EMB ball screw cambered surface groove detection device

Abstract

The utility model discloses an EMB ball screw cambered surface groove detection device which comprises a base, the base is connected with a stand column, the stand column is connected with a mounting seat, and the mounting seat can rotate around the axis of the stand column. The mounting seat is connected with a meter type measuring tool, so that the meter type measuring tool is in a vertical posture with a downward meter hand; a to-be-tested lead screw is placed on the base in a vertical posture and located on one side of the stand column. Comprising a standard part and an end hole used for being placed in a measured lead screw, the bottom of the end hole is provided with a cambered surface groove, and the bottom of the standard part is in contact with the cambered surface groove; according to the utility model, rapid and accurate full detection of each EMB ball screw product is realized, the requirements of high-precision and high-frequency detection are met, and the detection efficiency is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of ball screw testing technology, specifically to an EMB ball screw arc groove testing device. Background Technology

[0002] With increasingly stringent global environmental regulations, the automotive industry is undergoing unprecedented transformation, accelerating its shift towards electrification and autonomous driving. In this transformation, the Electric Braking System (EMB), as a key technology, significantly improves cornering performance and fuel efficiency due to its ability to achieve high-precision control and support independent control of braking force for each tire. The ball screw in the EMB system, as a crucial component for achieving precise transmission, plays a vital role in converting rotational force into linear force due to its advantages of high transmission efficiency, long service life, and high working accuracy.

[0003] However, due to the unique structure of automotive EMB ball screws, especially the curved surface design below the inner bore, traditional measuring tools cannot directly measure it. Currently, the industry commonly uses coordinate measuring machines (CMMs) for point-finding inspection to assess the depth of the ball screw's curved surface. However, this method has significant limitations: First, CMMs have low inspection efficiency and cannot meet the high-frequency inspection needs of production lines, allowing only sampling rather than full inspection; second, since the depth of the ball screw's curved surface is a key characteristic dimension of EMB ball screws, it requires extremely high precision and has a narrow tolerance range, thus requiring the inspection equipment to also possess extremely high precision, which CMMs do not perform ideally. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the prior art by providing an EMB ball screw arc groove inspection device. By employing a mounting base that can rotate around a column, combined with dial gauges, and utilizing standard parts as an indirect measurement method, it achieves rapid and accurate full inspection of each EMB ball screw product, meeting the requirements of high-precision and high-frequency testing, and significantly improving testing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An EMB ball screw arc groove testing device includes a base, a column connected to the base, a mounting base connected to the column, and the mounting base being rotatable around the axis of the column; a dial gauge connected to the mounting base, positioning the dial gauge in a vertical position with the needle pointing downwards; the ball screw to be tested is placed vertically on the base, located on one side of the column; a standard part is included for placement in the end hole of the ball screw to be tested, the bottom of the end hole having an arc groove, and the bottom of the standard part contacting the arc groove.

[0007] Furthermore, the column is fitted with a first sleeve, a second sleeve, and a locking nut. The first sleeve and the second sleeve are respectively located on the upper and lower sides of the mounting base to limit the upper and lower positions of the mounting base. The locking nut is located on the upper side of the first sleeve.

[0008] Furthermore, the upper end of the second sleeve is provided with a limiting groove, and the mounting base is provided with a stop block that cooperates with the limiting groove; when the mounting base rotates, the limiting groove limits the stroke of the stop block.

[0009] Furthermore, the mounting base includes a first C-shaped sleeve, a support arm, and a second C-shaped sleeve; the first C-shaped sleeve is fitted onto the column and locked with screws; one end of the support arm is connected to the first C-shaped sleeve, and the other end is connected to the second C-shaped sleeve, the second C-shaped sleeve is connected to the fixing part of the dial gauge and locked with screws.

[0010] Furthermore, the dial is connected to a handle for lifting the dial.

[0011] Furthermore, the standard component includes a standard block and a standard ball. The standard ball is placed on the bottom arc groove of the end hole, and the standard block is placed on the standard ball. The sidewall of the standard block is in contact with the hole wall of the end hole.

