Electro-hydraulic composite large-angle steering mechanism

Abstract

The invention provides an electro-hydraulic composite large-angle steering mechanism, and relates to the technical field of vehicle chassis, the electro-hydraulic composite large-angle steering mechanism comprises an electric steering gear, two groups of double-wishbone suspensions, a steering knuckle and wheels, the inner sides of the two groups of double-wishbone suspensions are fixed on a vehicle body, the steering knuckle is rotatably arranged on the outer sides of the double-wishbone suspensions, and the wheels are arranged on the steering knuckle. And output ends on two sides of the electric steering gear are respectively hinged with bases of the two groups of expansion pieces, and the output ends of the two groups of expansion pieces are respectively hinged with the two steering cleats. The electric steering gear is used for a wheel Ackerman steering mode, and the double-acting hydraulic cylinder is used for a transverse driving and pivot steering mode; a steering pull rod of a common steering structure is changed into the double-acting hydraulic cylinder, the wheels can rotate by 90 degrees, and therefore the flexibility of a vehicle is improved, and the requirement of the vehicle for the driving space is reduced. The large-angle steering requirement of the vehicle is met, and meanwhile the mechanical coupling advantage of a traditional steering structure is reserved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle chassis, in particular to an electro-hydraulic composite large-angle steering mechanism. Background Art

[0002] At present, the steering by wire chassis mostly uses the central gear rack steering gear or recirculating ball steering gear to drive the steering rod to achieve wheel steering. This method has a mature structure and stable technology. It can work stably even in complex and harsh road conditions for a long time. The pure mechanical steering structure has a clear road feel. The driver can feel the road conditions through the steering wheel, making the driving experience more controllable. The traditional steering mechanism has relatively low manufacturing and maintenance costs.

[0003] Modern urban traffic has many cars, many people, narrow roads, and limited driving space, which puts higher requirements on vehicle performance. If the vehicle can achieve 90-degree steering of all wheels, the turning radius can be greatly reduced, and the vehicle can achieve a variety of complex movement modes such as lateral movement, diagonal driving, steering in a narrow space, and turning on the spot. However, due to the limitation of the structure, the steering angle of traditional suspension is generally between ±40°.

[0004] To this end, various suspension structures that can achieve 90-degree steering of all wheels have been proposed at home and abroad, such as the Protean large-angle steering omnidirectional module, which can achieve 360-degree rotation. The Chinese publication number is: CN 114735077B, which discloses a steering mechanism and steering method with high torque and high steering, and uses an independent electric push rod to achieve large-angle steering of wheels.

[0005] The steering structure provided by the above technical solution has mechanical decoupling of left and right wheel steering, and the steering accuracy depends on the motor controller. This method has higher requirements for motor synchronous steering control; and its technology is relatively complex, involving many components. Once a component fails, it may cause the entire steering system to fail. Since there is no mechanical backup, the handling after the failure is relatively complicated. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides an electro-hydraulic composite large-angle steering mechanism, which solves the problems raised in the above-mentioned background technology.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: an electro-hydraulic composite large-angle steering mechanism, including an electric steering gear, two sets of double-wishbone suspensions, a steering cleat, and wheels. The inner sides of the two sets of double-wishbone suspensions are fixed to the vehicle body, the steering cleat is rotatably set on the outer sides of the double-wishbone suspension, the wheels are set on the steering cleat, and also include two sets of telescopes. The output ends on both sides of the electric steering gear are respectively hinged to the bases of the two sets of telescopes, and the output ends of the two sets of telescopes are respectively hinged to the two steering cleats.

[0010] Preferably, the telescopic device may be a double-acting hydraulic cylinder or an electric push rod.

[0011] Preferably, the electric steering gear includes a housing, a drive motor, a worm wheel, a worm, a rack, and a helical gear rod. The worm wheel and the helical gear rod are coaxially pivoted in the housing. The drive motor is fixed to the housing, and the output end is connected to the worm gear. The worm gear is meshed with the worm wheel. The rack is laterally slidably adapted on the housing and meshed with the helical gear rod. One end of the rack extending out of the housing is hinged to the telescope.

[0012] (III) Beneficial effects

[0013] The present invention provides an electro-hydraulic composite large-angle steering mechanism, which has the following beneficial effects:

[0014] 1. The electro-hydraulic composite large-angle steering mechanism, the electric steering gear is used for the wheel Ackerman steering mode, and the double-acting hydraulic cylinder is used for lateral driving and in-place steering mode; the present invention changes the steering tie rod of the general steering structure to a double-acting hydraulic cylinder, so that the wheel can achieve 90-degree rotation, thereby improving the flexibility of the vehicle and reducing the vehicle's demand for driving space. While meeting the needs of large-angle steering of the vehicle, the present invention retains the advantages of mechanical coupling of the traditional steering structure. This method has little change to the existing chassis structure, low manufacturing cost, and can meet the requirements of existing regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall axonometric diagram of the present invention;

[0016] Figure 2 The anatomical diagram of the electric steering device of the present invention;

[0017] Figure 3 This is a diagram showing the initial state of the wheel of the present invention;

[0018] Figure 4 This is a diagram of the wheel turning 90 degrees in the present invention.

