A gear center pre-centering device for large internal gear ring inspection

Abstract

The present invention discloses a gear center pre-centering device for detecting large internal gear rings. The pre-centering device aims to solve the technical problems of low efficiency, high work intensity, and the risk of falling and injuring people in current gear ring precision detection and centering. The pre-centering device includes a fixed base, a vertical positioning rod fixedly mounted on the base, a connecting plate that can be fixed or rotated around the axis and slide up and down on the positioning rod can be loosely mounted on the positioning rod, a slide is fixedly mounted on the connecting plate, a slide is provided on the top of the slide, a slider is provided above the slide, and a sliding protrusion that matches the shape of the slide is provided on the bottom of the slider. The pre-centering device utilizes the tangent-tangent geometric relationship and, through the shape of the centering claw in the centering block, as well as the functions of the connecting assembly and the positioning assembly, achieves the safe, fast, accurate, and efficient placement of the large internal gear ring on the gear center rotary workbench, and ensures coaxial accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts processing and detection, and in particular relates to a gear center pre-centering device for detecting a large internal gear ring. Background Art

[0002] Ring gears are a common component in automobiles and related devices. They are a type of gear. Large internal ring gears generally refer to those with a diameter of more than 200 mm. They are heavy and require high gear precision.

[0003] At present, when testing the gear accuracy of a gear, it is necessary to first place the gear on a rotary table at the center of the gear and ensure a certain degree of coaxiality between the gear and the rotation center of the table. Only in this way can the gear accuracy be tested. That is, before testing the gear accuracy, the gear must be centered according to the gear center to ensure the coaxiality between the gear ring and the rotary table at the center of the gear, thereby completing the gear accuracy test.

[0004] Currently, there are two common methods for centering ring gears. One method involves placing the ring gear on a rotary table at the center of the gear and visually centering it. The ring gear's outer diameter runout is then measured with a dial indicator and manually moved until the outer diameter runout is ≤0.15mm. While this method can successfully center the ring gear, it is extremely inefficient, typically taking 2-3 minutes to center a single ring gear, making it unsuitable for large-scale use. Another method involves using a large-diameter three-jaw chuck with a centering hole. This chuck aligns with the outer diameter of the top shaft of the gear's rotary table, aligning the chuck at the table's rotational center. The ring gear is then placed on the chuck and rotated. The chuck then moves with the three jaws and clamps the gear, ensuring a coaxiality of ≤0.15mm relative to the table's rotational center. While this method also achieves ring gear centering, it requires frequent adjustments to the large-diameter chuck, which typically weighs over 15kg. This is labor-intensive and poses a risk of falling and injuring personnel. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a gear center pre-centering device for detecting large internal gear rings. The pre-centering device is intended to solve the technical problems of low efficiency, high operation intensity and risk of falling and injuring people in the current gear ring precision detection and centering. The pre-centering device utilizes the tangent-tangent geometric relationship, and through the shape of the centering claw head in the centering block, as well as the functions of the connecting assembly and the positioning assembly, it can safely, quickly, accurately and efficiently place the large internal gear ring on the gear center rotary workbench, and ensure coaxial accuracy.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the present invention provides a gear center pre-centering device for detecting a large internal gear ring, which comprises a fixed base, a vertical positioning rod fixedly installed on the base, a connecting plate which can be fixed or rotated around the axis and slide up and down on the positioning rod can be loosely installed on the positioning rod, a slide is fixedly installed on the connecting plate, a slide groove is provided on the top of the slide, a slider is provided above the slide, a sliding protrusion matching the shape of the slide groove is provided on the bottom of the slider, the sliding protrusion contacts and slides with the slide groove, and a connecting plate on one side of the slide is fixedly installed There is a first base, and a second base is fixedly installed on the connecting plate on the other side of the slide, and a connecting component that can be horizontally extended and retracted relative to the first base is installed on the first base, and the other end of the connecting component is connected to the slider, thereby driving the slider to slide horizontally on the slide, and a positioning component with adjustable horizontal position is installed on the second base for adjusting the limit of the slider, and a centering block is detachably installed on the other end of the slider connecting the connecting component, and the other end of the centering block is provided with centering claws symmetrically on the front and rear sides for pre-centering the inner gear ring, and the top inner sides of the two centering claws are both arc surfaces.

