Nonlinear vibration reduction hinged steering structure

Abstract

The invention discloses a non-linear vibration reduction hinged steering structure which comprises a hinged steering system and a non-linear vibration reduction structure. The hinged steering system comprises a front hinged seat and a rear hinged seat; the front hinge seat and the rear hinge seat are hinged to each other; the nonlinear vibration reduction structure comprises a steel plate spring, a spiral spring, Y-shaped connecting rods and a pneumatic spring, wherein the Y-shaped connecting rods are arranged at the two ends of the spiral spring respectively. One end of the Y-shaped connecting rod is hinged to the end of the spiral spring, the other end of the Y-shaped connecting rod is hinged to one end of the pneumatic spring, and the other end of the pneumatic spring is hinged to the steel plate spring. The hinge steering structure can adapt to the uneven complex paddy field environment working condition, nonlinear vibration reduction is adopted, impact of a bumpy road section on a hinge steering system can be weakened, and the smoothness of hinge steering is improved; meanwhile, torsion caused by a high-speed turning working condition or uneven road surface steering can be resisted, and the stability of hinged steering is improved.

Description

Technical Field

[0001] The invention relates to the technical field of paddy field chassis steering, and in particular to a nonlinear vibration-damping articulated steering structure. Background Art

[0002] At present, the steering mode of paddy field chassis is mostly Ackerman steering, and some also adopt articulated steering. The articulated steering mode has a small turning radius, strong maneuverability, and the driving path can be the same track. Therefore, the articulated steering mode is used in paddy field chassis for field management, especially agricultural machinery vehicles used for patrolling fields.

[0003] The complex paddy field environment has a negative impact on the articulated steering structure of the paddy field chassis. Driving the paddy field chassis in the paddy field environment will bring impact to the articulated steering structure; turning in the uneven rice rows will cause the articulated steering structure to twist; under harsh working conditions, the articulated steering structure may even break. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned problems and to provide a nonlinear vibration-damping articulated steering structure, which can adapt to the complex and uneven paddy field environment. The use of nonlinear vibration reduction can reduce the impact of bumpy roads on the articulated steering system and improve the smoothness of the articulated steering; at the same time, it can resist the torsion caused by high-speed turning conditions or steering on uneven roads and improve the stability of the articulated steering.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A nonlinear vibration damping articulated steering structure, wherein the nonlinear vibration damping articulated steering structure is arranged between a front half frame and a rear half frame; the nonlinear vibration damping articulated steering structure comprises an articulated steering system and a nonlinear vibration damping structure arranged on the articulated steering system; wherein,

[0007] The articulated steering system comprises a front articulated seat and a rear articulated seat; the front articulated seat and the rear articulated seat are articulatedly connected to each other; the front articulated seat is connected to the front half frame, and the rear articulated seat is connected to the rear half frame;

[0008] The nonlinear vibration damping structure is a three-stage vibration damping structure, which is used to reduce the impact of bumpy road sections on the articulated steering system and to resist the torsion caused by high-speed turning conditions or steering due to uneven roads; the nonlinear vibration damping structure includes a leaf spring, a coil spring, a Y-shaped connecting rod respectively arranged at both ends of the coil spring, and a pneumatic spring arranged between each Y-shaped connecting rod and the leaf spring; the coil spring is arranged horizontally, one end of the Y-shaped connecting rod is hinged to the end of the coil spring, the other end of the Y-shaped connecting rod is hinged to one end of the pneumatic spring, and the other end of the pneumatic spring is hinged to the leaf spring.

[0009] The working principle of the above nonlinear vibration damping articulated steering structure is:

[0010] The leaf spring constitutes the first-stage vibration reduction structure, the coil spring constitutes the second-stage vibration reduction structure, and the coil spring constitutes the third-stage vibration reduction structure; when working, the paddy field chassis drives into the paddy field from the ground. Due to the low terrain of the paddy field, there will be a drop, which will bring impact to the articulated steering system connected between the front half frame and the rear half frame; at the same time, the paddy field chassis travels in the paddy field, and due to the uneven environment of the paddy field, the paddy field chassis will be bumpy and vibrated; the impact and vibration will first be transmitted to the first-stage vibration reduction structure, at which time the leaf spring will deform to absorb the first wave of large impact, and then be transmitted to the second-stage vibration reduction structure, at which time the pneumatic spring will buffer and react on the spatial Y-shaped connecting rod to transmit the impact to the third-stage vibration reduction structure, at which time the coil spring will deform to absorb the remaining impact energy and reduce the stress concentration caused by the impact on the articulated steering system.

