Mechanical electric power-assisted recirculating ball steering gear

Abstract

The utility model discloses a mechanical electric power-assisted recirculating ball steering gear, and belongs to the technical field of steering gears. Two ends of the steering gear shell are respectively provided with four threaded holes, two ends of the steering gear shell are provided with a first side baffle and a second side baffle, the first side baffle and the second side baffle are provided with fixing bolts, the fixing bolts are fixedly connected with the threaded holes, the middle of the first side baffle is provided with a hole, and a steering bearing is arranged around the hole. A steering bearing is arranged at the same axis of the second side baffle and the first side baffle, a steering screw is arranged in the steering bearing and comprises a second lead screw, first mounting shafts connected with the steering bearing are arranged at the two ends of the second lead screw, a rod is arranged at one end, close to one side of the first side baffle, of the first mounting shaft, the first lead screw is arranged in the middle of the rod, and a power-assisted threaded sleeve is arranged on the first lead screw. The fixing frame is provided with a steering bearing at the axis of the steering screw, and the steering bearing at the position of the fixing frame is fixedly connected with the rod. According to the utility model, power-assisted steering is provided for the steering screw through the power-assisted motor, so that the operation of a user is more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of steering gear technology, and more specifically, it relates to a mechanical electric power-assisted recirculating ball steering gear. Background Technology

[0002] A hydraulic recirculating ball steering system uses fluid pressure to assist the steering gear internally, so that the steering wheel requires appropriate force when turned by the driver. In this process, a hydraulic pump is needed to supply pressurized fluid. In addition, the vehicle speed and steering angle signals are detected at the same time to control the amount of oil delivered by the hydraulic pump to meet the design steering feel.

[0003] In existing technologies, the hydraulic pressure build-up response time is relatively long, and the braking noise is loud. Moreover, with intelligent development becoming the mainstream, hydraulic recirculating ball steering cannot provide active steering operation when it is not under human control, thus failing to achieve functions such as lane keeping, automatic parking, and autonomous driving. Hydraulic power steering requires timely replenishment of steering fluid, and oil pollution can easily occur if the pipeline system leaks.

[0004] To address the aforementioned technical problems, this application proposes a solution. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a mechanical electric power-assisted recirculating ball steering gear, which provides steering assistance to the steering screw through a power-assisted motor, making it more convenient for users to operate.

[0006] A mechanical electric power steering system includes a steering gear housing. Four threaded holes are fixedly connected to the outer sides of both ends of the steering gear housing. A first side plate and a second side plate are fixedly connected to both ends of the steering gear housing. Fixing bolts are fixedly connected to the first and second side plates, and the fixing bolts are fixedly connected to the threaded holes. A hole is opened in the middle of the first side plate, and a steering bearing is fixedly connected around the hole. A steering bearing is fixedly connected to the second side plate along the same axis as the first side plate. A steering screw is fixedly connected inside the steering bearing. The steering screw includes a lead screw 2. Mounting shafts 1 are fixedly connected to both ends of the lead screw 2 and are fixedly connected to the steering bearings. A rod is fixedly connected to one end of the mounting shaft 1 near the first side plate. The first lead screw 1 is located in the middle of the rod, and a power assist sleeve is meshed and driven onto the lead screw 1. A fixing bracket is fixedly connected to one end of the first side plate. A steering bearing is fixedly connected to the fixing bracket at the axis of the steering screw, and the steering bearing at the fixing bracket position is fixedly connected to the rod.

[0007] Preferably, the fixed frame is provided with a power screw on one side of the steering screw, the power screw is in meshing transmission connection with the power screw sleeve, the power screw is fixedly connected with power bearings at both ends, the two power bearings are fixedly connected with the fixed frame, the power screw is parallel to the steering screw, and the fixed frame is fixedly connected with a power motor at an end away from the steering gear housing.

[0008] Preferably, the screw rod is rotatably connected with a steering nut, a steering output shaft is arranged in the steering gear housing on one side of the steering nut, and the steering output shaft is perpendicular to the steering screw.

