Clutch type trailer jack

Abstract

The utility model relates to a clutch type trailer jack, which relates to the field of lifting devices and comprises a telescopic mechanism used for controlling a frame to ascend and descend, an electric structure used for providing power, a manual structure used for manual driving, a speed change mechanism used for controlling output torque and a clutch mechanism used for controlling power transmission. Wherein the clutch mechanism is arranged between the speed change mechanism and the telescopic mechanism, and the clutch mechanism is used for controlling connection or disconnection of power transmission of the speed change mechanism and the telescopic mechanism. When the manual structure drives the telescopic mechanism to control the frame to be lifted, the clutch mechanism interrupts power transmission, so that the manual structure cannot reversely drive the speed change mechanism and the electric structure to act, manpower is saved, meanwhile, abrasion between parts can be reduced, and the service life of the parts is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lifting device especially is clutch type trailer jack. BACKGROUND

[0002] The trailer jack is a lifting and supporting device, which is used for supporting vertically between the trailer frame and the ground when the trailer is separated from the towing vehicle, so as to maintain the parking stability of the trailer. The existing trailer jack usually adopts a telescopic mechanism to adjust the supporting height of the trailer.

[0003] At present, the Chinese patent application with publication number CN118372780A and publication date July 23, 2024 proposes a motor home parking device, which includes a motor and a lifting device. The motor transmits power to the lead screw in the lifting device through a reducer. The reducer includes a first-stage reduction unit, a second-stage reduction unit, and a third-stage reduction unit that transmits power to the lead screw connecting shaft.

[0004] In use, when electrically driven, the power of the motor is transmitted to the lead screw in the lifting device through the third-stage reduction in the reducer. When the lead screw rotates, it cooperates with the nut in the lifting device to produce upward or downward linear displacement, achieving lifting. When manually driven, the lead screw connecting shaft is rotated by a wrench, driving the lead screw to rotate and achieve lifting.

[0005] For the above-mentioned related technology, when manually driven, the wrench drives the lead screw to rotate, which also drives the third-stage reduction unit, the second-stage reduction unit, the first-stage reduction unit, and the motor rotor in the reducer to act. The redundant action not only consumes the labor of the operator, but also increases the wear of the parts and shortens the service life of the parts. INVENTION CONTENTS

[0006] In order to reduce the redundant action when manually driving the trailer jack to lift and reduce the labor consumption of personnel, the utility model provides a clutch type trailer jack.

[0007] The utility model provides a clutch type trailer jack, adopts the following technical scheme:

[0008] The clutch type trailer jack includes a telescopic mechanism, an electric structure, a speed change mechanism, and a manual structure. The electric structure is in transmission connection with the speed change mechanism. The speed change mechanism is in transmission connection with the telescopic mechanism. A clutch mechanism is further arranged between the speed change mechanism and the telescopic mechanism. The clutch mechanism is used to control the interruption or connection of power transmission between the speed change mechanism and the telescopic mechanism. The manual structure is arranged on the telescopic mechanism and is in transmission connection with the telescopic mechanism.

[0009] By adopting the above technical scheme, the telescopic mechanism is fixedly connected with the vehicle frame, and is driven to extend or shorten to drive the vehicle frame to lift or fall; when the electric structure is driven, the clutch mechanism is connected, the electric structure drives the speed change mechanism to work, the speed change mechanism converts and adjusts the power transmitted by the electric structure, the speed change mechanism transmits the power after conversion to the clutch mechanism, and the clutch mechanism further transmits the power to the telescopic mechanism to drive the vehicle frame to lift or fall; when the manual driving is adopted, the clutch mechanism is disconnected, and the telescopic mechanism is driven to extend or shorten by the manual structure, so that the vehicle frame can be driven to lift or fall; at this time, the clutch mechanism is disconnected, and the power of the manual structure cannot be transmitted to the speed change mechanism and the electric structure.

[0010] In this way, the clutch mechanism can be connected when the electric structure is used as the power, so that the power of the electric structure is transmitted to the telescopic mechanism to drive the vehicle frame to lift or fall; when the manual driving is used, the clutch mechanism is disconnected, so that the manual structure cannot drive the speed change mechanism and the electric structure in reverse, thereby reducing the redundant action of the outer supporting member during lifting or falling when the manual driving is used, reducing the labor consumption during manual driving, reducing the wear of the speed change mechanism, the electric structure and other parts during working, and prolonging the service life of the parts.

[0011] Optionally, the telescopic mechanism is internally provided with a lead screw, and the telescopic mechanism is driven by the lead screw; the clutch mechanism comprises a first driving shaft connected with the speed change mechanism, a first block slidingly arranged on the first driving shaft, and a second block rotationally arranged on the telescopic mechanism, the second block is in transmission connection with the lead screw; when the first block slides to one end close to the second block, the first block is embedded and in transmission connection with the second block; when the first block slides to one end away from the second block, the first block is separated from the second block.

