A dual front axle vehicle steering system

Abstract

The application discloses a double-front-axle automobile steering system, which comprises a reverser, the reverser is connected with a front transmission shaft, the front transmission shaft is connected with a through-type front steering reverser, and the front steering vertical arm of the through-type front steering reverser is connected with a front steering device; the front steering shaft of the through-type front steering reverser penetrates through the reverser body, one end of the front steering shaft is hinged to the front transmission shaft, the other end of the front steering shaft is hinged to a rear transmission shaft, the other end of the rear transmission shaft is hinged to a rear steering reverser, and the rear steering vertical arm of the rear steering reverser is connected with a rear steering device; through use of the through-type front steering reverser, double-hydraulic-reverser assistance can be used, and the bearing capacity is stronger; the reverser is arranged transversely, the arrangement is simple, smaller steering torque fluctuation design can be realized, and steering comfort is improved; the front and rear transmission shafts do not participate in the transmission of steering assistance, only bear smaller steering hand force from the steering wheel, smaller diameter design can be realized, the front axle wheel steering angle can be increased, and the turning ability of the whole vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile steering technology, and particularly relates to a double-front-axle automobile steering system. BACKGROUND

[0002] With the development of the transportation and logistics industry, the state has higher requirements for the carrying capacity of automobiles in terms of road rights, emissions, fuel consumption, emergency steering and the management of large-tonnage small-mark products. Long-distance heavy trucks are widely favored, and most of the current automobiles of this type use double-front-axle mechanisms. Such mechanisms have higher carrying capacity than single-front-axle mechanisms, and the requirement for steering assistance is also greatly improved.

[0003] The traditional double-front-axle steering mechanism adds a power-assisted cylinder, a transition arm and a power-assisted pull rod on the basis of a single-front-axle steering mechanism. In order to meet the carrying requirement, a large-diameter steering gear needs to be matched, the power assistance is limited, and the emergency steering force does not meet the requirement after the power-assisted system fails. The structure needs to be matched with a transition arm and a power-assisted pull rod, and the structure is complex. The power-assisted pull rod bears a large force, the rod diameter is large, and the space arrangement of the whole vehicle is limited. In order to avoid the interference between the power-assisted pull rod and the tires, suspensions and other components, the turning angle of the wheels is small, which affects the turning ability of the whole vehicle. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a double-front-axle automobile steering system with increased carrying capacity, simple overall structure and improved turning ability.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows: a double-front-axle automobile steering system, comprising a reversing gear, an output shaft of the reversing gear being connected with a front transmission shaft, the front transmission shaft being connected with a through-type front steering gear, the through-type front steering gear comprising a steering gear body and a front steering shaft, a front steering vertical arm being installed on the steering gear body, and a front steering device being connected with a free end of the front steering vertical arm; the front steering shaft penetrating through the steering gear body, one end of the front steering shaft being hinged with the front transmission shaft, the other end of the front steering shaft being hinged with a rear transmission shaft, the other end of the rear transmission shaft being hinged with a rear steering gear, and a rear steering vertical arm of the rear steering gear being connected with a rear steering device.

[0006] As a preferred technical scheme, the front steering device comprises a front steering pull rod hinged with the front steering vertical arm, and the other end of the front steering pull rod being hinged with a front steering knuckle arm of a front steering axle.

[0007] As a preferred technical scheme, the rear steering device comprises a rear steering pull rod hinged with the rear steering vertical arm, and the other end of the rear steering pull rod being hinged with a rear steering knuckle arm of a rear steering axle.

[0008] As a preferred technical scheme, the output shaft of the reversing gear is hinged to the front transmission shaft through a universal joint.

[0009] As a preferred technical scheme, one end of the front steering shaft is hinged to the front transmission shaft through a universal joint, and the other end of the front steering shaft is hinged to the rear transmission shaft through a universal joint.

[0010] As a preferred technical scheme, the rear transmission shaft is hinged to the input shaft of the rear steering gear through a universal joint.

