High-precision and high-efficiency rear wheel steering lead screw small assembly

Abstract

The utility model provides a high-precision and high-efficiency rear wheel steering lead screw small assembly, and belongs to the technical field of automobile accessories. The problem that an existing steering lead screw is short in service life is solved. The high-precision and high-efficiency rear wheel steering lead screw small assembly comprises a bearing inner layer, a nut is fixedly installed in an inner cavity of the bearing inner layer, a belt wheel is movably installed on the right side of the bearing inner layer, the left side of the surface of the nut is movably sleeved with a locking ring, and an oil seal ring is fixedly installed in an inner cavity of the nut; an inner cavity of the nut is connected with a transmission lead screw through a micron-sized precise trapezoid thread, and mounting screws are fixedly mounted at the two ends of the transmission lead screw. The transmission device has the advantages of high transmission precision, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile parts, especially relates to a high-precision and high-efficiency rear wheel steering screw rod small assembly. BACKGROUND

[0002] The steering transmission screw rod is an important part in the automobile steering mechanism, which directly affects the stability of automobile control, the safety of operation and the service life of tires. The rear wheel steering screw rod small assembly is needed in the steering system to perform the rear wheel steering operation, but the existing rear wheel steering transmission screw rod assembly usually adopts the galvanizing treatment method to increase the corrosion resistance of the surface of the part during production. The galvanizing processing mainly improves the corrosion resistance, wear resistance and aesthetic degree of the metal. If the surface of the part is impacted by the outside world, the galvanized layer is prone to fall off, which can affect the service life of the part. During steering, the rolling screw transmission mode is usually used for steering operation. If the equipment is subjected to a large impact load, plastic deformation may occur between the rolling ball and the raceway, affecting the transmission accuracy and performance. SUMMARY

[0003] The utility model discloses a kind of high-precision and high-efficiency rear wheel steering screw rod small assemblies, which are connected by micron precision ladder thread and treated by nitrogen-carbon co-diffusion heat treatment to solve the above problems in the prior art.

[0004] The utility model discloses a kind of high-precision and high-efficiency rear wheel steering screw rod small assemblies, which are connected by micron precision ladder thread and treated by nitrogen-carbon co-diffusion heat treatment to solve the above problems in the prior art.

[0005] The high-precision and high-efficiency rear wheel steering screw rod small assembly can be made of high-strength alloy material by the cooperation of the nut, belt pulley, clamping block, locking ring, transmission screw rod, oil seal ring, plugging ring and positioning groove. The surface of the nut and transmission screw rod is treated by nitrogen-carbon co-diffusion heat treatment, which increases the surface hardness and wear resistance of the parts, achieving high strength and long service life.

[0006] In the aforementioned high-precision and high-efficiency rear wheel steering screw sub-assembly, a sealing ring is movably fitted onto the surface of the mounting screw, and the bearing outer layer is fixedly mounted to the surface of the inner bearing layer by bolts. In practical applications, the sealing ring can seal the connection between the mounting screw and the steering assembly, preventing external dust from freely entering the assembly.

[0007] In the aforementioned high-precision and high-efficiency rear wheel steering screw sub-assembly, there are two sealing rings. The inner cavity of each sealing ring is fixedly connected with a threaded sleeve. An outward-facing cover is fixedly installed on opposite sides of both sealing rings. In practical applications, the outward-facing cover can wrap around the connection of the steering component during use and can cooperate with the sealing ring to seal the connection. The threaded sleeve can be threadedly connected to the mounting screw.

[0008] In the aforementioned high-precision and high-efficiency rear wheel steering screw subassembly, the inner wall of the locking ring is threadedly connected to the surface of the nut, and the left-side bearing of the pulley is fixedly connected to the inner layer of the bearing. In practical applications, the inner layer of the bearing facilitates the installation and use of the transmission screw, allowing it to be mounted on the vehicle.

[0009] In the aforementioned high-precision and high-efficiency rear wheel steering screw sub-assembly, a locking block is fixedly mounted on the surface of the nut, and a positioning groove is formed in the inner cavity of the pulley. In practical applications, the locking block engages with the positioning groove so that the pulley drives the nut to rotate.

[0010] In the aforementioned high-precision and high-efficiency rear wheel steering screw subassembly, both the drive screw and the nut are made of high-strength alloy materials, and their surfaces undergo nitriding and carburizing heat treatment. Two oil seal rings and two sealing rings are used. In practical applications, the nitriding and carburizing heat treatment of the drive screw and nut increases their hardness, improves wear resistance, and enhances corrosion resistance and fatigue resistance.

[0011] In the aforementioned high-precision and high-efficiency rear wheel steering screw sub-assembly, a rotating plate is fixedly mounted on the surface of the locking ring, and there are several positioning grooves, locking blocks, and rotating plates. In practical applications, the rotating plate facilitates the user's rotation of the locking ring to install it onto the nut.

[0012] Compared with existing technologies, this high-precision and high-efficiency rear wheel steering screw sub-assembly adopts a trapezoidal thread structure. This results in relatively small frictional losses between the thread pairs when transmitting power, and can more effectively convert rotary motion into linear motion, thereby improving transmission efficiency. At the same time, the surface of the component is subjected to nitrocarburizing heat treatment to provide surface hardness and wear resistance, achieving high strength and long service life. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the front view of this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of this utility model.

[0016] Figure 4 This is a partial structural diagram of the present invention.