[0011] Due to the uneven environment of the paddy field, the paddy field chassis will tilt to a certain extent. When the paddy field chassis turns or makes a U-turn in the paddy field, the articulated steering system will be subjected to impact and a certain degree of torsion. The impact and vibration will first be transmitted to the first-stage shock absorbing structure. At this time, the leaf spring will deform to absorb the first wave of large impact, and then be transmitted to the second-stage shock absorbing structure. At this time, the pneumatic spring will buffer and react on the spatial Y-shaped connecting rod to transmit the impact to the third-stage shock absorbing structure. At this time, the coil spring will be deformed. Since the coil spring is set horizontally, it will not only reduce the stress concentration caused by the impact on the articulated steering system, but also resist the torsion of the articulated steering system.

[0012] A preferred embodiment of the present invention, wherein the front articulated seat includes a swivel support column, a vertical fixed support, an intermediate connecting plate fixedly arranged between the swivel support column and the vertical fixed support, and a trapezoidal connecting clamp arranged on both sides of the swivel support column; the number of the intermediate connecting plates is two, and the two intermediate connecting plates are distributed up and down, and the vertical fixed support is connected to the front half frame; the rear articulated seat includes swivel bearing fixed supports respectively arranged at the upper and lower ends of the front articulated seat and symmetrically arranged; each of the swivel bearing fixed supports is connected to the swivel support column via a swivel bearing, and the two swivel bearing fixed supports are connected to the rear half frame. In the above structure, by setting a swivel bearing, relative rotation can occur between the front articulated seat and the rear articulated seat, and the specific structural arrangement of the above front articulated seat and the rear articulated seat can make the steering system more compact and the structure more stable.

[0013] Preferably, the number of the nonlinear vibration reduction structures is two groups, and the two groups of nonlinear vibration reduction structures are symmetrically arranged up and down. By arranging two groups of nonlinear vibration reduction structures, a superposition effect is achieved, the shock absorption and energy absorption effect is further improved, the articulated steering system is well protected, and the stability of the articulated steering is improved.

[0014] Preferably, a shock absorber is provided between the two slewing bearing fixed supports, one end of the shock absorber is connected to one of the slewing bearing fixed supports, and the other end of the shock absorber is connected to the other slewing bearing fixed support. By providing the shock absorber, the vibration of the slewing bearing fixed support can be absorbed, thereby ensuring the stability of the articulated steering.

[0015] Preferably, the shock absorber comprises an upper base, a lower base, a shock absorber body arranged between the upper base and the lower base, a main spring, a secondary spring, an intermediate spring cover and a lower spring cover sleeved on the shock absorber body; the upper base is arranged on a slewing bearing fixed support at the upper end, and the lower base is arranged on a slewing bearing fixed support at the lower end; the upper end of the shock absorber body acts on the upper base, and the lower end acts on the lower base; the upper end of the main spring acts on the upper base, and the lower end acts on the intermediate spring cover; the upper end of the secondary spring acts on the intermediate spring cover, and the lower end acts on the lower spring cover. In the above structure, the structure of the main and secondary springs is adopted, which has high elastic restoring force, so that it has higher elastic restoring force and deformation under the same load-bearing capacity, and can effectively absorb the influence of road vibration reduction and paddy field chassis weight; when the main spring vibration reduction is not enough, the secondary spring will share the vibration reduction pressure of the main spring, and the main and secondary springs are superimposed to expand the vibration reduction effect and improve the stability of the articulated steering system.

[0016] Preferably, the nonlinear vibration damping structure is arranged between the vertical fixed support and the middle connecting plate, the two ends of the leaf spring are installed on the side of the vertical fixed support, the Y-shaped connecting rod includes a first rod, a second rod and a third rod; the first rod is hinged to the end of the pneumatic spring; the second rod is hinged to the end of the coil spring; the third rod is hinged to the middle connecting plate. In the above structure, the Y-shaped connecting rod is a three-dimensional connecting rod in space, and the first rod, the second rod and the third rod are arranged at an angle in space; it plays the role of transmitting the movement in the horizontal direction to the vertical plane, that is, the leaf spring is transmitted to the coil spring through the Y-shaped connecting rod in space. When the paddy field chassis is bumpy and vibrating, the nonlinear vibration damping structure arranged between the vertical fixed support and the middle connecting plate can absorb the vibration, reduce the stress concentration caused by the impact of the articulated steering system, and resist the torsion of the articulated steering system. At the same time, such a setting also makes the nonlinear vibration damping articulated steering structure very compact, and the nonlinear vibration damping articulated steering structure as a whole adopts a vertically symmetrical layout, and has a good energy absorption effect.