[0012] By adopting the above technical scheme, the telescopic mechanism is driven to extend or shorten by the lead screw; when the electric structure is driven, the clutch mechanism is connected, the speed change mechanism transmits the power after conversion to the first block, the first block and the second block are embedded, the first block transmits the power to the second block, the second block is in transmission connection with the lead screw, so that the electric structure can transmit the power to the lead screw to drive the vehicle frame to lift or fall.

[0013] When the manual driving is adopted, the lead screw is driven to rotate by the manual structure, so that the vehicle frame can be driven to lift or fall; the first block is slid away from the second block, so that the first block and the second block are separated; when the handle drives the lead screw to rotate, only the second block in transmission connection with the lead screw can be driven to rotate, and the power cannot be transmitted to the first block, the speed change mechanism and the electric structure in transmission connection with the first block. In this way, the first block in the clutch mechanism can be moved to control the connection or interruption of the clutch mechanism.

[0014] Optionally, the end of the first driving shaft close to the second block is provided with a guide groove, the guide groove is arranged along the axial direction of the first driving shaft, the first block is provided with a circular mounting hole in the middle, the first driving shaft is arranged in the mounting hole, the inner circumferential surface of the mounting hole is provided with a guide block, the guide block is slidingly arranged in the guide groove, and the guide block and the guide groove are used for limiting the first block and the first driving shaft in the circumferential direction.

[0015] Since the first block needs to slide along the axial direction of the first driving shaft and can transmit the power on the first driving shaft to the second block through the first block, by adopting the above technical scheme, the mounting hole of the first block is sleeved on the first driving shaft during installation, the guide block on the first block is corresponded with the guide groove on the first driving shaft, the guide block is embedded in the guide groove, when the first driving shaft rotates, the first driving shaft transmits the torque to the guide block of the first block through the guide groove, and then the first driving shaft can drive the first block to rotate; the first block slides along the guide groove towards the direction close to the second block, and after the first block is embedded with the second block, the first block can transmit the power of the first driving shaft to the second block; the first block slides along the guide groove towards the direction away from the second block, and the power transmission can be interrupted after the first block is separated from the second block.

[0016] In this way, the cooperation of the guide groove and the guide block can not only limit the sliding of the first block on the first driving shaft, but also stably transmit the torque, reduce the swing of the first driving shaft when driving the first block to rotate, and increase the stability in the rotating process.

[0017] Optionally, the first driving shaft is in a cylindrical structure, the end of the first driving shaft close to the second block is provided with a limiting section, the diameter of the limiting section is greater than the diameter of the first driving shaft, and the guide groove is arranged on the limiting section; when the guide block slides away from the second block, the guide block slides out of the guide groove and is sleeved on the first driving shaft.

[0018] By adopting the technical scheme, the guide block on the first insert block corresponds to the guide groove on the limiting section, the first insert block is slid along the axial direction of the first driving shaft towards the limiting section, the guide block is inserted into the guide groove, the power of the first driving shaft is transmitted to the first insert block, the first insert block is slid along the axial direction of the first driving shaft away from the limiting section, the guide block is slid out of the guide groove, the first insert block is rotated on the cylindrical structure of the first driving shaft, the first driving shaft cannot transmit power to the first insert block, the position of the guide block is rotated to a position deviated from the guide groove, the guide block abuts against the limiting section, the first insert block is axially limited, the first insert block is prevented from sliding towards the second insert block, and the disengagement state of the first insert block and the second insert block is maintained.

[0019] Optionally, the clutching mechanism further comprises a collar and a spring, the collar is fixedly arranged on the outer circumferential surface of the first driving shaft, the spring is sleeved on the first driving shaft, and the spring is pre-tightened between the collar and the first insert block, the first insert block is arranged on the side of the collar facing the second insert block, and the spring is used for pressing the first insert block against the second insert block.

[0020] By adopting the technical scheme, one end of the spring abuts against the collar, the other end of the spring abuts against the second insert block, the spring can press the first insert block against the second insert block, the first insert block and the second insert block are difficult to disengage when the clutching mechanism transmits power, the spring is sleeved on the outer circumferential surface of the first driving shaft, the elastic force of the spring can be uniformly transmitted to the first insert block, and the stability of the spring and the first insert block during rotation of the first driving shaft and the first insert block is improved.

[0021] Optionally, a plurality of insert teeth are arranged at intervals on the end face of the first insert block facing the second insert block, and an insert groove is formed between adjacent insert teeth; a plurality of adjacent insert teeth are arranged on the end face of the second insert block facing the first insert block, and an insert groove is formed between adjacent insert teeth; when the first insert block and the second insert block are embedded, the insert teeth are embedded in the insert grooves for transmission.

