Hydraulic lifting type suspension device for rear frame of motor home

Abstract

The utility model discloses a motor home rear frame hydraulic lifting type suspension device which comprises a hydraulic damping assembly hinged to one end of a transverse arm, the middle of the transverse arm is fixedly connected with one end of a longitudinal arm, a transverse connecting sleeve is arranged at the other end of the longitudinal arm and fixedly connected with a frame, one end of a spring is fixed to a first support of the longitudinal arm, and the other end of the spring is fixed to a second support of the longitudinal arm. The other end of the spring is fixed on a second support of the frame; an elastic element is arranged in the middle of the spring; the first hydraulic shock absorber and the second hydraulic shock absorber are arranged in parallel and hinged to the frame, and the third hydraulic shock absorber and the second hydraulic shock absorber are arranged at an acute angle and hinged to the frame. According to the utility model, the defects in the prior art are overcome, the adjustable height of the rear frame of the motor home is ensured through the elastic element and the hydraulic damping component, meanwhile, the transverse damping and buffering of the frame are realized, the problem that the frame shakes severely due to the higher gravity center of the motor home when the motor home encounters an uneven ground is avoided, and better riding experience is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle frame suspension, in particular to a hydraulic lifting suspension device for the rear frame of a recreational vehicle. Background Art

[0002] Suspension is a general term for all force-transmitting connection devices between a vehicle's frame and axles or wheels. Its function is to transmit the force and torque acting between the wheels and the frame, to cushion the impact force transmitted to the frame or body by uneven roads, and to attenuate the vibration caused thereby to ensure that the vehicle can run smoothly.

[0003] With rising living standards, traveling has become a popular way for people to relax and unwind during their vacations. RVs, as a travel product that combines the functions of a "house" with a "car," are gaining popularity. A trailer RV is a recreational vehicle that is attached to the back of a tractor and towed. The suspension used in RVs is a key component that influences their driving performance. Currently, existing RV suspensions typically consist of two wheels, a through-axle, and two leaf springs. The two wheels are rotatably supported at either end of the through-axle, and the leaf springs are fixed between the through-axle and the vehicle frame by clamps. When the RV is driving on the road, the vibrations generated by the wheels are buffered by the leaf springs, keeping the frame relatively stable. Since the two wheels are supported for rotation at both ends of the same through-axle, when the RV is traveling on a bumpy road, the two wheels contact different road conditions and are very likely to interfere with each other, causing large vibrations in the vehicle body. In addition, the above-mentioned suspension structure is a non-independent suspension structure in which the two wheels are connected to the same through-axle. When the RV is traveling at high speeds, its smoothness is poor. At the same time, the leaf spring fixedly connected between the through-axle and the frame causes its ground clearance to be too low (≤200mm), making the RV unsuitable for off-road applications.

