Electric recirculating ball steering gear tail end limiting anti-pull-in structure

Abstract

The utility model discloses a tail end limiting anti-pull-in structure of an electric recirculating ball steering gear. The tail end limiting anti-pull-in structure comprises a shell, a steering assembly and a bearing assembly, wherein the steering assembly and the bearing assembly are arranged in the shell; the shell comprises a first accommodating part provided with the steering assembly and a second accommodating part provided with a bearing assembly; the bearing assemblies are both lower than the upper boss end face and the lower boss end face of the second containing part, and when the steering assembly moves in the first containing part and the second containing part, the steering assembly abuts against the upper boss end face and the lower boss end face of the second containing part so as to be prevented from making contact with bearing inner rings. The end face of the bearing assembly is arranged to be lower than the upper boss end face and the lower boss end face of the second containing part, so that the lead screw nut can make contact with the upper boss end face and the lower boss end face of the second containing part when moving to the upper limit position and the lower limit position, locking with the bearing inner ring is avoided, and the suction problem is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile steering, in particular to a kind of electric circulating ball steering gear end position limiting anti-suck-in structure. BACKGROUND

[0002] To reduce carbon emissions, actively promote the implementation of the national "double carbon" policy, and the new energy electric light truck market allocation rate also presents the situation of year-on-year growth. And electric circulating ball steering system, due to the advantages of cost, lightweight, can meet the demand of intelligent driving technology, has become the best choice of electric light truck.

[0003] Currently, for the end mechanical limiting of electric circulating ball steering gear, the existing design scheme in the current industry is through the contact of screw nut in steering gear and upper and lower bearing inner ring fixed on screw rod. When rotating input shaft, screw nut will move up and down while rotating with screw rod.

[0004] However, when screw nut moves to upper and lower limit position, it will contact with bearing inner ring on screw rod, because of inertia, screw nut and bearing inner ring on screw rod similar bolt nut structure will be directly locked, cannot automatically reset, leading to suck-in problem, need driver to rotate back to plate with certain reverse hand force to make it loose. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a kind of electric circulating ball steering gear end position limiting anti-suck-in structure, to solve the problem that screw nut moves to upper and lower limit position and contacts with bearing inner ring on screw rod, screw nut and bearing inner ring on screw rod similar bolt nut structure will be directly locked, cannot automatically reset, leading to suck-in.

[0006] To achieve the above-mentioned purpose, the utility model realizes through the following technical scheme: a kind of electric circulating ball steering gear end position limiting anti-suck-in structure, characterized by, the electric circulating ball steering gear end position limiting anti-suck-in structure includes shell, steering assembly and bearing assembly arranged in the shell;

[0007] Shell, including the first accommodating part for being provided with the steering assembly, and the second accommodating part provided with bearing assembly;

[0008] Wherein, the bearing assembly is lower than the upper and lower boss end face of the second accommodating part, and the steering assembly moves in the first accommodating part and the second accommodating part, by abutting on the upper and lower boss end face of the second accommodating part, to avoid contact with bearing inner ring.

[0009] In summary, according to the electric circulating ball steering gear end limiting anti-suck-in structure, the end face of the bearing assembly is arranged to be lower than the upper and lower boss end faces of the second accommodating portion, so that the screw nut is in contact with the upper and lower boss end faces of the second accommodating portion when moving to the upper and lower limit positions, thereby avoiding locking with the bearing inner ring and effectively solving the problem of suck-in.

[0010] According to an aspect of the above technical solution, the steering assembly includes a torsion bar arranged in the first accommodating portion, and an input shaft and a screw rod arranged at two ends of the torsion bar respectively, and the input shaft drives the screw rod to rotate in the second accommodating portion through the torsion bar.

[0011] According to an aspect of the above technical solution, the screw rod is provided with a threaded portion on part of the circumferential surface of the second accommodating portion, and a screw nut is movably connected to the threaded portion.

[0012] According to an aspect of the above technical solution, the shell is further provided with a plurality of locking nuts, and the plurality of locking nuts are arranged on both sides of the screw rod.

