A method for measuring the angle between two tooth surfaces of a DP-EPS steering rack and a special measuring tool

Abstract

A method for measuring the angle between two tooth surfaces of a DP-EPS steering rack and a special measuring tool, wherein the invention method includes the following steps: axially positioning the rack; setting a plurality of positioning surfaces, which are respectively located on the vertices of a triangle or a polygon, and the positioning surfaces are all located in a first plane; making the positioning surfaces contact and fit with the tooth surface at one end of the rack; setting a plurality of displacement sensors or distance sensors, which are respectively located on the vertices of a triangle or a polygon, setting a zero point for the displacement sensor or the distance sensor, and the zero point is all located in a second plane; measuring the tooth surface at the other end of the rack by the displacement sensor or the distance sensor; determining a third plane according to the data of the displacement sensor or the distance sensor; and calculating the deviation between the third plane and the second plane. The measurement process is scientific and reasonable, and the multiple positioning surfaces and sensors ensure the accuracy of the measurement results of the present invention.

Description

Technical Field

[0001] The invention relates to the manufacture and detection of automobile steering gears, and in particular to a method for measuring the angle between two tooth surfaces of a DP-EPS steering rack and a special measuring tool. Background Art

[0002] The models equipped with DP-EPS steering gear are generally mid-to-high-end passenger cars, and the accuracy of the steering rack, the core component of the DP-EPS steering gear, directly affects the performance of the DP-EPS steering gear. During the manufacturing process, it is particularly important to ensure the accuracy of the angle between the two tooth surfaces of the DP-EPS steering rack. Summary of the invention

[0003] In response to the needs in the prior art, the present invention provides a method for measuring the angle between two tooth surfaces of a DP-EPS steering rack and a special measuring tool.

[0004] A method for measuring the angle between two tooth surfaces of a DP-EPS steering rack comprises the following steps:

[0005] Step 1: Axially positioning the rack;

[0006] Step 2: setting a plurality of positioning surfaces, wherein the positioning surfaces are respectively located on the vertices of the triangle or polygon in a one-to-one correspondence, and the positioning surfaces are all located in the first plane;

[0007] Step 3: The positioning surfaces are brought into contact with and fit with the tooth surfaces at one end of the rack, thereby positioning the tooth surfaces at one end of the rack;

[0008] Step 4: setting a plurality of displacement sensors or ranging sensors, wherein the displacement sensors or ranging sensors are respectively located at the vertices of a triangle or a polygon in one-to-one correspondence, setting zero points for the displacement sensors or ranging sensors, wherein the zero points are all located in the second plane, and setting the angle between the second plane and the first plane as the standard angle between the two tooth surfaces of the rack;

[0009] Step 5: Measuring the tooth surface at the other end of the rack by means of the displacement sensor or the distance sensor to obtain data of the displacement sensor or the distance sensor;

[0010] Step 6: Determine the third plane according to the data of the displacement sensor or the distance sensor;

[0011] Step 7: Calculate the deviation between the third plane and the second plane.

[0012] Further: In step 2, the positioning surface is located at the vertex of a right triangle or a rectangle, so as to facilitate cooperation with the tooth surface on the rack.

[0013] Further: in step 3, the displacement sensor or the distance measuring sensor is located at the vertices of two rectangles, and the side edges of one side of the two rectangles are overlapped.

[0014] Further: In step 1, V-grooves with an opening facing upward are provided at positions corresponding to the end portions of the rack, the V-grooves are supported on the rack and the rack is pre-positioned; and tips are provided at positions corresponding to the end faces of the rack, the tips are abutted against the axial position of the end faces of the rack to ensure that the axis of the tip is coaxial with the rack, thereby axially positioning the rack.

[0015] A special measuring tool for the angle between two tooth surfaces of a DP-EPS steering rack, comprising a workbench and a fixed top and a movable top arranged coaxially and facing each other, wherein the fixed top is fixedly connected to the workbench, and the movable top is arranged on the workbench movably along its axial direction; a positioning mechanism and a measuring mechanism are arranged on the workbench between the fixed top and the movable top, wherein the positioning mechanism is located near the movable top, the positioning mechanism comprises a positioning table, and a plurality of positioning surfaces are arranged on the positioning table, wherein the positioning surfaces are respectively located on the vertices of a triangle or a polygon in a one-to-one correspondence, and the positioning surfaces are all located in a first plane; the measuring mechanism is located near the fixed top, and the measuring mechanism comprises a plurality of displacement sensors or distance sensors, wherein the displacement sensors or distance sensors are respectively located on the vertices of a triangle or a polygon in a one-to-one correspondence, and the displacement sensors or distance sensors are all provided with zero points, wherein the zero points are all located in a second plane, and the angle between the second plane and the first plane is the standard angle between the two tooth surfaces of the rack. The fixed top and the movable top both comprise a rod body provided with a conical end.

