Steering assist system, steering assist method, and application thereof in a hydraulic truck

Abstract

The application discloses a kind of steering assist system, steering assist method and its application in hydraulic transport vehicle, it is related to steering assist system field.The present application can adjust the transmission ratio between transmission member and transmission wheel set by adjusting the transmission radius of transmission wheel set, thereby adjusting the hydraulic pressure size that hydraulic pump outputs, further adjust the size of steering assist that hydraulic assist assembly outputs, so that hydraulic assist system provides suitable steering assist for vehicle steering, can improve the assist effect of steering assist system and the driving experience of vehicle;And when the load of vehicle increases, the transmission radius of transmission wheel set is directly adjusted correspondingly by the cooperation of chassis and telescopic adjusting assembly extruded downward, to adjust the size of steering assist, without manually adjusting steering assist according to the size of vehicle load, so that the adjustment process of steering assist is more convenient and fast.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of steering assist system, and particularly relates to a steering assist system, a steering assist method and application thereof in hydraulic carrier. BACKGROUND

[0002] The hydraulic steering assist system is used for providing assist force for vehicle steering, and mainly comprises a mechanical part and a hydraulic assist device. The mechanical part comprises a power steering gear, a steering transmission pair, a steering rocker, a steering drag link, a steering tie rod and a steering knuckle, etc. The hydraulic assist device comprises a hydraulic pump, a hydraulic cylinder, a hydraulic control valve, an oil tank and a pipeline, etc.

[0003] The hydraulic assist device is communicated with the power steering gear, and the hydraulic pump is drivingly connected with the engine of the vehicle through a transmission system. When the vehicle is running, the hydraulic pump is driven by the engine to work synchronously, so that the hydraulic assist device provides hydraulic pressure for the power steering gear as steering assist force. However, when the vehicle has a small load, the pressure on the wheel is small, and the degree of extrusion deformation is small. At this time, the frictional resistance between the wheel and the ground is small, and the vehicle steering is more labor-saving. When the vehicle has a large load, the pressure on the wheel is large, and the degree of extrusion deformation is large. At this time, the frictional resistance between the wheel and the ground is increased, and the vehicle steering is more labor-consuming. Therefore, when the hydraulic steering assist system is applied to the hydraulic carrier, the truck and other vehicles, because the load of the vehicle is greatly different between the process of loading and transporting goods and the process of emptying the vehicle, the steering resistance of the vehicle will change accordingly. At this time, the steering assist force provided by the hydraulic assist device cannot be adjusted accordingly, thereby reducing the assist effect of the steering assist system and the driving experience of the vehicle. SUMMARY

[0004] In view of the problems in the related art, the present application provides a steering assist system, a steering assist method and application thereof in a hydraulic carrier, to overcome the above technical problems in the prior art.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application is a steering assist system, comprising an axle, which is installed below the chassis of a vehicle through a damping frame, a steering assist mechanism and a transmission mechanism.

[0007] The steering assisting mechanism comprises a wheel hub seat, a hydraulic assisting assembly and a steering assembly, the wheel hub seat is rotatably installed on the end of the axle, the steering assembly is drivingly connected with the wheel hub seat through the hydraulic assisting assembly, the hydraulic assisting assembly is installed on the top of the vehicle chassis and drivingly connected with the engine of the vehicle through a transmission mechanism; when the engine of the vehicle is working, the hydraulic assisting assembly is synchronously driven by the transmission mechanism to provide hydraulic power for the steering assembly;

[0008] The transmission mechanism comprises a transmission member, a transmission wheel set and an extension adjusting assembly, the transmission wheel set is drivingly installed on the hydraulic assisting assembly and drivingly connected with the engine of the vehicle through the transmission member, the extension adjusting assembly is installed between the transmission wheel set and the axle;

[0009] When the load of the vehicle is increased, the vehicle chassis is pressed to go down and drives the hydraulic assisting assembly to synchronously go down, at this time, the extension adjusting assembly is squeezed to contract, and in the contraction process, the transmission radius of the transmission wheel set is contracted to reduce, so as to increase the transmission ratio between the transmission member and the transmission wheel set.

