Rotating shaft fixing structure and vehicle body height sensor

Abstract

The utility model relates to a rotating shaft fixing structure and a vehicle body height sensor. The rotating shaft fixing structure comprises a shell, an upper bearing, an inner clamp spring, a lower bearing and a rotating shaft, the shell is provided with an upper stepped hole and a lower stepped hole which are communicated with each other, and a first circular clamping groove is formed in the inner side wall of the upper stepped hole; the upper bearing is mounted at the bottom of the upper stepped hole and is in interference fit with the inner side wall of the upper stepped hole; the inner clamping spring is clamped in the first circular clamping groove, and the bottom of the inner clamping spring abuts against the upper bearing; the lower bearing is mounted at the top of the lower stepped hole and is in interference fit with the inner side wall of the lower stepped hole; a rotating shaft is arranged in the upper bearing and the lower bearing in a penetrating manner; a second circular clamping groove is formed in the outer surface of the rotating shaft and is positioned below the lower bearing; the outer clamping spring is clamped in the second circular clamping groove, and the top of the outer clamping spring abuts against the lower bearing. And through the design of the inner snap spring and the outer snap spring, the rotating stability of the rotating shaft can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle height sensor, especially relates to a rotating shaft fixing structure and vehicle height sensor. BACKGROUND

[0002] The vehicle height sensor is a component commonly used for measuring the posture change of the front and rear suspensions of a vehicle, which generally comprises a shell, a swing arm, a rotating shaft, a magnet steel and a Hall element, the up and down movement of the suspension is converted into the rotating movement of the magnet steel by the swing arm through the rotating shaft, so that the magnetic field is changed, and the Hall chip is used to detect the change of the magnetic field to calculate the vehicle height and convert it into an electrical signal output.

[0003] At present, the rotating shaft of the vehicle height sensor is usually simply fixed in the shell through a bearing, and the rotating shaft and the bearing are prone to shift during the use of the vehicle height sensor, which leads to unstable rotation of the rotating shaft and further leads to the change of the relative position of the magnet steel and the Hall element, thereby affecting the detection result. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a rotating shaft fixing structure and vehicle height sensor, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the utility model is implemented by the following technical solutions:

[0006] A rotating shaft fixing structure comprises

[0007] A shell has an upper stepped hole and a lower stepped hole in communication with each other, a first circular clamping groove is formed in the inner side wall of the upper stepped hole;

[0008] An upper bearing is installed at the bottom of the upper stepped hole and is in interference fit with the inner side wall of the upper stepped hole;

[0009] An inner clamping spring is clamped in the first circular clamping groove and abuts against the upper bearing at the bottom;

[0010] A lower bearing is installed at the top of the lower stepped hole and is in interference fit with the inner side wall of the lower stepped hole;

[0011] A rotating shaft is arranged in the upper bearing and the lower bearing, and a second circular clamping groove is formed in the outer surface of the rotating shaft below the lower bearing;

[0012] An outer clamping spring is clamped in the second circular clamping groove and abuts against the lower bearing at the top.

[0013] Preferably, the upper bearing is in interference fit with the rotating shaft, and the lower bearing is in clearance fit with the rotating shaft.

[0014] A vehicle body height sensor comprises the rotating shaft fixing structure of any one of the above, and further comprises

[0015] A swing arm is fixedly connected to the top of the rotating shaft.

[0016] A magnetic steel holder is sleeved on the bottom of the rotating shaft.

[0017] A magnetic steel is fixed in the magnetic steel holder.

[0018] An end cover is fixedly connected to the bottom of the shell by screws.

[0019] A Hall element is fixed on the top of the end cover and directly below the magnetic steel.

[0020] Preferably, the magnetic steel is plastic-coated in the magnetic steel holder.

[0021] A third circular clamping groove is formed on the outer surface of the bottom of the rotating shaft, and anti-rotation grooves are formed on both sides of the third circular clamping groove and extend to the bottom surface of the rotating shaft.

[0022] The inner side wall of the magnetic steel holder extends two anti-rotation blocks for clamping into the anti-rotation grooves, and the inner side wall of the magnetic steel holder extends an anti-falling block at the top for clamping into the third circular clamping groove.

[0023] Preferably, the contact surface of the magnetic steel holder and the rotating shaft is provided with instant adhesive.

[0024] Preferably, a sealing groove is formed on the top surface of the end cover, and a sealing ring is placed in the sealing groove.

[0025] The rotating shaft fixing structure and the vehicle body height sensor have the following beneficial effects:

[0026] 1. The upper and lower stepped hole structures facilitate the installation of the upper bearing and the lower bearing. After the upper bearing is installed in place, the upper stepped hole itself limits the bottom of the upper bearing, while the inner clamping spring is clamped in the first circular clamping groove, the bottom abuts against the upper bearing, and the top of the upper bearing is limited by the inner clamping spring, which effectively prevents the axial movement of the upper bearing. After the lower bearing is installed in place, the lower stepped hole itself limits the top of the lower bearing, while the outer clamping spring is clamped in the second circular clamping groove, the top abuts against the lower bearing, and the bottom of the lower bearing is limited by the outer clamping spring, which effectively prevents the axial movement of the lower bearing. Therefore, the design of the inner clamping spring and the outer clamping spring can ensure the stability of the rotating shaft during rotation.

