at one end inside the housing; an output shaft disposed at the other end inside the housing and arranged in parallel with the driving component; a clutch sleeved on the output shaft; a speed reduction component disposed on one side inside the housing, with one end of the speed reduction component connected to the driving component and the other end connected to the clutch; a flange coupling connected to the output shaft; wherein, the maximum thickness of the housing is consistent with the maximum axial dimension of the driving component; the driving component, the speed reduction component, the clutch, the output shaft and the flange coupling are connected in a U shape. The load-limiting device in the embodiment of the present invention realizes the load-limiting function through the clutch, and at the same time connects the driving component, the output shaft and the clutch in the same housing through the speed reduction component, and the driving component, the output shaft and the clutch are arranged in parallel, saving the axial space of the whole device, simplifying the device structure, and thus greatly reducing the volume and weight of the device, thereby greatly reducing the cost.

[0101] After considering the specification and practicing the disclosed solutions herein, those skilled in the art will readily conceive of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the claims.

Claims

1. A load limiting device, comprising a housing, characterized in that, It further includes: A driving component disposed at one end within the housing; An output shaft disposed at the other end within the housing and arranged parallel to the driving component; A clutch sleeved on the output shaft; A speed reduction assembly disposed on one side within the housing, with one end of the speed reduction assembly connected to the driving component and the other end connected to the clutch; Wherein, the maximum thickness of the housing is consistent with the maximum axial dimension of the driving component; The clutch includes: a clutch outer sleeve, outer friction plates, an elastic component, and inner friction plates; the output shaft is disposed within the clutch outer sleeve, the outer friction plates are disposed within the clutch outer sleeve and outside the output shaft, one end of the elastic component is disposed within the output shaft and the other end is press-fitted with the inner friction plates, and the inner friction plates are disposed on the outer side surface of the output shaft; wherein, lubrication holes are provided on both the outer friction plates and the inner friction plates, and the lubrication holes are used to pass lubricating oil to reduce the friction between the outer friction plates and the inner friction plates when the clutch is separated from the output shaft and the outer friction plates and the inner friction plates start to slip; The outer friction plates and the inner friction plates are arranged alternately outside the output shaft to form a friction plate group; the elastic component and the friction plate group form a press-fitting relationship and are used to provide pressure to the friction plate group.

2. The load limiting device according to claim 1, wherein, The maximum axial dimension of the clutch is consistent with the thickness dimension of one side within the housing.

3. The load-limiting device according to claim 1, wherein It further includes a flange coupling, with one end of the flange coupling connected to one end of the output shaft close to the other side within the housing, and the other end of the flange coupling located on the other side outside the housing.

4. The load limiting device according to claim 1, characterized in that, The driving component includes: a first bearing, a second bearing, a rotating shaft, a rotor, and a stator; the stator is axially disposed on one end within the housing, the first bearing is disposed on one side within the housing, the second bearing is disposed on the other side within the housing, one end of the rotating shaft is movably disposed within the first bearing, the other end of the rotating shaft is movably disposed within the second bearing, and the rotor is disposed on the rotating shaft and between the first bearing and the second bearing.

5. The load limiting device according to claim 4, characterized in that, The speed reduction assembly includes: a first gear, a transmission shaft, a second gear, and a third gear; the first gear is connected to one end of the rotating shaft, the transmission shaft is disposed on one side within the housing, the second gear is disposed on the transmission shaft and meshes with the first gear, and the third gear is disposed outside the clutch outer sleeve and meshes with the second gear.

6. The load limiting device according to claim 1, characterized in that It further includes a water cooling component, and the water cooling component includes a water inlet part, a first cooling part, and a second cooling part; a water inlet is provided on the water inlet part, a water outlet is provided on the first cooling part, the water inlet part is connected to the first cooling part, and the first cooling part is connected to the second cooling part; the first cooling part is arranged to surround the outside of the driving component, and the second cooling part is arranged to surround the outside of the clutch.

7. The load-limiting device according to claim 1, characterized in that, It further includes a speed reducer housing, and the speed reducer housing is disposed outside the housing and is used to accommodate the speed reduction assembly.

8. The load-limiting device according to claim 3, wherein, The clutch is a wet friction clutch, and the number of both the outer friction plates and the inner friction plates is from 80 pairs to 200 pairs.

9. The load limiting device according to claim 1, wherein, It further includes a first end cover and a second end cover; the first end cover is connected to one side outside the housing, and the second end cover is connected to the other side outside the housing.

Images