An electric power steering system for automobiles

Abstract

This invention relates to the field of automotive steering technology, specifically to an electric power steering system for automobiles. The system includes: a main body comprising a drive rod with a torque sensor fixedly connected to its outer surface; a lubrication mechanism including a power screw movably connected to the inner surface of the steering gear, a connecting rod fixedly connected to the outer surface of the power screw; and a dynamic pressure mechanism, including an oil reservoir, housed inside a lower fixed cover. This invention utilizes a soft, oil-wiping pad fixedly attached to the gear structure. During the steering process, the gears are lubricated by the pad, allowing for frequent, small-volume lubrication of the gears. This passively performs maintenance on the components, increasing the system's durability and reducing the frequency of vehicle maintenance.

Description

Technical Field

[0001] This invention relates to the field of automotive steering technology, specifically to an electric power steering system for automobiles. Background Technology

[0002] Electric power steering (EPS) is a steering system that uses an electric motor or pump to provide power assistance for steering, offering drivers a more relaxed and responsive driving experience and reducing driver fatigue.

[0003] Traditional vehicle steering systems rely on the driver's force to turn the hydraulic or electric pumps in the steering system, while EPS systems apply electric assistance to the steering system. By using one or more motors or electric pumps, the EPS system can automatically sense the vehicle's driving conditions and provide appropriate steering assistance while the driver applies steering wheel force, thus helping the driver to control the vehicle's steering more easily. However, because there are mechanical gear meshing in the power steering unit, and steering generates a large amount of power, the contact friction between the gears is severe. If regular maintenance and lubrication are not performed, it will lead to damage to the components. Traditional maintenance methods are carried out through regular vehicle inspections, which require disassembly of internal components, making maintenance work extremely inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide an electric power steering device for automobiles, in order to solve the problem mentioned in the background art that, due to the mechanical gear meshing between power steering devices and the large power generated during steering, the contact friction between the gears is severe. If regular maintenance and lubrication are not performed, damage to the components will occur. Traditional maintenance methods are carried out through regular vehicle inspections, which require disassembly of internal components, making maintenance work extremely inconvenient.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electric power steering device for automobiles, comprising:

[0006] The main body includes a drive rod, a torque sensor is fixedly connected to the outer surface of the drive rod, a transmission cylinder is provided at the lower end of the drive rod, a wire is fixedly connected to the outer surface of the torque sensor, a controller is fixedly connected to the end of the wire away from the torque sensor, a power shaft is movably connected to the inside of the controller through a motor, a transmission belt is movably connected to the outer surface of the power shaft, and a steering gear is movably connected to the inner surface of the transmission belt.

[0007] The lubrication mechanism includes a power screw movably connected to the inner surface of the steering gear, a connecting rod fixedly connected to the outer surface of the power screw, a transmission gear plate fixedly connected to the end of the connecting rod away from the power screw, a lower fixed cover fixedly connected to the side of the transmission cylinder away from the drive rod, an auxiliary oil tank fixedly connected to the outer surface of the lower fixed cover, a fixed arm fixedly connected to the inner surface of the auxiliary oil tank, an oil collection cylinder fixedly connected to the outer surface of the fixed arm, an oil sucker rod fixedly connected to the inner surface of the fixed arm, and an oil wiping cotton fixedly connected to the inner surface of the oil collection cylinder.

[0008] Preferably, the end of the drive rod near the transmission cylinder is connected to the transmission gear plate inside the transmission cylinder via a gear. A dynamic pressure mechanism is provided inside the lower fixed cover. The dynamic pressure mechanism includes an oil storage tank. An oil inlet is fixedly connected to the outer surface of the lower fixed cover. An oil seal cap is movably connected to the upper surface of the oil inlet. A lower oil pipe is fixedly connected to the lower end of the oil storage tank. A pump oil tank is fixedly connected to the end of the lower oil pipe away from the oil storage tank. A pump oil rod is movably connected to the inner surface of the pump oil tank. A pump oil pipe is fixedly connected to the lower end of the pump oil tank. A check valve tank is provided at the end of the pump oil pipe away from the pump oil tank. A fixing block is provided at the upper end of the check valve tank. An oil delivery pipe is fixedly connected to the inner surface of the fixing block. A linkage arm plate is fixedly connected to the outer surface of the pump oil rod. A connecting plate is fixedly connected to the outer surface of the connecting rod. A push plate is fixedly connected to the end of the connecting plate away from the connecting rod.