[0010] Further, the steering assembly comprises a steering wheel and a hydraulic steering device, the hydraulic steering device is installed on the axle, a rotating shaft is drivingly installed on the input end of the hydraulic steering device, and the bottom end of the steering wheel is movably connected with the rotating shaft.

[0011] A tie rod is drivingly installed on the output end of the hydraulic steering device, and the end of the tie rod is rotatably connected with the wheel hub seat through a knuckle arm.

[0012] Further, the hydraulic assisting assembly comprises a hydraulic pump and an oil tank, the hydraulic pump and the oil tank are fixedly installed on the top of the vehicle chassis, the hydraulic pump, the oil tank and the hydraulic steering device are sequentially connected through hydraulic pipes to form a circulating oil path.

[0013] Further, the transmission member comprises a driving wheel and a transmission belt, the driving wheel is drivingly connected with the engine of the vehicle.

[0014] The transmission wheel set is drivingly connected with the hydraulic pump, and the driving wheel is drivingly connected with the transmission wheel set through the transmission belt.

[0015] Further, the transmission wheel set comprises a hydraulic disc and a driving shaft, the driving shaft is rotatably installed on one end of the hydraulic pump, the inner end of the driving shaft extends into the hydraulic pump and is drivingly connected with a hydraulic wheel, and the outer end of the driving shaft is fixedly installed with the hydraulic disc.

[0016] A plurality of hydraulic shafts are fixedly installed on the outer ring of the hydraulic disc in the circumferential direction, a telescopic shaft is slidingly installed on the end of the hydraulic shaft, a roller seat is fixedly installed on the end of the telescopic shaft, and a transmission wheel is fixedly installed on the roller seat.

[0017] Further, the telescopic adjustment assembly comprises a hydraulic cylinder, a driving rack and an adapter ring, the adapter ring is rotationally installed on the driving shaft, and one end of the adapter ring is rotationally connected with the hydraulic disc;

[0018] The hydraulic cylinder is fixedly connected with the bottom end of the adapter ring, and the hydraulic cylinder is fixedly installed on the vehicle chassis, a lifting shaft is slidingly installed at the bottom end of the hydraulic cylinder, and a driven rack is fixedly installed at the bottom end of the lifting shaft;

[0019] A support is fixedly installed at the outer ring of the hydraulic cylinder, a gear rotationally installed at the bottom end of the support is in meshing transmission connection with the driven rack, and the driving rack is installed at the upper end of the axle and is in meshing transmission connection with the gear.

[0020] Further, a first hydraulic cavity is formed in the hydraulic cylinder, a second hydraulic cavity is formed in the adapter ring, a third hydraulic cavity is formed in the hydraulic disc, and a fourth hydraulic cavity is formed in the hydraulic shaft, the top end of the first hydraulic cavity is in communication with the second hydraulic cavity, the second hydraulic cavity and the third hydraulic cavity are in communication through a guide groove, and the third hydraulic cavity and the fourth hydraulic cavity are in communication;

[0021] A piston is slidingly installed in the first hydraulic cavity, and the piston and the top end of the lifting shaft are elastically connected through a damping spring.

[0022] Further, an adjusting mechanism is further installed on the axle, the adjusting mechanism comprises a support shaft, the support shaft is fixedly installed at the upper end of the axle, a lifting sliding block is slidingly inserted at the top end of the support shaft, and the top end of the lifting sliding block is fixedly connected with the bottom end of the driving rack;

[0023] A lead screw is threadedly and transmissionally installed at the bottom end of the lifting sliding block, a driven bevel gear is fixedly installed at the bottom end of the lead screw, an adjusting shaft is rotationally installed at one side of the bottom end of the support shaft, a driving bevel gear in transmission connection with the driven bevel gear is fixedly installed at one end of the adjusting shaft, and an adjusting hand wheel is fixedly installed at the other end of the adjusting shaft.

