Lightweight electric adjusting supporting leg assembly for motor home

Abstract

The invention discloses a light-weight electric adjusting supporting leg assembly for a motor home, and relates to the technical field of motor home supporting components. Comprising a supporting leg fixing seat fixedly connected with a motor home body floor; the lead screw sub-assembly comprises a lead screw body and a lead screw nut, the two ends of the lead screw body are connected with a first lead screw support and a second lead screw support respectively, and the periphery of the lead screw nut is sleeved with a third lead screw support; the lead screw reinforcing rod sub-assembly comprises lead screw reinforcing rod bodies which are symmetrically mounted on the lead screw sub-assembly; the supporting leg sub-assembly comprises a first traction bracket, a second traction bracket and a third traction bracket of which the end parts are connected together; the gear reducer sub-assembly comprises a gear reducer body, and the gear reducer body is connected with the lead screw body through a coupler; and the servo motor is connected with the gear reducer subassembly. The supporting leg assembly is reasonable in structure, time and labor are saved during operation, the supporting leg assembly can be matched with various motor home chassis structures, and the composite function of efficient leveling and stable supporting is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of RV support components, and particularly relates to a lightweight electric adjustable leg assembly for RVs. Background Art

[0002] As a key component to ensure the stability of the vehicle, the RV support system currently mainly adopts three technical solutions: electric adjustable legs, manual adjustable legs, and electric jacks. In the prior art, the support devices are generally arranged at four positions of the front left, front right, rear left, and rear right of the vehicle, and the parking stability is achieved by the contact of the support legs with the ground. When moving, the legs need to be lifted to a height above the ground. However, there are still significant technical defects in the functional implementation and structural design of the existing support systems:

[0003] For the manual adjustable legs, the core defect is the lack of an automatic leveling function. The operator needs to manually observe and adjust the height of each leg one by one, resulting in low adjustment efficiency and poor leveling accuracy. Especially in complex terrain conditions, it is difficult to quickly level the vehicle body, seriously affecting the user experience.

[0004] Although the existing electric adjustable legs improve the operation convenience, there are the following structural defects in the technical implementation: (1) The functional redundancy is insufficient, relying entirely on electric drive and lacking a manual emergency operation mode, there is a safety risk in case of a power system failure; (2) There are defects in the mechanical transmission design in terms of load matching. When the end of the leg touches the ground instantaneously, the mechanical structure has a rigid contact, resulting in a sudden increase in the motor load and causing electrical system failures such as fuse blowing; (3) The power system integration is insufficient. The motor and the cable need to move synchronously with the moving parts of the leg, resulting in repeated bending of the cable, causing wear of the insulation layer and poor contact; (4) The installation adaptability is limited. It needs to be fixedly installed relying on the rigid structural parts of the vehicle frame and is difficult to adapt to the structural characteristics of different vehicle models.

[0005] The electric jack has significant limitations in the application aspect: (1) The volume and weight parameters exceed the standard, and it is only applicable to large-space vehicle models such as type C RVs, and there is a problem of space occupation for compact RVs; (2) The chassis adaptability is poor. Especially for towed RVs, it is difficult to match the installation position due to the difference in the chassis structure; (3) There are defects in the mechanical linkage structure. When using a common transmission mechanism for double legs, the movement of one side leg will affect the state of the opposite side leg through mechanical coupling, resulting in a reduction in the body attitude control accuracy.

[0006] The above technical defects lead to technical bottlenecks such as high operation complexity, low system reliability, and poor environmental adaptability in the existing RV support systems, and it is difficult to meet the usage requirements of RV users for quick leveling, safety and stability, and multi-scenario adaptation. Summary of the Invention

[0007] The object of the present invention is to provide a lightweight electric adjustable leg assembly for a motorhome, which has a reasonable structure, is time-saving and labor-saving in operation, can adapt to various motorhome chassis structures, and realizes the composite functions of efficient leveling and stable support.