[0016] Further: a support plate is fixedly arranged on the workbench between the fixed top and the movable top and close to the fixed top and the movable top respectively, and a V-shaped groove opening upward is arranged on the top of the support plate, and the center line of the V-shaped groove is arranged vertically and intersecting with the axis of the fixed top and the movable top, so as to pre-position the axial direction of racks of different specifications.

[0017] Further: the positioning platform is lifted and lowered on a mounting seat, and the mounting seat is movably arranged along the axial direction of the movable top.

[0018] Further: the positioning platform is in the shape of a long strip, and first positioning surfaces are provided on both sides of the ends of the positioning platform surface, and the first positioning surfaces are both located in the sixth plane; a strip-shaped replacement platform is detachably installed in the middle of the positioning platform, and the replacement platform is protrudingly arranged on the surface of the positioning platform, and second positioning surfaces are provided on both sides of the ends of the replacement platform surface, and the second positioning surfaces are both located in the seventh plane, and the sixth positioning surface is arranged in parallel with the seventh plane. After the replacement platform is installed on the positioning platform, the rack with a shorter tooth surface length can be positioned.

[0019] Further: comprising two positioning platforms facing each other and arranged correspondingly up and down.

[0020] Further: the displacement sensor or the ranging sensor is fixedly installed on a fixed seat, the fixed seat is arranged on a connecting plate along the axial movement of the fixed top, and the connecting plate is arranged on the workbench for lifting; the connecting plate is arranged on a column for lifting, and the column is arranged on the workbench for moving along the direction perpendicular to the axial direction of the fixed top.

[0021] The beneficial effects of the present invention are as follows: a plurality of small positioning surfaces are used to contact and fit the tooth top surface at one end of the rack, a positioning reference surface is set, a plurality of sensors are used to measure the tooth top surface at the other end of the rack, and the sensors are calibrated with standard parts before measurement, so as to measure whether the angle between the two tooth top surfaces of the rack meets the production standards. The measurement process is scientific and reasonable, and a plurality of positioning surfaces and sensors ensure the accuracy of the measurement results of the angle between the two tooth surfaces of the rack of the present invention. The present invention has a simple structure, is easy to operate, and is suitable for measuring racks of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the rack measurement state of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the special measuring tool in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the positioning platform in the present invention.

[0025] In the figure, 1, workbench; 21, fixed center; 22, movable center; 3, support plate; 4, positioning mechanism; 41, positioning table; 42, lifting plate; 43, mounting seat; 44, positioning surface; 45, replacement table; 451, second positioning surface; 5, measuring mechanism; 51, displacement sensor or distance sensor; 52, fixed seat; 53, connecting plate; 54, column; 6, rack. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the accompanying drawings. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. The directional terms such as left, middle, right, top, and bottom in the examples of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0027] A method for measuring the angle between the two tooth surfaces of a DP-EPS steering rack, such as Figure 1 , Figure 2 and 3 As shown, the following steps are included:

[0028] Step 1: Axially positioning the rack 6 by means of a fixed top 21 and a movable top 22 which are coaxially and oppositely arranged;

[0029] Step 2: A plurality of positioning surfaces 44 are provided in the positioning mechanism 4, and the positioning surfaces 44 are respectively located on the vertices of a triangle or a polygon in a one-to-one correspondence, and the positioning surfaces are all located in the first plane;

[0030] Step 3: The positioning surfaces 44 are brought into contact with and fit with the tooth surface at one end of the rack 6, thereby positioning the tooth surface at one end of the rack 6;

[0031] Step 4: a plurality of displacement sensors or distance sensors 51 are arranged in the measuring mechanism 5, and the displacement sensors or distance sensors 51 are respectively arranged at the vertices of the triangle or polygon in a one-to-one correspondence, and zero points are set for the displacement sensors or distance sensors 51, and the zero points are all arranged in the second plane, and the angle between the second plane and the first plane is set as the standard angle between the two tooth surfaces of the rack 6;

[0032] Step 5: Measuring the tooth surface at the other end of the rack 6 by means of the displacement sensor or the distance sensor 51 to obtain data of the displacement sensor or the distance sensor 51;

[0033] Step 6: Determine the third plane according to the data of the displacement sensor or the distance sensor 51;

[0034] Step 7: Calculate the deviation between the third plane and the second plane.