[0009] Preferably, the power screw is fixedly connected to the transmission gear plate via a connecting rod, the transmission cylinder is cylindrical in shape, the interior of the transmission cylinder has a hollow structure, the connecting rod is movably connected to the interior of the transmission cylinder, and portions of the power screw and the transmission gear plate are movably connected to the interior of the transmission cylinder.

[0010] Preferably, the lower fixed cover is rectangular in shape, the auxiliary oil tank is in two groups, the two groups of auxiliary oil tanks are located on both sides of the lower fixed cover, the interior of the auxiliary oil tank is hollow, and the auxiliary oil tank is fixedly connected to the oil collection cylinder through a fixed arm.

[0011] Preferably, the oil-absorbing core rod is located inside the auxiliary oil tank, and the oil-absorbing core rod is abutted against the oil-absorbing cotton. The oil-collecting cylinder is cylindrical in shape and has a hollow internal structure. The oil-absorbing core rod is filled with oil-absorbing cotton. The oil-absorbing cotton and the oil-absorbing core rod are located inside the oil-collecting cylinder. The oil-absorbing cotton is in two sets: one set of oil-absorbing cotton is in contact with the helical teeth of the power screw, and the other set of oil-absorbing cotton is in contact with the rack part of the transmission gear plate.

[0012] Preferably, the outer end of the lower fixed cover is provided with a rectangular slot, the upper oil port is located at the outer end of the rectangular slot of the lower fixed cover, the lower end of the oil storage tank is provided with a round hole, the lower oil pipe is fixedly connected to the round hole portion of the oil storage tank, the pump oil tank is cylindrical in shape, the interior of the pump oil tank has a hollow structure, and the oil storage tank is connected to the interior of the pump oil tank through the lower oil pipe.

[0013] Preferably, the pump rod is cylindrical, with a portion of the pump rod located inside the pump oil chamber. The pump rod and the pump oil chamber are slidable relative to each other. A circular hole is provided at the lower end of the pump oil chamber. The pump oil pipe is fixedly connected to the circular hole portion of the pump oil chamber. The pump oil chamber is connected to the interior of the check valve chamber through the pump oil pipe. The check valve chamber is connected to the interior of the auxiliary oil chamber through a fixing block.

[0014] Preferably, a rectangular movable groove is provided on the side of the lower fixed cover away from the upper oil port, the linkage arm plate is connected to the rectangular movable groove of the lower fixed cover, a rectangular movable groove is provided at the upper end of the transmission cylinder, the connecting plate is connected to the rectangular movable groove of the transmission cylinder, the connecting rod is fixedly connected to the push plate through the connecting plate, and the push plate can abut against the linkage arm plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This device is equipped with a soft cotton pad that is fixedly attached to the gear structure. When the device assists in steering the car, the gear part will be lubricated by the soft cotton pad. This allows the device to perform frequent lubrication of the gear in small amounts during operation, thereby passively completing the maintenance work between the components, increasing the durability of the device and reducing the maintenance frequency of the car.

[0017] 2. The device uses a pump rod to slide laterally during vehicle steering, allowing the pump rod to pump oil to the lubrication mechanisms on both sides. This reduces the amount of oil applied, resulting in better oil application. Furthermore, the power of steering is used to pump oil, eliminating the need for a separate power pump and simplifying the structure. Attached Figure Description

[0018] Figure 1 This is a frontal perspective view of the structure of the present invention;

[0019] Figure 2 This is a rear-view perspective view of the structure of the present invention;

[0020] Figure 3 This is a rear view schematic diagram of the structure of the present invention;

[0021] Figure 4 For the present invention Figure 1 A partial three-dimensional schematic diagram of the structure of the central transmission cylinder;

[0022] Figure 5 For the present invention Figure 4 Partial three-dimensional schematic diagram of the middle fixed arm structure;

[0023] Figure 6 For the present invention Figure 1 A three-dimensional schematic diagram of the internal structure of the lower and middle fixed covers;

[0024] Figure 7 For the present invention Figure 6 A three-dimensional cross-sectional view of the internal structure of the lower central cover;

[0025] Figure 8 For the present invention Figure 7 Enlarged 3D schematic diagram of the local structure at point A;

[0026] Figure 9 For the present invention Figure 3 A partial three-dimensional schematic diagram of the structure of the push plate.