[0027] 2, the cooperation of the anti-rotation block and the anti-rotation groove, the effect of anti-rotation is achieved, the anti-loose block and the third circular clamping groove are matched, the effect of anti-loose is achieved, the stable connection of the rotating shaft and the magnet steel holder is guaranteed, through the design of the above structure, the relative position stability of the magnet steel and the rotating shaft after assembly can be guaranteed without error, and the stability of the whole product is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a structural schematic view of the vehicle body height sensor of the utility model;

[0029] Fig. 2 It is a connection schematic view of the rotating shaft and the magnet steel holder of the utility model.

[0030] In the figure: 1, shell; 101, upper stepped hole; 102, lower stepped hole; 103, first circular clamping groove; 2, upper bearing; 3, inner clamping spring; 4, lower bearing; 5, rotating shaft; 51, second circular clamping groove; 52, third circular clamping groove; 53, anti-rotation groove; 6, outer clamping spring; 7, swing arm; 8, magnet steel holder; 81, anti-rotation block; 82, anti-loose block; 9, magnet steel; 10, end cover; 11, hall element; 12, sealing ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be clearly and completely described below in combination with the drawings of the utility model.

[0032] The technical scheme of the utility model will be clearly and completely described below in combination with embodiments, and obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0033] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0035] Embodiment

[0036] Reference Figs. 1-2 A rotating shaft fixing structure, comprising

[0037] A housing 1 has an upper stepped hole 101 and a lower stepped hole 102 in communication with each other, and a first circular clamping groove 103 is formed in the inner side wall of the upper stepped hole 101.

[0038] An upper bearing 2 is installed at the bottom of the upper stepped hole 101 and is in interference fit with the inner side wall of the upper stepped hole 101.

[0039] An inner clamping spring 3 is clamped in the first circular clamping groove 103 and abuts against the upper bearing 2 at the bottom.

[0040] A lower bearing 4 is installed at the top of the lower stepped hole 102 and is in interference fit with the inner side wall of the lower stepped hole 102.

[0041] A rotating shaft 5 is arranged in the upper bearing 2 and the lower bearing 4, and a second circular clamping groove 51 is formed in the outer surface of the rotating shaft 5 below the lower bearing 4.

[0042] An outer clamping spring 6 is clamped in the second circular clamping groove 51 and abuts against the lower bearing 4 at the top.

[0043] The upper stepped hole 101 and the lower stepped hole 102 structure are convenient for mounting the upper bearing 2 and the lower bearing 4, after the upper bearing 2 is mounted in place, the upper stepped hole 101 limits the bottom of the upper bearing 2, and the inner snap spring 3 is clamped in the first circular clamping groove 103, the bottom abuts against the upper bearing 2, the top of the upper bearing 2 can be limited by the inner snap spring 3, so that the axial movement of the upper bearing 2 can be effectively prevented; after the lower bearing 4 is mounted in place, the lower stepped hole 102 limits the top of the lower bearing 4, and the outer snap spring 6 is clamped in the second circular clamping groove 51, the top abuts against the lower bearing 4, the bottom of the lower bearing 4 can be limited by the outer snap spring 6, so that the axial movement of the lower bearing 4 can be effectively prevented, therefore, the stability of the rotating shaft 5 during rotation can be ensured through the design of the inner snap spring 3 and the outer snap spring 6, and meanwhile, the abutment of the top of the outer snap spring 6 against the lower bearing 4 can also play a role in preventing the rotating shaft 5 from being pulled out when the rotating shaft 5 is subjected to external pulling force.

[0044] In one specific embodiment, the upper bearing 2 is in interference fit with the rotating shaft 5, and the lower bearing 4 is in clearance fit with the rotating shaft 5.

[0045] The installation positions of the upper bearing 2 and the lower bearing 4 may be different in axis due to machining errors, and the clearance fit between the lower bearing 4 and the rotating shaft 5 can absorb the machining errors, thereby further ensuring the stability of the rotating shaft 5 during rotation.

[0046] The utility model discloses still provide a kind of vehicle body height sensor, including the rotating shaft 5 fixed structure of above, still include swing arm 7, with the top fixed connection of rotating shaft 5;

[0047] Magnetic steel retainer 8, is set in the bottom of rotating shaft 5;

[0048] Magnetic steel 9, is fixed in the magnetic steel retainer 8;

[0049] End cover 10, is fixedly connected with the bottom of shell 1 by screw;

[0050] Hall element 11, is fixed in the top of end cover 10, is located just below magnetic steel 9.

[0051] Hall element 11 includes PCB board and the Hall chip mounted on PCB board, and PCB board is riveted with the positioning pin of end cover 10 by the positioning hole of itself, guarantees the positional accuracy and firmness of PCB board and end cover 10.