[0017] Preferably, the nonlinear vibration reduction structure is arranged between the vertical fixed support and the slewing bearing fixed support; the two ends of the leaf spring are installed on the side of the vertical fixed support, and the Y-shaped connecting rod includes a first support rod, a second support rod and a third support rod; the first support rod is hinged to the end of the pneumatic spring; the second support rod is hinged to the end of the coil spring; a sliding assembly is arranged between the Y-shaped connecting rod and the slewing bearing fixed support, and the sliding assembly includes a first guide rail fixed to the slewing bearing fixed support and a second guide rail slidably arranged on the first guide rail, and the third support rod is hinged on the second guide rail. In the above structure, the Y-shaped connecting rod is a three-dimensional connecting rod, and the first support rod, the second support rod and the third support rod are arranged at an angle in space; it plays the role of transmitting the movement in the horizontal direction to the vertical plane, that is, the leaf spring is transmitted to the coil spring through the Y-shaped connecting rod in space. By setting the sliding component, the smooth steering of the articulated steering system can be ensured. At the same time, the elastic force of the nonlinear vibration damping structure can act on the front articulated seat and the rear articulated seat. When the paddy field chassis is bumpy and vibrates, the nonlinear vibration damping structure can absorb the vibration caused by the front articulated seat and the rear articulated seat, reduce the stress concentration caused by the impact on the articulated steering system, resist the torsion of the articulated steering system, and have a stronger anti-torsion effect, thereby further improving the stability of the articulated steering.

[0018] Preferably, the first guide rail is in an arc shape, and the guide path of the first guide rail passes through the rotation center of the slewing bearing fixed support. When the articulated steering system is turning, the position of the second guide rail on the first guide rail can be adaptively adjusted, and the nonlinear vibration reduction structure can deflect to a certain extent along the direction of turning, so that the vibration of the rear articulated seat can be transmitted to the nonlinear vibration reduction structure more easily and quickly.

[0019] Preferably, the first guide rail is in an arc shape or an annular shape, and the center of the guide path of the first guide rail coincides with the rotation center of the slewing bearing fixed support. When the articulated steering system is turning, the first guide rail rotates with the slewing bearing fixed support. Since the center of the guide path of the first guide rail coincides with the rotation center of the slewing bearing fixed support, the position of the second guide rail can remain unchanged, so that the nonlinear vibration reduction structure will not be deformed, and it can play a good anti-impact effect in the event of bumps and vibrations.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The nonlinear vibration-damping articulated steering structure of the present invention reduces the impact of bumpy roads on the steering system and improves the smoothness of the articulated steering by providing a nonlinear vibration-damping structure.

[0022] 2. The nonlinear vibration-damping articulated steering structure of the present invention can resist the torsion caused by high-speed turning conditions or steering on uneven roads by providing a nonlinear vibration-damping structure, thereby improving the stability of the articulated steering.

[0023] 3. The nonlinear vibration-damping articulated steering structure of the present invention is a three-stage vibration-damping structure. The impact of the paddy field chassis driving process on the handover steering system is absorbed by the first-stage leaf spring, and the second-stage pneumatic spring is used for buffering and vibration reduction, and finally transmitted to the third-stage coil spring; through the stage-by-stage transmission, the vibration-damping performance of the articulated steering system is increased.

[0024] 4. The nonlinear vibration-damping articulated steering structure of the present invention transmits the horizontal vibration of the first-stage leaf spring to the vertical plane of the third-stage coil spring by setting a Y-shaped connecting rod, so that the vibration-damping structure has vibration-damping effects in both horizontal and vertical directions, thereby increasing the breadth of the nonlinear vibration-damping structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of a first specific implementation manner of a nonlinear vibration-damping articulated steering structure in the present invention.

[0026] Figure 2 It is a top view of a nonlinear vibration-damping articulated steering structure in the present invention.

[0027] Figure 3 This is an exploded view in the main viewing direction of a nonlinear vibration-damping articulated steering structure in the present invention.

[0028] Figure 4 It is an exploded view in the three-dimensional direction of a nonlinear vibration-damping articulated steering structure in the present invention.

[0029] Figure 5 It is a three-dimensional structural schematic diagram of the front articulated seat and the nonlinear vibration reduction structure in the present invention.

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the Y-shaped connecting rod in the present invention.

[0031] Figure 7 It is a top view of a second specific implementation of a nonlinear vibration-damping articulated steering structure in the present invention.

