An electric steering gear

Abstract

An electric steering engine includes a rudder bar, a large gear assembly and multiple drive mechanisms, the multiple drive mechanisms are circumferentially distributed on the outer periphery of the large gear assembly, a through hole is opened at the center of the large gear assembly, the rudder bar is located in the through hole and is coaxially connected to the large gear assembly; the drive mechanism includes a drive assembly, a pinion assembly, a suspension device, and a sliding assembly, the suspension device is located on the outer periphery of the large gear assembly and a support is provided on the lower side, the pinion assembly is located in the suspension device, the drive assembly is located on the upper side of the suspension device and the output end is connected to the upper end of the pinion assembly, the pinion assembly is meshed and connected to the large gear assembly, the pinion assembly is sleeved with two rollers matching the shape of the large gear assembly, the two rollers are respectively located on the upper and lower sides of the large gear assembly, and the sliding assembly is installed in the suspension device. This design can not only prevent jamming, but also has a stable structure and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of steering gears, and in particular to an electric steering gear. Background Art

[0002] During the navigation of the ship, in order to realize the steering of the rudder, a steering gear is arranged above the rudder. As a green, energy-saving, precise and efficient marine steering device, the electric steering gear directly controls the drive motor through the reduction mechanism to adjust the rudder, eliminating the secondary conversion and transmission links of the intermediate hydraulic energy in the traditional steering mechanism, improving the transmission efficiency, and avoiding the risk of leakage of the hydraulic system; and there is no need to keep the equipment running during the steering interval, which greatly reduces the energy consumption of the equipment and the system noise. However, due to the lack of the intermediate hydraulic buffer link, when the rudder stock shakes, it may cause problems such as gear pair disengagement or meshing jamming. At the same time, if the external load is abnormal or exceeds the maximum rudder deviation command range, the steering gear will move at the limit speed and exceed the normal working stroke, causing the cylinder to hit. The impact force generated causes a certain change in the stress state of the internal structure of the electric steering gear, and the dead point of the mechanism movement is prone to occur, causing the steering gear to get stuck and unable to recover by itself, eventually leading to the failure of the steering gear. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects and problems of the steering gear being stuck and the gear pair being disengaged in the prior art, and to provide an electric steering gear which avoids being stuck and has a stable structure.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] An electric steering gear comprises a rudder stock, a large gear assembly and a plurality of drive mechanisms, wherein the plurality of drive mechanisms are circumferentially distributed on the outer periphery of the large gear assembly, a through hole is opened at the center of the large gear assembly, the rudder stock is located in the through hole and is coaxially connected to the large gear assembly;

[0006] The driving mechanism includes a driving assembly, a pinion assembly, a suspension device, and a sliding assembly. The suspension device is located on the periphery of the large gear assembly and is provided with a support on the lower side. The pinion assembly is located in the suspension device. The driving assembly is located on the upper side of the suspension device and the output end is connected to the upper end of the pinion assembly. The pinion assembly is meshed and connected to the large gear assembly. The pinion assembly is provided with two rollers matching the shape of the large gear assembly. The two rollers are respectively located on the upper and lower sides of the large gear assembly. The two rollers are used to limit the large gear assembly in the upper and lower directions. The sliding assembly is installed in the suspension device to drive the pinion assembly to slide in a direction away from the large gear assembly.

[0007] The large gear assembly includes a large gear ring, a wheel hub, and large gear teeth. The large gear ring is coaxially arranged on the outer periphery of the wheel hub, and the large gear ring is connected to the wheel hub through positioning pins and bolts. The large gear teeth are arranged on the outer peripheral surface of the large gear ring. A through hole is opened at the center of the large gear ring, and a clamping sleeve is connected to the inner wall of the through hole. The clamping sleeve is sleeved on the outer peripheral surface of the rudder bar. A locking nut is arranged on the upper end of the rudder bar, and the lower end of the locking nut abuts against the upper end surface of the large gear ring.

[0008] The outer circumferential surfaces of the two rollers are both in contact with the outer circumferential surface of the large gear ring, and a gap is provided between the two rollers and the large gear teeth.