[0022] By adopting the technical scheme, the insert teeth and the insert grooves are arranged on the first insert block and the second insert block respectively, when the first insert block and the second insert block are embedded, the insert teeth are embedded in the corresponding insert grooves to realize the embedding of the first insert block and the second insert block, the side walls of the insert teeth and the side walls of the insert grooves abut against each other to transmit the torque during rotation of the first insert block, realize the transmission of the first insert block and the second insert block, the first insert block is slid away from the second insert block to disengage the insert teeth from the insert grooves, and interrupt the transmission of the clutching mechanism. The embedding and disengagement of the first insert block and the second insert block are realized by the insert teeth and the insert grooves, and the structure is simple and reliable.

[0023] Optionally, the telescopic mechanism further comprises an outer support, an inner support and a nut fixed on the inner support, the screw rod is in threaded connection with the nut, the outer support is sleeved outside the inner support, the outer support is used for connecting a vehicle frame, the screw rod is in transmission connection with the gear shifting mechanism; the outer support is further provided with a support assembly, the support assembly comprises a support seat fixed on the outer support, a limiting plate provided on the outer support, and a thrust bearing provided between the support seat and the limiting plate, the limiting plate is arranged below the support seat, the screw rod is further provided with a support ring fixed thereon, the screw rod is arranged in a through hole in the middle of the thrust bearing, and the thrust bearing is provided with two thrust bearings which are respectively arranged on the two sides of the support ring for axial limiting.

[0024] By adopting the above technical scheme, when the screw rod rotates, the support ring rotates with the screw rod between the support seat and the limiting plate, and the two thrust bearings rotate to support the support ring at the two ends of the support ring, so that the screw rod and the support seat are rotationally connected; the support seat is fixed on the outer support, so that the screw rod and the outer support are rotationally connected; when the screw rod rotates, the screw rod is in threaded connection with the nut fixed on the inner support, so that the screw rod can be elongated or shortened relative to the outer support, the screw rod is rotationally connected with the outer support, and the outer support is fixed on the vehicle frame, so that the outer support can be extended or shortened relative to the inner support when the screw rod rotates, and the outer support and the inner support can drive the vehicle frame to be lifted or lowered; the thrust bearing reduces the rotational friction between the screw rod and the connecting seat.

[0025] Optionally, the transmission mechanism comprises a transmission shaft rotationally arranged on the support seat, a driving bevel gear fixed on the transmission shaft and a driven bevel gear fixed on the end of the screw rod, the driving bevel gear and the driven bevel gear are in engagement; the second block is fixed on the end of the transmission shaft close to the first block, and the second block is coaxially arranged with the transmission shaft.

[0026] By adopting the above technical scheme, when the second block rotates, the transmission shaft can be driven to rotate, the transmission shaft transmits power to the driving bevel gear, the driving bevel gear and the driven bevel gear are in engagement, so that the driving bevel gear can drive the driven bevel gear to rotate, the driven bevel gear is fixed on the end of the screw rod, and thus the second block can drive the screw rod to rotate. In this way, the second block and the screw rod are in transmission connection through the bevel gears, the direction of power transmission can be changed, the electric structure can be fixed on the side of the screw rod, the space occupied by the trailer jack in the length direction is reduced, and the trailer jack is convenient to store; and the bevel gears can bear a large load and provide sufficient torque for the screw rod, so that the telescopic mechanism can stably lift the vehicle frame.

[0027] Optionally, the variable speed mechanism is fixedly connected to the telescopic mechanism, an input shaft of the variable speed mechanism is in transmission connection with an output shaft of the electric structure, and an output end of the variable speed mechanism is in transmission connection with the clutch mechanism, and the variable speed mechanism is used for adjusting the rotation speed and torque output by the electric structure.

[0028] The telescopic mechanism needs to bear the weight of the vehicle frame when lifting the vehicle frame, so the power output by the electric structure needs to be converted by the variable speed mechanism to provide sufficient power for lifting the vehicle frame.

[0029] Optionally, the manual structure is a spline shaft structure integrally arranged at the top of the screw rod, or the manual structure is a second driving shaft, the second driving shaft is in rotary connection with the telescopic mechanism, one end of the second driving shaft is in transmission connection with the screw rod, and the other end of the second driving shaft is a spline shaft structure and is arranged outside the telescopic mechanism.

[0030] By adopting the above technical scheme, the manual structure is arranged as a spline structure, so that when the handle drives the screw rod to rotate, the manual structure can more stably transmit torque and stably lift the vehicle frame.