[0027] In the diagram: 1. Drive rod; 11. Torque sensor; 12. Transmission cylinder; 13. Wire; 14. Controller; 15. Power shaft; 16. Transmission belt; 17. Steering gear; 2. Power screw; 21. Connecting rod; 22. Transmission gear plate; 23. Lower fixed cover; 24. Auxiliary oil tank; 25. Fixed arm; 26. Oil collection cylinder; 27. Oil sucker rod; 28. Oil wiping cotton; 3. Oil reservoir; 31. Oil inlet; 32. Oil seal cover; 33. Lower oil pipe; 34. Pump oil tank; 35. Pump rod; 36. Pump pipe; 37. Check valve tank; 38. Fixed block; 39. Oil delivery pipe; 310. Linkage arm plate; 311. Connecting plate; 312. Push plate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-9 One embodiment provided by the present invention:

[0030] An electric power steering system for automobiles, comprising:

[0031] The main body includes a drive rod 1, a torque sensor 11 fixedly connected to the outer surface of the drive rod 1, a transmission cylinder 12 provided at the lower end of the drive rod 1, a wire 13 fixedly connected to the outer surface of the torque sensor 11, a controller 14 fixedly connected to the end of the wire 13 away from the torque sensor 11, a power shaft 15 movably connected to the inside of the controller 14 via a motor, a transmission belt 16 movably connected to the outer surface of the power shaft 15, and a steering gear 17 movably connected to the inner surface of the transmission belt 16. By rotating the car steering wheel, the drive rod 1 connected to the steering wheel is driven to rotate, thereby causing the torque sensor 11 to detect torque, which is then transmitted to the inside of the controller 14 via an electrical signal. Thus, the controller 14 controls the steering gear 17 to work by driving the power shaft 15 and the transmission belt 16 via the motor, thereby assisting in electric power steering.

[0032] The lubrication mechanism includes a power screw 2 movably connected to the inner surface of the steering gear 17, a connecting rod 21 fixedly connected to the outer surface of the power screw 2, a transmission gear plate 22 fixedly connected to the end of the connecting rod 21 away from the power screw 2, a lower fixed cover 23 fixedly connected to the side of the transmission cylinder 12 away from the drive rod 1, an auxiliary oil tank 24 fixedly connected to the outer surface of the lower fixed cover 23, a fixed arm 25 fixedly connected to the inner surface of the auxiliary oil tank 24, an oil collection cylinder 26 fixedly connected to the outer surface of the fixed arm 25, an oil sucker rod 27 fixedly connected to the inner surface of the fixed arm 25, and an oil wiping cotton 28 fixedly connected to the inner surface of the oil collection cylinder 26. Through the setting of the lubrication mechanism, the device can lubricate and maintain the gear parts during the steering process of the car, thereby reducing the damage rate of the parts.

[0033] Furthermore, the end of the drive rod 1 near the transmission cylinder 12 is connected to the transmission gear plate 22 inside the transmission cylinder 12 via a gear. A dynamic pressure mechanism is provided inside the lower fixed cover 23, including an oil storage tank 3. An upper oil port 31 is fixedly connected to the outer surface of the lower fixed cover 23, and an oil seal cover 32 is movably connected to the upper surface of the upper oil port 31. A lower oil pipe 33 is fixedly connected to the lower end of the oil storage tank 3, and a pump oil chamber 34 is fixedly connected to the end of the lower oil pipe 33 away from the oil storage tank 3. A pump oil rod 35 is movably connected to the inner surface of the pump oil chamber 34, and a pump oil pipe 36 is fixedly connected to the lower end of the pump oil chamber 34. The pump oil pipe 36 is located away from the pump oil chamber. One end of 34 is provided with a check valve chamber 37, and the upper end of the check valve chamber 37 is provided with a fixing block 38. The inner surface of the fixing block 38 is fixedly connected with an oil delivery pipe 39. The outer surface of the pump rod 35 is fixedly connected with a linkage arm plate 310. The outer surface of the connecting rod 21 is fixedly connected with a connecting plate 311. The end of the connecting plate 311 away from the connecting rod 21 is fixedly connected with a push plate 312. Through the setting of the dynamic pressure mechanism, the power is utilized during the turning process of the car, so that part of the power is provided to the pumping of lubricating oil, thereby ensuring that the device can achieve the effect of lubrication by delivering small amounts of lubricating oil multiple times after extending the delivery distance of the lubricating oil.

