Intermediate connection steering shaft for automobile and preparation method of intermediate connection steering shaft

Abstract

The invention discloses an automobile intermediate connection steering shaft and a preparation method thereof.The automobile intermediate connection steering shaft comprises a hollow pipe, a pipe expanding structure is integrally formed at one end of the hollow pipe, a spline structure is integrally formed on the outer wall of the other end of the hollow pipe, and a coupler is integrally formed on the pipe expanding structure; a first knurling structure, a second knurling structure and a connecting shaft are integrally formed on the coupler, an input shaft is arranged on the outer side of the spline structure, a connector is integrally formed in the position, located at the end of the spline structure, of the hollow pipe, and a composite reinforcing piece is integrally formed on the outer wall of the hollow pipe. According to the intermediate connection steering shaft for the automobile and the preparation method of the intermediate connection steering shaft, the hollow pipe cold extrusion forming process is adopted, the size precision of a manufactured product is higher than that of a forged product, meanwhile, the weight of the product is much reduced compared with that of a solid forging product, the cost is also reduced, and meanwhile the productivity efficiency of the cold extrusion process is far higher than that of the forged product.

Description

Technical Field

[0001] The invention relates to the field of automobile parts, and in particular to an intermediate connecting steering shaft for an automobile and a preparation method thereof. Background Art

[0002] The intermediate connecting steering shaft for automobiles is a structure for steering connection in the steering column system of an automobile. The intermediate connecting steering shaft is a component in the steering system. It is used in the steering column and is connected to the input shaft of the steering wheel and the intermediate shaft. It is used to transmit the rotation of the steering wheel to the steering system of the chassis to control the steering of the front tires. It is a physical transmission component. With the continuous development of science and technology, people have higher and higher requirements for the manufacturing process of the intermediate connecting steering shaft for automobiles.

[0003] The existing intermediate connecting steering shaft for automobiles has certain disadvantages when in use. The traditional intermediate connecting steering shaft generally adopts a solid forged shaft, which mainly plays the following roles: connected with the input shaft through injection molding or plastic bushing, plays a sliding role, generally meets the sliding force of 20 to 50N; the end is connected to the intermediate shaft assembly through a yoke to meet the rigid connection under the durability test conditions. The existing products use a solid forging process, the product weight is too heavy, which increases the weight of the vehicle body, and it also does not conform to the lightweight development trend of new energy vehicles; the spline (6 teeth) forming process accuracy on the right side of the forging process product is not high, not as high as the cold extrusion forming process accuracy; the production efficiency of the forging process product is low, and the cold extrusion process capacity is increased by more than 2 times; for a single steering shaft with a longer length (such as more than 300mm), the forging process adopts a split production and welding form to ensure concentricity, half of which is forged, and then circumferentially welded into a whole, which affects the product strength and brings certain adverse effects to people's use process. For this reason, we propose an intermediate connecting steering shaft for automobiles and a preparation method thereof. Summary of the invention

[0004] Technical problem to be solved: In view of the shortcomings of the prior art, the present invention provides an intermediate connecting steering shaft for automobiles and a preparation method thereof, which adopts a hollow tube cold extrusion molding process. The dimensional accuracy of the product is higher than that of the forged product. At the same time, the weight of the product is much lighter than that of the solid forging, which also reduces the cost. At the same time, the production efficiency of the cold extrusion process is much greater than that of the forged product, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an intermediate connecting steering shaft for an automobile, comprising a hollow tube, one end of the hollow tube is integrally formed with a tube expansion structure, the other end of the hollow tube is integrally formed with a spline structure on the outer wall, a coupling is integrally formed on the tube expansion structure, a first knurled structure, a second knurled structure and a connecting shaft are integrally formed on the coupling, an input shaft is arranged on the outside of the spline structure, and a connector is integrally formed on the hollow tube at the end of the spline structure.

[0006] As a preferred technical solution of the present application, the outer wall of the hollow tube is integrally formed with a composite reinforcement sheet, and the composite reinforcement sheet includes a stainless steel plate, an aluminum plate, a PVC plate, a steel wire mesh sheet and a polyethylene sheet. The steel wire mesh sheet is located on the surface of the polyethylene sheet, the PVC plate is located on the surface of the steel wire mesh sheet, the aluminum plate is located on the surface of the PVC plate, and the stainless steel plate is located on the surface of the aluminum plate.