[0035] Wherein, in step 2, the positioning surface is located at the vertex of a right triangle or a rectangle, so as to facilitate cooperation with the tooth surface on the rack. In step 3, the displacement sensor or the distance measuring sensor is located at the vertices of two rectangles, and the side edges of the two rectangles are arranged to overlap. In step 1, V-shaped grooves with an upward opening are provided at positions corresponding to the ends of the rack, and the V-shaped grooves are supported on the rack and the rack is pre-positioned; and tips, namely the fixed tip and the movable tip, are provided at positions corresponding to the end faces of the rack, and the tips are abutted against the axial center position of the end faces of the rack to axially position the rack.

[0036] A special measuring tool for the angle between the two tooth surfaces of a DP-EPS steering rack, such as Figure 2 and Figure 3 As shown, it includes a workbench 1 and a fixed top 21 and a movable top 22 that are coaxially and oppositely arranged, the fixed top 21 is fixedly connected to the workbench 1, and the movable top 22 is movably arranged on the workbench 1 along its axial direction; a positioning mechanism 4 and a measuring mechanism 5 are provided at a position between the fixed top 21 and the movable top 22 on the workbench 1, the positioning mechanism 4 is located near the movable top 22, the positioning mechanism 4 includes a positioning platform 41, and a plurality of positioning surfaces 44 are provided on the positioning platform 41, the positioning surfaces 44 are respectively located at the vertices of a triangle or a polygon in a one-to-one correspondence, and the positioning surfaces 44 are all located in a first plane; the measuring mechanism 5 is located near the fixed top 21, the measuring mechanism 5 includes a plurality of displacement sensors or distance sensors 51, the displacement sensors or distance sensors 51 are respectively located at the vertices of a triangle or a polygon in a one-to-one correspondence, the displacement sensors or distance sensors 51 are all provided with zero points, and the zero points are all located in a second plane, and the angle between the second plane and the first plane is the standard angle between the two tooth surfaces of the rack. The fixed top and the movable top both include a rod body with a conical end.

[0037] A support plate 3 is fixedly provided on the workbench 1 between the fixed center 22 and the movable center 22 and close to the fixed center and the movable center respectively. A V-shaped groove opening upward is provided on the top of the support plate 3. The center line of the V-shaped groove is vertically arranged and crosses the axis of the fixed center and the movable center.

[0038] The positioning platform 41 is lifted and lowered on the mounting seat 43 by means of a lifting plate 42 and a telescopic cylinder, and the mounting seat 43 is arranged to move along the axial direction of the movable top 22. The positioning platform 41 is in the shape of a long strip, and first positioning surfaces are arranged on both sides of the two ends of the surface of the positioning platform 41, and the first positioning surfaces are located in the same plane, which is recorded as the sixth plane; a strip-shaped replacement platform is detachably installed in the middle of the positioning platform 41, and the replacement platform is protrudingly arranged on the surface of the positioning platform, and second positioning surfaces are arranged on both sides of the two ends of the surface of the replacement platform, and the second positioning surfaces are located in another plane, which is recorded as the seventh plane, and the sixth positioning surface and the seventh plane are arranged in parallel, as shown in FIG. Figure 3 The seventh plane is higher than the sixth plane. After the replacement platform is installed on the positioning platform 41, the rack with a shorter tooth surface length can be positioned. The positioning platform 41 includes two positioning platforms 41 facing each other and correspondingly arranged up and down.