[0024] The application further discloses a steering assisting method of a steering assisting system, which comprises the following steps:

[0025] S1: when the vehicle is running, the engine drives the hydraulic assisting assembly to work through the cooperation of the transmission member and the transmission wheel set;

[0026] S2: when the steering assembly drives the hub seat to steer, the hydraulic assisting assembly provides steering assisting force for the steering assembly;

[0027] S3: when the vehicle load increases, the vehicle chassis is pressed down, and the hydraulic power assisting assembly is driven to move down synchronously, at this time, the telescopic adjusting assembly is squeezed to shrink, and in the shrinking process, the transmission radius of the transmission wheel set is reduced to increase the transmission ratio between the transmission member and the transmission wheel set, thereby increasing the hydraulic pressure of the hydraulic power assisting assembly to increase the steering assistance provided by the hydraulic power assisting assembly for the steering assembly.

[0028] The present application has the following advantages:

[0029] 1. In the present application, the hydraulic pump is connected with the engine of the vehicle through the transmission wheel set and the transmission member, and the transmission wheel set is an adjustable transmission wheel set, which can adjust the transmission radius of the transmission wheel set according to the demand of the vehicle for steering assistance, thereby adjusting the transmission ratio between the transmission member and the transmission wheel set to adjust the hydraulic pressure output by the hydraulic pump, and further adjust the size of the steering assistance output by the hydraulic power assisting assembly, so that the hydraulic power assisting system can provide appropriate steering assistance for the vehicle steering, and the assistance effect of the steering assistance system and the driving experience of the vehicle can be improved.

[0030] 2. In the present application, when the vehicle load increases, the vehicle chassis is pressed down, and the hydraulic power assisting assembly is driven to move down synchronously, at this time, the telescopic adjusting assembly is squeezed to shrink, and in the shrinking process, the transmission radius of the transmission wheel set is reduced to increase the transmission ratio between the transmission member and the transmission wheel set, thereby increasing the output power of the hydraulic pump and the steering assistance; without manually adjusting the steering assistance according to the size of the vehicle load, the adjustment process of the steering assistance is more convenient and fast.

[0031] 3. In the present application, the initial transmission radius of the transmission wheel set can be adjusted manually through the adjusting mechanism, thereby adjusting the initial output of the hydraulic pressure and the steering assistance of the hydraulic power assisting assembly, so that the user can adjust the size of the initial steering assistance of the steering assistance system according to his own driving habits when driving the vehicle, and the driving experience of the vehicle is further improved.

[0032] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, the drawings obtained from these drawings can also be obtained without creative labor.

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the steering assistance system of the present application;

[0035] Figure 2 It is a schematic diagram of the three-dimensional structure of the steering assistance system of the present application;Figure 1 A magnified schematic diagram of the structure at point A;

[0036] Figure 3 This is a three-dimensional cross-sectional structural diagram of the power steering system of the present invention;

[0037] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B;

[0038] Figure 5 This is a three-dimensional structural schematic diagram of the transmission mechanism of the present invention;

[0039] Figure 6 This is a three-dimensional cross-sectional structural diagram of the transmission mechanism of the present invention;

[0040] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point C;

[0041] Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at point D.

[0042] In the diagram: 1. Axle; 2. Power steering mechanism; 21. Steering wheel; 22. Shaft; 23. Hydraulic pump; 24. Oil tank; 25. Hydraulic steering gear; 26. Tie rod; 27. Wheel hub; 28. Steering knuckle arm; 29. ​​Hydraulic pipe; 3. Transmission mechanism; 31. Drive pulley; 32. Drive belt; 33. Hydraulic disc; 34. Hydraulic shaft; 35. Telescopic shaft; 36. Roller seat; 37. Drive pulley; 38. Hydraulic cylinder; 39. Lifting shaft; 310. Driven rack; 11. Bracket; 312. Gear; 313. Drive rack; 314. Drive shaft; 315. Adapter ring; 316. Hydraulic chamber 1; 317. Piston; 318. Damping spring; 319. Hydraulic chamber 2; 320. Guide groove; 321. Hydraulic chamber 3; 322. Hydraulic chamber 4; 4. Adjustment mechanism; 41. Support shaft; 42. Lifting slider; 43. Lead screw; 44. Driven bevel gear; 45. Driven bevel gear; 46. Adjustment shaft; 47. Adjustment handwheel. Detailed Implementation

[0043] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0044] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner" and the like indicate the orientation or positional relationship, only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the invention.