[0012] Furthermore, the standard block has gaps between its opposite sides and the wall of the end hole to facilitate finger handling and placement.

[0013] Furthermore, the standard part has a protrusion at the center of its upper end face for contacting the dial needle.

[0014] Furthermore, the base is provided with a lead screw positioning seat for placing and positioning the lead screw to be tested.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By using a mounting base that can rotate around the column in conjunction with dial gauges and by using standard parts as an indirect measurement method, we have achieved rapid and accurate full inspection of each EMB ball screw product, which meets the requirements of high precision and high frequency testing and significantly improves testing efficiency.

[0017] By precisely setting the limiting groove and the stop block to limit the rotation stroke of the mounting base, and by ensuring the close contact between the standard parts and the arc groove, the stability and accuracy of the measurement process are ensured, thereby guaranteeing the reliability of the test results.

[0018] This invention solves the problems of low efficiency and inability to perform full inspection when using traditional coordinate measuring machines to detect the arc depth of EMB ball screws, providing strong support for high-precision and high-frequency testing of automotive EMB ball screws. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the detection device in one embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the mounting base in one embodiment of this application;

[0022] Figure 3 This is a cross-sectional view of the detection device at the lead screw being measured in one embodiment of this application;

[0023] In the diagram: 1. Base; 2. Column; 3. Mounting seat; 4. Dial gauge; 5. Measured lead screw; 6. Standard part; 7. First sleeve; 8. Second sleeve; 8a. Limiting groove; 9. Locking nut; 10. First C-type sleeve; 10a. Stop block; 11. Support arm; 12. Second C-type sleeve; 13. Handle; 14. Standard block; 14a. Protrusion; 15. Standard ball; 16. Lead screw positioning seat. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] With increasingly stringent environmental requirements, the automotive industry is accelerating its transition to electrification and autonomous driving. EMB (Electric Braking System), a key component of the electric braking system, enables high-precision control and supports independent control of the braking force of each tire, thereby improving cornering performance and fuel efficiency. Ball screws, due to their efficient conversion between rotational and linear forces, consist of a screw, nut, balls, and a reverser, achieving transmission through the rolling friction of the internal balls. They offer advantages such as high transmission efficiency, long service life, and high working precision, making them a crucial transmission element for achieving precise control in EMB.

[0029] Due to the unique structure of automotive EMB ball screws, the curved surface is located below the inner hole of the screw, making it impossible to measure with ordinary measuring tools. Currently, the industry standard for inspecting the depth of the curved surface is to use a coordinate measuring machine (CMM) to locate and inspect points. However, this method only allows for sampling and cannot achieve full inspection because CMM inspection is slow and cannot keep up with production pace. The depth of the curved surface is a crucial characteristic dimension of EMB ball screws, requiring high precision and small tolerances. This necessitates even higher precision requirements for the inspection equipment and more frequent inspections. Only full inspection can guarantee the quality and precision of the product.

[0030] To address the above technical issues, such as Figures 1 to 3 As shown, this application embodiment provides an EMB ball screw arc groove detection device, including a base 1, a column 2 connected to the base 1, a mounting base 3 connected to the column 2, and the mounting base 3 being rotatable around the axis of the column 2; the mounting base 3 is connected to a dial gauge 4, so that the dial gauge 4 is in a vertical position with the pointer pointing downwards; the ball screw 5 to be tested is placed vertically on the base 1, located on one side of the column 2; a standard part 6 is included, which is used to place in the end hole of the ball screw 5 to be tested, and the bottom of the end hole is provided with an arc groove, and the bottom of the standard part 6 is in contact with the arc groove.