[0013] According to an aspect of the above technical solution, the bearing assembly includes an upper bearing arranged at one end of the second accommodating portion close to the first accommodating portion, and a lower bearing arranged at one end of the second accommodating portion away from the first accommodating portion.

[0014] According to an aspect of the above technical solution, the upper bearing is interference-pressed with the locking nut, and the end face of the inner ring and the outer ring of the upper bearing close to the screw nut is higher than the end face of the locking nut close to the screw nut.

[0015] According to an aspect of the above technical solution, the lower bearing is interference-pressed with the second accommodating portion away from the first accommodating portion, and the end face of the inner ring and the outer ring of the lower bearing close to the screw nut is lower than the boss end face of the second accommodating portion away from the first accommodating portion.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an embodiment of the electric circulating ball steering gear end limiting anti-suck-in structure cross-sectional schematic view.

[0018] Explanation of the symbols of the components in the drawings:

[0019] Input shaft 1, torsion bar 2, screw rod 3, lock nut 4, shell 5, first accommodating portion 51, second accommodating portion 52, upper bearing 6, upper bearing inner ring 61, upper bearing outer ring 62, screw rod nut 7, lower bearing 8, lower bearing outer ring 81, lower bearing inner ring 82. DETAILED DESCRIPTION

[0020] In order to make the purpose, characteristics and advantages of the utility model more apparent, obvious and easy to understand, the specific implementation of the utility model is described in detail below. The utility model is shown in several embodiments in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present. As used herein the terms "on" and "under" are used in their ordinary sense to mean that the item is present either directly or indirectly on or under the other item. As used herein, the term "vertical", "horizontal", "left", "right", "top", "bottom", and similar terms are used for explanation only and are not to be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, or be used in a particular orientation, unless the context of the present disclosure explicitly dictates or implies otherwise.

[0022] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] Please refer to Figure 1 , it is an electric circulating ball steering gear end limiting anti-suck structure schematic diagram provided in an embodiment of the utility model, the electric circulating ball steering gear end limiting anti-suck structure includes a shell 5, a steering assembly and a bearing assembly arranged in the shell 5, wherein:

[0024] In order to accommodate the steering assembly and the bearing assembly, the housing 5 includes a first accommodating portion 51 accommodating the steering assembly and a second accommodating portion 52 provided with the bearing assembly, and the first accommodating portion 51 and the second accommodating portion 52 are communicated. In order to avoid the phenomenon that the screw nut 7 is locked with the bearing, the upper and lower boss end faces of the second accommodating portion 52 are designed to be higher than the screw nut 7, so that when the screw nut 7 moves to the limit position, it can abut against the upper and lower boss end faces of the second accommodating portion 52, avoiding contact with the bearing.

[0025] Further, the steering assembly includes a torsion bar 2 arranged in the first accommodating portion 51, and an input shaft 1 and a screw rod 3 arranged at both ends of the torsion bar 2, respectively. The input shaft 1 drives the screw rod 3 to rotate in the second accommodating portion 52 through the torsion bar 2. The end of the screw rod 3 away from the input shaft 1 is arranged at the bottom of the second accommodating portion 52, and a threaded portion is arranged on part of the circumferential surface of the second accommodating portion 52, and a screw nut 7 is movably connected to the threaded portion. The screw nut moves along the length direction of the screw rod 3 in the threaded portion.

[0026] Further, the housing 5 is further provided with a plurality of locking nuts 4 arranged on both sides of the screw rod 3, so as to connect the first accommodating portion 51 and the second accommodating portion 52 as a whole.

[0027] The bearing assembly includes an upper bearing 6 arranged at one end of the second accommodating portion 52 close to the first accommodating portion 51, and a lower bearing 8 arranged at one end of the second accommodating portion 52 away from the first accommodating portion 51. The upper bearing 6 is interference-pressed with the locking nut 4, and the end face of the upper bearing inner ring 61 and the upper bearing outer ring 62 close to the screw nut 7 is higher than the end face of the locking nut 4 close to the screw nut 7. The lower bearing 8 is interference-pressed with the end of the second accommodating portion 52 away from the first accommodating portion 51, and the end face of the lower bearing inner ring 82 and the lower bearing outer ring 81 close to the screw nut 7 is lower than the boss end face of the second accommodating portion 52 away from the first accommodating portion 51.