[0008] To achieve the above object, the present application proposes a lightweight electric adjustable leg assembly for a motorhome, including:

[0009] A leg fixing seat, which is firmly connected to the floor of the motorhome body;

[0010] A lead screw sub-assembly, including a lead screw body and a lead screw nut. Both ends of the lead screw body are respectively connected with a first lead screw support and a second lead screw support. The outer circumference of the lead screw nut is sleeved with a third lead screw support. The lead screw nut moves along the lead screw body between the first lead screw support and the second lead screw support;

[0011] A lead screw reinforcing bar sub-assembly, including lead screw reinforcing bar bodies symmetrically installed on the lead screw sub-assembly;

[0012] A leg sub-assembly, including a first traction bracket, a second traction bracket, and a third traction bracket whose ends are connected together. The first traction bracket is also connected to the third lead screw support. The second traction bracket is connected to the driving end of the leg fixing seat. The third traction bracket is connected to one end of the leg body, and the other end of the leg body is connected to the fixed end of the leg fixing seat;

[0013] A gear reducer sub-assembly, including a gear reducer body, which is connected to the lead screw body through a coupling;

[0014] A servo motor, which is connected to the gear reducer sub-assembly.

[0015] In one embodiment, a hexagonal nut is reserved at one end of the lead screw body. When the gear reducer sub-assembly and / or the servo motor fails, the hexagonal nut extends into the sleeve at the end of the spare manual crank.

[0016] In one embodiment, the servo motor is electrically connected to a terminal controller. Four start / stop buttons for controlling the corresponding servo motors are provided on the terminal controller, and a start / stop button for controlling all servo motors simultaneously is also provided.

[0017] In one embodiment, one end of the lead screw body is connected to the first lead screw support through a first bearing, and the other end is connected to the second lead screw support through a second bearing. A first sealing ring is provided between the second bearing and the second lead screw support.

[0018] In one embodiment, a bearing inner ring limit plug is sleeved on the lead screw body outside the second bearing, and a bearing outer ring limit plug is provided outside the second lead screw support. A second sealing ring is provided between the second bearing and the bearing inner ring limit plug.

[0019] In one embodiment, a preloading nut sleeved on the lead screw body is provided on one side of the bearing outer ring limit plug cover, and the bearing outer ring limit plug cover is fixed to the second lead screw support by a plug cover screw.

[0020] In one embodiment, the lead screw reinforcing rod body is disposed through the first lead screw support, the second lead screw support, and the third lead screw support, and both sides are fixed by flange nuts.

[0021] In one embodiment, the ends of the first traction bracket, the second traction bracket, and the third traction bracket are connected by a first hinge pin, and the first traction bracket is also connected to the third lead screw support by a first hinge pin.

[0022] In one embodiment, the leg subassembly further includes a leg base, a transfer shaft is provided on the leg base, and the connection end of the third traction bracket and the leg body is sleeved on the transfer shaft.

[0023] In one embodiment, the gear reducer subassembly further includes a reducer bracket, a first fastener, and a second fastener. The reducer bracket is located at the driving end of the lead screw subassembly and is locked to the leg fixing seat by the first fastener. The gear reducer body is installed outside the reducer bracket by the second fastener, and the coupling is located inside the reducer bracket.

[0024] The above technical solutions adopted by the present invention, compared with the prior art, have the following advantages:

[0025] 1. The four legs of this application support synchronous automatic control and independent automatic control.

[0026] 2. The leg fixing seat and the vehicle body floor are connected at multiple points, reducing the floor pressure and improving the stability.

[0027] 3. Adopting a double-degree-of-freedom combined ground support structure can adapt to ground conditions with different slopes.