[0045] Please refer to Figure 1 As shown in the drawings, the present application is a kind of steering assist system, including axle 1, which is installed below the vehicle chassis through the shock absorber, and steering assist mechanism 2 and transmission mechanism 3; Steering assist mechanism 2 includes hub seat 27, hydraulic assist assembly and steering assembly, hub seat 27 is rotatably mounted on the end of axle 1, steering assembly is drivingly connected with hub seat 27 through hydraulic assist assembly, hydraulic assist assembly is installed on the top of vehicle chassis, and is drivingly connected with the engine of vehicle through transmission mechanism 3; When the vehicle engine works, hydraulic assist assembly is driven to work synchronously through transmission mechanism 3, so as to provide hydraulic power for steering assembly; Transmission mechanism 3 includes transmission member, transmission wheel set, telescopic adjusting assembly, transmission wheel set is drivingly installed on hydraulic assist assembly, and is drivingly connected with vehicle engine through transmission member, telescopic adjusting assembly is installed between transmission wheel set and axle 1; When the load of vehicle increases, the vehicle chassis is pressed down, and drives hydraulic assist assembly to go down synchronously, at this time, telescopic adjusting assembly is extruded and shrunk, and the transmission radius of transmission wheel set is driven to shrink and reduce in the shrinking process, so as to increase the transmission ratio between transmission member and transmission wheel set;

[0046] Specifically, when the vehicle is running, the engine drives hydraulic assist assembly to work through the cooperation of transmission member and transmission wheel set to generate hydraulic pressure; When the steering assembly drives hub seat 27 to turn, hydraulic assist assembly provides steering assist for steering assembly through hydraulic pressure, so that the vehicle turning process is more relaxed; When the load of vehicle increases and the steering resistance increases, the vehicle chassis is pressed down, and drives hydraulic assist assembly to go down synchronously, at this time, telescopic adjusting assembly is extruded and shrunk, and the transmission radius of transmission wheel set is driven to shrink and reduce in the shrinking process, so as to increase the transmission ratio between transmission member and transmission wheel set, so that the vehicle engine drives hydraulic assist assembly to rotate faster through the transmission cooperation of transmission member and transmission wheel set, and then improves the hydraulic pressure of hydraulic assist assembly, so as to improve the steering assist provided by hydraulic assist assembly for steering assembly, so that the steering assist increases synchronously with the steering resistance of vehicle, so as to offset the increased steering resistance, so that the vehicle turning is more relaxed;

[0047] The present application can adjust the transmission ratio between the transmission member and the transmission wheel set by adjusting the transmission radius of the transmission wheel set, thereby adjusting the hydraulic pressure output by the hydraulic power assembly and the size of the steering assist, so that the hydraulic power system provides appropriate steering assist for vehicle steering, and the assist effect of the steering power system and the driving experience of the vehicle are improved; and when the load of the vehicle increases, the transmission radius of the transmission wheel set is directly adjusted by the cooperation of the chassis and the telescopic adjusting assembly pressed downward, so as to adjust the size of the steering assist, without the need for manual adjustment of the steering assist according to the size of the vehicle load, so that the adjustment process of the steering assist is more convenient and fast.

[0048] Please refer to Figure 1 As shown in the figure, in one embodiment, the steering assembly includes a steering wheel 21 and a hydraulic steering gear 25, the hydraulic steering gear 25 is installed on the axle 1, the input end of the hydraulic steering gear 25 is drivingly installed with a rotating shaft 22, the bottom end of the steering wheel 21 is movably connected with the rotating shaft 22; the output end of the hydraulic steering gear 25 is drivingly installed with a tie rod 26, the end of the tie rod 26 is rotatably connected with the hub seat 27 through a knuckle arm 28;

[0049] When the vehicle is steering, the steering wheel 21 is rotated, so that the steering wheel 21 drives the hydraulic steering gear 25 to rotate and work through the rotating shaft 22, when the hydraulic steering gear 25 rotates and works, the output end of the hydraulic steering gear 25 drives the tie rod 26 to move to the rotation direction of the steering wheel 21, and then the hub seat 27 is pulled to rotate in the rotation direction of the steering wheel 21 through the tie rod 26.