[0004] Chinese patent CN204726173U discloses an independent suspension system for recreational vehicles, comprising a half-axle, a transverse arm, a longitudinal arm, a spring, and at least one hydraulic shock absorber. The half-axle is fixedly connected to the transverse arm. One end of the longitudinal arm is fixedly connected to the transverse arm, and the other end is fixedly connected to a transverse connecting sleeve, which is hinged to a hinge seat on the recreational vehicle frame. The upper portion of the transverse connecting sleeve is provided with at least one lower hinge seat, and at least one upper hinge seat is provided on the upper portion. The ends of the hydraulic shock absorber are hingedly connected to the transverse arm and the recreational vehicle frame. A spring lower support is provided on the longitudinal arm, and an upper spring support is provided on the recreational vehicle frame. The ends of the spring are respectively assembled in the upper and lower spring supports. However, due to the high center of gravity of recreational vehicles, the vehicle is significantly affected by road conditions during driving, resulting in significant body sway. This system connects the frame to the suspension via springs, transverse connecting sleeves, and hydraulic shock absorbers. The hinged connection between the hydraulic shock absorber and the transverse connecting sleeve provides insufficient cushioning for lateral frame sway, resulting in a poor ride experience. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a hydraulic lifting suspension device for the rear frame of a motorhome, which overcomes the shortcomings of the existing technology and aims to solve the problem of insufficient lateral buffering of the vehicle body by the hydraulic lifting suspension device at the rear frame of the existing motorhome.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic lifting suspension device for the rear frame of a motorhome, comprising a frame, a transverse connecting sleeve, a longitudinal arm, a spring, a hydraulic shock absorber assembly and a transverse arm, one end of the transverse arm is connected to the wheel axle, the other end of the transverse arm is hinged to the hydraulic shock absorber assembly, the middle part of the transverse arm is fixedly connected to one end of the longitudinal arm, the other end of the longitudinal arm is provided with a transverse connecting sleeve, the transverse connecting sleeve is fixedly connected to the frame, one end of the spring is fixed to the first support seat of the longitudinal arm, the other end of the spring is fixed to the second support seat of the frame, and an elastic element is provided in the middle part of the spring; the hydraulic shock absorber assembly comprises a first hydraulic shock absorber, a second hydraulic shock absorber and a third hydraulic shock absorber, the first hydraulic shock absorber and the second hydraulic shock absorber are arranged in parallel and hinged to the frame, and the third hydraulic shock absorber is arranged at an acute angle to the second hydraulic shock absorber and hinged to the frame.

[0007] During operation, when the ground is uneven, the hydraulic suspension device is started, the first hydraulic shock absorber and the second hydraulic shock absorber are raised, and the distance between the frame and the ground is increased. The vibration of the wheel caused by the uneven ground is transmitted to the spring and the hydraulic shock absorber assembly through the cross arm. The spring is compressed under the action of the force to cushion the impact of the cross arm on the frame. If it is subjected to a large impact force, the elastic element in the middle of the spring participates in the cushioning and absorbs the vibration energy; at the same time, after the first hydraulic shock absorber and the second hydraulic shock absorber are subjected to the impact force, the vibration energy is absorbed by the internal liquid buffer. After the vibration of the frame, the hinge connection of the third hydraulic shock absorber adapts to change the connection angle, which can give the frame the lateral impact force and part of the vertical impact force, cushioning and absorbing the lateral shaking of the frame; after the uneven ground section ends, the first hydraulic shock absorber and the second hydraulic shock absorber are lowered, and after the frame is lowered, the hinge connection of the third hydraulic shock absorber changes the connection angle, which can still cushion and absorb the lateral impact force of the frame.

[0008] As a preferred technical solution of the present invention, the cross arm includes a cross arm body, a half-arm, a first connecting part, a second connecting part and a third connecting part. One end of the cross arm body is connected to the wheel axle, and the other end of the cross arm body is fixedly connected to the half-arm. The half-arm and the cross arm body are arranged at an acute angle. The third connecting part is arranged in the middle of the cross arm body for fixedly connecting the longitudinal arm; the first connecting part and the second connecting part are arranged in a horizontal line adjacent to the half-arm, for respectively articulating the first hydraulic shock absorber and the second hydraulic shock absorber.

[0009] As a preferred technical solution of the present invention, the half-arm includes a fixed part and a first mounting part. The fixed part is a cube with a hole, which is used to be connected and fixed to the end of the cross arm. The other end of the fixed part is connected to the first mounting part. The other end of the first mounting part is provided with a hinged structure for connecting to the third hydraulic shock absorber.

[0010] As a preferred technical solution of the present utility model, the longitudinal arm also includes a first longitudinal arm, a second longitudinal arm, and a fixed bracket. One end of the first longitudinal arm and the second longitudinal arm are fixedly connected at an acute angle, and the first longitudinal arm and the second longitudinal arm are connected to a transverse connecting sleeve at the other end, and the transverse connecting sleeve is hinged to the frame; the fixed bracket connects the first longitudinal arm and the second longitudinal arm, and the fixed bracket is adjacent to the frame and is used to strengthen the structural rigidity of the longitudinal arm; the first support seat is arranged at the place where one end of the first longitudinal arm and the second longitudinal arm are fixedly connected at an acute angle.