[0028] 4. When the gear reducer subassembly and / or the servo motor fails, a spare manual crank can be used for manual lifting adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the support state of the lightweight electric adjustable leg assembly for a motorhome;

[0030] Figure 2 It is a schematic diagram of the retracted state of the lightweight electric adjustable leg assembly for a motorhome with a spare manual crank;

[0031] Figure 3 It is a schematic diagram of the structure of the spare manual crank;

[0032] Figure 4 It is a schematic structural diagram of the outrigger fixed seat;

[0033] Figure 5 It is a schematic structural diagram of the lead screw sub-assembly;

[0034] Figure 6 It is a sectional view of the lead screw sub-assembly;

[0035] Figure 7 It is an axonometric view of the lead screw sub-assembly;

[0036] Figure 8 It is a schematic structural diagram of the lead screw reinforcement rod sub-assembly;

[0037] Figure 9 It is a schematic structural diagram of the outrigger sub-assembly;

[0038] Figure 10 It is a partially enlarged view of the structure of the outrigger sub-assembly;

[0039] Figure 11 It is a schematic structural diagram of the gear reducer sub-assembly.

[0040] Among them: 1. Outrigger fixed seat, 2. Lead screw sub-assembly, 3. Lead screw reinforcement rod sub-assembly, 4. Outrigger sub-assembly, 5. Coupling, 6. Gear reducer sub-assembly, 7. Servo motor, 8. Spare manual crank;

[0041] 11. First bolt;

[0042] 21. First lead screw support; 22. Third lead screw support; 23. Second lead screw support; 24. Lead screw nut; 25. Second bolt; 26. First bearing; 27. Second bearing; 28. First sealing ring; 29. Second sealing ring; 210. Bearing outer ring limit plug; 211. Plug screw; 212. Bearing inner ring limit plug; 213. Pre-tightening nut; 214. Lead screw body; 215. Hexagonal nut;

[0043] 31. Lead screw reinforcement rod body; 32. Flange nut;

[0044] 41. Outrigger body; 42. Step screw; 43. First hinge pin; 44. First traction bracket; 45. Second traction bracket; 46. Third traction bracket; 47. Adapter shaft; 48. Outrigger base; 49. Second hinge pin;

[0045] 61. Gear reducer body; 62. Reducer support; 63. First fastener; 64. Second fastener. Specific implementation method

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0047] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0049] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to this application.

[0050] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] As Figure 1 shown, this embodiment provides a lightweight electric adjustable leg assembly for a recreational vehicle, including:

[0052] A leg fixing seat, as Figure 4 shown, is fixedly connected to the floor of the recreational vehicle body through a first bolt in a multi-point fastening manner to ensure the stable connection between the leg and the body and effectively disperse the force.

[0053] The lead screw sub-assembly, such as Figures 5 - 7 shown, includes a lead screw body and a lead screw nut; both ends of the lead screw body are supported by a first lead screw support and a second lead screw support respectively; a third lead screw support is sleeved on the outer periphery of the lead screw nut and fixed by a second bolt; the lead screw nut can move along the lead screw body between the first lead screw support and the second lead screw support; preferably, one end of the lead screw body is connected to the first lead screw support through a first bearing, and the other end is connected to the second lead screw support through a second bearing. A first sealing ring is provided between the second bearing and the second lead screw support, which can effectively prevent dust and moisture from entering and extend the service life of the bearing. A bearing inner ring limit plug cover sleeved on the lead screw body is provided outside the second bearing, and a bearing outer ring limit plug cover is provided outside the second lead screw support. A second sealing ring is provided between the second bearing and the bearing inner ring limit plug cover to form a double-sealing protection and further improve the waterproof and dustproof performance. A pre-tightening nut sleeved on the lead screw body is provided on one side of the bearing outer ring limit plug cover, and the bearing outer ring limit plug cover is fixed to the second lead screw support by a plug cover screw, which can adjust the bearing pre-tightening force to ensure the transmission accuracy.