[0031] When the mounting space at the top of the telescopic mechanism is insufficient to connect the handle, the second driving shaft can be arranged to provide power on the side of the screw rod, change the transmission direction of the power, and facilitate the operator to manually drive the screw rod to rotate by cooperating the handle and the manual structure on the side.

[0032] In summary, the utility model has at least one of the following beneficial technical effects:

[0033] By arranging the clutch mechanism on the trailer jack, when the telescopic mechanism is driven by the electric structure to lift or lower the vehicle frame, the clutch mechanism is connected, so that the electric structure can drive the telescopic mechanism to work; when the telescopic mechanism is manually driven to lift or lower the vehicle frame, the clutch mechanism is disconnected, so that the manually driven telescopic mechanism cannot reversely transmit motion to the electric structure and the variable speed mechanism, thereby reducing the labor required when manually driving and saving manpower; at the same time, the motion of the electric structure and the variable speed mechanism can be reduced, the wear of parts can be reduced, and the service life of the parts can be prolonged.

[0034] The clutch mechanism is provided with coaxially arranged first and second blocks, the second block is rotationally arranged on the telescopic mechanism, the first block is slidingly arranged on the telescopic mechanism, the first block is in transmission connection with the first driving shaft of the transmission mechanism, and the first driving shaft is further provided with a limiting structure for limiting the sliding position of the first block, so that the first block and the second block can be engaged to transmit power, and the first block and the second block can be separated to interrupt the transmission of power, and the limiting structure further increases the stability of the first block when sliding and transmitting power.

[0035] The bevel gear is used as the transmission mechanism, the installation position of the transmission mechanism relative to the telescopic mechanism can be flexibly adjusted through the transmission structure of the bevel gear, so that the transmission mechanism can be installed on the side of the telescopic mechanism when the vertical space of the telescopic mechanism is insufficient, and the transmission mechanism can be installed above the telescopic mechanism when the installation space on the side of the telescopic mechanism is insufficient, thereby improving the flexibility of the installation position of the overall structure and facilitating use. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of the overall structure of example 1;

[0037] Figure 2 is a schematic diagram of the installation position of the clutch structure of example 1;

[0038] Figure 3 is a schematic diagram of the internal structure of the telescopic mechanism of example 1;

[0039] Figure 4 is a schematic diagram of the A-A cross-sectional view of Figure 1

[0040] Figure 5 is a schematic diagram of the connection relationship between the clutch mechanism and the transmission mechanism of example 1;

[0041] Figure 6 is a schematic diagram of the disengagement state of the first block and the first driving shaft of example 1;

[0042] Figure 7 is a schematic diagram of the engagement state of the first block and the first driving shaft of example 1;

[0043] Figure 8 is another perspective view of the structure in Figure 7

[0044] Figure 9 is a schematic diagram of the first driving shaft structure of example 1;

[0045] Figure 10 is a schematic diagram of the first block structure of example 1;

[0046] Figure 11 is a schematic diagram of the second block structure of example 1;​​

[0047] Figure 12 is a manual structure installation schematic diagram of example 2;

[0048] Figure 13 is a variable speed structure and clutch mechanism installation position schematic diagram of example 3.

[0049] BRIEF DESCRIPTION OF DRAWINGS: 100, telescopic mechanism; 110, inner support; 120, nut; 130, screw rod; 131, support ring; 132, manual structure; 140, outer support; 141, mounting port; 150, support assembly; 151, support seat; 152, limiting plate; 153, thrust bearing; 160, second driving shaft; 170, driving bevel gear; 200, electric structure; 300, variable speed mechanism; 310, box body; 320, input shaft; 330, variable speed assembly; 340, first driving shaft; 341, limiting section; 342, guide groove; 343, shaft ring; 400, clutch mechanism; 410, first embedding block; 411, mounting hole; 412, guide block; 413, limiting hole; 414, embedding tooth; 415, embedding groove; 420, second embedding block; 430, spring; 500, transmission mechanism; 510, transmission shaft; 520, transmission assembly; 521, driving bevel gear; 522, driven bevel gear; 600, connecting frame. DETAILED DESCRIPTION

[0050] The following will be described in detail in combination with Figure 1 Figure 13 The utility model will be described in further detail.

[0051] Example 1: the utility model discloses a clutch type trailer jack. Refer to Figures 1 to 3 , the clutch type trailer jack mainly includes telescopic mechanism 100, transmission mechanism 500, variable speed mechanism 300 and electric structure 200, wherein the telescopic mechanism 100 is connected with the frame and is used to drive the frame to lift or fall, transmission mechanism 500, variable speed mechanism 300 and electric structure 200 are all fixedly installed on the outer support 140, electric structure 200 is used to provide power, variable speed mechanism 300 is in transmission connection with electric structure 200 and adjusts the power output of electric structure 200, so that the power output of electric structure 200 can drive telescopic mechanism 100 to drive the frame to lift or fall, and clutch mechanism 400 is arranged between variable speed mechanism 300 and outer support 140, and is used to control the on-off of power transmission of variable speed mechanism 300 and telescopic mechanism 100.