[0034] Furthermore, the power screw 2 is fixedly connected to the transmission gear plate 22 via the connecting rod 21. The transmission cylinder 12 is cylindrical in shape and has a hollow internal structure. The connecting rod 21 is movably connected to the inside of the transmission cylinder 12. Parts of the power screw 2 and the transmission gear plate 22 are movably connected to the inside of the transmission cylinder 12. Parts of the torque sensor 11 mesh with the transmission gear plate 22 inside the transmission cylinder 12, thereby driving it to achieve basic transmission, thus ensuring that the basic steering power of the device is provided by human power.

[0035] Furthermore, the lower fixed cover 23 is rectangular in shape, and there are two sets of auxiliary oil tanks 24. The two sets of auxiliary oil tanks 24 are located on both sides of the lower fixed cover 23. The interior of the auxiliary oil tank 24 is hollow. The auxiliary oil tank 24 is fixedly connected to the oil collection cylinder 26 through the fixed arm 25. The oil collection cylinder 26 is set to stably place it at the upper end of the gear mechanism, thereby ensuring that the gear can be in contact with the internal oil-wiping soft cotton 28 for oiling during the movement.

[0036] Furthermore, a portion of the oil-absorbing core rod 27 is located inside the auxiliary oil chamber 24. The oil-absorbing core rod 27 is abutted against and connected to the oil-wiping cotton 28. The oil-collecting cylinder 26 is cylindrical in shape and has a hollow internal structure. The interior of the oil-absorbing core rod 27 is filled with oil-absorbing cotton. The oil-wiping cotton 28 and a portion of the oil-absorbing core rod 27 are located inside the oil-collecting cylinder 26. The oil-wiping cotton 28 is in two sets. One set of oil-wiping cotton 28 is in contact with the helical teeth of the power screw 2, and the other set of oil-wiping cotton 28 is in contact with the rack of the transmission gear plate 22. Through the setting of the oil-absorbing core rod 27, the lubricating oil inside the auxiliary oil chamber 24 can be transported to the interior of the oil-collecting cylinder 26, thereby immersing the oil-wiping cotton 28 in oil.

[0037] Furthermore, a rectangular slot is provided at the outer end of the lower fixed cover 23, and the upper oil port 31 is located at the outer end of the rectangular slot of the lower fixed cover 23. A round hole is opened at the lower end of the oil storage tank 3, and the lower oil pipe 33 is fixedly connected to the round hole of the oil storage tank 3. The pump oil tank 34 is cylindrical in shape and has a hollow structure inside. The oil storage tank 3 is connected to the inside of the pump oil tank 34 through the lower oil pipe 33. Through the setting of the pump oil tank 34, the lubricating oil inside the oil storage tank 3 is introduced into its interior, and the pumping effect is achieved through the pump rod 35.

[0038] Furthermore, the pump rod 35 is cylindrical in shape, with a portion of the pump rod 35 located inside the pump oil chamber 34. The pump rod 35 and the pump oil chamber 34 can slide relative to each other. A circular hole is provided at the lower end of the pump oil chamber 34. The pump oil pipe 36 is fixedly connected to the circular hole portion of the pump oil chamber 34. The pump oil chamber 34 is connected to the interior of the check valve chamber 37 through the pump oil pipe 36. The check valve chamber 37 is connected to the interior of the auxiliary oil chamber 24 through the fixing block 38. Through the arrangement of the pump rod 35, the interior of the pump oil chamber 34 can be filled with lubricating oil during the lateral sliding process of the pump rod 35. When the pump rod 35 moves back, it can compress the lubricating oil into the interior of the pump oil pipe 36.