[0011] As an optimal technical solution of the present invention, the first support seat includes a base, a guide shaft and a plastic sleeve. The guide shaft and the plastic sleeve are fixed on the base. The guide shaft is a column and is arranged in a through hole in the middle of the plastic sleeve.

[0012] As an optimal technical solution of the present invention, the spring is arranged in the middle through hole of the plastic sleeve and is clearance-matched with the plastic sleeve; the elastic element is fixed on the guide shaft, and the diameter d of the elastic element is smaller than the inner diameter D of the spring.

[0013] As a preferred technical solution of the present invention, the vehicle frame further comprises a plurality of hinge connections and a transverse hinge connection, and the transverse hinge connection is arranged at an acute angle to the transverse direction of the vehicle frame.

[0014] Compared with the existing technology, the utility model uses elastic elements and hydraulic shock-absorbing components to ensure that the rear frame of the RV can be adjusted in height while achieving lateral shock absorption and buffering of the frame, avoiding the problem of violent frame shaking due to the high center of gravity of the RV when the RV encounters uneven ground, thereby obtaining a better riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic top view of the first support base of the utility model;

[0017] Figure 3 for Figure 2 AA section view in;

[0018] Figure 4 This is a schematic diagram of the half-arm structure of the present utility model;

[0019] In the figure: 1. frame; 101. second support; 102. hinge connection; 103. transverse hinge connection; 2. transverse connecting sleeve; 3. longitudinal arm; 301. first support seat; 3011. base; 3012. guide shaft; 3013. plastic sleeve; 302. first longitudinal arm; 303. second longitudinal arm; 304. fixed bracket; 4. spring; 401. elastic element; 5. hydraulic shock absorber assembly; 501. first hydraulic shock absorber; 502. second hydraulic shock absorber; 503. third hydraulic shock absorber; 6. transverse arm; 601. transverse arm body; 602. half arm; 6021. fixing part; 6022. first mounting part; 603. first connecting part; 604. second connecting part; 605. third connecting part; 7. wheel axle. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 4 , a hydraulic lifting suspension device for the rear frame of a RV, including a frame 1, a transverse connecting sleeve 2, a longitudinal arm 3, a spring 4, a hydraulic shock absorber assembly 5 and a transverse arm 6, one end of the transverse arm 6 is connected to a wheel axle 7, and the other end of the transverse arm 6 is hinged to the hydraulic shock absorber assembly 5, the middle part of the transverse arm 6 is fixedly connected to one end of the longitudinal arm 3, the other end of the longitudinal arm 3 is provided with a transverse connecting sleeve 2, the transverse connecting sleeve 2 is fixedly connected to the frame 1, one end of the spring 4 is fixed to the first support seat 301 of the longitudinal arm 3, the other end of the spring 4 is fixed to the second support 101 of the frame 1, and an elastic element 401 is provided in the middle part of the spring 4; the hydraulic shock absorber assembly 5 includes a first hydraulic shock absorber 501, a second hydraulic shock absorber 502 and a third hydraulic shock absorber 503, the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are arranged in parallel and hinged to the frame 1, and the third hydraulic shock absorber 503 is arranged at an acute angle to the second hydraulic shock absorber 502 and hinged to the frame 1.