[0054] The lead screw reinforcing bar sub-assembly, such as Figure 8 shown, includes lead screw reinforcing bar bodies symmetrically installed on both sides of the lead screw sub-assembly. The lead screw reinforcing bar bodies penetrate through the first lead screw support, the second lead screw support, and the third lead screw support, and are fixed by flange nuts on both sides to form a stable frame structure, which can effectively resist lateral forces;

[0055] The leg sub-assembly, such as Figures 9 - 10 shown, includes a first traction bracket, a second traction bracket, a third traction bracket, and a leg base that are connected to each other; the first traction bracket is connected to the third lead screw support to achieve power transmission; the second traction bracket is fixed to the driving end of the leg fixing seat by a step screw; the third traction bracket is connected to one end of the leg body, and the other end of the leg body is fixed to the fixed end of the leg fixing seat by a step screw; to ensure the stability and reliability during the movement of the leg; preferably, a transfer shaft is provided on the leg base, and the connection end of the third traction bracket and the leg body is connected to the transfer shaft by a second hinge pin to achieve the adaptive contact between the leg and the ground and improve the stability; the ends of the first traction bracket, the second traction bracket, and the third traction bracket are connected by a first hinge pin, and the first traction bracket is also connected to the third lead screw support by a first hinge pin. The articulated design makes the movement of the leg more flexible and adaptable to different working conditions.

[0056] The gear reducer sub-assembly, such as Figure 11As shown in the figure, it includes a gear reducer body, a reducer bracket, a first fastener and a second fastener. The gear reducer body is connected to the lead screw body through a coupling to provide stable speed reduction transmission. The reducer bracket is located at the driving end of the lead screw subassembly and is locked to the leg fixed seat through the first fastener. The gear reducer body is installed on the outside of the reducer bracket through the second fastener. The coupling is located inside the reducer bracket. This layout structure is compact, has high transmission efficiency and is convenient for maintenance.

[0057] Servo motor: Connected to the gear reducer subassembly to provide precise power output. This servo motor supports the access of the ACC signal and automatically retracts the legs when starting the fire. It should be noted that during the no-load stage: when the legs are not in contact with the ground, the servo motor drives for fast movement. During the contact stage: when the legs just contact the ground, the servo motor switches to the slow descent mode to avoid impact. During the support stage: during the process of the legs from contacting the ground to being fully supported, the operation is stable and the motor load is small. During the load-bearing stage: after the legs are fully supported, the lead screw subassembly bears a lower torque and the structural deformation is small.

[0058] As Figures 2 - 3 shown in the figure, a hexagonal nut is reserved at one end of the lead screw body. When the gear reducer subassembly and / or the servo motor fails, the hexagonal nut can be inserted into the sleeve at the end of the spare manual crank to realize emergency manual operation and ensure the reliability of the legs.

[0059] As a preferred implementation provided in this embodiment, the servo motor is electrically connected to the terminal controller. Four start-stop buttons for controlling the corresponding servo motors are provided on the terminal controller, and a start-stop button for controlling all servo motors simultaneously is also provided to realize the individual or synchronous control of the legs and improve the operation convenience.

[0060] When the RV parks, operate the terminal controller to send an electrical signal to the servo motor to drive the servo motor to rotate counterclockwise. The rotation of the motor drives the gear reducer body to work, converting high-speed low-torque into low-speed high-torque output. This torque is transmitted to the lead screw subassembly through the coupling to drive the lead screw body to rotate. During the rotation of the lead screw body, the third lead screw support moves axially backward along the lead screw body. The backward displacement of the third lead screw support drives the first traction bracket to generate a combined movement backward and downward, and the first traction bracket also drives the second traction bracket to move synchronously. Under the coordinated action of the first traction bracket, the second traction bracket and the leg body, the third traction bracket presents a movement trajectory forward and downward. This linkage process prompts the adapter shaft and the leg base to extend forward and downward. When the leg base contacts the ground, the rotation pair design of the second hinge pin ensures that the bottom surface of the base is completely fitted with the ground, completing the stable support of the legs. When the legs need to be retracted, the terminal controller sends a reverse electrical signal to make the servo motor rotate clockwise, and the legs can be smoothly retracted.