[0050] Please refer to Figure 1 、 Figure 2 As shown in the figure, in one embodiment, the hydraulic power assembly includes a hydraulic pump 23 and an oil tank 24, the hydraulic pump 23 and the oil tank 24 are fixedly installed on the top of the vehicle chassis, the hydraulic pump 23, the oil tank 24 and the hydraulic steering gear 25 are connected in sequence through a hydraulic pipe 29 to form a circulating oil path;

[0051] When the hydraulic pump 23 works, the hydraulic oil is driven to circulate in the circulating oil path formed by the hydraulic pump 23, the oil tank 24, the hydraulic steering gear 25 and the hydraulic pipe 29 in sequence, and when the hydraulic oil flows through the hydraulic steering gear 25, the hydraulic pressure is provided for the hydraulic steering gear 25 to assist the hydraulic steering gear 25 to drive steering;

[0052] Among them, the hydraulic steering gear 25 adopts the existing center steering gear, and the working principle is not described in detail, and the greater the hydraulic pressure of the hydraulic steering gear 25, the greater the steering assist.

[0053] Please refer to Figure 2As shown, in one embodiment, the transmission member includes a driving wheel 31 and a transmission belt 32, the driving wheel 31 is in driving connection with the engine of the vehicle; the transmission wheel set is in driving connection with the hydraulic pump 23, the driving wheel 31 and the transmission wheel set are in driving connection through the transmission belt 32;

[0054] When the engine of the vehicle drives the driving wheel 31 to rotate, the driving wheel 31 drives the transmission wheel set to rotate through the transmission belt 32, and then the transmission wheel set drives the hydraulic pump 23 to rotate and work, and the hydraulic oil is driven by the hydraulic pump 23 to circulate in the circulating oil circuit;

[0055] Further, a tension wheel is installed on the running path of the transmission belt 32 through the spring telescopic shaft, and the transmission belt 32 is abutted and tensioned by the tension wheel, so that the transmission belt 32 is in a taut state.

[0056] Please refer to Figure 2 As shown, in one embodiment, the transmission wheel set includes a hydraulic disc 33 and a driving shaft 314, the driving shaft 314 is rotatably installed at one end of the hydraulic pump 23, the inner side end of the driving shaft 314 extends into the interior of the hydraulic pump 23 and is in driving connection with the hydraulic wheel, and the outer side end of the driving shaft 314 is fixedly installed with the hydraulic disc 33; a plurality of hydraulic shafts 34 are fixedly installed along the outer circle of the hydraulic disc 33, the end of the hydraulic shaft 34 is slidably installed with a telescopic shaft 35, the end of the telescopic shaft 35 is fixedly installed with a roller seat 36, and the roller seat 36 is fixedly installed with a transmission wheel 37;

[0057] Among them, a plurality of transmission wheels 37 are distributed in a circle along the outer circle of the hydraulic disc 33, so as to form a circular transmission structure on the outer circle of the hydraulic disc 33, which is used for driving connection with the transmission belt 32, the hydraulic shaft 34 and the telescopic shaft 35 are slidably connected to form a hydraulic telescopic shaft, when the hydraulic disc 33 pumps hydraulic oil into the hydraulic telescopic shaft, the hydraulic telescopic shaft is extruded and elongated, at this time, the transmission radius of the circular transmission structure is increased, and when the hydraulic disc 33 pumps the hydraulic oil in the hydraulic telescopic shaft, the hydraulic telescopic shaft is contracted and the length is reduced, at this time, the transmission radius of the circular transmission structure is reduced.