[0021] During operation, if the ground is uneven, the hydraulic suspension device is activated, and the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are raised to increase the clearance of the frame 1 from the ground. The vibration caused by the uneven ground to the wheels is transmitted to the spring 4 and the hydraulic shock absorber assembly 5 through the cross arm 6. The spring 4 is compressed under the action of the force, cushioning the impact of the cross arm 6 on the frame 1. If the impact force is large, the elastic element 401 in the middle of the spring 4 participates in the buffering and absorbs the vibration energy. At the same time, after the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are subjected to the impact force, the vibration energy is absorbed by the internal liquid buffer. After the vibration of the frame 1, the third hydraulic shock absorber 503 is hingedly connected to adapt and change the connection angle, which can apply lateral impact force and part of the vertical impact force to the frame 1, cushioning and absorbing the lateral shaking of the frame 1. After the uneven ground section ends, the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are lowered. After the frame 1 is lowered, the third hydraulic shock absorber 503 is hingedly connected to change the connection angle, which can still cushion and absorb the lateral impact force of the frame 1.

[0022] The elastic element 401 and the hydraulic shock-absorbing assembly 5 are arranged in this way to achieve lateral shock absorption and buffering of the frame 1 while ensuring that the rear frame 1 of the RV can be adjusted in height; when the RV encounters uneven ground, the frame 1 shakes more violently due to the high center of gravity of the RV. The elastic element 401 can limit the lateral displacement of the spring 4, thereby preventing the lateral force brought by the frame 1 from being unable to be buffered and absorbed, causing the frame 1 to vibrate in the lateral direction for a long time, affecting the riding experience, and the elastic element 401 can assist the spring 4 in playing a shock-absorbing role, and absorb vibration energy to a certain extent, and attenuate the vibration amplitude; the third hydraulic shock absorber 503 arranged in the hydraulic shock-absorbing assembly 5 can buffer and absorb the lateral vibration brought by the frame 1, thereby avoiding insufficient lateral shock absorption or excessive shock absorption of the frame 1, so as to obtain a better riding experience.

[0023] Specifically, the cross arm 6 includes a cross arm body 601, a half arm 602, a first connecting portion 603, a second connecting portion 604, and a third connecting portion 605. One end of the cross arm body 601 is connected to the wheel axle 7, and the other end of the cross arm body 601 is fixedly connected to the half arm 602. The half arm 602 is arranged at an acute angle to the cross arm body 601. The third connecting portion 605 is located in the middle of the cross arm body 601 and is used to fix the trailing arm 3. The first connecting portion 603 and the second connecting portion 604 are arranged in a horizontal line adjacent to the half arm 602, respectively, for articulating the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502. This arrangement of the cross arm 6 connects the wheel and the frame 1 into a whole. The fixed position of the hydraulic shock absorber assembly 5 is provided in the middle to facilitate the installation of the hydraulic shock absorber assembly 5. The acute angle design of the half arm 602 enables the installation of the third hydraulic shock absorber 503 perpendicular to the half arm 602, improving the efficiency of the third hydraulic shock absorber 503 in buffering and absorbing vibrations.

[0024] Specifically, the half-arm 602 includes a fixing portion 6021 and a first mounting portion 6022. The fixing portion 6021 is a cube with a hole, which is used to connect and fix to the end of the cross arm 6. The other end of the fixing portion 6021 is connected to the first mounting portion 6022. The other end of the first mounting portion 6022 is provided with a hinge structure for connecting to the third hydraulic shock absorber 503. This arrangement facilitates the fixing and connection of the half-arm 602 to the cross arm 6. The cube shape facilitates hollow processing and improves the speed of subsequent installation and removal.