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of a second specific implementation manner of a nonlinear vibration-damping articulated steering structure in the present invention.

[0033] Fig. 9 It is a top view of a third specific implementation manner of a nonlinear vibration-damping articulated steering structure in the present invention.

[0034] Fig.10 It is a front view of a third specific implementation manner of a nonlinear vibration-damping articulated steering structure in the present invention.

[0035] Fig.11 It is a schematic diagram of the structure of the shock absorber in the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0037] Example 1

[0038] See also Figure 1 In this embodiment, a nonlinear vibration damping articulated steering structure is provided between a front half frame 1 and a rear half frame 2; the nonlinear vibration damping articulated steering structure includes an articulated steering system 4 and a nonlinear vibration damping structure 5 provided on the articulated steering system 4.

[0039] See also Figure 1-Figure 2 The articulated steering system 4 includes a front articulated seat 4-1 and a rear articulated seat 4-2; the front articulated seat 4-1 and the rear articulated seat 4-2 are articulatedly connected to each other; the front articulated seat 4-1 is connected to the front half frame 1, and the rear articulated seat 4-2 is connected to the rear half frame 2.

[0040] See also Figure 1-Figure 6 The nonlinear vibration damping structure 5 is a three-stage vibration damping structure, which is used to reduce the impact of bumpy road sections on the articulated steering system 4 and to resist the torsion caused by high-speed turning conditions or steering due to uneven roads; the nonlinear vibration damping structure 5 includes a leaf spring 5-1, a coil spring 5-2, a Y-shaped connecting rod 5-3 respectively arranged at both ends of the coil spring 5-2, and a pneumatic spring 5-4 arranged between each Y-shaped connecting rod 5-3 and the leaf spring 5-1; the coil spring 5-2 is horizontally arranged, one end of the Y-shaped connecting rod 5-3 is hinged to the end of the coil spring 5-2, the other end of the Y-shaped connecting rod 5-3 is hinged to one end of the pneumatic spring 5-4, and the other end of the pneumatic spring 5-4 is hinged to the leaf spring 5-1. The leaf spring 5-1 acts on the front articulated seat 4-1, and the Y-shaped connecting rod 5-3 can be connected to the front articulated seat 4-1 or the rear articulated seat 4-2; the Y-shaped connecting rod 5-3 in this embodiment is connected to the front articulated seat 4-1; in the above structure, the Y-shaped connecting rod 5-3 and the pneumatic spring 5-4 of the nonlinear vibration damping structure 5 are both two.

[0041] See also Figure 1-Figure 5The front articulated seat 4-1 includes a slewing support column 4-11, a vertical fixed support 4-12, an intermediate connecting plate 4-13 fixedly arranged between the slewing support column 4-11 and the vertical fixed support 4-12, and a trapezoidal connecting clamp 4-14 arranged on both sides of the slewing support column 4-11; there are two intermediate connecting plates 4-13, and the two intermediate connecting plates 4-13 are distributed up and down, and the vertical fixed support 4-12 is connected to the front half frame 1; the rear articulated seat 4-2 includes slewing bearing fixed supports 4-21 which are respectively arranged at the upper and lower ends of the front articulated seat 4-1 and are symmetrically arranged; each of the slewing bearing fixed supports 4-21 is connected to the slewing support column 4-11 through a slewing bearing 4-3, and the two slewing bearing fixed supports 4-21 are connected to the rear half frame 2. In the above structure, the head end of the slewing bearing 4-3 located at the upper end is fixedly connected to the upper end of the slewing support column 4-11, and the tail end of the slewing bearing 4-3 located at the upper end is fixedly connected to the slewing bearing fixed support 4-21 located at the upper end; the head end of the slewing bearing 4-3 located at the lower end is fixedly connected to the lower end of the slewing support column 4-11, and the tail end of the slewing bearing 4-3 located at the lower end is fixedly connected to the slewing bearing fixed support 4-21 located at the lower end; by setting the slewing bearing 4-3, relative rotation can be achieved between the front articulated seat 4-1 and the rear articulated seat 4-2. The specific structural setting of the above-mentioned front articulated seat 4-1 and the rear articulated seat 4-2 can make the steering system more compact and the structure more stable.

[0042] See also Figure 1-Figure 3 The trapezoidal connecting fixture 4-14 can improve the stability of the overall structure of the front articulated seat 4-1, and can also be used to install other accessories of the paddy field chassis.