[0009] The pinion gear assembly includes a pinion gear shaft, an upper bearing, a lower bearing, and pinion gears. The upper bearing, a roller, pinion gears, another roller, and the lower bearing are sequentially sleeved on the outer circumferential surface of the pinion gear shaft from top to bottom. The pinion gears are meshed and connected to the large gears. The two rollers are respectively abutted against the upper and lower ends of the pinion gears. The upper bearing abuts against the upper end surface of the roller located above, and the lower bearing abuts against the lower end surface of the roller located below. The upper bearing and the lower bearing are both fixedly connected to the pinion gear shaft by mounting nuts, and gaskets are provided between the mounting nuts and the upper and lower bearings.

[0010] The suspension device includes an inner shell, an outer shell, an upper pressure cover, and a lower pressure cover. The upper pressure cover and the lower pressure cover are respectively buckled on the upper and lower end surfaces of the inner shell. The inner side wall of the outer shell is provided with a first slide groove in the horizontal direction. The pinion gear assembly is installed in the inner shell. The inner shell is located in the outer shell and is slidably connected to the outer shell through the first slide groove. The side wall of the first slide groove away from the rudder bar is provided with a second slide groove. The sliding assembly is connected to one side of the inner shell and is slidably connected to the second slide groove.

[0011] The sliding assembly includes a support head, a screw, a safety slider, a pre-tightening nut, and multiple safety springs, the support head abuts against one side of the inner shell body, one end of the screw is located in the support head, and the other end passes through the side wall of the outer shell body and is located outside the outer shell body, the other end of the screw is provided with an external thread, the pre-tightening nut is threadedly connected to the other end of the screw, the safety slider is sleeved on the outer circumferential surface of the screw and is slidably connected to the second slide groove, multiple safety springs are all located in the safety slider, and multiple safety springs are circumferentially distributed on the outer circumferential surface of the screw, one end of the safety spring is connected to the outer circumferential surface of the screw, and the other end passes through the safety slider and is connected to a safety steel ball, and the safety steel ball abuts against the side wall of the first slide groove.

[0012] A cavity is provided in the support head, one end of the screw is located in the cavity and is clamped to the support head, the support head is slidably connected to the outer peripheral surface of the screw, and a disc spring is provided between the support head and the safety slider.

[0013] An arc groove is provided at the junction of the first slide groove and the second slide groove, and the arc groove matches the shape of the safety steel ball.

[0014] The cross section of the inner shell is in an I-shape, and four first sliding grooves are provided, and the four first sliding grooves are arranged in sequence at four vertices of the inner shell.

[0015] The driving assembly includes a variable frequency motor, an electromagnetic brake, and a planetary reducer. The planetary reducer is installed on the upper side of the suspension device, the output end of the planetary reducer is connected to the upper end of the pinion assembly, the input end of the planetary reducer is connected to the output end of the variable frequency motor, and the electromagnetic brake is installed at the tail of the variable frequency motor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In an electric steering gear of the present invention, after the large gear assembly is meshed with the small gear assembly, the driving assembly controls the small gear assembly to rotate, thereby driving the large gear assembly to rotate, and the rotation of the large gear assembly drives the rudder stock to rotate. By setting rollers on the upper and lower sides of the large gear assembly to limit the position in the upper and lower directions, the gear pair is prevented from disengaging due to the shaking of the rudder stock, and the reliability of the meshing of the gear pair under alternating loads is improved; by setting multiple sets of driving mechanisms, when the external load is abnormal or a certain driving mechanism is locked due to a fault, the large gear assembly is still rotating under the action of other driving mechanisms, and the driving mechanism slides in the direction away from the large gear assembly through the sliding assembly under the action of the large gear assembly, so that the large gear assembly is disengaged from the faulty small gear assembly, and the faulty unit is quickly isolated. Therefore, the present invention can prevent jamming and has a stable structure.

[0018] 2. In an electric steering gear of the present invention, the large gear ring and the wheel hub adopt a detachable connection mode, which is convenient for adjusting the types of the large gear ring and the wheel hub to adapt to different pinion shafts. The outer cylindrical surface of the roller is closely fitted with the outer track surface of the large gear ring, and the large gear ring is limited in the up and down directions. The roller and the pinion shaft are fixed by setting bearings, gaskets, and nuts, so that the meshing process of the small gear teeth and the large gear teeth is more stable, and at the same time, the center distance of the gear pair can be guaranteed to remain unchanged, avoiding the problems of the gear pair disengagement or meshing and biting, and the meshing accuracy and reliability are high. Therefore, the present invention has wide applicability, high reliability, and high precision.