[0039] Furthermore, a rectangular movable groove is provided on the side of the lower fixed cover 23 away from the upper oil port 31. The linkage arm plate 310 passes through the rectangular movable groove of the lower fixed cover 23. A rectangular movable groove is provided at the upper end of the transmission cylinder 12. The connecting plate 311 passes through the rectangular movable groove of the transmission cylinder 12. The connecting rod 21 is fixedly connected to the push plate 312 through the connecting plate 311. The push plate 312 can abut against the linkage arm plate 310. With the setting of the oil seal cover 32, the lateral movement of the car steering control pump rod 35 requires a certain stroke, so that the pump rod 35 will not move frequently.

[0040] Working principle: The device is installed inside the car. When the steering wheel is turned, it drives the drive rod 1 to rotate. The drive rod 1 then engages with the transmission gear 22 through the lower gear, causing the transmission gear 22 to slide laterally. Simultaneously, the torque sensor 11 detects the torque of the drive rod 1 and transmits the signal to the controller 14. The controller 14 then drives the power shaft 15 through an internal motor, which in turn drives the transmission belt 16, thereby controlling the steering gear 17 to rotate. This, in turn, drives the power screw 2, thus assisting the car's steering. While the power screw 2 and the transmission gear 22 are moving laterally, the upper teeth of the screw contact the lubricating cotton 28, which lubricates the gears. This process helps maintain the steering angle of the car. When the volume is large, the lateral movement distance of the push plate 312 will be greater, which will cause it to abut against the linkage arm plate 310, thereby pushing the linkage arm plate 310 to move. This will cause the pump rod 35 inside to slide laterally, thereby opening the opening at the upper end of the pump oil chamber 34 on one side. The lubricating oil inside the oil storage chamber 3 will be sent into the pump oil chamber 34. After the pump rod 35 moves back, it will pump the lubricating oil inside the pump oil chamber 34 into the pump oil pipe 36. The lubricating oil in the pump oil pipe 36 will be sent into the check valve chamber 37. After multiple pumping, the lubricating oil will be pumped into the auxiliary oil chamber 24 through the oil delivery pipe 39. Under the capillary action of the oil-absorbing cotton inside the oil-suction core rod 27, it will be sent to the upper end of the oil-wiping soft cotton 28 to replenish the oil volume, thereby completing the automatic oiling effect within a certain period of time.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An electric power steering system for automobiles, characterized in that, include: The main body includes a drive rod (1), a torque sensor (11) is fixedly connected to the outer surface of the drive rod (1), a transmission cylinder (12) is provided at the lower end of the drive rod (1), a wire (13) is fixedly connected to the outer surface of the torque sensor (11), a controller (14) is fixedly connected to the end of the wire (13) away from the torque sensor (11), a power shaft (15) is movably connected to the inside of the controller (14) through a motor, a transmission belt (16) is movably connected to the outer surface of the power shaft (15), and a steering gear (17) is movably connected to the inner surface of the transmission belt (16). The lubrication mechanism includes a power screw (2) movably connected to the inner surface of a steering gear (17), a connecting rod (21) fixedly connected to the end of the power screw (2), a transmission gear plate (22) fixedly connected to the end of the connecting rod (21) away from the power screw (2), a lower fixed cover (23) fixedly connected to the side of the transmission cylinder (12) away from the drive rod (1), an auxiliary oil tank (24) fixedly connected to the outer surface of the lower fixed cover (23), a fixed arm (25) fixedly connected to the inner surface of the auxiliary oil tank (24), an oil collection cylinder (26) fixedly connected to the outer surface of the fixed arm (25), an oil sucker rod (27) fixedly connected to the inner surface of the fixed arm (25), and an oil wiping cotton (28) fixedly connected to the inner surface of the oil collection cylinder (26).