[0043] See also Figure 1-Figure 5 The number of the nonlinear vibration reduction structures 5 is two groups, and the two groups of nonlinear vibration reduction structures 5 are symmetrically arranged in an upper and lower manner. By arranging two groups of nonlinear vibration reduction structures 5, a superposition effect is achieved, and the shock absorption and energy absorption effect is further improved, which plays a good protective role for the articulated steering system 4 and improves the stability of the articulated steering.

[0044] See also Figure 1-Figure 5 The two ends of the leaf spring 5-1 are connected to the vertical fixed support 4-12 through the hanging ears 5-5; the leaf spring 5-1 is arranged vertically and horizontally, and the leaf spring 5-1 protrudes toward the rear hinge seat 4-2. The purpose is to transfer the horizontal vibration of the first-stage leaf spring 5-1 to the vertical plane of the third-stage coil spring 5-2, so that the vibration reduction structure has the vibration reduction effect in both horizontal and vertical directions, and increases the width of the nonlinear vibration reduction structure 5.

[0045] See also Figure 1-Figure 5A first fixing ear 5-6 is provided between the leaf spring 5-1 and the pneumatic spring 5-4. One end of the first fixing ear 5-6 is fixedly connected to the leaf spring 5-1, and the other end is hinged to the pneumatic spring 5-4 through a pin.

[0046] See also Figure 1-Figure 4 A shock absorber 6 is provided between the two slewing bearing fixed supports 4-21, one end of the shock absorber 6 is connected to one of the slewing bearing fixed supports 4-21, and the other end of the shock absorber 6 is connected to the other slewing bearing fixed support 4-21. By providing the shock absorber 6, the vibration of the slewing bearing fixed support 4-21 can be absorbed, thereby ensuring the stability of the articulated steering.

[0047] See also Figure 1-Figure 4 and Fig.11 The shock absorber 6 includes an upper base 6-1, a lower base 6-2, a shock absorber body 6-3 arranged between the upper base 6-1 and the lower base 6-2, a main spring 6-4, a secondary spring 6-5, an intermediate spring cover 6-6 and a lower spring cover 6-7 mounted on the shock absorber body 6-3; the upper base 6-1 is arranged on a slewing bearing fixed support 4-21 located at the upper end, and the lower base 6-2 is arranged on a slewing bearing fixed support 4-21 located at the lower end; the upper end of the shock absorber body 6-3 acts on the upper base 6-1, and the lower end acts on the lower base 6-2; the upper end of the main spring 6-4 acts on the upper base 6-1, and the lower end acts on the intermediate spring cover 6-6; the upper end of the secondary spring 6-5 acts on the intermediate spring cover 6-6, and the lower end acts on the lower spring cover 6-7. In the above structure, the main and auxiliary springs 6-5 have high elastic restoring force, so that they have higher elastic restoring force and deformation under the same load-bearing capacity, and can effectively absorb the impact of road vibration and paddy field chassis weight; when the main spring 6-4 is not enough for vibration reduction, the auxiliary spring 6-5 will share the vibration reduction pressure of the main spring 6-4, and the main and auxiliary springs 6-5 are superimposed to expand the vibration reduction effect and improve the stability of the articulated steering system.

[0048] The lower base 6-2 is connected to the shock absorber body 6-3 via a fisheye bearing 6-8.

[0049] When working, the paddy field chassis drives into the paddy field from the ground. At this time, due to the low terrain of the paddy field, there will be a drop, which will bring impact to the articulated steering system 4 connected to the rear half frame; at the same time, the paddy field chassis drives in the paddy field, and due to the uneven environment of the paddy field, the paddy field chassis will be bumpy and vibrated. Therefore, the impact and vibration will first be transmitted to the slewing bearing fixed support 4-21 and the slewing bearing 4-3 at the upper end. At this time, the main spring 6-4 and the shock absorber body 6-3 connected to the slewing bearing fixed support 4-21 absorb the first wave of large impact and transmit it to the auxiliary spring 6-5 at the same time. At this time, the auxiliary spring 6-5 will buffer and absorb the remaining impact energy, reduce the influence of the vibration on the slewing bearing 4-3 in the articulated steering system 4, and make the articulated steering smooth and stable.

[0050] Due to the uneven environment of the paddy field, the paddy field chassis will tilt to a certain extent. When the paddy field chassis turns or makes a U-turn in the paddy field, the articulated steering system connected to the rear half frame will be subjected to impact and a certain degree of torsion. At this time, the impact and vibration will first be transmitted to the main spring 6-4 and the shock absorber body 6-3. At this time, the main spring 6-4 and the shock absorber body 6-3 connected to the upper end slewing bearing fixed support 4-21 will deform to absorb the first wave of large impact, and then be transmitted to the auxiliary spring 6-5. At this time, the auxiliary spring 6-5 will buffer, and at the same time, the fisheye bearing 6-8 connected to the lower base 6-2 will rotate with a certain margin to offset part of the impact caused by the torsion. Therefore, while reducing the stress concentration caused by the impact on the articulated steering system 4, it will also resist the torsion of the articulated steering system 4.