[0052] Refer to Figure 2 , the telescopic mechanism 100 includes inner support 110, nut 120, screw rod 130 and outer support 140.

[0053] The inner support 110 is in a cylindrical shape and vertically arranged, and the lower end of the inner support 110 is supported on the ground through a guide wheel or a base plate; the nut 120 is arranged on the inner wall of the upper end of the inner support 110; the lead screw 130 is threadedly connected with the nut 120, and the lead screw 130 can be extended or retracted relative to the inner support 110 by rotating; the outer support 140 is connected with the frame of the trailer through the outer wall of the outer support 140, the outer support 140 is sleeved outside the inner support 110, and the outer support 140 is rotatably connected with the lead screw 130 through the support assembly 150 and moves along the axial direction of the lead screw 130.

[0054] With reference to Figure 3 The support assembly 150 includes a support seat 151, a limiting plate 152 and two thrust bearings 153, the support seat 151 and the limiting plate 152 are respectively fixed on the outer support 140, the support ring 131 is integrally arranged at the upper end of the lead screw 130, the support ring 131 is arranged between the support seat 151 and the limiting plate 152, and the two thrust bearings 153 are respectively arranged on the upper side and the lower side of the support ring 131, one of the two thrust bearings 153 is arranged between the support seat 151 and the support ring 131, and the other thrust bearing 153 is arranged between the limiting plate 152 and the support ring 131, and the support seat 151 and the limiting plate 152 clamp the two thrust bearings 153 to axially limit the support ring 131.

[0055] Specifically, the mounting port 141 is arranged on the side wall of the outer support 140, the limiting plate 152 is horizontally inserted into the outer support 140 through the mounting port 141 and is fixed on the outer support 140, and the limiting plate 152 is further provided with a through hole; the support seat 151 includes a horizontal plate and vertical plates bent downward at both ends of the horizontal plate, and the horizontal plate of the support seat 151 is provided with a through hole; during assembly, first, one of the two thrust bearings 153 is sleeved on the bottom of the lead screw 130, second, the bottom of the lead screw 130 is inserted into the top of the outer support 140 and passes through the through hole of the limiting plate 152 until the support ring 131 is pressed against the limiting plate 152, third, the other thrust bearing 153 is sleeved on the top of the lead screw 130, and the support seat 151 is sleeved on the lead screw 130 through the through hole, and finally, the vertical plates of the support seat 151 are connected and fixed with the outer support 140 through screws, so that the rotary connection between the outer support 140 and the lead screw 130 is completed.

[0056] With reference to Figure 2 In the embodiment, the electric structure 200 is an electric motor, and the electric motor is fixedly installed on the speed change mechanism 300 through screws.

[0057] With reference to Figure 4The transmission mechanism 300 comprises a box body 310, an input shaft 320, a transmission assembly 330 and a first driving shaft 340. The box body 310 is assembled on the side wall of the outer support 140 through the connecting frame 600 on one side, and the electric structure 200 is assembled on the other side of the box body 310. The input shaft 320 of the box body 310 is connected with the rotating shaft of the electric structure 200. The transmission assembly 330 is arranged in the box body 310, and the transmission assembly 330 transmits power from the input shaft 320 to the first driving shaft 340.

[0058] In the embodiment, in order to reduce the space occupied by the electric structure 200, the electric structure 200 and the connecting frame 600 are arranged on the same side of the box body 310, and the electric structure 200 and the connecting frame 600 are respectively fixedly arranged at two ends of the box body 310.

[0059] In the embodiment, the transmission assembly 330 adopts a straight-tooth gear set for two-stage speed reduction. In other embodiments, the transmission assembly 330 can be any one of existing transmission driving modes, such as a worm gear transmission, a cycloid pin wheel transmission and other conventional transmission structures.

[0060] With reference to Figures 5 to 8 The first driving shaft 340 of the transmission mechanism 300 is connected with the transmission mechanism 500 through the clutch mechanism 400. The clutch mechanism 400 comprises a first embedding block 410, a second embedding block 420 and a spring 430. The first embedding block 410 is in a cylindrical structure, and a coaxial mounting hole 411 is formed in the middle of the cylindrical structure. A guide block 412 is arranged on the inner periphery of the mounting hole 411. The first driving shaft 340 is in a cylindrical structure. A limiting section 341 is arranged at the end of the first driving shaft 340 away from the transmission mechanism 300. The limiting section 341 is also in a cylindrical structure, and the diameter of the limiting section 341 is greater than that of the first driving shaft 340. A guide groove 342 is formed on the outer periphery of the limiting section 341. The depth of the guide groove 342 is less than the difference between the radius of the limiting section 341 and the radius of the first driving shaft 340. The guide groove 342 and the guide block 412 are arranged in a matched mode, and both the guide groove 342 and the guide block 412 extend along the axial direction of the first driving shaft 340. The first embedding block 410 is sleeved on the first driving shaft 340 through the mounting hole 411, and the guide block 412 is arranged in the guide groove 342 in a sliding mode. The matched structure of the guide block 412 and the guide groove 342 enables the first embedding block 410 to rotate with the first driving shaft 340 and slide along the axial direction of the first driving shaft 340.