[0007] As a preferred technical solution of the present application, the hollow tube and the spline structure are integrally formed by a spline mold, and a spline mold cold extrusion molding method is adopted.

[0008] As a preferred technical solution of the present application, the hollow tube and the tube expansion structure are integrally formed through a tube expansion mechanism.

[0009] As a preferred technical solution of the present application, the expansion tube structure and the coupling are integrally formed by machining, the coupling and the connecting shaft are integrally formed by machining, and the coupling and the first knurled structure and the second knurled structure are integrally formed by knurling.

[0010] As a preferred technical solution of the present application, the hollow tube and the connector are integrally formed by machining.

[0011] As a preferred technical solution of the present application, the stainless steel plates, aluminum plates, PVC plates, steel wire mesh plates and polyethylene sheets are integrally formed into a composite reinforcement sheet by hot pressing, and the hollow tubes and the composite reinforcement sheet are integrally formed by hot pressing and coiling.

[0012] A method for preparing an intermediate connecting steering shaft for an automobile comprises the following steps:

[0013] S1: Tube rolling: Select the steering shaft steel and make a sheet steel of the same size as the steering shaft steel. The sheet steel is made of stainless steel plate, aluminum plate, PVC plate, steel wire mesh sheet and polyethylene sheet. The steering shaft steel and the sheet steel are hot-rolled to form a hollow tube;

[0014] S2: Spline forming: Position the prepared hollow tube to the processing position of the spline die, and use the spline die to cold extrude one end of the hollow tube;

[0015] S3: Tube expansion: After cold extrusion, the other end of the hollow tube is placed in the designated position of the tube expansion die for fixation, and the tube expansion mechanism is used for rapid tube expansion operation;

[0016] S4: Left end machining: After the tube expansion is completed, the expanded tube position is placed inside the machining mold, and the expanded tube position is knurled and machined;

[0017] S5: Machining of the right end: After the operation is completed, the end of the spline at the right end of the tube body is machined until the final shape is formed.

[0018] Beneficial effects: Compared with the prior art, the present invention provides an intermediate connecting steering shaft for automobiles and a preparation method thereof, which have the following beneficial effects: the intermediate connecting steering shaft for automobiles and a preparation method thereof, select steering shaft steel, and make sheet steel of the same size as the steering shaft steel, the sheet steel adopts stainless steel plate, aluminum plate, PVC plate, steel wire mesh sheet and polyethylene sheet, the steering shaft steel and the sheet steel are hot-rolled to form a hollow tube; the prepared hollow tube is positioned at the processing position of the spline mold, and one end of the hollow tube is cold-extruded by the spline mold; after cold-extrusion, the other end of the hollow tube is placed at the designated position of the tube expansion mold for fixing, and the tube expansion mechanism is used to perform a rapid tube expansion operation; after the tube expansion is completed, the expanded tube The position is placed inside the machine processing mold, and the expanded position is knurled and machined; after the operation is completed, the end of the spline on the right end of the tube body is machined until it is finally formed; the hollow tube cold extrusion forming process is adopted, and the dimensional accuracy of the product is higher than that of the forged product. At the same time, the weight of the product is much lighter than that of the solid forging, which also reduces the cost. At the same time, the production capacity efficiency of the cold extrusion process is much greater than that of the forged product. Due to the use of the hollow tube process, the product uses less material. Considering the production capacity and process issues, the unit price of the product will be reduced by more than 20%, reducing weight, reducing costs, increasing production capacity, improving production efficiency, and improving product accuracy. The entire automobile intermediate connecting steering shaft has a simple structure and is easy to operate, and the effect of use is better than that of the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the overall structure of an intermediate connecting steering shaft for an automobile and a preparation method thereof.

[0020] Figure 2 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for automobiles and a preparation method thereof.

[0021] Figure 3The present invention is a schematic structural diagram of the third embodiment of an intermediate connecting steering shaft for automobiles and a preparation method thereof.

[0022] Figure 4 The present invention is a schematic structural diagram of a composite reinforcement sheet in an intermediate connecting steering shaft for an automobile and a preparation method thereof.

[0023] Figure 5 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for an automobile and step S1 in a method for preparing the same.

[0024] Figure 6 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for an automobile and step S2 in a method for preparing the same.