[0031] During testing, the lead screw 5 to be tested is placed vertically and stably on the base 1, ensuring it is positioned to one side of the column 2. Then, the standard part 6 is precisely inserted into the end hole of the lead screw 5. This end hole has a specific arc-shaped groove at its bottom, and the bottom of the standard part 6 is in close contact with this groove. During operation, first, the dial indicator 4 is lifted to contact the end face of the lead screw 5, and the reading is zeroed to set the reference. Next, the horizontally rotated mounting base 3 moves the dial indicator 4 above the center of the standard part 6, at which point the dial indicator is lowered for measurement. By reading the dial indicator value and adding it to the known dimensions of the standard part 6, the depth of the arc-shaped groove can be accurately calculated.

[0032] By using a mounting base 3 that can rotate around the column 2 in conjunction with a dial gauge 4, and by using standard parts 6 as an indirect measurement method, not only is the detection efficiency improved, but the accuracy and reliability of the detection results are also ensured.

[0033] This device can perform rapid and accurate full inspection on each product, meeting the high-precision and high-frequency testing requirements of automotive EMB ball screws, and ensuring the consistency and stability of product quality.

[0034] This testing device solves the problems of low efficiency and inability to achieve full inspection when traditional coordinate measuring machines are used to test the arc surface depth of EMB ball screws.

[0035] In some embodiments, the column 2 is fitted with a first sleeve 7, a second sleeve 8 and a locking nut 9. The first sleeve 7 and the second sleeve 8 are respectively located on the upper and lower sides of the mounting base 3 to limit the upper and lower positions of the mounting base 3. The locking nut 9 is located on the upper side of the first sleeve 7.

[0036] The first sleeve 7 and the second sleeve 8 limit the vertical position of the mounting base 3 on the column 2, ensuring its stability during rotation; through cooperation with the locking nut 9, the mounting base 3 is precisely limited and securely fixed, ensuring the measurement accuracy of the dial gauge 4 during the testing process.

[0037] In some embodiments, the upper end of the second sleeve 8 is provided with a limiting groove 8a, and the mounting base 3 is provided with a stop block 10a that cooperates with the limiting groove 8a; when the mounting base 3 rotates, the limiting groove 8a limits the stroke of the stop block 10a.

[0038] By precisely setting the shape and size of the limiting groove 8a, it is ensured that the stop block 10a can only move within a limited range during rotation, thereby effectively limiting the rotational stroke of the mounting base 3. Preferably, when the mounting base 3 rotates to the limiting position, the dial indicator needle points exactly to the center of the standard part 6, thereby simplifying operation and ensuring detection accuracy.

[0039] In some embodiments, the mounting base 3 includes a first C-shaped sleeve 10, a support arm 11, and a second C-shaped sleeve 12; the first C-shaped sleeve 10 is fitted onto the column 2 and locked with screws; one end of the support arm 11 is connected to the first C-shaped sleeve 10, and the other end is connected to the second C-shaped sleeve 12; the second C-shaped sleeve 12 is connected to the fixing part of the dial gauge 4 and locked with screws.

[0040] By connecting the first C-type sleeve 10 and the second C-type sleeve 12 to the column 2 and the dial gauge 4 respectively, a stable connection between the mounting base 3 and the two is achieved, which facilitates processing, assembly and maintenance.

[0041] In some embodiments, the hands are connected to a handle 13 for pulling the hands. The handle 13 improves ease of operation, allowing operators to pull the hands more easily and accurately.

[0042] In some embodiments, the standard component 6 includes a standard block 14 and a standard ball 15. The standard ball 15 is placed on the bottom arc groove of the end hole, and the standard block 14 is placed on the standard ball 15. The sidewall of the standard block 14 contacts the hole wall of the end hole.

[0043] During measurement, the standard ball 15 is placed on the bottom arc groove of the end hole of the lead screw 5 being measured. The spherical design of the standard ball 15 provides a higher degree of fit with the arc groove, enabling it to more accurately reflect the depth information of the arc groove. The contact between the side wall of the standard block 14 and the end hole wall enhances the stability of the standard part 6 within the end hole, preventing shaking or offset during the measurement process and improving the reliability of the measurement.