[0058] Please refer to Figures 3-8As shown, in one embodiment, the telescopic adjusting assembly comprises a hydraulic cylinder 38, a driving rack 313 and an adapter ring 315, the adapter ring 315 is rotatably installed on the driving shaft 314, and one end of the adapter ring 315 is rotatably connected with the hydraulic disc 33; the hydraulic cylinder 38 is fixedly connected to the bottom end of the adapter ring 315, and the hydraulic cylinder 38 is fixedly installed on the vehicle chassis, the bottom end of the hydraulic cylinder 38 is slidably installed with a lifting shaft 39, and the bottom end of the lifting shaft 39 is fixedly installed with a driven rack 310; the outer ring of the hydraulic cylinder 38 is fixedly installed with a bracket 311, the bottom end of the bracket 311 is rotatably installed with a gear 312 which is in meshing transmission connection with the driven rack 310; the driving rack 313 is installed on the upper end of the axle 1 and is in meshing transmission connection with the gear 312; a first hydraulic cavity 316 is formed in the hydraulic cylinder 38, a second hydraulic cavity 319 is formed in the adapter ring 315, a third hydraulic cavity 321 is formed in the hydraulic disc 33, and a fourth hydraulic cavity 322 is formed in the hydraulic shaft 34; the top end of the first hydraulic cavity 316 is in communication with the second hydraulic cavity 319, the second hydraulic cavity 319 and the third hydraulic cavity 321 are in communication through a guide groove 320, and the third hydraulic cavity 321 and the fourth hydraulic cavity 322 are in communication;

[0059] When the vehicle load increases and the chassis is pressed downward, the hydraulic pump 23, the hydraulic cylinder 38 and the gear 312 are driven to move downward synchronously, at this time, the driving rack 313 drives the downward gear 312 to rotate counterclockwise, and the counterclockwise rotating gear 312 drives the driven rack 310 to move downward, so that the lifting shaft 39 is driven by the driven rack 310 to gradually move downward from the first hydraulic cavity 316 in the hydraulic cylinder 38, so that the hydraulic oil in the hydraulic cavity is gradually pumped into the first hydraulic cavity 316, at the same time, since the first hydraulic cavity 316, the second hydraulic cavity 319, the third hydraulic cavity 321 and the fourth hydraulic cavity 322 are in communication in sequence, the hydraulic oil in the fourth hydraulic cavity 322 is gradually pumped out, and then the telescopic shaft 35 slides into the fourth hydraulic cavity 322 under the action of negative pressure suction, so that the overall length of the hydraulic telescopic shaft is reduced, and the transmission radius of the circular transmission structure is reduced.

[0060] Please refer to Figure 6 、 Figure 7 As shown, in one embodiment, a piston 317 is slidably installed in the first hydraulic cavity 316, and the piston 317 and the top end of the lifting shaft 39 are elastically connected through a damping spring 318; when the lifting shaft 39 slides up and down in the first hydraulic cavity 316, the piston 317 is driven by the damping spring 318 to slide up and down in the first hydraulic cavity 316, so that the hydraulic oil is pumped into or out of the first hydraulic cavity 316 through the piston 317 to adjust the transmission radius of the circular transmission structure;

[0061] When the vehicle bounces and the chassis is shaken up and down, the lifting shaft 39 will slide up and down in the first hydraulic cavity 316 during the up-and-down movement of the chassis. At this time, due to the buffering delay characteristics of the damping spring 318, the piston 317 can remain stationary during the up-and-down movement of the lifting shaft 39 due to vehicle vibration, so as not to make corresponding adjustments to the reduction of the transmission radius of the circular transmission structure, and further not to affect the size of the steering assist force of the steering assist system, so that the steering assist process of the steering assist system is more stable.

[0062] Please refer to Figure 1 、 Figure 3 、 Figure 4 It is shown that in one embodiment, the axle 1 is also provided with an adjusting mechanism 4, which includes a support shaft 41 fixedly installed on the upper end of the axle 1, a lifting block 42 slidingly installed on the top end of the support shaft 41, and the bottom end of the lifting block 42 is fixedly connected with the bottom end of the driving rack 313; a lead screw 43 is threadedly connected with the bottom end of the lifting block 42, a driven bevel gear 44 is fixedly installed on the bottom end of the lead screw 43, an adjusting shaft 46 is rotatably installed on one side of the bottom end of the support shaft 41, a driving bevel gear 45 is fixedly installed on one end of the adjusting shaft 46 and is in transmission connection with the driven bevel gear 44, and an adjusting hand wheel 47 is fixedly installed on the other end of the adjusting shaft 46.