[0025] Figure 7 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for an automobile and step S3 in a method for preparing the same.

[0026] Figure 8 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for an automobile and step S4 in a method for preparing the same.

[0027] Fig. 9 The present invention is a schematic structural diagram of an intermediate connecting steering shaft for an automobile and step S5 in a preparation method thereof.

[0028] In the figure: 1. hollow pipe; 2. spline structure; 3. input shaft; 4. connecting shaft; 5. first knurling structure; 6. second knurling structure; 7. coupling; 8. composite reinforcement sheet; 9. stainless steel plate; 10. aluminum plate; 11. PVC plate; 12. steel wire mesh; 13. polyethylene sheet; 14. expansion pipe structure; 15. connector. DETAILED DESCRIPTION

[0029] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1-9 As shown, an intermediate connecting steering shaft for automobiles comprises a hollow tube 1, one end of the hollow tube 1 is integrally formed with a tube expansion structure 14, the other end of the hollow tube 1 is integrally formed with a spline structure 2, a coupling 7 is integrally formed on the tube expansion structure 14, a first knurling structure 5, a second knurling structure 6 and a connecting shaft 4 are integrally formed on the coupling 7, an input shaft 3 is arranged on the outer side of the spline structure 2, and a connector 15 is integrally formed on the hollow tube 1 at the end of the spline structure 2.

[0033] Furthermore, the outer wall of the hollow tube 1 is integrally formed with a composite reinforcement sheet 8, and the composite reinforcement sheet 8 includes a stainless steel plate 9, an aluminum plate 10, a PVC plate 11, a steel wire mesh sheet 12 and a polyethylene sheet 13. The steel wire mesh sheet 12 is located on the surface of the polyethylene sheet 13, the PVC plate 11 is located on the surface of the steel wire mesh sheet 12, the aluminum plate 10 is located on the surface of the PVC plate 11, and the stainless steel plate 9 is located on the surface of the aluminum plate 10.

[0034] Furthermore, the hollow tube 1 and the spline structure 2 are integrally formed by a spline die, and a spline die cold extrusion molding method is adopted.

[0035] Furthermore, the hollow tube 1 and the tube expansion structure 14 are integrally formed through the tube expansion mechanism.

[0036] Furthermore, the expansion tube structure 14 and the coupling 7 are integrally formed by machining, the coupling 7 and the connecting shaft 4 are integrally formed by machining, and the coupling 7 and the first knurled structure 5 and the second knurled structure 6 are integrally formed by knurling.

[0037] Furthermore, the hollow tube 1 and the connector 15 are integrally formed by machining.

[0038] Furthermore, the stainless steel plate 9, the aluminum plate 10, the PVC plate 11, the steel wire mesh 12 and the polyethylene sheet 13 are integrally formed into a composite reinforcement sheet 8 by hot pressing, and the hollow tube 1 and the composite reinforcement sheet 8 are integrally formed by hot pressing and coiling.

[0039] A method for preparing an intermediate connecting steering shaft for an automobile comprises the following steps:

[0040] S1: Tube rolling: Select the steering shaft steel and make a sheet steel of the same size as the steering shaft steel. The sheet steel is made of stainless steel plate, aluminum plate, PVC plate, steel wire mesh sheet and polyethylene sheet. The steering shaft steel and the sheet steel are hot-rolled to form a hollow tube;

[0041] S2: Spline forming: Position the prepared hollow tube to the processing position of the spline die, and use the spline die to cold extrude one end of the hollow tube;

[0042] S3: Tube expansion: After cold extrusion, the other end of the hollow tube is placed in the designated position of the tube expansion die for fixation, and the tube expansion mechanism is used for rapid tube expansion operation;

[0043] S4: Left end machining: After the tube expansion is completed, the expanded tube position is placed inside the machining mold, and the expanded tube position is knurled and machined;

[0044] S5: Machining of the right end: After the operation is completed, the end of the spline at the right end of the tube body is machined until the final shape is formed.