[0051] See also Figure 1-Figure 4 The number of the shock absorbers 6 is two, and by providing two shock absorbers 6, the vibration reduction effect is further improved.

[0052] See also Figure 1-Figure 6, the nonlinear vibration damping structure 5 is arranged between the vertical fixed support 4-12 and the intermediate connecting plate 4-13, and the two groups of nonlinear vibration damping structures 5 act on the two intermediate connecting plates 4-13 respectively; the two ends of the leaf spring 5-1 are installed on the side of the vertical fixed support 4-12, and the Y-shaped connecting rod 5-3 includes a first support rod 5-1, a second support rod 5-2 and a third support rod 5-3; the first support rod 5-1 and the end of the pneumatic spring 5-4 are hinged by a pin; the second support rod 5-2 and the end of the coil spring 5-2 are hinged; the third support rod 5-3 and the intermediate connecting plate 4-13 are hinged; a second fixing ear 5-7 is provided between the third support rod 5-3 and the intermediate connecting plate 4-13, the second fixing ear 5-7 is fixed on the intermediate connecting plate 4-13, and the third support rod 5-3 and the second fixing ear 5-7 are hinged by a pin. In the above structure, the Y-shaped connecting rod 5-3 is a three-dimensional connecting rod, and the first support rod 5-1, the second support rod 5-2 and the third support rod 5-3 are arranged at an angle in space; it plays the role of transmitting the movement in the horizontal direction to the vertical plane, that is, the leaf spring 5-1 is transmitted to the coil spring 5-2 through the Y-shaped connecting rod 5-3 in space. When the paddy field chassis is bumpy and vibrating, the nonlinear vibration reduction structure 5 arranged between the vertical fixed support 4-12 and the middle connecting plate 4-13 can absorb the vibration, reduce the stress concentration caused by the impact on the articulated steering system 4, and resist the torsion of the articulated steering system 4. At the same time, such an arrangement also makes the nonlinear vibration reduction articulated steering structure very compact, and the nonlinear vibration reduction articulated steering structure adopts an upper and lower symmetrical layout as a whole, which has a good energy absorption effect.

[0053] See also Figure 1-Figure 5 , the working principle of the above nonlinear vibration damping articulated steering structure is:

[0054] The leaf spring 5-1 constitutes the first-stage vibration reduction structure, the coil spring 5-2 constitutes the second-stage vibration reduction structure, and the coil spring 5-3 constitutes the third-stage vibration reduction structure; when working, the paddy field chassis drives into the paddy field from the ground. Due to the low terrain of the paddy field, there will be a drop, which will bring impact to the articulated steering system 4 connected between the front half frame 1 and the rear half frame 2; at the same time, the paddy field chassis travels in the paddy field. Due to the uneven environment of the paddy field, the paddy field chassis will be bumpy and vibrated; the impact and vibration will first be transmitted to the first-stage vibration reduction structure, at which time the leaf spring 5-1 will deform to absorb the first wave of large impact, and then be transmitted to the second-stage vibration reduction structure, at which time the pneumatic spring 5-4 will buffer and react on the spatial Y-shaped connecting rod 5-3 to transmit the impact to the third-stage vibration reduction structure, at which time the coil spring 5-2 will deform to absorb the remaining impact energy and reduce the stress concentration caused by the impact on the articulated steering system 4.

[0055] Due to the uneven environment of the paddy field, the paddy field chassis will tilt to a certain extent. When the paddy field chassis turns or makes a U-turn in the paddy field, the articulated steering system 4 will be subjected to impact and a certain degree of torsion. The impact and vibration will first be transmitted to the first-stage shock absorbing structure. At this time, the leaf spring 5-1 will be deformed to absorb the first wave of large impact, and then transmitted to the second-stage shock absorbing structure. At this time, the pneumatic spring 5-4 will buffer and react on the spatial Y-shaped connecting rod 5-3 to transmit the impact to the third-stage shock absorbing structure. At this time, the coil spring 5-2 will be deformed. Since the coil spring 5-2 is horizontally arranged, it will not only reduce the stress concentration caused by the impact on the articulated steering system 4, but also resist the torsion of the articulated steering system 4.