[0009] Among them, centering claws are axially symmetrically arranged on the front and rear sides of the centering block, and the inner sides of the tops of the two centering claws are arc surfaces, so that while ensuring a suitable center distance between the two centering claws (the center distance can be determined according to the difference in the outer diameter levels of different inner gear rings. Generally speaking, inner gear rings with small differences in outer diameter sizes can use the same centering block for pre-centering), the positional relationship of the center of the inner gear ring can be determined through the arc surfaces on the inner sides of the tops of the two centering claws and the tangent-tangent geometric relationship.

[0010] Preferably, the connecting component is a screw rod, and a screw rod is installed on the first base which can be rotated to achieve horizontal extension and retraction relative to the first base. The other end of the screw rod is connected to the slider, thereby driving the slider to slide horizontally on the slide. The circular rotation of the screw rod is converted into radial movement of the slider, which is easy to operate. This can maximize the stability of the slider's horizontal sliding on the slide and improve the accuracy of batch pre-centering.

[0011] Preferably, a sliding groove is provided transversely through the top of the slide seat, a slider is provided above the slide seat, and a sliding protrusion is provided at the bottom of the slider that matches the shape of the sliding groove and penetrates transversely, and the sliding protrusion contacts and slides with the sliding groove; this can improve the smoothness of the horizontal sliding of the slider on the slide seat and improve the practicality of the device.

[0012] Furthermore, the positioning assembly consists of a positioning bolt and a fixing nut, and a positioning bolt is installed on the second base, which can be rotated to adjust the horizontal position relative to the second base, and the positioning bolt is on the horizontal sliding trajectory of the sliding protrusion in the slider, so that the horizontal sliding of the slider is limited by the sliding protrusion, and a fixing nut for fixing the position of the positioning bolt is provided on the positioning bolt; this can improve the convenience of limiting the horizontal sliding of the slider and improve the efficiency of pre-centering of batch inner gear rings.

[0013] Preferably, the connecting plate can be loosely and tightly mounted on the positioning rod by means of an elastic clamp, and the elastic clamp is fastened by bolts, thereby enabling the connecting plate to be fixed or rotated around the axis and slid up and down on the positioning rod; the elastic clamp can be loosely and tightly mounted, and the direction can be flexibly adjusted, thereby improving the convenience of fixing the connecting plate or rotating around the axis and sliding up and down on the positioning rod, and the height position of the pre-centering device can be quickly adjusted according to different inner gear ring heights.

[0014] Preferably, the sliding groove of the sliding seat and the sliding protrusion of the slider are both dovetail-shaped, and the sliding groove and the sliding protrusion are in contact and sliding cooperation; by making the sliding groove and the sliding protrusion dovetail-shaped, the stability of the slider sliding horizontally on the sliding seat can be improved, and the accuracy of the device pre-centering can be ensured.

[0015] Preferably, the centering block is detachably mounted on one end of the slider via a detachable bayonet and a locking nut; this improves the convenience of disassembly and assembly of the centering block, and it can be quickly replaced by simply loosening the locking nut.

[0016] When the inner gear ring is centered by the pre-centering device of the present technical solution, it needs to be carried out in two steps. The first step is to pre-position the inner gear ring, and the second step is to continuously center the inner gear ring based on the positioning.

[0017] Among them, the general process of pre-positioning is: first install the pre-centering device on the platform of the gear center, and take the inner gear ring to be tested that has passed the inspection and has qualified the outer circle size and place it on the rotary workbench of the gear center, move the inner gear ring to be tested so that it is located at the rotation center of the gear center workbench, and use a dial indicator to confirm that its rotation diameter jump is ≤0.03mm; then, loosen the connecting plate so that it can rotate and slide up and down around the axial direction of the positioning rod, adjust the height and direction of the connecting plate, and adjust the horizontal extension distance of the connecting component to adjust the position of the slider, so that the top inner arc surface of the centering claws on the front and rear sides of the centering block simultaneously contacts the outer circle of the gear ring to be tested; then, by adjusting the horizontal position of the positioning component, the horizontal sliding of the slider is limited; finally, adjust the horizontal extension distance of the connecting component so that the slider drives the centering block to retreat a certain distance (≥0.1mm).