[0025] Specifically, the longitudinal arm 3 also includes a first longitudinal arm 302, a second longitudinal arm 303, and a fixed bracket 304. One end of the first longitudinal arm 302 and the second longitudinal arm 303 are fixedly connected at an acute angle, and the first longitudinal arm 302 and the second longitudinal arm 303 are connected to the transverse connecting sleeve 2 at the other end, and the transverse connecting sleeve 2 is hinged to the frame 1; the fixed bracket 304 connects the first longitudinal arm 302 and the second longitudinal arm 303, and the fixed bracket 304 is adjacent to the frame 1, and is used to strengthen the structural rigidity of the longitudinal arm 3; the first support seat 301 is arranged at the place where one end of the first longitudinal arm 302 and the second longitudinal arm 303 are fixedly connected at an acute angle. The fixed bracket 304 is arranged adjacent to the vehicle frame 1, which shortens the distance between the fixed bracket 304 and the vehicle frame 1. When the vehicle frame 1 moves laterally, the torque on the fixed bracket 304 is reduced, which is beneficial to improving the overall structural rigidity and reliability of the trailing arm 3. The first support seat 301 is arranged adjacent to the wheel axle 7, where the vibration amplitude is maximum. This shortens the distance between the first support seat 301 and the wheel axle 7, preventing the wheel axle 7 from vibrating too much and colliding with the vehicle frame 1, thereby improving the shock absorption and buffering capacity of the device and shortening the buffering reaction time.

[0026] Specifically, the first support base 301 includes a base 3011, a guide shaft 3012, and a plastic sleeve 3013. The guide shaft 3012 and the plastic sleeve 3013 are fixed to the base 3011. The guide shaft 3012 is a column and is disposed in a through hole in the middle of the plastic sleeve 3013. This configuration of the first support base 301 is simple in structure, convenient for installation of various components, and easy for disassembly, which facilitates later maintenance. The provision of the guide shaft 3012 not only provides a lateral limit for the elastic element 401 and the spring 4, but also facilitates the installation and fixation of the elastic element 401.

[0027] Specifically, spring 4 is mounted in the central through-hole of plastic sleeve 3013, with a clearance fit therewith. Elastic element 401 is fixed to guide shaft 3012, with diameter d of elastic element 401 being smaller than inner diameter D of spring 4. This arrangement secures elastic element 401 and assists plastic sleeve 3013 in laterally limiting spring 4, preventing lateral vibration of frame 1 from causing spring 4 to wobble and affect the shock absorption effect.

[0028] Specifically, the vehicle frame 1 further includes a plurality of hinged connections 102 and transverse hinged connections 103, with the transverse connections 103 being arranged at an acute angle relative to the vehicle frame 1. This configuration of the vehicle frame 1 can further stabilize the connection between the shock absorber and the trailing arm 3, reduce the impact of the vibration of the vehicle frame 1 on the components, alleviate wear on the vehicle frame components, extend the service life of the components, and enhance the shock absorption and buffering efficiency of the hydraulic shock absorber assembly 5 and the spring 4.

[0029] When the ground is uneven during operation, the hydraulic suspension device is activated, the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are raised, and the distance between the frame 1 and the ground is increased. The vibration of the wheel caused by the uneven ground is transmitted to the spring 4 and the hydraulic shock absorber assembly 5 through the cross arm 6. The spring 4 is compressed by the force to buffer the impact of the cross arm 6 on the frame 1. If the impact force is large, the elastic element 401 in the middle of the spring 4 participates in buffering and absorbs the vibration energy; at the same time, the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 are After the impact force, the vibration energy is absorbed by the internal liquid buffer. After the frame 1 vibrates, the hinge connection of the third hydraulic shock absorber 503 adapts to change the connection angle, which can provide the lateral impact force of the frame 1 and part of the vertical impact force, and buffer and absorb the lateral shaking of the frame 1; after the uneven ground section ends, the first hydraulic shock absorber 501 and the second hydraulic shock absorber 502 descend, and after the frame 1 descends, the hinge connection of the third hydraulic shock absorber 503 changes the connection angle, which can still buffer and absorb the lateral impact force of the frame 1.