[0056] The paddy field chassis comprises a nonlinear vibration damping articulated steering structure, a front half frame 1 and a rear half frame 2.

[0057] Example 2

[0058] See also Figure 6-Figure 8 , the other structures in this embodiment are the same as those in embodiment 1, except that the nonlinear vibration damping structure 5 is arranged between the vertical fixed support 4-12 and the slewing bearing fixed support 4-21; the two ends of the leaf spring 5-1 are installed on the side of the vertical fixed support 4-12, and the Y-shaped connecting rod 5-3 includes a first support rod 5-1, a second support rod 5-2 and a third support rod 5-3; the first support rod 5-1 is hinged to the end of the pneumatic spring 5-4; the second support rod 5-2 is hinged to the end of the coil spring 5-2; a sliding assembly is provided between the Y-shaped connecting rod 5-3 and the slewing bearing fixed support 4-21, and the sliding assembly includes a first guide rail 7 fixed on the slewing bearing fixed support 4-21 and a second guide rail 8 slidably arranged on the first guide rail 7, and the third support rod 5-3 is hinged to the second guide rail 8, specifically, the third support rod 5-3 is hinged to the second guide rail 8 through a second fixing ear 5-7. In the above structure, the Y-shaped connecting rod 5-3 is a three-dimensional connecting rod, and the first support rod 5-1, the second support rod 5-2 and the third support rod 5-3 are arranged at an angle in space; the movement in the horizontal direction is transmitted to the vertical plane, that is, the leaf spring 5-1 is transmitted to the coil spring 5-2 through the Y-shaped connecting rod 5-3 in space. By setting the sliding assembly, the smooth steering of the articulated steering system 4 can be ensured, and at the same time, the elastic force of the nonlinear vibration reduction structure 5 can also act on the front articulated seat 4-1 and the rear articulated seat 4-2. When the paddy field chassis is bumpy and vibrated, the nonlinear vibration reduction structure 5 can absorb the vibration caused by the front articulated seat 4-1 and the rear articulated seat 4-2, reduce the stress concentration caused by the impact of the articulated steering system 4, and resist the torsion of the articulated steering system 4. The anti-torsion effect is stronger, and the stability of the articulated steering is further improved.

[0059] See also Figure 6-Figure 8 , the first guide rail 7 is in an arc shape, and the guide path of the first guide rail 7 passes through the rotation center of the slewing bearing fixed support 4-21. The first guide rail 7 is in an arc shape, that is, the guide path of the first guide rail 7 is also in an arc shape; when the articulated steering system 4 is turning, the position of the second guide rail 8 on the first guide rail 7 can be adaptively adjusted, and the nonlinear vibration reduction structure 5 can deflect to a certain extent along the direction of turning, so that the vibration of the rear articulated seat 4-2 is more easily and quickly transmitted to the nonlinear vibration reduction structure 5.

[0060] See also Figure 6-Figure 8 The first guide rail 7 is provided with a groove, and the second guide rail 8 is provided with a protrusion, and the groove and the protrusion slide and cooperate with each other to play a guiding role. The sliding assembly can also adopt a structure in which the guide rail and the guide groove cooperate with each other, and the guide groove is directly set on the slewing bearing fixed support 4-21, and the guide rail and the guide groove slide and cooperate, and the third support rod 5-3 is hinged on the guide rail. This structure is more compact.

[0061] Example 3

[0062] See also Figure 6 and Figure 9-10 , the other structures in this embodiment are the same as those in Embodiment 2, except that the first guide rail 7 is in an arc shape or an annular shape, and the center of the guide path of the first guide rail 7 coincides with the rotation center of the slewing bearing fixed support 4-21; the second guide rail 8 in this embodiment is also in an arc shape. The first guide rail 7 is in an arc shape or an annular shape, that is, the guide path of the first guide rail 7 is also in an arc shape or a circle; when the articulated steering system 4 is turned, the first guide rail 7 rotates with the slewing bearing fixed support 4-21, and since the center of the guide path of the first guide rail 7 coincides with the rotation center of the slewing bearing fixed support 4-21, the position of the second guide rail 8 can remain unchanged, so that the nonlinear vibration damping structure 5 will not be deformed, and can play a good anti-impact effect in the event of bumps and vibrations.