[0063] When the adjusting hand wheel 47 is rotated, the driving bevel gear 45 is driven to rotate by the adjusting shaft 46, and then the driven bevel gear 44 is driven to rotate by the driving bevel gear 45, so that the lead screw 43 is driven to rotate by the driven bevel gear 44, and the lifting block 42 is driven to move up and down in the support shaft 41 by the lead screw 43 during the rotation, so as to drive the driving rack 313 to move up and down, and the driving rack 313 drives the driven rack 310 to move up and down in the opposite direction by the gear 312 during the up-and-down movement, so as to drive the lifting shaft 39 to move up and down, and the transmission radius of the circular transmission structure is adjusted by the hydraulic force during the up-and-down movement.

[0064] The initial transmission radius of the circular transmission structure is adjusted by the adjusting mechanism 4, and then the initial output hydraulic pressure of the hydraulic assist assembly and the steering assist force are adjusted, so that the user can adjust the size of the initial steering assist force of the steering assist system according to his own driving habit when driving the vehicle, and further improve the driving experience of the vehicle.

[0065] Please refer to Figures 1-8 It is shown that in one embodiment, a kind of steering assist system is disclosed in the application of hydraulic carrier, specifically, including the following steering assist steps:

[0066] S1: when the vehicle is running, the engine drives the hydraulic assist assembly to work by the cooperation of transmission member and transmission wheel set;

[0067] S2: When the steering assembly drives the hub 27 to steer, the hydraulic assist assembly provides steering assist for the steering assembly;

[0068] S3: When the vehicle load increases, the vehicle chassis is pressed down, and the hydraulic assist assembly is synchronously pressed down, at this time the telescopic adjusting assembly is squeezed and shrunk, and in the process of shrinking, the transmission radius of the transmission wheel set is shrunk and reduced, so as to increase the transmission ratio between the transmission member and the transmission wheel set, and further improve the hydraulic pressure of the hydraulic assist assembly, so as to improve the steering assist provided by the hydraulic assist assembly for the steering assembly.

[0069] In the description of the present specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the invention. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above disclosed preferred embodiments of the invention are only used to help explain the invention. The preferred embodiments do not describe all the details, nor limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can well understand and utilize the invention.

Claims

1. A power steering system, comprising an axle mounted under a vehicle chassis via a shock absorber bracket, characterized in that: It also includes the power steering mechanism and the transmission mechanism; The power steering mechanism includes a wheel hub, a hydraulic power steering component, and a steering component. The wheel hub is rotatably mounted on the end of the axle. The steering component is connected to the wheel hub via the hydraulic power steering component. The hydraulic power steering component is mounted on the top of the vehicle chassis and is connected to the vehicle's engine via a transmission mechanism. When the vehicle engine is running, the transmission mechanism drives the hydraulic power steering component to work synchronously, so that the hydraulic power steering component provides hydraulic power to the steering component. The transmission mechanism includes a transmission component, a transmission wheel set, and a telescopic adjustment component. The transmission wheel set is driven and mounted on the hydraulic power assist component and is connected to the vehicle engine through the transmission component. The telescopic adjustment component is installed between the transmission wheel set and the axle. When the vehicle load increases, the vehicle chassis is pressed down and drives the hydraulic power assist component to move down synchronously. At this time, the telescopic adjustment component is squeezed and contracted, and during the contraction process, the transmission radius of the drive wheel set is reduced to increase the transmission ratio between the transmission component and the drive wheel set. The transmission component includes a drive pulley and a transmission belt, and the drive pulley is connected to the vehicle engine in a transmission connection. The hydraulic power assist assembly includes a hydraulic pump, the transmission wheel assembly is connected to the hydraulic pump, and the drive wheel is connected to the transmission wheel assembly via a transmission belt. The transmission wheel assembly includes a hydraulic disc and a drive shaft. The drive shaft is rotatably mounted on one end of the hydraulic pump. The inner end of the drive shaft extends into the interior of the hydraulic pump and is connected to the hydraulic wheel transmission. The hydraulic disc is fixedly mounted on the outer end of the drive shaft. Multiple hydraulic shafts are fixedly installed on the outer ring of the hydraulic disc along the circumferential direction. A telescopic shaft is slidably installed on the end of the hydraulic shaft. A roller seat is fixedly installed on the end of the telescopic shaft. A transmission wheel is fixedly installed on the roller seat. The telescopic adjustment assembly includes a hydraulic cylinder, a drive rack, and an adapter ring. The adapter ring is rotatably mounted on the drive shaft, and one end of the adapter ring is rotatably connected to the hydraulic disc. The hydraulic cylinder is fixedly connected to the bottom end of the adapter ring and is fixedly installed on the vehicle chassis. A lifting shaft is slidably installed at the bottom end of the hydraulic cylinder, and a driven rack is fixedly installed at the bottom end of the lifting shaft. The outer ring of the hydraulic cylinder is fixedly mounted with a bracket, and the bottom end of the bracket is rotatably mounted with a gear that meshes and drives with the driven rack. The driving rack is mounted on the upper end of the axle and meshes and drives with the gear. The hydraulic cylinder has a first hydraulic chamber, the adapter ring has a second hydraulic chamber, the hydraulic disc has a third hydraulic chamber, and the hydraulic shaft has a fourth hydraulic chamber. The first, second, third, and fourth hydraulic chambers are connected in sequence. A piston is slidably installed in the first hydraulic chamber, and the piston is elastically connected to the top of the lifting shaft by a damping spring.

