A steering worm in an electric power steering system of an automobile

Abstract

The utility model is applicable to the technical field of automobile parts, and provides a steering worm in an automobile electric power steering system, including: a worm body, the worm body including: an inner spline rod and a cylindrical rod; a cylindrical rod is arranged at one end of the inner spline rod; an inner spline is provided inside the end of the inner spline rod away from the cylindrical rod, an annular groove is provided at both ends of the inner spline of the inner spline rod, and a rubber retaining ring is arranged inside the annular groove. The steering worm in an automobile electric power steering system provided by the utility model is connected to the motor through the inner spline by arranging the inner spline, the annular groove and the rubber retaining ring, and other connecting parts are reduced, the structure is more compact, and the rigidity and guiding performance are better; in addition, an annular groove is designed inside the worm body to place the rubber retaining ring, which not only does not occupy the space outside the worm, but also can play a buffering role, reduces the wear between parts, and increases the service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and in particular relates to a steering worm in an automobile electric power steering system. Background Art

[0002] The steering worm in the electric power steering system of an automobile generally adopts a smooth axis worm, which is connected to the motor end by press-fitting or coupling. Due to the addition of connecting components, the coaxiality is inevitably increased, and the centering and guiding performance are poor. In addition, this connection method has a non-compact structure, which causes the worm to move axially during movement, accelerating the wear of parts and reducing the service life. Utility Model Content

[0003] The utility model provides a steering worm in an electric power steering system of an automobile, aiming to solve the problem that the current optical axis worm has additional connecting parts, which inevitably increases the coaxiality and has poor centering and guiding properties; in addition, this connection method has a non-compact structure, which causes the worm to move axially during movement, accelerates the wear of parts, and reduces the service life.

[0004] The utility model is implemented as follows: a steering worm in an electric power steering system of an automobile comprises: a worm body, the worm body comprising: an inner spline rod and a cylindrical rod; one end of the inner spline rod is provided with a cylindrical rod; an inner spline is provided inside the end of the inner spline rod away from the cylindrical rod, an annular groove is provided at both ends of the inner spline of the inner spline rod, and a rubber retaining ring is provided inside the annular groove; an extension mechanism for adjusting the overall length of the worm body is provided between the inner spline rod and the cylindrical rod.

[0005] Preferably, the extension mechanism includes: four first extension rods are evenly fixedly connected to one side of the internal spline rod close to the cylindrical rod, and four second extension rods are evenly fixedly connected to one side of the cylindrical rod close to the first extension rod; the first extension rods and the second extension rods are alternately arranged, and the first extension rods and the second extension rods are slidingly connected; a rotating mechanism for controlling the extension and retraction of the worm body is provided between the four first extension rods.

[0006] Preferably, the rotating mechanism includes: a screw rod is arranged between the four first extension rods, one end of the screw rod is rotatably connected to the cylindrical rod; the outer surface of the screw rod is threadedly connected to an internal threaded sleeve, one end of the internal threaded sleeve is fixedly connected to the internal spline rod.

[0007] Preferably, one end of the screw rod close to the cylindrical rod passes through the cylindrical rod and extends to the inside of the circular hole, and one end of the screw rod located inside the circular hole is fixedly connected to a hexagonal block.

[0008] Preferably, both sides of the first extension rod close to one end of the cylindrical rod are fixedly connected with sliders, and the second extension rod close to the slider is provided with a matching sliding groove, and the slider is slidably connected to the sliding groove.

[0009] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0010] By setting up internal splines, annular grooves and rubber retaining rings, the connection with the motor is achieved through the internal splines, reducing other connecting parts, making the structure more compact, and improving rigidity and guidance. In addition, an annular groove is designed inside the worm body to place the rubber retaining ring, which not only does not occupy the space outside the worm, but also can play a buffering role, reducing wear between parts and increasing service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of the worm body of the utility model;

[0013] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0014] Figure 4 This is a schematic diagram of the extension mechanism structure of the utility model;

[0015] Figure 5 This is a schematic diagram of the internal structure of the internal spline rod of the utility model;

[0016] Figure 6 This is a connection diagram of the first extension rod and the inner spline rod of the utility model.

[0017] In the figure: 1. Worm body; 2. Internal spline rod; 3. Cylindrical rod; 4. Internal spline; 5. Annular groove; 6. Rubber retaining ring; 7. Extension mechanism; 8. First extension rod; 9. Second extension rod; 10. Rotation mechanism; 11. Screw; 12. Internal threaded sleeve; 13. Circular hole; 14. Hexagonal block; 15. Slider; 16. Slide groove. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] The present invention provides a steering worm in an electric power steering system of an automobile. Figure 1-6 As shown, it includes: a worm body 1, which includes: an internal spline rod 2 and a cylindrical rod 3; the cylindrical rod 3 is provided at one end of the internal spline rod 2; an internal spline 4 is provided inside the end of the internal spline rod 2 away from the cylindrical rod 3, and an annular groove 5 is provided at both ends of the internal spline rod 2 close to the internal spline 4, and a rubber retaining ring 6 is provided inside the annular groove 5; an extension mechanism 7 for adjusting the overall length of the worm body 1 is provided between the internal spline rod 2 and the cylindrical rod 3.

[0021] It should be noted that the user connects to the output end of the motor through the internal spline 4 inside the worm body 1, which reduces other connecting components, makes the structure more compact, and has better rigidity and guidance. In addition, an annular groove 5 is designed inside the worm body 1 to place the rubber retaining ring 6, which does not occupy the space outside the worm body 1 and can play a buffering role, reducing the wear between parts and increasing the service life. It solves the problem that the current optical axis worm has added connecting components, the coaxiality is inevitably increased, and the centering and guidance are poor. In addition, this connection method has a not compact structure, which causes the worm to move axially during movement, accelerates the wear of parts, and reduces the service life.