[0019] In the figure: 1 double-acting hydraulic cylinder, 2 electric steering gear, 3 double wishbone suspension, 4 steering horn, 5 wheel, 21 housing, 22 drive motor, 23 worm gear, 24 worm, 25 rack, 26 helical gear. DETAILED DESCRIPTION

[0020] The embodiment of the present invention provides an electro-hydraulic composite large-angle steering mechanism, such as Figure 1-4 As shown, it includes two sets of telescopic devices, an electric steering gear 2, two sets of double wishbone suspensions 3, steering cleats 4, and wheels 5.

[0021] like Figure 2 As shown, the electric steering gear 2 includes a housing 21, a drive motor 22, a worm gear 23, a worm 24, a rack 25, and a helical gear rod 26. The worm gear 23 and the helical gear rod 26 are coaxially pivoted in the housing 21. The drive motor 22 is fixed on the housing 21, and the output end is connected to the worm 24. The worm 24 is meshed with the worm gear 23. The rack 25 is laterally slidably adapted on the housing 21 and meshed with the helical gear rod 26. The rack 25 extends out of the housing 21 at both ends and is respectively hinged to the bases of the two sets of telescopes.

[0022] The inner sides of the two sets of double wishbone suspensions 3 are fixed on the vehicle body, the steering clevis 4 is rotatably arranged on the outer sides of the double wishbone suspensions 3, and the wheels 5 are arranged on the steering clevis 4. By properly adjusting the shape of the clevis and the hinge position of the steering and suspension, the interference between the wheels 5 and the suspension can be avoided when turning at a large angle.

[0023] The telescopic device can be a double-acting hydraulic cylinder 1 or an electric push rod. The output ends of the two sets of telescopic devices are respectively hinged with two steering horns 4.

[0024] The double-acting hydraulic cylinder 1 can be used as a redundant backup for the central electric steering gear 2. When the electric steering gear 2 fails, the control hydraulic cylinder can be used to achieve wheel steering.

[0025] like Figure 3 As shown, when the vehicle is traveling in the Ackerman steering mode, the double-acting hydraulic cylinder 1 keeps its length unchanged under the action of the pressure regulating valve; the electric steering gear 2 drives the rack 25 to move, and the double-acting hydraulic cylinder 1 drives the steering horn 4 to steer the wheel 5.

[0026] like Figure 4 As shown, when the vehicle needs to turn in place or crab-walk 90 degrees, the electric steering gear 2 returns to the zero position; the double-acting hydraulic cylinder 1 extends to a specified length under hydraulic control to achieve a large-angle steering of the wheel 5.

[0027] The present application embodiment: a vehicle, the vehicle is equipped with an electro-hydraulic composite large-angle steering mechanism.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electro-hydraulic composite large-angle steering mechanism, comprising an electric steering gear (2), two sets of double-wishbone suspensions (3), a steering cleat (4), and a wheel (5), wherein the inner sides of the two sets of double-wishbone suspensions (3) are fixed to a vehicle body, the steering cleat (4) is rotatably arranged on the outer sides of the double-wishbone suspensions (3), and the wheel (5) is arranged on the steering cleat (4), characterized in that: It also comprises two groups of telescopic devices, the output ends on both sides of the electric steering gear (2) are respectively hinged to the bases of the two groups of telescopic devices, and the output ends of the two groups of telescopic devices are respectively hinged to the two steering horns (4).

2. The electro-hydraulic large-angle steering mechanism according to claim 1, characterized in that: The telescopic device may be a double-acting hydraulic cylinder (1) or an electric push rod.

3. The electro-hydraulic large-angle steering mechanism according to claim 1, characterized in that: The electric steering gear (2) comprises a housing (21), a driving motor (22), a worm wheel (23), a worm (24), a rack (25), and a helical gear (26); the worm wheel (23) and the helical gear (26) are coaxially pivoted in the housing (21); the driving motor (22) is fixed on the housing (21), and the output end is connected to the worm (24); the worm (24) is meshed with the worm wheel (23); the rack (25) is transversely slidably adapted on the housing (21) and meshed with the helical gear (26); one end of the rack (25) extending out of the housing (21) is hinged to the telescope.

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