[0019] 3. In an electric servo of the present invention, the inner housing can slide inside the outer housing through the combination of the outer housing and the inner housing. The screw pre-deforms the disc spring through the pre-tightening nut, so that the support head abuts against the outer housing. The small gear shaft located in the outer housing is acted upon by the disc spring, so that the roller fits tightly with the large gear teeth. When a fault occurs, the inner housing tends to slide outward, and the safety steel ball in the safety slider overcomes the pre-tightening force of the safety spring and compresses inward, so that the safety slider can completely slide into the second slide groove along the axial direction, so that the large and small gears move away from each other until they are out of mesh, so that the faulty unit can be quickly isolated. The screw is acted upon by the inner housing to extend a portion outside the outer housing. By observing the extended length of the screw, the location of the faulty unit can be quickly confirmed, which is convenient for maintenance and replacement. Therefore, the present invention has high reliability, stable structure, and convenient maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view schematic diagram of the present invention.

[0021] Figure 2 yes Figure 1 Schematic cross-sectional view of the large gear assembly at AA.

[0022] Figure 3 yes Figure 1 Partial cross-sectional schematic diagram of the drive assembly, suspension device, and pinion assembly at AA in the middle.

[0023] Figure 4 yes Figure 3 A magnified schematic diagram of point B in the middle.

[0024] Figure 5 It is a cross-sectional schematic diagram of the suspension device in the present invention.

[0025] Figure 6 yes Figure 5 Enlarged schematic diagram of point C in the middle.

[0026] Figure 7 yes Figure 5 Schematic cross-sectional view at DD in the middle.

[0027] Figure 8 yes Figure 7 Enlarged schematic diagram of point E in the middle.

[0028] In the figure: drive mechanism 1, drive assembly 11, planetary reducer 111, frequency conversion motor 112, electromagnetic brake 113, pinion assembly 12, pinion shaft 121, mounting nut 122, gasket 123, upper bearing 124, pinion gear 125, lower bearing 126, roller 127, suspension device 13, outer shell 131, inner shell 132, upper pressure cover 133, lower pressure cover 134, first slide groove 135, second slide groove 136, sliding assembly 14, support head 141, screw 142, pre-tightening nut 143, safety slider 144, safety spring 145, safety steel ball 146, cavity 147, disc spring 148, arc groove 149, large gear assembly 2, large gear ring 21, wheel hub 22, large gear teeth 23, through hole 24, positioning pin 25, bolt 26, rudder stock 3, support 4, expansion sleeve 5, locking nut 6. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] See also Figures 1 to 8 An electric steering gear comprises a rudder bar 3, a large gear assembly 2 and a plurality of drive mechanisms 1, wherein the plurality of drive mechanisms 1 are circumferentially distributed on the outer periphery of the large gear assembly 2, a through hole 24 is provided at the center of the large gear assembly 2, the rudder bar 3 is located in the through hole 24 and is coaxially connected to the large gear assembly 2;

[0031] The driving mechanism 1 includes a driving component 11, a pinion gear component 12, a suspension device 13, and a sliding component 14. The suspension device 13 is located on the periphery of the large gear component 2 and is provided with a support 4 on the lower side. The pinion gear component 12 is located in the suspension device 13. The driving component 11 is located on the upper side of the suspension device 13 and the output end is connected to the upper end of the pinion gear component 12. The pinion gear component 12 is meshed and connected to the large gear component 2. The pinion gear component 12 is provided with two rollers 127 matching the shape of the large gear component 2. The two rollers 127 are respectively located on the upper and lower sides of the large gear component 2. The two rollers 127 are used to limit the large gear component 2 in the upper and lower directions. The sliding component 14 is installed in the suspension device 13, and is used to drive the pinion gear component 12 to slide in the direction away from the large gear component 2.