Claims

1. A hydraulic lifting suspension device for a rear frame of a recreational vehicle, comprising a frame (1), a transverse connecting sleeve (2), a longitudinal arm (3), a spring (4), a hydraulic shock absorbing assembly (5) and a transverse arm (6), characterized in that: One end of the transverse arm (6) is connected to a wheel axle (7), the other end of the transverse arm (6) is hinged to a hydraulic shock absorbing assembly (5), the middle of the transverse arm (6) is fixedly connected to one end of the longitudinal arm (3), the other end of the longitudinal arm (3) is provided with a transverse connecting sleeve (2), the transverse connecting sleeve (2) is fixedly connected to the vehicle frame (1), one end of the spring (4) is fixed to the first support seat (301) of the longitudinal arm (3), and the other end of the spring (4) is fixed to the second support seat (10 1), an elastic element (401) is arranged in the middle of the spring (4); the hydraulic shock absorber assembly (5) includes a first hydraulic shock absorber (501), a second hydraulic shock absorber (502) and a third hydraulic shock absorber (503), the first hydraulic shock absorber (501) and the second hydraulic shock absorber (502) are arranged in parallel and are hinged to the vehicle frame (1), and the third hydraulic shock absorber (503) is arranged at an acute angle to the second hydraulic shock absorber (502) and is hinged to the vehicle frame (1).

2. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 1, characterized in that: The cross arm (6) comprises a cross arm body (601), a half arm (602), a first connecting portion (603), a second connecting portion (604) and a third connecting portion (605); one end of the cross arm body (601) is connected to the wheel axle (7); the other end of the cross arm body (601) is fixedly connected to the half arm (602); the half arm (602) and the cross arm body (601) are arranged at an acute angle; the third connecting portion (605) is arranged in the middle of the cross arm body (601) and is used for fixedly connecting to the longitudinal arm (3); the first connecting portion (603) and the second connecting portion (604) are arranged in a horizontal line adjacent to the half arm (602) and are used for respectively articulating the first hydraulic shock absorber (501) and the second hydraulic shock absorber (502).

3. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 2, characterized in that: The half-arm (602) includes a fixing portion (6021) and a first mounting portion (6022). The fixing portion (6021) is a cube with a hole, and is used to be connected and fixed to the end of the cross arm (6). The other end of the fixing portion (6021) is connected to the first mounting portion (6022). The other end of the first mounting portion (6022) is provided with a hinge structure, and is used to be connected to the third hydraulic shock absorber (503).

4. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 3, characterized in that: The longitudinal arm (3) further comprises a first longitudinal arm (302), a second longitudinal arm (303), and a fixed bracket (304); one end of the first longitudinal arm (302) and the second longitudinal arm (303) are fixedly connected at an acute angle; the first longitudinal arm (302) and the second longitudinal arm (303) are connected to a transverse connecting sleeve (2) at the other end; the transverse connecting sleeve (2) is hingedly connected to the vehicle frame (1); the fixed bracket (304) is connected to the first longitudinal arm (302) and the second longitudinal arm (303); the fixed bracket (304) is adjacent to the vehicle frame (1) and is used to strengthen the structural rigidity of the longitudinal arm (3); and the first support seat (301) is arranged at the position where one end of the first longitudinal arm (302) and the second longitudinal arm (303) are fixedly connected at an acute angle.

5. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 1, characterized in that: The first support seat (301) comprises a base (3011), a guide shaft (3012) and a plastic sleeve (3013), wherein the guide shaft (3012) and the plastic sleeve (3013) are fixed on the base (3011), the guide shaft (3012) is a column, and the guide shaft (3012) is arranged in a through hole in the middle of the plastic sleeve (3013).

6. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 5, characterized in that: The spring (4) is arranged in the middle through hole of the plastic sleeve (3013) and is clearance-matched with the plastic sleeve (3013); the elastic element (401) is fixed on the guide shaft (3012), and the diameter d of the elastic element (401) is smaller than the inner diameter D of the spring (4).

7. The hydraulic lifting suspension device for the rear frame of a recreational vehicle according to claim 3, characterized in that: The vehicle frame (1) further comprises a plurality of hinge connections (102) and transverse hinge connections (103), wherein the transverse hinge connections (103) are arranged at an acute angle to the vehicle frame (1) in the transverse direction.

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