2. The electric power steering device for automobiles according to claim 1, characterized in that: The drive rod (1) is connected to the transmission cylinder (12) via a gear at one end near the transmission cylinder (12). A dynamic pressure mechanism is provided inside the lower fixed cover (23), including an oil reservoir (3). An upper oil port (31) is fixedly connected to the outer surface of the lower fixed cover (23), and an oil seal cap (32) is movably connected to the upper surface of the upper oil port (31). A lower oil pipe (33) is fixedly connected to the lower end of the oil reservoir (3), and a pump oil chamber (34) is fixedly connected to the end of the lower oil pipe (33) away from the oil reservoir (3). The inner surface of the pump oil chamber (34) is movably connected to... A pump rod (35) is connected to the pump oil chamber (34). A pump oil pipe (36) is fixedly connected to the lower end of the pump oil chamber (34). A check valve chamber (37) is provided at the end of the pump oil pipe (36) away from the pump oil chamber (34). A fixing block (38) is provided at the upper end of the check valve chamber (37). An oil delivery pipe (39) is fixedly connected to the inner surface of the fixing block (38). A linkage arm plate (310) is fixedly connected to the outer surface of the pump rod (35). A connecting plate (311) is fixedly connected to the outer surface of the connecting rod (21). A push plate (312) is fixedly connected to the end of the connecting plate (311) away from the connecting rod (21).

3. The electric power steering device for automobiles according to claim 1, characterized in that: The power screw (2) is fixedly connected to the transmission gear plate (22) via the connecting rod (21). The transmission cylinder (12) is cylindrical in shape and has a hollow interior. The connecting rod (21) is movably connected to the interior of the transmission cylinder (12). Parts of the power screw (2) and the transmission gear plate (22) are movably connected to the interior of the transmission cylinder (12).

4. The electric power steering device for automobiles according to claim 1, characterized in that: The lower fixed cover (23) is rectangular in shape, and the auxiliary oil tank (24) is in two sets. The two sets of auxiliary oil tanks (24) are located on both sides of the lower fixed cover (23). The interior of the auxiliary oil tank (24) is hollow. The auxiliary oil tank (24) is fixedly connected to the oil collection cylinder (26) through the fixed arm (25).

5. The electric power steering device for automobiles according to claim 1, characterized in that: Part of the oil sucker rod (27) is located inside the auxiliary oil tank (24). The oil sucker rod (27) and the oil wiping cotton (28) are connected in abutment. The oil collecting cylinder (26) is cylindrical in shape and has a hollow structure inside. The oil sucker rod (27) is filled with oil-absorbing cotton. Part of the oil wiping cotton (28) and the oil sucker rod (27) are located inside the oil collecting cylinder (26). The oil wiping cotton (28) is in two sets. One set of the oil wiping cotton (28) is attached to the helical teeth of the power screw (2), and the other set of the oil wiping cotton (28) is attached to the rack of the transmission gear plate (22).

6. The electric power steering device for automobiles according to claim 2, characterized in that: The lower fixed cover (23) has a rectangular slot at its outer end. The upper oil port (31) is located at the outer end of the rectangular slot of the lower fixed cover (23). The lower end of the oil storage tank (3) has a round hole. The lower oil pipe (33) is fixedly connected to the round hole of the oil storage tank (3). The pump oil tank (34) is cylindrical in shape. The interior of the pump oil tank (34) is hollow. The oil storage tank (3) is connected to the interior of the pump oil tank (34) through the lower oil pipe (33).

7. The electric power steering device for automobiles according to claim 2, characterized in that: The pump rod (35) is cylindrical in shape, and part of the pump rod (35) is located inside the pump oil chamber (34). The pump rod (35) and the pump oil chamber (34) can slide relative to each other. A circular hole is opened at the lower end of the pump oil chamber (34). The pump pipe (36) is fixedly connected to the circular hole of the pump oil chamber (34). The pump oil chamber (34) is connected to the interior of the check valve chamber (37) through the pump pipe (36). The check valve chamber (37) is connected to the interior of the auxiliary oil chamber (24) through the fixing block (38).

8. The electric power steering device for automobiles according to claim 2, characterized in that: The lower fixed cover (23) has a rectangular movable groove on the side away from the upper oil port (31). The linkage arm plate (310) is connected to the rectangular movable groove of the lower fixed cover (23). The upper end of the transmission cylinder (12) has a rectangular movable groove. The connecting plate (311) is connected to the rectangular movable groove of the transmission cylinder (12). The connecting rod (21) is fixedly connected to the push plate (312) through the connecting plate (311). The push plate (312) can abut against the linkage arm plate (310).

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