[0009] Preferably, the steering output shaft comprises half teeth in meshing transmission connection with the steering nut, mounting shafts two are arranged at both ends of the half teeth, output bearings are fixedly connected to the mounting shafts two, side end covers one and two are fixedly connected to the steering gear housing at both ends of the steering output shaft, fixed bolts are fixedly connected to the side end covers one and two, respectively, one of the output bearings is fixedly connected to the side end cover one and the side end cover two, respectively, and one end of one of the mounting shafts two penetrates the side end cover one and is provided with a toothed column outside.

[0010] Preferably, a plurality of threaded fixing holes for fixing the steering gear housing to the frame are arranged at one end outside the steering gear housing.

[0011] Preferably, the output bearings, the steering bearings and the power bearings are sealed bearings.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The utility model mainly solves the transmission hydraulic circulating ball steering gear steering system by using a power motor, the system response time is greatly shortened relative to the liquid pressure response time, the hard off-road frame structure advantages are met, the active steering function is realized, the lane keeping, automatic parking and automatic driving and other function development hardware supports are realized, the power pump and the pipeline system are omitted, the steering system parts are simplified, the control is more efficient, the cost is saved, and more effective space is contributed to the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is an external structure schematic view of the utility model;

[0015] Figure 2 It is an internal structure section view of the utility model;

[0016] Figure 3 It is another view of the external structure schematic view of the utility model;

[0017] Figure 4 It is a structure schematic view of the steering screw;

[0018] Figure 5 Structure diagram of the steering output shaft matched with the steering nut.

[0019] In the figure, 1, the power-assisted motor; 2, the steering screw rod; 201, the rod; 202, the screw rod one; 203, the mounting shaft one; 204, the screw rod two; 3, the fixed frame; 4, the power-assisted bearing; 5, the power-assisted screw rod; 6, the power-assisted screw sleeve; 7, the steering bearing; 8, the fixed bolt; 9, the side baffle one; 10, the steering nut; 11, the steering gear housing; 12, the steering output shaft; 1201, the half tooth; 1202, the mounting shaft two; 1203, the tooth column; 13, the threaded fixing hole; 14, the side baffle two; 15, the side end cover one; 16, the output bearing; 17, the threaded hole; 18, the side end cover two. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with the drawings:

[0021] The orientation terms involved in the paragraphs of detailed description are only for the convenience of the person skilled in the art to understand the technical solutions recorded in the application according to the visual orientation shown in the drawings. Except for explicit provisions and limitations, the terms such as "arrangement", "installation", "connection" should be understood broadly, and for the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] As Figures 1 to 5 shown, a mechanical electric power-assisted recirculating ball steering gear, through the action of the power-assisted motor, facilitates the driver to drive, including the steering gear housing 11, the steering gear housing 11 both ends outside are fixedly connected with four threaded holes 17, the steering gear housing 11 both ends are fixedly connected with the side baffle one 9 and the side baffle two 14, the side baffle one 9 and the side baffle two 14 are fixedly connected with the fixed bolt 8, the fixed bolt 8 is fixedly connected with the threaded hole 17, the side baffle one 9 middle part is provided with a hole, and the steering bearing 7 is fixedly connected around the hole, the side baffle two 14 is fixedly connected with the steering bearing 7 at the same axis line of the side baffle one 9, the steering bearing 7 is fixedly connected with the steering screw rod 2 in, the steering screw rod 2 includes the screw rod two 204, the screw rod two 204 both ends are provided with the mounting shaft one 203 fixedly connected with the steering bearing 7, the mounting shaft one 203 one end is fixedly connected with the rod 201 close to the side baffle one 9 side, the rod 201 is provided with the screw rod one 202 in the middle, the screw rod one 202 is engaged with the power-assisted screw sleeve 6 and is connected, the side baffle one 9 one end is fixedly connected with the fixed frame 3, the fixed frame 3 is fixedly connected with the steering bearing 7 at the steering screw rod 2 axis line, and the steering bearing 7 at the fixed frame 3 position is fixedly connected with the rod 201.The steering screw rod 2 is fixedly connected with three steering bearings 7, on the one hand, the steering screw rod 2 is facilitated to rotate, and on the other hand, the steering screw rod 2 is fixed, to prevent the steering screw rod 2 from displacement.