[0061] With reference to Figures 9 to 11The first driving shaft 340 is provided with a shaft ring 343, the shaft ring 343 is arranged between the limiting section 341 and the speed change mechanism 300, a circular limiting hole 413 is formed in an end face of the first embedding block 410 facing the speed change mechanism 300, the spring 430 is sleeved on the first driving shaft 340, and one end of the spring 430 abuts against the shaft ring 343 of the first driving shaft 340, and the other end of the spring 430 abuts against the limiting hole 413 of the first embedding block 410; the second embedding block 420 is coaxially arranged with the first embedding block 410 and is embedded with the first embedding block 410, and the end face of the second embedding block 420 away from the first embedding block 410 is fixedly provided with a transmission shaft 510, and the support seat 151 is fixedly provided with a connecting plate at one end close to the first embedding block 410, the connecting plate is provided with a bearing seat coaxial with the first embedding block 410, and the transmission shaft 510 is rotatably arranged on the connecting seat through the bearing seat.

[0062] In the embodiment, a plurality of embedding teeth 414 are uniformly arranged in a ring shape on the opposite end faces of the first embedding block 410 and the second embedding block 420, and a groove is formed between adjacent embedding teeth 414 to form an embedding groove 415, the embedding tooth 414 and the embedding groove 415 of the first embedding block 410 are embedded with the corresponding embedding groove 415 and embedding tooth 414 of the second embedding block 420, respectively, to realize torque transmission of the first embedding block 410 and the second embedding block 420.

[0063] In other embodiments, the first embedding block 410 and the second embedding block 420 can also be designed in a square shaft-square hole, spline shaft-spline sleeve and other modes to cooperate, so that the first embedding block 410 and the second embedding block 420 can meet the requirements of both torque transmission and axial disassembly and assembly.

[0064] When the electric driving structure 200 is used for driving, the spring 430 presses the first embedding block 410 against the second embedding block 420, thereby improving the transmission reliability of the first embedding block 410 when embedded with the second embedding block 420; when manually driven, the operator first manually moves the first embedding block 410 away from the second embedding block 420, the spring 430 is compressed, the first embedding block 410 is separated from the second embedding block 420, and the guide block 412 slides out of the guide groove 342, and then the first embedding block 410 is rotated, so that the end face of the guide block 412 facing the second embedding block 420 abuts against the end face of the limiting section 341 facing the speed change mechanism 300, at this time, the first embedding block 410 and the second embedding block 420 are kept separated, and the transmission path between the electric driving structure 200, the transmission mechanism 500 and the lead screw 130 can be cut off.

[0065] Referring to Figure 5The transmission mechanism 500 comprises a transmission shaft 510 and a transmission assembly 520, the transmission assembly 520 can be any one of belt transmission, chain transmission, gear transmission or worm transmission, in the embodiment, the transmission assembly 520 comprises a driving bevel gear 521 and a driven bevel gear 522, wherein the driving bevel gear 521 is fixedly arranged at one end of the transmission shaft 510 close to the lead screw 130, the driven bevel gear 522 is fixedly arranged at the end of the lead screw 130 extending above the support seat 151, and the driving bevel gear 521 is coaxially arranged with the transmission shaft 510, the driven bevel gear 522 is coaxially arranged with the lead screw 130, and the driving bevel gear 521 is engaged with the driven bevel gear 522, so that the power of the second block 420 can be transmitted to the lead screw 130.

[0066] In order to reduce the connection between parts and save space, the transmission shaft 510 and the second block 420 are arranged in an integrated structure in the embodiment, and the input shaft 320 of the speed change mechanism 300 and the rotating shaft of the electric structure 200 are arranged in an integrated structure.

[0067] With reference to Figure 5 The upper end of the lead screw 130 is further fixedly provided with a manual structure 132, the manual structure 132 is arranged above the driven gear 522, the manual structure 132 is a square shaft structure and is coaxially arranged with the lead screw 130, the manual structure 132 is used for cooperating with a handle with a square hole structure, and the lead screw 130 is driven by manually rotating the handle, so that the outer support 140 is adjusted to adjust the lifting height of the vehicle frame.