[0032] The large gear assembly 2 includes a large ring gear 21, a wheel hub 22, and large gear teeth 23. The large ring gear 21 is coaxially arranged on the outer periphery of the wheel hub 22. The large ring gear 21 is connected to the wheel hub 22 through a positioning pin 25 and a bolt 26. The large gear teeth 23 are arranged on the outer peripheral surface of the large ring gear 21. A through hole 24 is opened at the center of the large ring gear 21. The inner wall of the through hole 24 is connected to a clamping sleeve 5. The clamping sleeve 5 is sleeved on the outer peripheral surface of the rudder bar 3. A locking nut 6 is arranged on the upper end of the rudder bar 3, and the lower end of the locking nut 6 abuts against the upper end surface of the large ring gear 21.

[0033] The outer circumferential surfaces of the two rollers 127 are both in contact with the outer circumferential surface of the large gear ring 21 , and a gap is provided between the two rollers 127 and the large gear teeth 23 .

[0034] The pinion gear assembly 12 includes a pinion gear shaft 121, an upper bearing 124, a lower bearing 126, and a pinion gear 125. The upper bearing 124, a roller 127, the pinion gear 125, another roller 127, and the lower bearing 126 are sequentially sleeved on the outer circumferential surface of the pinion gear shaft 121 from top to bottom. The pinion gear 125 is meshed and connected to the large gear teeth 23. The two rollers 127 are respectively abutted against the upper and lower ends of the pinion gear 125. The upper bearing 124 abuts against the upper end surface of the roller 127 located above, and the lower bearing 126 abuts against the lower end surface of the roller 127 located below. The upper bearing 124 and the lower bearing 126 are both fixedly connected to the pinion gear shaft 121 by mounting nuts 122. Gaskets 123 are provided between the mounting nuts 122 and the upper bearing 124 and the lower bearing 126.

[0035] The suspension device 13 includes an inner shell 132, an outer shell 131, an upper pressure cover 133, and a lower pressure cover 134. The upper pressure cover 133 and the lower pressure cover 134 are respectively buckled on the upper and lower end surfaces of the inner shell 132. The inner side wall of the outer shell 131 is provided with a first slide groove 135 in the horizontal direction. The pinion gear assembly 12 is installed in the inner shell 132. The inner shell 132 is located in the outer shell 131 and is slidably connected to the outer shell 131 through the first slide groove 135. The side wall of the first slide groove 135 away from the rudder bar 3 is provided with a second slide groove 136. The sliding assembly 14 is connected to one side of the inner shell 132 and is slidably connected to the second slide groove 136.

[0036] The sliding assembly 14 includes a support head 141, a screw 142, a safety slider 144, a pre-tightening nut 143, and a plurality of safety springs 145. The support head 141 abuts against one side of the inner shell 132. One end of the screw 142 is located inside the support head 141, and the other end passes through the side wall of the outer shell 131 and is located outside the outer shell 131. The other end of the screw 142 is provided with an external thread, and the pre-tightening nut 143 is threadedly connected to the other end of the screw 142. The safety slider 144 is sleeved on the outer circumferential surface of the screw 142 and is slidably connected to the second slide groove 136. The multiple safety springs 145 are all located in the safety slider 144. The multiple safety springs 145 are circumferentially distributed on the outer circumferential surface of the screw 142. One end of the safety spring 145 is connected to the outer circumferential surface of the screw 142, and the other end passes through the safety slider 144 and is connected to a safety steel ball 146. The safety steel ball 146 abuts against the side wall of the first slide groove 135.

[0037] A cavity 147 is defined in the support head 141 , one end of the screw 142 is located in the cavity 147 and is clamped to the support head 141 , the support head 141 is slidably connected to the outer circumference of the screw 142 , and a disc spring 148 is disposed between the support head 141 and the safety slider 144 .

[0038] An arc groove 149 is provided at the junction of the first slide groove 135 and the second slide groove 136 , and the arc groove 149 matches the shape of the safety steel ball 146 .

[0039] The cross section of the inner shell 132 is in an I-shape, and four first slide grooves 135 are provided. The four first slide grooves 135 are sequentially arranged at four vertices of the inner shell 132 .

[0040] The driving assembly 11 includes a variable frequency motor 112, an electromagnetic brake 113, and a planetary reducer 111. The planetary reducer 111 is installed on the upper side of the suspension device 13, the output end of the planetary reducer 111 is connected to the upper end of the pinion assembly 12, the input end of the planetary reducer 111 is connected to the output end of the variable frequency motor 112, and the electromagnetic brake 113 is installed at the tail of the variable frequency motor 112.