[0063] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A nonlinear vibration-damping articulated steering structure, characterized in that: The nonlinear vibration damping articulated steering structure is arranged between the front half frame and the rear half frame; the nonlinear vibration damping articulated steering structure comprises an articulated steering system and a nonlinear vibration damping structure arranged on the articulated steering system; wherein, The articulated steering system comprises a front articulated seat and a rear articulated seat; the front articulated seat and the rear articulated seat are articulatedly connected to each other; the front articulated seat is connected to the front half frame, and the rear articulated seat is connected to the rear half frame; The nonlinear vibration damping structure is a three-stage vibration damping structure, which is used to reduce the impact of bumpy road sections on the articulated steering system and to resist the torsion caused by high-speed turning conditions or steering due to uneven roads; the nonlinear vibration damping structure includes a leaf spring, a coil spring, a Y-shaped connecting rod respectively arranged at both ends of the coil spring, and a pneumatic spring arranged between each Y-shaped connecting rod and the leaf spring; the coil spring is arranged horizontally, one end of the Y-shaped connecting rod is hinged to the end of the coil spring, the other end of the Y-shaped connecting rod is hinged to one end of the pneumatic spring, and the other end of the pneumatic spring is hinged to the leaf spring.

2. The nonlinear vibration damping articulated steering structure according to claim 1, characterized in that: The front articulated seat includes a swivel support column, a vertical fixed support, an intermediate connecting plate fixedly arranged between the swivel support column and the vertical fixed support, and a trapezoidal connecting clamp arranged on both sides of the swivel support column; there are two intermediate connecting plates, which are distributed up and down, and the vertical fixed support is connected to the front half frame; the rear articulated seat includes swivel bearing fixed supports which are respectively arranged at the upper and lower ends of the front articulated seat and are symmetrically arranged; each of the swivel bearing fixed supports is connected to the swivel support column through a swivel bearing, and two of the swivel bearing fixed supports are connected to the rear half frame.

3. The nonlinear vibration damping articulated steering structure according to claim 2, characterized in that: The number of the nonlinear vibration reduction structures is two groups, and the two groups of nonlinear vibration reduction structures are symmetrically arranged in an upper and lower manner.

4. The nonlinear vibration damping articulated steering structure according to claim 2, characterized in that: A shock absorber is arranged between the two slewing bearing fixed supports, one end of the shock absorber is connected to one of the slewing bearing fixed supports, and the other end of the shock absorber is connected to the other slewing bearing fixed support.

5. The nonlinear vibration-damping articulated steering structure according to claim 4, characterized in that: The shock absorber includes an upper base, a lower base, a shock absorber body arranged between the upper base and the lower base, a main spring, a secondary spring, an intermediate spring cover and a lower spring cover sleeved on the shock absorber body; the upper base is arranged on a slewing bearing fixed support located at the upper end, and the lower base is arranged on a slewing bearing fixed support located at the lower end; the upper end of the shock absorber body acts on the upper base, and the lower end acts on the lower base; the upper end of the main spring acts on the upper base, and the lower end acts on the intermediate spring cover; the upper end of the secondary spring acts on the intermediate spring cover, and the lower end acts on the lower spring cover.

6. The nonlinear vibration-damping articulated steering structure according to claim 2, characterized in that: The nonlinear vibration damping structure is arranged between the vertical fixed support and the middle connecting plate, the two ends of the leaf spring are installed on the side of the vertical fixed support, the Y-shaped connecting rod includes a first support rod, a second support rod and a third support rod; the first support rod is hinged to the end of the pneumatic spring; the second support rod is hinged to the end of the coil spring; the third support rod is hinged to the middle connecting plate.

7. The nonlinear vibration-damping articulated steering structure according to claim 2, characterized in that: The nonlinear vibration damping structure is arranged between the vertical fixed support and the slewing bearing fixed support; the two ends of the leaf spring are installed on the side of the vertical fixed support, and the Y-shaped connecting rod includes a first support rod, a second support rod and a third support rod; the first support rod is hinged to the end of the pneumatic spring; the second support rod is hinged to the end of the coil spring; a sliding assembly is provided between the Y-shaped connecting rod and the slewing bearing fixed support, and the sliding assembly includes a first guide rail fixed on the slewing bearing fixed support and a second guide rail slidably arranged on the first guide rail, and the third support rod is hinged to the second guide rail.

8. The nonlinear vibration-damping articulated steering structure according to claim 7, characterized in that: The first guide rail is in an arc shape, and a guide path of the first guide rail passes through the rotation center of the slewing bearing fixed support.

9. The nonlinear vibration-damping articulated steering structure according to claim 7, characterized in that: The first guide rail is in an arc shape or an annular shape, and the center of the guide path of the first guide rail coincides with the rotation center of the slewing bearing fixed support.

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