[0023] The fixed frame 3 is provided with a power screw 5 on one side of the steering screw 2, the power screw 5 is in meshing transmission connection with a power screw sleeve 6, the power screw 5 is fixedly connected with power bearings 4 at two ends, and the power screw 5 is convenient for rotating. The two power bearings 4 are fixedly connected with the fixed frame 3, the power screw 5 is parallel with the steering screw 2, a power motor 1 is fixedly connected with the fixed frame 3 away from the steering gear housing 11, and the power motor 1 rotates to drive the steering screw 2 to rotate. The power motor 1 is fixedly connected with the power screw 5 at an extending end. The screw rod two 204 is rotatably connected with a steering nut 10, in the utility model, the steering nut 10 is prior art, and simply, the steering nut 10 has a plurality of steel balls in contact with the screw rod two 204, when the steering nut 10 moves, the steel balls in the interior circulate and flow through the pipeline at the bottom of the steering nut 10, the steel balls are prevented from running to one side to facilitate the movement of the steering nut 10, and specific details are not described in detail. The steering gear housing 11 is provided with a steering output shaft 12 on one side of the steering nut 10, and the steering output shaft 12 is perpendicular to the steering screw 2.

[0024] The steering output shaft 12 comprises half teeth 1201 in meshing transmission connection with the steering nut 10, mounting shafts two 1202 are arranged at two ends of the half teeth 1201, output bearings 16 are fixedly connected with the mounting shafts two 1202, and the steering output shaft 12 is convenient for rotating. The steering gear housing 11 is fixedly connected with side end covers one 15 and two 18 at two ends of the steering output shaft 12, the side end covers one 15 and two 18 are fixedly connected with fixed bolts 8, the two output bearings are fixedly connected with the side end covers one 15 and two 18, one end of one of the mounting shafts two 1202 penetrates through the side end cover one 15, and a tooth column 1203 is arranged outside the side end cover one 15. The steering gear housing 11 is provided with a plurality of threaded fixing holes 13 fixed with a vehicle frame at one end, and the plurality of threaded fixing holes 13 can firmly fix the device with the vehicle frame.

[0025] The output bearings 16, the steering bearings 7 and the power bearings 4 used in the utility model are sealed bearings, and the sealed bearings have the advantage that the leakage of lubricating oil in the device is prevented.

[0026] The skilled person in the art can limit the specified positions of the execution components in the following movement processes by the prior art mastered by the skilled person, such as installing corresponding mechanical limit switches or photoelectric sensors; in order to realize automatic operation, the utility model can adopt numerical control technology or PLC to control the movement of the execution components.

[0027] Working principle: when the steering wheel rotates, the steering shaft drives the steering screw to rotate, the force is transmitted to the steering nut through the steel balls in the steering nut, the steering nut moves along the axial direction, the steel balls circulate and roll in the steel ball guide pipe and the rolling channel, the rack on the nut drives the tooth fan and the shaft (the steering output shaft) to rotate, and then drives the steering rocker arm to swing, and the deflection of the vehicle wheel is realized through the steering pull rod.

[0028] The power assistance principle: when the steering wheel rotates, the corner sensor on the steering wheel and the left and right front wheel speed signals are processed by the controller to obtain the power assistance electric signal, and the left and right steering power is realized by controlling the positive and negative rotation of the power assistance motor, and the power assistance size and change are realized by controlling the torque size and change of the motor per unit time; the force of the power assistance motor is rotated by the power assistance screw rod 5 to drive the power assistance screw sleeve 6 to slide along the steering screw rod in the axial direction, and the power assistance screw sleeve 6 changes the axial sliding force along the steering screw rod 2 into the rotary power of the steering screw rod, and increases the power along the steering direction to realize the electric mechanical power assistance of the steering wheel.