[0041] The principle of the present invention is described as follows:

[0042] First, start the variable frequency motor 112 and the planetary reducer 111. The pinion shaft 121 rotates under the action of the planetary reducer 111 and meshes with the large gear teeth 23. The roller 127 abuts against the outer track surface of the large gear ring 21. When a certain drive mechanism 1 fails and locks, the drive mechanism 1 tends to move outward; the safety steel ball 146 in the safety slider 144 overcomes the preload force of the safety spring 145 and compresses inward, and the safety slider 144 is completely retracted into the second slide groove 136 along the axial direction. At this time, the drive mechanism 1 slides along the first slide groove 135, and the large and small gears move away from each other until they are out of mesh. By observing the length of the screw 142 outside the outer shell 131, it is determined that the drive mechanism 1 has failed, and then the drive mechanism 1 is disassembled for repair and replacement.

[0043] Embodiment 1:

[0044] See also Figures 1 to 8 An electric steering gear comprises a rudder bar 3, a large gear assembly 2 and two sets of driving mechanisms 1, wherein the two sets of driving mechanisms 1 are symmetrically distributed on the outer periphery of the large gear assembly 2, a through hole 24 is opened at the center of the large gear assembly 2, the rudder bar 3 is located in the through hole 24 and is coaxially connected to the large gear assembly 2;

[0045] The driving mechanism 1 includes a driving component 11, a pinion gear component 12, a suspension device 13, and a sliding component 14. The suspension device 13 is located on the periphery of the large gear component 2 and is provided with a support 4 on the lower side. The pinion gear component 12 is located in the suspension device 13. The driving component 11 is located on the upper side of the suspension device 13 and the output end is connected to the upper end of the pinion gear component 12. The pinion gear component 12 is meshed and connected to the large gear component 2. The pinion gear component 12 is provided with two rollers 127 matching the shape of the large gear component 2. The two rollers 127 are respectively located on the upper and lower sides of the large gear component 2. The two rollers 127 are used to limit the large gear component 2 in the upper and lower directions. The sliding component 14 is installed in the suspension device 13, and is used to drive the pinion gear component 12 to slide in the direction away from the large gear component 2.

[0046] The large gear assembly 2 includes a large gear ring 21, a wheel hub 22, and large gear teeth 23. The large gear ring 21 is coaxially arranged on the outer periphery of the wheel hub 22. The large gear ring 21 is connected to the wheel hub 22 through a positioning pin 25 and a bolt 26. The large gear teeth 23 are arranged on the outer peripheral surface of the large gear ring 21. A through hole 24 is opened at the center of the large gear ring 21. The inner wall of the through hole 24 is connected with a clamping sleeve 5. The clamping sleeve 5 is sleeved on the outer peripheral surface of the rudder bar 3. A locking nut 6 is arranged at the upper end of the rudder bar 3. The lower end of the locking nut 6 abuts against the upper end surface of the large gear ring 21. The outer peripheral surfaces of the two rollers 127 are both in contact with the outer peripheral surface of the large gear ring 21, and a gap is arranged between the two rollers 127 and the large gear teeth 23.

[0047] The pinion gear assembly 12 includes a pinion gear shaft 121, an upper bearing 124, a lower bearing 126, and a pinion gear 125. The upper bearing 124, a roller 127, the pinion gear 125, another roller 127, and the lower bearing 126 are sequentially sleeved on the outer circumferential surface of the pinion gear shaft 121 from top to bottom. The pinion gear 125 is meshed and connected to the large gear teeth 23. The two rollers 127 are respectively abutted against the upper and lower ends of the pinion gear 125. The upper bearing 124 abuts against the upper end surface of the roller 127 located above, and the lower bearing 126 abuts against the lower end surface of the roller 127 located below. The upper bearing 124 and the lower bearing 126 are both fixedly connected to the pinion gear shaft 121 by mounting nuts 122. Gaskets 123 are provided between the mounting nuts 122 and the upper bearing 124 and the lower bearing 126.