[0011] With the above technical scheme, the double-front-axle automobile steering system comprises a reversing gear, an output shaft of the reversing gear is connected with a front transmission shaft, the front transmission shaft is connected with a through-type front steering gear, the through-type front steering gear comprises a steering gear body and a front steering shaft, a front steering drop arm is installed on the steering gear body, and a front steering device is connected to a free end of the front steering drop arm; the front steering shaft penetrates through the steering gear body, one end of the front steering shaft is hinged to the front transmission shaft, the other end of the front steering shaft is hinged to a rear transmission shaft, the other end of the rear transmission shaft is hinged to a rear steering gear, and a rear steering drop arm of the rear steering gear is connected to a rear steering device; by using the through-type front steering gear, double-hydraulic-steering-gear assistance can be used, and the carrying capacity is stronger; the steering gear is arranged transversely, the reversing gear is connected with the steering column, the arrangement is simple, smaller steering torque fluctuation design can be realized, and steering comfort is improved; the transmission shafts connected between the reversing gear, the through-type front steering gear and the rear steering gear do not participate in the transmission of steering assistance, only bear smaller steering force from the steering wheel, smaller diameter design can be realized, the front-axle wheel steering angle can be increased, and the turning ability of the whole vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] The following drawings are only intended to illustrate and explain the present application, and do not limit the scope of the present application. Among them:

[0013] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0014] In the drawings: 1-reversing gear; 2-front transmission shaft; 31-steering gear body; 32-front steering shaft; 33-front steering drop arm; 4-rear transmission shaft; 51-rear steering gear; 52-rear steering drop arm; 61-front steering pull rod; 62-front steering bridge; 71-rear steering pull rod; 72-rear steering bridge; 8-carriage. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0016] like Figure 1 As shown, a dual-front-axle automotive steering system includes a commutator 1. The output shaft of the commutator 1 is connected to a front drive shaft 2. The front drive shaft 2 is connected to a through-type front steering gear. The through-type front steering gear includes a steering gear body 31 and a front steering shaft 32. A front steering drop arm 33 is mounted on the steering gear body 31. The free end of the front steering drop arm 33 is connected to a front steering device. The front steering shaft 32 passes through the steering gear body 31. One end of the front steering shaft 32 is hinged to the front drive shaft 2, and the other end of the front steering shaft 32 is hinged to a rear drive shaft 4. The other end of the rear drive shaft 4 is hinged to a rear steering gear 51. The rear steering drop arm 52 of the rear steering gear 51 is connected to a rear steering device.

[0017] The front steering device includes a front steering tie rod 61 hinged to the front steering drop arm 33, and the other end of the front steering tie rod 61 is hinged to the front steering knuckle arm of the front steering axle 62. The rear steering device includes a rear steering tie rod 71 hinged to the rear steering drop arm 52, and the other end of the rear steering tie rod 71 is hinged to the rear steering knuckle arm of the rear steering axle 72.

[0018] The commutator 1 is rigidly fixed to the frame 8. The input shaft of the commutator 1 is connected to the steering column through a universal joint, and the output shaft of the commutator 1 is connected to the front drive shaft 2 through a universal joint.

[0019] The through-type front steering gear is rigidly fixed to the frame 8. The front steering shaft 32 of the through-type front steering gear runs through the entire steering gear body 31, with its front end connected to the front drive shaft 2 via a universal joint and its rear end connected to the rear drive shaft 4 via a universal joint. The front steering drop arm 33 of the through-type front steering gear is connected to the front steering tie rod 61 through its lower hinge hole. The front end of the front steering tie rod 61 is connected to the lower hinge hole of the front steering drop arm 33 of the through-type front steering gear, and its rear end is hinged to the steering knuckle arm of the front steering axle 62. The transmission connection between the front steering drop arm 33 and the front steering shaft 32 of the through-type front steering gear is common knowledge in the art and will not be described in detail here.

[0020] The rear steering gear 51 is rigidly fixed to the frame 8. The input shaft of the rear steering gear 51 is connected to the rear drive shaft 4 via a universal joint. The rear steering drop arm 52 is connected to the rear steering tie rod 71 through its lower hinge hole. The front end of the rear steering tie rod 71 is connected to the lower hinge hole of the rear steering drop arm 52 of the rear steering gear 51, and the rear end is hinged to the steering knuckle arm of the rear steering axle 72.