[0068] The implementation principle of the clutch type trailer jack in the embodiment of the utility model is as follows: when the electric structure 200 is driven, the clutch mechanism 400 is connected, the power output by the electric structure 200 is sequentially transmitted to the telescopic mechanism 100 through the speed change mechanism 300, the clutch mechanism 400 and the transmission mechanism 500, so that the electric structure 200 drives the lead screw 130 to rotate on the nut 120, the rotation of the lead screw 130 makes the lead screw 130 extend or retract relative to the inner support 110, and then the outer support 140 connected with the lead screw 130 drives the vehicle frame to lift; when manually driven, the first block 410 of the clutch mechanism 400 is actuated, so that the first block 410 slides away from the second block 420, the first block 410 is separated from the second block 420, the clutch mechanism 400 is disconnected, the transmission path between the speed change mechanism 300 and the lead screw 130 is interrupted, and the lead screw 130 is rotated by using the handle, so that the height of the trailer frame can be adjusted without driving the electric structure 200 and the speed change mechanism 300.

[0069] Embodiment 2: with reference to Figure 12In the embodiment 1, when the top of the trailer jack is not provided with a handle operation space, the manual structure 132 is provided with a second driving shaft 160, which is similar to the transmission shaft 510 in the embodiment, and the second driving shaft 160 is rotatably connected to the support seat 151 through a bearing seat. A driving bevel gear 170 is arranged at one end of the second driving shaft 160 close to the lead screw 130, and the driving bevel gear 170 is engaged with the driven bevel gear 522 to realize power transmission. The other end of the second driving shaft 160 is a square shaft structure, which is used for cooperating with a handle with a square hole structure.

[0070] In the embodiment 1, the installation positions of the electric structure 200 and the speed change mechanism 300 are limited by the insufficient space above the lead screw 130, and thus the electric structure 200 and the speed change mechanism 300 are assembled on one side of the telescopic mechanism 100.

[0071] With reference to Figure 13 In the embodiment, when the space above the lead screw 130 meets the installation requirement, the electric structure 200 or / and the speed change mechanism 300 can be directly connected with the lead screw 130. At this time, the transmission assembly 520 in the embodiment 1 is omitted, the lead screw 130 is fixedly arranged with the transmission shaft 510, and the lead screw 130, the transmission shaft 510 and the first driving shaft 340 are coaxial. When the clutch mechanism 400 is connected, the transmission shaft 510 directly transmits power to the lead screw 130.

[0072] Considering that the space above the lead screw 130 is occupied by the electric structure 200 or the speed change mechanism 300, the manual driving of the lead screw 130 can only be realized in the manner in the embodiment 2.

[0073] In summary, the clutch mechanism 400 is arranged on the trailer jack in the application. When the electric telescopic mechanism 100 is used to drive the lifting or lowering of the vehicle frame, the clutch mechanism 400 is connected to enable the electric structure 200 to drive the telescopic mechanism 100 to work. When the manual telescopic mechanism 100 is used to drive the lifting or lowering of the vehicle frame, the clutch mechanism 400 is disconnected, so that the manual telescopic mechanism 100 cannot reversely transmit motion to the electric structure 200 and the speed change mechanism 300 which are in transmission connection with the electric structure 200, thereby reducing the labor required in manual driving and saving manpower. At the same time, the motion of the electric structure 200 and the speed change mechanism 300 is reduced, the wear of the parts is reduced, and the service life of the parts is prolonged.

[0074] The above are preferred embodiments of the application, which do not limit the protection scope of the application. Any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A clutch type trailer jack, comprising a telescopic mechanism (100), an electric structure (200), a gear shifting mechanism (300) and a manual structure (132), the electric structure (200) is in driving connection with the gear shifting mechanism (300), the gear shifting mechanism (300) is in driving connection with the telescopic mechanism (100), characterized in that: a clutch mechanism (400) is further arranged between the gear shifting mechanism (300) and the telescopic mechanism (100), the clutch mechanism (400) is used for controlling the interruption or connection of power transmission between the gear shifting mechanism (300) and the telescopic mechanism (100); the manual structure (132) is arranged on the telescopic mechanism (100), and the manual structure (132) is in driving connection with the telescopic mechanism (100).