[0048] The suspension device 13 includes an inner shell 132, an outer shell 131, an upper pressure cover 133, and a lower pressure cover 134. The upper pressure cover 133 and the lower pressure cover 134 are respectively buckled on the upper and lower end surfaces of the inner shell 132. The inner side wall of the outer shell 131 is provided with a first slide groove 135 in the horizontal direction. The pinion gear assembly 12 is installed in the inner shell 132. The inner shell 132 is located in the outer shell 131 and is slidably connected to the outer shell 131 through the first slide groove 135. The side wall of the first slide groove 135 away from the rudder bar 3 is provided with a second slide groove 136. The sliding assembly 14 is connected to one side of the inner shell 132 and is slidably connected to the second slide groove 136.

[0049] The sliding assembly 14 includes a support head 141, a screw 142, a safety slider 144, a pre-tightening nut 143, and 8 safety springs 145. The support head 141 abuts against one side of the inner shell 132, one end of the screw 142 is located in the support head 141, and the other end passes through the side wall of the outer shell 131 and is located outside the outer shell 131, the other end of the screw 142 is provided with an external thread, the pre-tightening nut 143 is threadedly connected to the other end of the screw 142, the safety slider 144 is sleeved on the outer circumferential surface of the screw 142 and is slidably connected to the second sliding groove 136, the 8 safety springs 145 are all located in the safety slider 144 and circumferentially distributed on the outer circumferential surface of the screw 142, one end of the safety spring 145 is connected to the outer circumferential surface of the screw 142, and the other end passes through the safety slider 144 and is connected to a safety steel ball 146, and the safety steel ball 146 abuts against the side wall of the first sliding groove 135. A cavity 147 is provided in the support head 141, one end of the screw 142 is located in the cavity 147 and is clamped to the support head 141, the support head 141 is slidably connected to the outer peripheral surface of the screw 142, and a disc spring 148 is provided between the support head 141 and the safety slider 144. An arc groove 149 is provided at the intersection of the first slide groove 135 and the second slide groove 136, and the arc groove 149 matches the shape of the safety steel ball 146. The cross section of the inner shell 132 is I-shaped, and four first slide grooves 135 are provided, and the four first slide grooves 135 are arranged in sequence at the four vertices of the inner shell 132.

[0050] The driving assembly 11 includes a variable frequency motor 112, an electromagnetic brake 113, and a planetary reducer 111. The planetary reducer 111 is installed on the upper side of the suspension device 13, the output end of the planetary reducer 111 is connected to the upper end of the pinion assembly 12, the input end of the planetary reducer 111 is connected to the output end of the variable frequency motor 112, and the electromagnetic brake 113 is installed at the tail of the variable frequency motor 112.

Claims

1. An electric steering gear, characterized in that: It comprises a rudder bar (3), a large gear assembly (2) and a plurality of drive mechanisms (1), wherein the plurality of drive mechanisms (1) are circumferentially distributed on the outer circumference of the large gear assembly (2), a through hole (24) is provided at the center of the large gear assembly (2), and the rudder bar (3) is located in the through hole (24) and is coaxially connected to the large gear assembly (2); The driving mechanism (1) comprises a driving assembly (11), a pinion assembly (12), a suspension device (13), and a sliding assembly (14); the suspension device (13) is located on the outer periphery of the large gear assembly (2) and is provided with a support (4) at the lower side; the pinion assembly (12) is located in the suspension device (13); the driving assembly (11) is located on the upper side of the suspension device (13) and the output end is connected to the upper end of the pinion assembly (12); the pinion assembly (12) is meshed with the large gear assembly (2) and the output end is connected to the upper end of the small gear assembly (12). The small gear assembly (12) is connected to the large gear assembly (2), and is sleeved with two rollers (127) matching the shape of the large gear assembly (2). The two rollers (127) are respectively located on the upper and lower sides of the large gear assembly (2). The two rollers (127) are used to limit the large gear assembly (2) in the upper and lower directions. The sliding assembly (14) is installed in the suspension device (13) and is used to drive the small gear assembly (12) to slide in a direction away from the large gear assembly (2). The suspension device (13) comprises an inner shell (132), an outer shell (131), an upper pressure cover (133), and a lower pressure cover (134); the upper pressure cover (133) and the lower pressure cover (134) are respectively buckled on the upper and lower end surfaces of the inner shell (132); the inner side wall of the outer shell (131) is provided with a first slide groove (135) in the horizontal direction; the pinion gear assembly (12) is installed in the inner shell (132); the inner shell (132) is located in the outer shell (131) and is slidably connected to the outer shell (131) through the first slide groove (135); a second slide groove (136) is provided on the side wall of the first slide groove (135) away from the rudder bar (3); the sliding assembly (14) is connected to one side of the inner shell (132) and is slidably connected to the second slide groove (136); The sliding assembly (14) comprises a support head (141), a screw (142), a safety slider (144), a pre-tightening nut (143), and a plurality of safety springs (145); the support head (141) is in contact with one side of the inner shell (132); one end of the screw (142) is located inside the support head (141), and the other end passes through the side wall of the outer shell (131) and is located outside the outer shell (131); the other end of the screw (142) is provided with an external thread; the pre-tightening nut (143) is threadedly connected to the other end of the screw (142). The safety slider (144) is sleeved on the outer circumference of the screw (142) and is slidably connected to the second slide groove (136). The plurality of safety springs (145) are all located in the safety slider (144). The plurality of safety springs (145) are circumferentially distributed on the outer circumference of the screw (142). One end of the safety spring (145) is connected to the outer circumference of the screw (142), and the other end passes through the safety slider (144) and is connected to a safety steel ball (146). The safety steel ball (146) abuts against the side wall of the first slide groove (135); A cavity (147) is provided in the support head (141), one end of the screw (142) is located in the cavity (147) and is clamped to the support head (141), the support head (141) is slidably connected to the outer peripheral surface of the screw (142), a disc spring (148) is provided between the support head (141) and the safety slider (144), an arc groove (149) is provided at the intersection of the first slide groove (135) and the second slide groove (136), the arc groove (149) matches the shape of the safety steel ball (146), the cross-section of the inner shell (132) is I-shaped, four first slide grooves (135) are provided, and the four first slide grooves (135) are arranged in sequence at the four vertices of the inner shell (132).