[0021] When the vehicle turns left, the output shaft of the commutator 1 rotates, causing the front drive shaft 2 to rotate. This drives the front steering arm 33 of the through-type front steering gear to pull the front steering tie rod 61 forward. The front steering tie rod 61 then pulls the steering knuckle arm of the front steering axle 62 forward, causing the inner and outer steering wheels of the front steering axle 62 to turn left. The rear end of the steering shaft of the through-type front steering gear drives the rear drive shaft 4 and the rear steering arm 52 of the rear steering gear 51 to pull the rear steering tie rod 71 forward. The rear steering tie rod 71 then pulls the steering knuckle arm of the rear steering axle 72 forward, causing the inner and outer steering wheels of the rear steering axle 72 to turn left. This completes the left turn of the dual front axles.

[0022] When the vehicle turns right, the output shaft of the commutator 1 rotates, causing the front drive shaft 2 to rotate. This drives the front steering arm 33 of the through-type front steering gear to pull the front steering tie rod 61 backward. The front steering tie rod 61 then pulls the steering knuckle arm of the front steering axle 62 backward, driving the inner and outer steering wheels of the front steering axle 62 to turn right. The rear end of the steering shaft of the through-type front steering gear drives the rear drive shaft 4. The rear steering arm 52 of the rear steering gear 51 then pulls the rear steering tie rod 71 backward. The rear steering tie rod 71 then pulls the steering knuckle arm of the rear steering axle 72 backward, driving the inner and outer steering wheels of the rear steering axle 72 to turn right. This completes the right turn of both front axles.

[0023] When turning, high-pressure oil from the power steering pump flows to the through-type front steering gear and rear steering gear 51 to achieve steering assistance.

[0024] Compared with existing technologies, the advantages of this technical solution are:

[0025] 1. By using a through-type front steering gear, dual hydraulic steering assist can be used, resulting in a stronger load-bearing capacity;

[0026] 2. The two steering gears are arranged laterally, eliminating the need for tilting installation. They are connected to the steering column using commutator 1, which simplifies the layout and allows for a smaller steering torque fluctuation design, thus improving steering comfort.

[0027] 3. The drive shaft connecting the commutator 1, the through-type front steering gear, and the rear steering gear 51 does not participate in the force transmission of steering assist. It only bears the small operating force from the steering wheel, which can achieve a smaller diameter design. This can increase the steering angle of the front axle wheels and improve the turning ability of the whole vehicle.

[0028] 4. It can realize dual-circuit hydraulic power steering. When one steering gear fails, power steering can still be achieved through the other steering gear, which meets the national emergency steering requirements.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A dual front axle vehicle steering system, characterized by: The reversing device comprises a reversing device, an output shaft of the reversing device is connected with a front transmission shaft, the front transmission shaft is connected with a through-type front steering device, the through-type front steering device comprises a steering device body and a front steering shaft, a front steering drop arm is installed on the steering device body, and a front steering device is connected with a free end of the front steering drop arm; the front steering shaft penetrates through the steering device body, one end of the front steering shaft is hinged with the front transmission shaft, the other end of the front steering shaft is hinged with a rear transmission shaft, the other end of the rear transmission shaft is hinged with a rear steering device, and a rear steering drop arm of the rear steering device is connected with a rear steering device. The output shaft of the reversing device is hinged with the front transmission shaft through a universal joint; one end of the front steering shaft is hinged with the front transmission shaft through a universal joint, and the other end of the front steering shaft is hinged with the rear transmission shaft through a universal joint.

2. The dual front axle vehicle steering system of claim 1, wherein: The front steering device comprises a front steering drag link hinged with the front steering drop arm, and the other end of the front steering drag link is hinged with a front steering knuckle arm of a front steering bridge.

3. The dual front axle vehicle steering system of claim 1, wherein: The rear steering device comprises a rear steering drag link hinged with the rear steering drop arm, and the other end of the rear steering drag link is hinged with a rear steering knuckle arm of a rear steering bridge.

4. The dual front axle vehicle steering system of any one of claims 1-3, wherein: The rear transmission shaft is hinged with an input shaft of the rear steering device through a universal joint.

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