2. The clutch type trailer jack according to claim 1, characterized in that: a lead screw (130) is arranged inside the telescopic mechanism (100), and the telescopic mechanism (100) is driven by the lead screw (130); the clutch mechanism (400) comprises a first driving shaft (340) connected with the gear shifting mechanism (300), a first block (410) slidingly arranged on the first driving shaft (340) and a second block (420) rotationally arranged on the telescopic mechanism (100), the second block (420) is in driving connection with the lead screw (130); when the first block (410) slides to one end close to the second block (420), the first block (410) is embedded and in driving connection with the second block (420), and when the first block (410) slides to one end away from the second block (420), the first block (410) is separated from the second block (420). The end portion of the first driving shaft (340) close to the second block (420) is provided with a guide groove (342) arranged along the axial direction of the first driving shaft (340), a circular mounting hole (411) is formed in the middle portion of the first block (410), the first driving shaft (340) is arranged in the mounting hole (411), a guide block (412) is arranged on the inner circumferential surface of the mounting hole (411), the guide block (412) is slidingly arranged in the guide groove (342), and the guide block (412) and the guide groove (342) are used for circumferentially limiting the first block (410) and the first driving shaft (340). The first driving shaft (340) is in a cylindrical structure, the end portion of the first driving shaft (340) close to the second block (420) is provided with a limiting section (341), the diameter of the limiting section (341) is greater than the diameter of the first driving shaft (340), and the guide groove (342) is formed on the limiting section (341). When the guide block (412) slides away from the second block (420), the guide block (412) slides out of the guide groove (342) and is sleeved on the first driving shaft (340). ​ ​ 3. A hitch-type trailer jack as claimed in claim 2, wherein: ​ 4. The on-off trailer jack of claim 3 wherein: ​ ​ 5. A hitch-type trailer jack as defined in claim 4, wherein: The clutch mechanism (400) further comprises a collar (343) fixedly arranged on the outer circumferential surface of the first driving shaft (340) and a spring (430) sleeved on the first driving shaft (340) and pre-tightened between the collar (343) and the first block (410), the first block (410) being arranged on the side of the collar (343) facing the second block (420), and the spring (430) being used for pressing the first block (410) against the second block (420).

6. The on-off trailer jack of claim 2 wherein: The end surface of the first block (410) facing the second block (420) is provided with a plurality of teeth (414) arranged at intervals, and the teeth (414) adjacent to each other form a groove (415); The end surface of the second block (420) facing the first block (410) is provided with a plurality of teeth (414) arranged adjacent to each other, and the teeth (414) adjacent to each other form a groove (415); When the first block (410) and the second block (420) are engaged, the teeth (414) are engaged in the grooves (415) for transmission.

7. A hitch-type trailer jack as claimed in any one of claims 2 to 6, wherein: The telescopic mechanism (100) further comprises an outer support (140), an inner support (110) and a nut (120) fixedly arranged on the inner support (110), the lead screw (130) and the nut (120) being threadedly connected, the outer support (140) being sleeved outside the inner support (110), the outer support (140) being used for connecting a vehicle frame, and the lead screw (130) being in transmission connection with the gear shifting mechanism (300); The outer support (140) is further provided with a support assembly (150), the support assembly (150) comprising a support seat (151) fixedly arranged on the outer support (140), a limiting plate (152) arranged on the outer support (140), and a thrust bearing (153) arranged between the support seat (151) and the limiting plate (152), the limiting plate (152) being arranged below the support seat (151), the lead screw (130) being further fixedly provided with a support ring (131), the lead screw (130) being arranged in a through hole in the middle of the thrust bearing (153), and the thrust bearing (153) being provided with two, the two thrust bearings (153) being respectively abutted on both sides of the support ring (131) for axial limiting.

8. A hitch-type trailer jack as defined in claim 7, wherein: The transmission mechanism (500) further comprises a transmission shaft (510) rotatably arranged on the support seat (151), a driving bevel gear (521) fixedly arranged on the transmission shaft (510) and a driven bevel gear (522) fixedly arranged on the end of the lead screw (130), the driving bevel gear (521) and the driven bevel gear (522) being in engagement. The second insert block (420) is fixedly arranged at the end of the transmission shaft (510) close to the first insert block (410), and the second insert block (420) is coaxially arranged with the transmission shaft (510).

9. A hitch-type trailer jack as claimed in any one of claims 1 to 6, wherein: The transmission mechanism (300) is fixedly connected to the telescopic mechanism (100), an input shaft (320) of the transmission mechanism (300) is in transmission connection with an output shaft of the electric structure (200), an output end of the transmission mechanism (300) is in transmission connection with the clutch mechanism (400), and the transmission mechanism (300) is used for adjusting the rotation speed and torque output by the electric structure (200).

10. A hitch-type trailer jack as claimed in any one of claims 2 to 6, wherein: The manual structure (132) is a spline shaft structure integrally arranged at the top of the lead screw (130). Or the manual structure (132) is a second driving shaft (160), the second driving shaft (160) is in rotary connection with the telescopic mechanism (100), one end of the second driving shaft (160) is in transmission connection with the lead screw (130), and the other end of the second driving shaft (160) is a spline shaft structure and is arranged outside the telescopic mechanism (100).

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