[0052] The vehicle body height sensor is used, swing arm 7 is connected with suspension, when suspension moves, rotating shaft 5 is rotated by swing arm 7, in turn drives magnetic steel retainer 8 and magnetic steel 9 to rotate, changes magnetic field, and Hall element 11 calculates vehicle height according to the change of magnetic field, and it is converted into electric signal output.

[0053] In one specific embodiment, the magnetic steel 9 is plastic-wrapped in the magnetic steel holder 8, so that the magnetic steel holder 8 and the magnetic steel 9 are integrated, which is conducive to ensuring the accuracy of the position of the magnetic steel 9 on the magnetic steel holder 8, and the plastic wrapping layer can effectively protect the magnetic steel 9 from corrosion and mechanical damage by the external environment, and in addition, the plastic-wrapping technology can also facilitate the manufacture of a complex-shaped magnetic steel holder 8 structure;

[0054] The bottom outer surface of the rotating shaft 5 is provided with a third circular clamping groove 52, and the two sides of the third circular clamping groove 52 are provided with anti-rotation grooves 53 extending to the bottom surface of the rotating shaft 5.

[0055] The inner side wall of the magnetic steel holder 8 extends two anti-rotation blocks 81 for clamping into the anti-rotation grooves 53, and the inner side wall of the magnetic steel holder 8 extends an anti-falling block 82 at the top for clamping into the third circular clamping groove 52.

[0056] When the magnetic steel holder 8 is connected with the rotating shaft 5, the anti-rotation blocks 81 are inserted into the anti-rotation grooves 53 and moved upward along the anti-rotation grooves 53 until the anti-falling block 82 is clamped into the third circular clamping groove 52, the cooperation of the anti-rotation blocks 81 and the anti-rotation grooves 53 achieves the effect of anti-rotation, so that the rotating shaft 5 and the magnetic steel holder 8 always keep synchronous rotation, the cooperation of the anti-falling block and the third circular clamping groove 52 achieves the effect of anti-loosening, so as to ensure the stable connection of the rotating shaft 5 and the magnetic steel holder 8, and through the above structure design, the relative position between the magnetic steel 9 and the rotating shaft 5 after assembly can be ensured to be stable and not to produce errors, so as to ensure the stability of the whole product.

[0057] In one specific embodiment, the contact surface between the magnetic steel holder 8 and the rotating shaft 5 is provided with instant adhesive, which is used to improve the firmness of the connection between the magnetic steel holder 8 and the rotating shaft 5.

[0058] In one specific embodiment, the top surface of the end cover 10 is provided with a sealing groove, and a sealing ring 12 is placed in the sealing groove, which seals the contact surface between the end cover 10 and the shell 1 through the sealing ring 12.

[0059] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotating shaft fixing structure, characterized in that: include The housing has an upper stepped hole and a lower stepped hole that are connected to each other, and the inner side wall of the upper stepped hole is provided with a first circular groove; the upper bearing is installed at the bottom of the upper stepped hole and has an interference fit with the inner side wall of the upper stepped hole; An inner retaining spring, which is clamped in the first circular retaining groove and has a bottom portion abutting against the upper bearing; a lower bearing, mounted on the top of the lower stepped hole and having an interference fit with the inner side wall of the lower stepped hole; A rotating shaft is inserted into the upper bearing and the lower bearing, and a second circular groove is formed on the outer surface of the rotating shaft below the lower bearing; The outer retaining ring is clamped in the second circular retaining groove, and the top thereof abuts against the lower bearing.

2. The rotating shaft fixing structure according to claim 1, characterized in that: The upper bearing is interference-fitted with the rotating shaft, and the lower bearing is clearance-fitted with the rotating shaft.

3. A vehicle height sensor, comprising the rotating shaft fixing structure according to any one of claims 1 to 2, characterized in that: Also includes a swing arm, fixedly connected to the top of the rotating shaft; A magnetic steel retainer is sleeved on the bottom of the rotating shaft; A magnetic steel, fixed in the magnetic steel holder; an end cover fixedly connected to the bottom of the housing by screws; The Hall element is fixed on the top of the end cover and is located directly below the magnetic steel.

4. The vehicle height sensor according to claim 3, characterized in that: The magnetic steel is plastic-coated in the magnetic steel retainer; A third circular slot is formed on the outer surface of the bottom of the rotating shaft, and anti-rotation slots extending to the bottom surface of the rotating shaft are formed on both sides of the third circular slot; The inner side wall of the magnetic steel holder is extended with two anti-rotation blocks for being clamped into the anti-rotation groove, and the top of the inner side wall of the magnetic steel holder is extended with an anti-slip block for being clamped into the third circular clamping groove.

5. The vehicle height sensor according to claim 3, characterized in that: The contact surface between the magnetic steel retainer and the rotating shaft is provided with instant adhesive.

6. The vehicle height sensor according to claim 3, characterized in that: A sealing groove is provided on the top surface of the end cover, and a sealing ring is placed in the sealing groove.

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