[0028] In the present application, the upper and lower boss end faces of the second accommodating portion 52 are designed to be higher and thicker, so that the end face of the lower limit boss of the second accommodating portion 52 is higher than the end face of the lower bearing inner ring 82 and the lower bearing outer ring 81. When the locking nut 4 is assembled to the housing 5, the bottom thereof acts as the upper boss of the second accommodating portion 52, and the bottom end face of the locking nut 4 is lower than the end face of the upper bearing inner ring 61 and the upper bearing outer ring 62. Therefore, when the screw nut 7 moves up and down to the limit position, it will abut against the end faces of the upper and lower bosses first, thereby avoiding contact with the upper bearing 6 and the lower bearing 8, and the traditional structure "suction structure" cannot occur.

[0029] In summary, according to the electric circulating ball steering gear end limiting anti-suck-in structure, the end face of the bearing assembly is arranged to be lower than the upper and lower boss end faces of the second accommodating portion, so that the screw nut will be in contact with the upper and lower boss end faces of the second accommodating portion when moving to the upper and lower limit positions, avoiding locking with the bearing inner ring, and effectively solving the problem of suction. Specifically, the shell includes a first accommodating portion for providing the steering assembly, and a second accommodating portion for providing the bearing assembly; the bearing assembly is lower than the upper and lower boss end faces of the second accommodating portion; when the steering assembly moves in the first accommodating portion and the second accommodating portion, it is in contact with the upper and lower boss end faces of the second accommodating portion to avoid contact with the bearing inner ring.

[0030] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. An electric power circulating ball steering gear end position limiting anti-pulling structure, characterized in that, The electric circulating ball steering gear end position limiting anti-absorption structure comprises a shell, a steering assembly arranged in the shell, and a bearing assembly; The shell comprises a first accommodating portion for arranging the steering assembly, and a second accommodating portion for arranging the bearing assembly; The bearing assembly is lower than the upper and lower boss end faces of the second accommodating portion, and the steering assembly is in contact with the upper and lower boss end faces of the second accommodating portion when moving in the first accommodating portion and the second accommodating portion.

2. The electrically powered recirculating ball steering gear anti-latching structure of claim 1, wherein, The steering assembly comprises a torsion bar arranged in the first accommodating portion, and an input shaft and a screw rod arranged at two ends of the torsion bar, respectively.

3. The electrically powered recirculating ball steering gear anti-latching structure of claim 2, wherein, The input shaft drives the screw rod to rotate in the second accommodating portion through the torsion bar.

4. The electrically powered recirculating ball steering gear anti-latching structure of claim 1, wherein, The screw rod is provided with a threaded portion on a part of the circumferential surface of the second accommodating portion, and a screw rod nut is movably connected to the threaded portion.

5. The electrically powered recirculating ball steering gear anti-lash structure of claim 1, wherein, The shell is further provided with a plurality of locking nuts, and the plurality of locking nuts are arranged on both sides of the screw rod.

6. The electrically powered recirculating ball steering gear anti-lash structure of claim 5, wherein, The bearing assembly comprises an upper bearing arranged at one end of the second accommodating portion close to the first accommodating portion, and a lower bearing arranged at one end of the second accommodating portion away from the first accommodating portion.

7. The electrically powered recirculating ball steering gear anti-lash structure of claim 6, wherein, The upper bearing is interference press-fitted with the locking nut, and the end faces of the inner and outer rings of the upper bearing close to the screw rod nut are higher than the end face of the locking nut close to the screw rod nut. The lower bearing is interference press-fitted with the end of the second accommodating portion away from the first accommodating portion, and the end faces of the inner and outer rings of the lower bearing close to the screw rod nut are lower than the boss end face of the second accommodating portion away from the first accommodating portion.

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