2. The power steering system according to claim 1, characterized in that: The steering assembly includes a steering wheel and a hydraulic steering gear. The hydraulic steering gear is mounted on the axle, and a rotating shaft is driven to the input end of the hydraulic steering gear. The bottom end of the steering wheel is movably connected to the rotating shaft. The output end of the hydraulic steering gear is equipped with a tie rod, and the end of the tie rod is rotatably connected to the wheel hub via a steering knuckle arm.

3. A power steering system according to claim 2, characterized in that: The hydraulic power steering assembly also includes an oil tank. Both the hydraulic pump and the oil tank are fixedly installed on the top of the vehicle chassis. The hydraulic pump, the oil tank, and the hydraulic steering gear are connected in sequence through hydraulic pipes to form a circulating oil circuit.

4. A power steering system according to claim 1, characterized in that: The top of the first hydraulic chamber is connected to the second hydraulic chamber, the second hydraulic chamber is connected to the third hydraulic chamber through a guide groove, and the end of the third hydraulic chamber is connected to the fourth hydraulic chamber.

5. A power steering system according to claim 1, characterized in that: An adjustment mechanism is also installed on the axle. The adjustment mechanism includes a support shaft, which is fixedly installed on the upper end of the axle. A lifting slider is slidably inserted into the top end of the support shaft, and the top end of the lifting slider is fixedly connected to the bottom end of the active rack. The bottom end of the lifting slider is threaded with a lead screw, and the bottom end of the lead screw is fixedly mounted with a driven bevel gear. An adjusting shaft is rotatably mounted on one side of the bottom end of the support shaft. One end of the adjusting shaft is fixedly mounted with a driving bevel gear that is connected to the driven bevel gear, and the other end of the adjusting shaft is fixedly mounted with an adjusting handwheel.

6. A steering assist method for a steering assist system according to any one of claims 1-5, characterized in that, Includes the following steps: S1: When the vehicle is in motion, the engine drives the hydraulic power assist component through the transmission components and transmission wheel set. S2: When the steering assembly drives the wheel hub to turn, the hydraulic power steering assembly provides steering assistance to the steering assembly; S3: When the vehicle load increases, the vehicle chassis is pressed down and drives the hydraulic power steering component to move down synchronously. At this time, the telescopic adjustment component is squeezed and contracted, and during the contraction process, the transmission radius of the drive wheel set is reduced, thereby increasing the transmission ratio between the transmission component and the drive wheel set, and thus increasing the hydraulic pressure of the hydraulic power steering component to improve the steering assistance provided by the hydraulic power steering component to the steering component.

7. The application of a power steering system according to any one of claims 1-5 in a hydraulic pallet truck.

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