[0061] In addition, this design is also equipped with an emergency manual operation plan: in special situations such as power system failures, manual adjustment can be carried out through a spare manual crank to achieve the lifting function of the outriggers, ensuring the reliability of the outrigger assembly under various working conditions.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lightweight electric adjustable leg assembly for a motorhome, having four electric adjustable legs, characterized in that, Each electric adjustable outrigger includes: An outrigger fixed seat, which is fixedly connected to the floor of the RV body; A lead screw subassembly, including a lead screw body and a lead screw nut. The two ends of the lead screw body are respectively connected with a first lead screw support and a second lead screw support. The outer circumference of the lead screw nut is sleeved with a third lead screw support. The lead screw nut moves along the lead screw body between the first lead screw support and the second lead screw support; A lead screw reinforcement bar subassembly, including lead screw reinforcement bar bodies symmetrically installed on the lead screw subassembly; An outrigger subassembly, including a first traction bracket, a second traction bracket, and a third traction bracket whose ends are connected together. The first traction bracket is also connected to the third lead screw support. The second traction bracket is connected to the drive end of the outrigger fixed seat. The third traction bracket is connected to one end of the outrigger body, and the other end of the outrigger body is connected to the fixed end of the outrigger fixed seat; A gear reducer subassembly, including a gear reducer body, which is connected to the lead screw body through a coupling; A servo motor, which is connected to the gear reducer subassembly.

2. The lightweight electric adjustable support leg assembly for a motorhome according to claim 1, characterized in that, A hexagonal nut is reserved at one end of the lead screw body. When the gear reducer subassembly and / or the servo motor fails, the hexagonal nut extends into the sleeve at the end of the spare manual crank.

3. The lightweight electric adjustable support leg assembly for a motorhome according to claim 1, characterized in that, The servo motor is electrically connected to the terminal controller. Four start / stop buttons for controlling the corresponding servo motors are provided on the terminal controller, and a start / stop button for controlling all servo motors simultaneously is also provided.

4. The lightweight electric adjustable support leg assembly for a motorhome according to claim 1, wherein, One end of the lead screw body is connected to the first lead screw support through a first bearing, and the other end is connected to the second lead screw support through a second bearing. A first sealing ring is provided between the second bearing and the second lead screw support.

5. The lightweight electric adjustable outrigger assembly for a motorhome according to claim 4, wherein An inner ring limit plug for the bearing is sleeved on the lead screw body outside the second bearing, and an outer ring limit plug for the bearing is provided outside the second lead screw support. A second sealing ring is provided between the second bearing and the inner ring limit plug for the bearing.

6. The lightweight electric adjustable support leg assembly for a motorhome according to claim 5, characterized in that, A pre-tightening nut is sleeved on the lead screw body on one side of the outer ring limit plug for the bearing. The outer ring limit plug for the bearing is fixed to the second lead screw support through a plug screw.

7. The lightweight electric adjustable outrigger assembly for a motorhome according to claim 1, wherein The lead screw reinforcement bar bodies are arranged through the first lead screw support, the second lead screw support, and the third lead screw support, and are fixed on both sides through flange nuts.

8. The lightweight electric adjustable outrigger assembly for a motorhome according to claim 1, characterized in that, The ends of the first traction bracket, the second traction bracket, and the third traction bracket are connected by a first hinge pin. The first traction bracket is also connected to the third lead screw support through a first hinge pin.

9. The lightweight electric adjustable support leg assembly for a motorhome according to claim 1, characterized in that, The outrigger subassembly further includes an outrigger base, on which a transfer shaft is provided. The connection end of the third traction bracket and the outrigger body is sleeved on the transfer shaft.

10. The lightweight electric adjustable outrigger assembly for a motorhome according to claim 1, characterized in that, The gear reducer subassembly further includes a reducer bracket, a first fastener, and a second fastener. The reducer bracket is located at the drive end of the lead screw subassembly and is locked to the outrigger fixed seat through the first fastener. The gear reducer body is installed outside the reducer bracket through the second fastener, and the coupling is located inside the reducer bracket.

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