[0029] Electric control active steering: this scheme can realize that when the steering wheel has no steering signal, the vehicle enters the auxiliary driving, and the steering controller actively controls the positive and negative rotation of the power assistance motor and the amount of positive and negative rotation according to the auxiliary driving signal, so as to realize the active steering of the vehicle and realize the auxiliary driving function of the vehicle.

[0030] Finally, although the present specification is described according to the embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and the skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments which can be understood by the skilled in the art.

Claims

1. A mechanically electrically assisted recirculating ball steering gear comprising a steering gear housing (11), characterized in that: The outer side of both ends of the steering gear housing (11) is fixedly connected with four threaded holes (17), the both ends of the steering gear housing (11) are fixedly connected with side baffle one (9) and side baffle two (14), the side baffle one (9) and the side baffle two (14) are fixedly connected with fixed bolts (8), the fixed bolts (8) are fixedly connected with the threaded holes (17), the middle part of the side baffle one (9) is provided with a hole, and the hole is fixedly connected with a steering bearing (7), the side baffle two (14) is fixedly connected with the steering bearing (7) at the same axis line of the side baffle one (9), the steering bearing (7) is fixedly connected with a steering screw rod (2) in the inside, the steering screw rod (2) comprises a lead screw two (204), both ends of the lead screw two (204) are provided with mounting shaft one (203) fixedly connected with the steering bearing (7), one end of the mounting shaft one (203) close to the side baffle one (9) is fixedly connected with a rod (201), the middle part of the rod (201) is provided with a lead screw one (202), the lead screw one (202) is meshingly and drivingly connected with a power screw sleeve (6), one end of the side baffle one (9) is fixedly connected with a fixed frame (3), the fixed frame (3) is fixedly connected with the steering bearing (7) at the axis line of the steering screw rod (2), and the steering bearing (7) at the position of the fixed frame (3) is fixedly connected with the rod (201).

2. A mechanical electric power assisted recirculating ball steering gear according to claim 1, characterised in that: The fixed frame (3) is provided with a power screw rod (5) at one side of the steering screw rod (2), the power screw rod (5) is meshingly and drivingly connected with the power screw sleeve (6), both ends of the power screw rod (5) are fixedly connected with power bearings (4), the two power bearings (4) are fixedly connected with the fixed frame (3), the power screw rod (5) is parallel to the steering screw rod (2), one end of the fixed frame (3) away from the steering gear housing (11) is fixedly connected with a power motor (1), and the extending end of the power motor (1) is fixedly connected with the power screw rod (5).

3. A mechanical electric power assisted recirculating ball steering gear according to claim 1, characterised in that: The lead screw two (204) is rotatably connected with a steering nut (10), one side of the steering nut (10) is provided with a steering output shaft (12) in the steering gear housing (11), and the steering output shaft (12) is perpendicular to the steering screw rod (2).

4. A mechanical electric power assisted recirculating ball steering gear according to claim 3, characterised in that: The steering output shaft (12) comprises half teeth (1201) meshingly and drivingly connected with the steering nut (10), both ends of the half teeth (1201) are provided with mounting shaft two (1202), the mounting shaft two (1202) is fixedly connected with output bearings (16), both ends of the steering output shaft (12) are fixedly connected with side end cover one (15) and side end cover two (18) on the steering gear housing (11), the side end cover one (15) and the side end cover two (18) are fixedly connected with fixed bolts (8), respectively, two output bearings are fixedly connected with the side end cover one (15) and the side end cover two (18), respectively, and one end of one mounting shaft two (1202) penetrates the outside of the side end cover one (15) and is provided with a tooth column (1203).

5. A mechanical electric power assisted recirculating ball steering gear according to claim 1, characterised in that: One end of the steering gear housing (11) is provided with a plurality of threaded fixing holes (13) fixed with a vehicle frame.

6. A mechanical electric power assisted recirculating ball steering gear according to claim 4, characterised in that: The output bearing (16), the steering bearing (7) and the power assistance bearing (4) are sealed bearings. The output bearing (16), the steering bearing (7) and the power assistance bearing (4) are sealed bearings.

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