[0044] In some embodiments, the opposite sides of the standard block 14 have gaps with the wall of the end hole to facilitate finger handling and placement. The gaps between the opposite sides of the standard block 14 and the wall of the end hole allow operators to easily pinch the sides of the standard block 14 with their fingers to remove or place it from the end hole without using additional tools or applying excessive force, greatly facilitating the handling of the standard block 14.

[0045] In some embodiments, a protrusion 14a is provided at the center of the upper end face of the standard part 6 for contacting the pointer. By using the protrusion 14a as the contact point of the pointer, the operator can more intuitively observe the contact between the pointer and the protrusion 14a, avoiding deviations during the measurement process.

[0046] In some embodiments, the base 1 is provided with a lead screw positioning seat 16 for placing and positioning the lead screw 5 to be tested.

[0047] The shape and size of the lead screw positioning seat 16 match the lead screw 5 being measured, ensuring stable positioning of the lead screw 5 during the measurement process and avoiding measurement errors caused by lead screw movement. Operators only need to place the lead screw 5 on the lead screw positioning seat 16 to begin measurement, improving measurement efficiency.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An EMB ball screw cam groove detection device, characterized by, It comprises a base (1), which is connected with a stand column (2), the stand column (2) is connected with a mounting seat (3), the mounting seat (3) can rotate around the axis of the stand column (2); The mounting seat (3) is connected with a surface measuring tool (4), so that the surface measuring tool (4) is in a vertical posture with the hands of the clock downward; A measured lead screw (5) is placed in a vertical posture on the base (1) and is located on one side of the stand column (2); It comprises a standard part (6), which is placed in an end hole of the measured lead screw (5), the bottom of the end hole is provided with an arc groove, and the bottom of the standard part (6) is in contact with the arc groove.

2. The EMB ball screw cam slot inspection device of claim 1, wherein, The stand column (2) is sleeved with a first pipe sleeve (7), a second pipe sleeve (8) and a locking nut (9), the first pipe sleeve (7) and the second pipe sleeve (8) are respectively arranged on the upper side and the lower side of the mounting seat (3) and are used for limiting the mounting seat (3) upward and downward, and the locking nut (9) is arranged on the upper side of the first pipe sleeve (7).

3. The EMB ball screw cam slot inspection device of claim 2, wherein, The upper end of the second pipe sleeve (8) is provided with a limiting groove (8a), and the mounting seat (3) is provided with a stop block (10a) matched with the limiting groove (8a); when the mounting seat (3) rotates, the limiting groove (8a) limits the stroke of the stop block (10a).

4. The EMB ball screw cam slot inspection device of claim 1, wherein, The mounting seat (3) comprises a first C-shaped sleeve (10), a supporting arm (11) and a second C-shaped sleeve (12); the first C-shaped sleeve (10) is sleeved on the stand column (2) and is locked by a screw; one end of the supporting arm (11) is connected with the first C-shaped sleeve (10), the other end is connected with the second C-shaped sleeve (12), the second C-shaped sleeve (12) is connected with a fixed part of the surface measuring tool (4) and is locked by a screw.

5. The EMB ball screw cam slot inspection device of claim 1, wherein, The hands are connected with a handle (13) for lifting the hands.

6. The EMB ball screw cam slot inspection device of claim 1, wherein, The standard part (6) comprises a standard block (14) and a standard ball (15), the standard ball (15) is placed on the bottom arc groove of the end hole, the standard block (14) is placed on the standard ball (15), and the side wall of the standard block (14) is in contact with the hole wall of the end hole.

7. The EMB ball screw cam slot inspection device of claim 6, wherein, The opposite sides of the standard block (14) have gaps with the hole wall of the end hole, so that the fingers can be conveniently pinched to take and place.

8. The EMB ball screw cam slot inspection device of claim 1, wherein, The upper end surface of the standard part (6) is provided with a protrusion (14a) at the center, which is used for contacting the hands.

9. The EMB ball screw cam slot inspection device of claim 1, wherein, The base (1) is provided with a lead screw positioning seat (16) for placing and positioning the measured lead screw (5).

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