[0017] In the diagram, 1. Inner bearing layer; 2. Nut; 3. Pulley; 4. Clamping block; 5. Locking ring; 6. Drive screw; 7. Oil seal ring; 8. Mounting screw; 9. Sealing ring; 10. Outer bearing layer; 11. Positioning groove. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this high-precision and high-efficiency rear wheel steering screw assembly includes a bearing inner layer 1, a nut 2 fixedly installed in the inner cavity of the bearing inner layer 1, a pulley 3 movably installed on the right side of the bearing inner layer 1, a locking ring 5 movably sleeved on the left side of the surface of the nut 2, an oil seal ring 7 fixedly installed in the inner cavity of the nut 2, and a transmission screw 6 connected to the inner cavity of the nut 2 through a micron-level precision trapezoidal thread. Both ends of the transmission screw 6 are fixedly installed with mounting screws 8.

[0020] To elaborate further, a sealing ring 9 is movably fitted onto the surface of the mounting screw 8, and the bearing outer layer 10 is fixedly mounted onto the surface of the bearing inner layer 1 by bolts.

[0021] In actual manufacturing, there are two sealing rings 9. The inner cavity of the sealing ring 9 is fixedly connected with a threaded sleeve 13. An outward-facing cover 12 is fixedly installed on the opposite side of the two sealing rings 9. The threaded sleeve 13 is threaded onto the surface of the mounting screw 8. Both the sealing ring 9 and the outward-facing cover 12 are made of rubber material.

[0022] The inner wall of the locking ring 5 is threadedly connected to the surface of the nut 2, and the left bearing of the pulley 3 is fixedly connected to the inner layer 1 of the bearing. A locking block 4 is fixedly installed on the surface of the nut 2, and a positioning groove 11 is provided in the inner cavity of the pulley 3.

[0023] Both the lead screw 6 and the nut 2 are made of high-strength alloy material, and their surfaces are subjected to nitriding and carbonizing heat treatment. There are two oil seal rings 7 and two sealing rings 9. A rotating plate is fixedly installed on the surface of the locking ring 5. There are several positioning grooves 11, locking blocks 4, and rotating plates. High-temperature resistant grease is injected between the lead screw 6 and the nut 2.

[0024] In actual manufacturing, the operator first installs the equipment onto the steering gear via the outer bearing layer 10, and then installs the transmission screw 6 into the nut 2 via threads, so that the nut 2 and the transmission screw 6 are threadedly connected. During the threaded connection, the user then installs the locking ring 5 onto the surface of the nut 2 via threads, so that it can limit the nut 2. Subsequently, the transmission screw 6 is connected to the steering assembly via the mounting screw 8. During the connection, the sealing ring 9 will cooperate with the outer cover 12 to perform a sealing operation, preventing external dust from entering the steering assembly through the connection between the mounting screw 8 and the steering assembly. At the same time, during installation, the pulley 3 will also mesh with the steering motor, so that the steering motor drives the pulley 3 to rotate. When the pulley 3 rotates, it will drive the nut 2 to rotate, so that the nut 2 can drive the transmission screw 6 to move left and right via threads, so as to perform steering operations.

[0025] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A high-precision and high-efficiency rear wheel steering screw subassembly, comprising a bearing inner layer (1), characterized in that: The inner cavity of the bearing inner layer (1) is fixedly installed with a nut (2), the right side of the bearing inner layer (1) is movably installed with a belt pulley (3), the left side of the surface of the nut (2) is movably sleeved with a locking ring (5), the inner cavity of the nut (2) is fixedly installed with an oil seal ring (7), the inner cavity of the nut (2) is connected with a transmission screw rod (6) through a micron-level precision ladder thread, and both ends of the transmission screw rod (6) are fixedly installed with mounting screw rods (8). ​ 2. The high-precision and high-efficiency rear wheel steering lead screw small assembly according to claim 1, characterized in that, The surface of the mounting screw rod (8) is movably sleeved with a plugging ring (9), and the surface of the bearing inner layer (1) is fixedly installed with a bearing outer layer (10) through bolts.

3. The high-precision and high-efficiency rear wheel steering screw subassembly according to claim 2, characterized in that, The number of the plugging ring (9) is two, the inner cavity of the plugging ring (9) is fixedly connected with a threaded sleeve (13), and the opposite sides of the two plugging rings (9) are fixedly installed with outward turning covers (12).

4. The high-precision and high-efficiency rear wheel steering lead screw small assembly according to claim 1, characterized in that, The inner wall of the locking ring (5) is connected with the surface of the nut (2) through threads, and the left side bearing of the belt pulley (3) is fixedly connected with the bearing inner layer (1).

5. The high-precision and high-efficiency rear wheel steering screw subassembly according to claim 3, characterized in that, The surface of the nut (2) is fixedly installed with a clamping block (4), and the inner cavity of the belt pulley (3) is provided with a positioning groove (11).

6. The high-precision and high-efficiency rear wheel steering lead screw small assembly according to claim 2, characterized in that, The transmission screw rod (6) and the nut (2) are made of high-strength alloy material, and the surfaces thereof are treated by nitrogen-carbon co-diffusion and heat treatment, and the number of the oil seal ring (7) and the plugging ring (9) is two.

7. The high-precision and high-efficiency rear wheel steering screw subassembly according to claim 5, characterized in that, The surface of the locking ring (5) is fixedly installed with a twisting plate, and the number of the positioning groove (11), the clamping block (4) and the twisting plate is several.

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