[0018] The general process of continuous pre-centering is as follows: first determine the centering block with a size suitable for the inner gear ring to be measured, and fix it on the slider; then, adjust the horizontal extension and contraction distance of the connecting component so that the front end of the connecting component pushes the slider and even the centering block forward until the slider contacts the positioning component and stops; then, place the inner gear ring to be measured on the rotary workbench in the center of the gear, and move its position so that the outer circle of the inner gear ring to be measured contacts the top inner arc surface of the centering claws on the front and rear sides of the centering block at the same time, at which time the centering of the inner gear ring to be measured is completed; finally, adjust the horizontal extension and contraction distance of the connecting component so that the slider drives the centering block to retreat a certain distance (≥0.1mm), so that the centering claws of the centering block are out of contact with the outer circle of the inner gear ring to be measured, and then the accuracy of the inner gear ring can be measured.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the present invention are: the pre-centering device of the present invention utilizes the tangent-tangent geometric relationship, and determines the positional relationship of the center of the inner gear ring through a centering block with an arc surface on the inner side of the top of the centering claw, making it very suitable for pre-centering of large inner gear rings of different diameters. At the same time, the height of the slider and the centering block is adjusted by the connecting plate, the horizontal position of the slider and the centering block is adjusted by the connecting component, and the slider and the centering block are precisely positioned by hard contact in combination with the positioning component to ensure the repeatability and consistency of the working position of the centering block, so that the inner gear ring can be pre-centered continuously and efficiently in batches, and the large inner gear ring can be placed on the gear center rotary workbench safely, quickly, accurately and efficiently, and the coaxial accuracy can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the drawings required for describing the specific implementation or the prior art will be briefly introduced below. Obviously, the drawings described below are only one implementation of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of pre-centering the inner ring gear according to a specific embodiment of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the principle of pre-centering of a centering block in a specific embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection structure between the centering block, the second base and the screw rod in a specific embodiment of the present invention;

[0025] Figure 4It is a schematic diagram of the connection structure of relevant components on the connecting plate in a specific embodiment of the present invention.

[0026] The marks in the accompanying drawings are: 1-base, 2-positioning rod, 3-connecting plate, 4-slide, 5-second base, 6-first base, 7-screw, 8-slider, 9-centering block, 901-centering claw, 10-positioning bolt, 11-fixing nut, 12-rotating worktable, 13-inner gear ring. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the technical solutions in the specific implementation methods of the present invention are clearly and completely described below to further illustrate the present invention. Obviously, the specific implementation methods described are only part of the implementation methods of the present invention, rather than all styles.

[0028] This specific embodiment is a device for detecting and pre-centering a large internal gear ring. Its specific structure is as follows: Figures 1-4 As shown, Figure 1 The schematic diagram of the structure for pre-centering the inner gear ring is shown. Figure 2 The principle structure diagram for pre-centering its centering block, Figure 3 This is a schematic diagram of the connection structure between the centering block, the second base and the screw rod. Figure 4 The cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, The cam is connected to the sliding seat and the sliding seat is fixed with a plurality of movable lids, and the movable lid is fixed with a plurality of movable lids at the rear end. The movable lid is fixed with a plurality of movable lids at the rear end.

[0029] Among them, the sliding groove of the sliding seat and the sliding protrusion of the slider are both dovetail-shaped, and the sliding groove and the sliding protrusion are in contact and sliding cooperation; the centering block is detachably installed at one end of the slider through a detachable bayonet and a locking nut.

[0030] When the inner gear ring is pre-centered by the pre-centering device of this embodiment, it needs to be carried out in two steps. The first step is to pre-position the inner gear ring, and the second step is to continuously pre-center the inner gear ring based on the positioning.