2. An electric steering gear according to claim 1, characterized in that: The large gear assembly (2) comprises a large gear ring (21), a wheel hub (22), and large gear teeth (23). The large gear ring (21) is coaxially arranged on the outer periphery of the wheel hub (22). The large gear ring (21) is connected to the wheel hub (22) via a positioning pin (25) and a bolt (26). The large gear teeth (23) are arranged on the outer peripheral surface of the large gear ring (21). A through hole (24) is opened at the center of the large gear ring (21). The inner wall of the through hole (24) is connected to a clamping sleeve (5). The clamping sleeve (5) is sleeved on the outer peripheral surface of the rudder bar (3). A locking nut (6) is arranged at the upper end of the rudder bar (3). The lower end of the locking nut (6) abuts against the upper end surface of the large gear ring (21).

3. An electric steering gear according to claim 2, characterized in that: The outer circumferential surfaces of the two rollers (127) are both in contact with the outer circumferential surface of the large gear ring (21), and a gap is provided between the two rollers (127) and the large gear teeth (23).

4. The electric steering gear according to claim 3, characterized in that: The pinion gear assembly (12) comprises a pinion gear shaft (121), an upper bearing (124), a lower bearing (126), and a pinion gear (125); the upper bearing (124), a roller (127), the pinion gear (125), another roller (127), and the lower bearing (126) are sequentially sleeved on the outer circumferential surface of the pinion gear shaft (121) from top to bottom; the pinion gear (125) is meshedly connected to the large gear gear (23); the two rollers (127) are respectively in contact with the large gear gear (23); At the upper and lower ends of the pinion gear (125), the upper bearing (124) abuts against the upper end surface of the roller (127) located above, and the lower bearing (126) abuts against the lower end surface of the roller (127) located below. The upper bearing (124) and the lower bearing (126) are both fixedly connected to the pinion shaft (121) via a mounting nut (122), and a gasket (123) is provided between the mounting nut (122) and the upper bearing (124) and the lower bearing (126).

5. The electric steering gear according to claim 1, characterized in that: The driving assembly (11) comprises a variable frequency motor (112), an electromagnetic brake (113), and a planetary reducer (111); the planetary reducer (111) is installed on the upper side of the suspension device (13); the output end of the planetary reducer (111) is connected to the upper end of the pinion assembly (12); the input end of the planetary reducer (111) is connected to the output end of the variable frequency motor (112); and the electromagnetic brake (113) is installed at the tail of the variable frequency motor (112).

Images