[0022] In a further preferred embodiment of the present invention, Figure 1 、 4As shown in , 6, the extension mechanism 7 includes: four first extension rods 8 are evenly fixedly connected to the side of the inner spline rod 2 close to the cylindrical rod 3, and four second extension rods 9 are evenly fixedly connected to the side of the cylindrical rod 3 close to the first extension rod 8; the first extension rods 8 and the second extension rods 9 are staggered and slidably connected to each other; a rotating mechanism 10 for controlling the extension and retraction of the worm body 1 is provided between the four first extension rods 8.

[0023] In this embodiment, the user can control the increase of the distance between the cylindrical rod 3 and the internal spline rod 2 through the rotating mechanism 10 according to the distance between the two components. At the same time, when the output end of the motor drives the internal spline rod 2 to rotate, the internal spline rod 2 drives the second extension rod 9 through the first extension rod 8, and the second extension rod 9 drives the cylindrical rod 3 to rotate. This can extend the worm body 1 without affecting the transmission function of the worm body 1, thereby improving practicality.

[0024] In a further preferred embodiment of the present invention, Figure 2 As shown, the rotating mechanism 10 includes: a screw rod 11 is arranged between the four first extension rods 8, one end of the screw rod 11 is rotatably connected to the cylindrical rod 3; the outer surface of the screw rod 11 is threadedly connected to an internal threaded sleeve 12, one end of the internal threaded sleeve 12 is fixedly connected to the internal spline rod 2.

[0025] In this embodiment, the screw 11 is rotated, and the screw 11 pushes the internal threaded sleeve 12 on its surface while rotating. The internal threaded sleeve 12 drives the internal spline rod 2, so that the internal spline rod 2 moves away from the cylindrical rod 3, thereby achieving the purpose of controlling the extension and retraction of the worm body 1.

[0026] In a further preferred embodiment of the present invention, Figure 2 As shown, one end of the screw rod 11 close to the cylindrical rod 3 passes through the cylindrical rod 3 and extends to the inside of the circular hole 13 , and one end of the screw rod 11 located inside the circular hole 13 is fixedly connected to a hexagonal block 14 .

[0027] In this embodiment, the user can insert a suitable hexagonal socket into the circular hole 13, and put the hexagonal socket on the outer surface of the hexagonal block 14, and then rotate the hexagonal socket with a wrench. The hexagonal socket drives the hexagonal block 14 to rotate, and the hexagonal block 14 drives the screw 11 to rotate, so that the user can manually adjust the length of the worm body 1.

[0028] In a further preferred embodiment of the present invention, Figure 4 、 6 As shown, sliders 15 are fixedly connected to both sides of the first extension rod 8 near one end of the cylindrical rod 3, and matching sliding grooves 16 are provided on the second extension rod 9 near the sliding grooves 15, and the sliding grooves 15 are slidably connected to the sliding grooves 16.

[0029] In this embodiment, the movement stroke of the inner spline rod 2 can be limited to prevent the first extension rod 8 from being separated from the second extension rod 9, which would cause the worm body 1 to lose its transmission function.

[0030] It should be noted that for the aforementioned embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0031] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative, such as the division of the above-mentioned units. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the coupling or communication connection between each other shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0032] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope to be protected by the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making any creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also fall within the scope to be protected by the present invention.

Claims

1. A steering worm in an electric power steering system of an automobile, comprising: A worm body (1), the worm body (1) comprising: an internal spline rod (2) and a cylindrical rod (3); the cylindrical rod (3) is provided at one end of the internal spline rod (2); The invention is characterized in that an internal spline (4) is provided inside the end of the internal spline rod (2) away from the cylindrical rod (3), an annular groove (5) is provided at both ends of the internal spline rod (2) close to the internal spline (4), and a rubber retaining ring (6) is provided inside the annular groove (5); An extension mechanism (7) for adjusting the overall length of the worm body (1) is provided between the internal spline rod (2) and the cylindrical rod (3).

2. The steering worm in the electric power steering system of an automobile as claimed in claim 1, characterized in that: The extending mechanism (7) comprises: Four first extension rods (8) are evenly fixedly connected to one side of the inner spline rod (2) close to the cylindrical rod (3), and four second extension rods (9) are evenly fixedly connected to one side of the cylindrical rod (3) close to the first extension rod (8); The first extension rod (8) and the second extension rod (9) are arranged alternately, and the first extension rod (8) and the second extension rod (9) are slidably connected; A rotating mechanism (10) for controlling the extension and retraction of the worm body (1) is arranged between the four first extension rods (8).

3. The steering worm in the electric power steering system of an automobile as claimed in claim 2, characterized in that: The rotating mechanism (10) comprises: A screw rod (11) is provided between the four first extension rods (8), and one end of the screw rod (11) is rotatably connected to the cylindrical rod (3); The outer surface of the screw rod (11) is threadedly connected to an internal thread sleeve (12), and one end of the internal thread sleeve (12) is fixedly connected to the internal spline rod (2).

4. The steering worm in the electric power steering system of an automobile as claimed in claim 3, characterized in that: One end of the screw rod (11) close to the cylindrical rod (3) passes through the cylindrical rod (3) and extends to the inside of the circular hole (13); one end of the screw rod (11) located inside the circular hole (13) is fixedly connected to a hexagonal block (14).

5. The steering worm in the electric power steering system of an automobile as claimed in claim 2, characterized in that: Both sides of the first extension rod (8) close to one end of the cylindrical rod (3) are fixedly connected with sliders (15), and the second extension rod (9) close to the slider (15) is provided with a matching slide groove (16), and the slider (15) is slidably connected to the slide groove (16).

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