[0045] Working principle: The present invention comprises a hollow tube 1, a spline structure 2, an input shaft 3, a connecting shaft 4, a first knurling structure 5, a second knurling structure 6, a coupling 7, a composite reinforcement sheet 8, a stainless steel plate 9, an aluminum plate 10, a PVC plate 11, a steel wire mesh sheet 12, a polyethylene sheet 13, a pipe expansion structure 14, and a connector 15. The steering shaft steel is selected and a sheet steel of the same size as the steering shaft steel is made. The sheet steel adopts stainless steel plates, aluminum plates, PVC plates, steel wire mesh sheets and polyethylene sheets. The steering shaft steel is connected to the The sheet steel is hot-rolled to form a hollow tube; the prepared hollow tube is positioned at the processing position of the spline die, and one end of the hollow tube is cold-extruded using the spline die; after cold extrusion, the other end of the hollow tube is placed in the designated position of the tube expansion die for fixation, and the tube expansion mechanism is used for rapid tube expansion; after tube expansion, the tube expansion position is placed inside the machine processing die, and the tube expansion position is knurled and machined; after the operation is completed, the end of the spline at the right end of the tube body is machined until it is finally formed.

[0046] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An intermediate connecting steering shaft for an automobile, comprising a hollow tube (1), characterized in that: One end of the hollow tube (1) is integrally formed with a tube expansion structure (14), the other end of the hollow tube (1) is integrally formed with a spline structure (2), the tube expansion structure (14) is integrally formed with a coupling (7), the coupling (7) is integrally formed with a first knurled structure (5), a second knurled structure (6) and a connecting shaft (4), an input shaft (3) is arranged on the outside of the spline structure (2), and a connector (15) is integrally formed on the hollow tube (1) at a position located at the end of the spline structure (2).

2. The intermediate connecting steering shaft for automobile according to claim 1, characterized in that: The outer wall of the hollow tube (1) is integrally formed with a composite reinforcement sheet (8), the composite reinforcement sheet (8) comprising a stainless steel sheet (9), an aluminum sheet (10), a PVC sheet (11), a steel wire mesh sheet (12) and a polyethylene sheet (13), the steel wire mesh sheet (12) being located on the surface of the polyethylene sheet (13), the PVC sheet (11) being located on the surface of the steel wire mesh sheet (12), the aluminum sheet (10) being located on the surface of the PVC sheet (11), and the stainless steel sheet (9) being located on the surface of the aluminum sheet (10).

3. The intermediate connecting steering shaft for automobile according to claim 1, characterized in that: The hollow tube (1) and the spline structure (2) are integrally formed by a spline die, and a spline die cold extrusion molding method is adopted.

4. The intermediate connecting steering shaft for automobile according to claim 1, characterized in that: The hollow tube (1) and the tube expansion structure (14) are integrally formed via a tube expansion mechanism.

5. The intermediate connecting steering shaft for automobile according to claim 1, characterized in that: The expansion tube structure (14) and the coupling (7) are integrally formed by machining, the coupling (7) and the connecting shaft (4) are integrally formed by machining, and the coupling (7) and the first knurled structure (5) and the second knurled structure (6) are integrally formed by knurling.

6. The intermediate connecting steering shaft for automobile according to claim 1, characterized in that: The hollow tube (1) and the connector (15) are integrally formed by machining.

7. The intermediate connecting steering shaft for automobile according to claim 2, characterized in that: The stainless steel plate (9), the aluminum plate (10), the PVC plate (11), the steel wire mesh sheet (12) and the polyethylene sheet (13) are integrally formed into a composite reinforcement sheet (8) by hot pressing, and the hollow tube (1) and the composite reinforcement sheet (8) are integrally formed by hot pressing and coiling.

8. A method for preparing an intermediate connecting steering shaft for an automobile, characterized in that: The steps include: S1: Tube rolling: Select the steering shaft steel and make a sheet steel of the same size as the steering shaft steel. The sheet steel is made of stainless steel plate, aluminum plate, PVC plate, steel wire mesh sheet and polyethylene sheet. The steering shaft steel and the sheet steel are hot-rolled to form a hollow tube; S2: Spline forming: Position the prepared hollow tube to the processing position of the spline die, and use the spline die to cold extrude one end of the hollow tube; S3: Tube expansion: After cold extrusion, the other end of the hollow tube is placed in the designated position of the tube expansion die for fixation, and the tube expansion mechanism is used for rapid tube expansion operation; S4: Left end machining: After the tube expansion is completed, the expanded tube position is placed inside the machining mold, and the expanded tube position is knurled and machined; S5: Machining of the right end: After the operation is completed, the end of the spline at the right end of the tube body is machined until the final shape is formed.

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