[0031] The general process of pre-positioning is as follows: first, the pre-centering device is installed on the platform of the gear center, and the inner gear ring to be tested that has passed the inspection of the outer circle size is placed on the rotary workbench of the gear center, and the inner gear ring to be tested is moved so that it is located at the rotation center of the gear center workbench, and the dial indicator is used to confirm that its rotation diameter jump is ≤0.03mm; then, the connecting plate is loosened by the bolt on the elastic collet so that it can rotate and slide up and down around the axial direction of the positioning rod, and the height and direction of the connecting plate are adjusted, and the horizontal extension distance of the screw rod is rotated to adjust the position of the slider so that the top inner arc surface of the centering claws on the front and rear sides of the centering block simultaneously contacts the outer circle of the gear ring to be tested; then, the current horizontal position of the sliding protrusion is supported by the positioning bolt, so that the horizontal sliding of the slider is limited by the sliding protrusion, and the positioning bolt is fixed in position by the fixing nut to limit the horizontal sliding of the slider; finally, the horizontal extension distance of the screw rod is rotated so that the slider drives the centering block to retreat a certain distance (≥0.1mm).

[0032] The general process of continuous pre-centering is as follows: first determine the centering block with a size suitable for the inner gear ring to be measured, and fix it on the slider; then, rotate the horizontal extension distance of the lead screw so that the front end of the lead screw pushes the slider and even the centering block forward until the slider contacts the positioning bolt and stops; then, place the inner gear ring to be measured on the rotary workbench in the center of the gear, and move its position so that the outer circle of the inner gear ring to be measured contacts the top inner arc surface of the centering claws on the front and rear sides of the centering block at the same time, at which time the centering of the inner gear ring to be measured is completed; finally, rotate the horizontal extension distance of the lead screw so that the slider drives the centering block to retreat a certain distance (≥0.1mm), so that the centering claws of the centering block are out of contact with the outer circle of the inner gear ring to be measured, and then the accuracy of the inner gear ring can be measured.

[0033] After the initial pre-centering, the subsequent pre-centering time for the same model of internal gear ring or different models of gear rings with the same outer diameter does not exceed 10 seconds, which is extremely efficient.

[0034] The above describes the main technical features and basic principles of the present invention and the related advantages. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the concept or essential characteristics of the present invention. Therefore, from all perspectives, the above-mentioned specific embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included within the present invention.

[0035] In addition, it should be understood that although this specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A gear center pre-centering device for large internal gear ring detection, characterized in that: The pre-centering device includes a fixed base, a vertical positioning rod is fixedly mounted on the base, a connecting plate that can be fixed or rotated around the axis and slide up and down on the positioning rod can be loosely mounted on the positioning rod, a slide is fixedly mounted on the connecting plate, a slide is provided on the top of the slide, a slider is provided above the slide, a sliding protrusion that matches the shape of the slide is provided at the bottom of the slider, and the sliding protrusion contacts and slides with the slide, a first base is fixedly mounted on the connecting plate on one side of the slide, and a second base is fixedly mounted on the connecting plate on the other side of the slide, a connecting assembly that can be horizontally extended relative to the first base is mounted on the first base, the other end of the connecting assembly is connected to the slider, thereby driving the slider to slide horizontally on the slide, a positioning assembly that can adjust the horizontal position for adjusting the slider is mounted on the second base, a centering block is detachably mounted on the other end of the slider connected to the connecting assembly, and the other end of the centering block is provided with centering claws that are symmetrical on the front and rear sides for pre-centering the inner gear ring, and the top inner sides of the two centering claws are both arc surfaces. A sliding groove is provided on the top of the sliding seat in a transversely penetrating manner, a slider is provided on the top of the sliding seat, and a sliding protrusion is provided on the bottom of the slider that matches the shape of the sliding groove and penetrates transversely, and the sliding protrusion contacts and slides with the sliding groove; The positioning assembly comprises a positioning bolt and a fixing nut. A positioning bolt is mounted on the second base so as to be rotatable so as to adjust the horizontal position relative to the second base. The positioning bolt is located on the horizontal sliding track of the sliding protrusion in the slider, so that the slider is limited in horizontal sliding by the sliding protrusion. A fixing nut is provided on the positioning bolt for fixing the positioning bolt in position. The cam is fixed to the base frame and is secured to the base with respect to the second end of the sliding member, and the cam is secured to the base frame with respect to the second end of the sliding member.

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