[0039] The displacement sensor or distance sensor 51 is fixedly mounted on a fixed seat 52, and the fixed seat 52 is arranged on a connecting plate 53 for axial movement along the fixed top, and the connecting plate 53 is arranged for lifting and lowering on the workbench 1; the connecting plate 53 is arranged for lifting and lowering on a column 54, and the column 54 is arranged on the workbench 1 for movement along the direction perpendicular to the axial direction of the fixed top 21.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. 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, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for measuring the angle between two tooth surfaces of a DP-EPS steering rack, characterized in that: The following steps are involved: Step 1: Axially positioning the rack; Step 2: setting a plurality of positioning surfaces, wherein the positioning surfaces are respectively located on the vertices of the triangle or polygon in a one-to-one correspondence, and the positioning surfaces are all located in the first plane; Step 3: The positioning surfaces are brought into contact with and fit with the tooth surfaces at one end of the rack, thereby positioning the tooth surfaces at one end of the rack; Step 4: setting a plurality of displacement sensors or ranging sensors, wherein the displacement sensors or ranging sensors are respectively located at the vertices of a triangle or a polygon in one-to-one correspondence, setting zero points for the displacement sensors or ranging sensors, wherein the zero points are all located in the second plane, and setting the angle between the second plane and the first plane as the standard angle between the two tooth surfaces of the rack; Step 5: Measuring the tooth surface at the other end of the rack by means of the displacement sensor or the distance sensor to obtain data of the displacement sensor or the distance sensor; Step 6: Determine the third plane according to the data of the displacement sensor or the distance sensor; Step 7: Calculate the deviation between the third plane and the second plane.

2. The method for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 1, characterized in that: In step 2, the positioning surface is located at the vertex of a right triangle or a rectangle.

3. The method for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 1, characterized in that: In step 3, the displacement sensor or the distance measuring sensor is located at the vertices of two rectangles, and the side edges of one side of the two rectangles are overlapped.

4. The method for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 1, characterized in that: In step 1, V-shaped grooves opening upward are provided at positions corresponding to the end portions of the rack, the V-shaped grooves are supported on the rack and the rack is pre-positioned; and tips are provided at positions corresponding to the end faces of the rack, the tips are abutted against the axial center position of the end faces of the rack to axially position the rack.

5. A special measuring tool for the angle between the two tooth surfaces of a DP-EPS steering rack, characterized by: It includes a workbench and a fixed top and a movable top that are coaxially and oppositely arranged, the fixed top is fixedly connected to the workbench, and the movable top is movably arranged on the workbench along its axial direction; a positioning mechanism and a measuring mechanism are provided on the workbench at a position between the fixed top and the movable top, the positioning mechanism is located near the movable top, the positioning mechanism includes a positioning table, and a plurality of positioning surfaces are provided on the positioning table, the positioning surfaces are respectively and one-to-one located at the vertices of a triangle or a polygon, and the positioning surfaces are all located in a first plane; the measuring mechanism is located near the fixed top, the measuring mechanism includes a plurality of displacement sensors or distance measuring sensors, the displacement sensors or distance measuring sensors are respectively and one-to-one located at the vertices of a triangle or a polygon, the displacement sensors or distance measuring sensors are both provided with a zero point, the zero point is all located in a second plane, and the angle between the second plane and the first plane is the standard angle between the two tooth surfaces of the rack.

6. A special measuring tool for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 5, characterized in that: A support plate is fixedly provided on the workbench between the fixed center and the movable center and close to the fixed center and the movable center respectively, and a V-shaped groove opening upward is provided on the top of the support plate, and the center line of the V-shaped groove is vertically arranged and intersected with the axis of the fixed center and the movable center.

7. A special measuring tool for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 5, characterized in that: The positioning platform is lifted and lowered on a mounting seat, and the mounting seat is movably arranged along the axial direction of the movable top.

8. The special measuring tool for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 5, characterized in that: The positioning table is in the shape of a long strip, and first positioning surfaces are provided on both sides of the end portions of the table surface of the positioning table, and the first positioning surfaces are both located in the sixth plane; a strip-shaped replacement table is detachably installed in the middle of the positioning table, and the replacement table is protrudingly arranged on the table surface of the positioning table, and second positioning surfaces are provided on both sides of the end portions of the table surface of the replacement table, and the second positioning surfaces are both located in the seventh plane, and the sixth plane and the seventh plane are arranged in parallel.

9. A special measuring tool for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to any one of claims 5 to 8, characterized in that: It comprises two positioning platforms arranged opposite to each other.

10. A special measuring tool for measuring the angle between two tooth surfaces of a DP-EPS steering rack according to claim 5, characterized in that: The displacement sensor or the distance measuring sensor is fixedly mounted on a fixed seat, the fixed seat is arranged on a connecting plate for axial movement along the fixed top, and the connecting plate is arranged on the workbench for lifting; the connecting plate is arranged on a column for lifting, and the column is arranged on the workbench for movement along a direction perpendicular to the axial direction of the fixed top.

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