Brake shoe outer circle detection device

Abstract

The utility model discloses a device for detecting the outer circle of a brake shoe. The device comprises a mounting plate, a support, a cover body, a zipper and a handle, the support and the handle are arranged on the mounting plate, the cover body movably covers the support, one end of the zipper is connected with the handle, and the other end of the zipper extends to the support and can be clamped with a brake shoe; wherein the cover body is provided with a plurality of detection blocks, each detection block is provided with a plurality of detection holes, and the detection holes can be used for the insertion of dial indicators. The device is matched with the dial indicator to detect the cylindricity and the coaxiality of the brake shoe, the design of the zipper and the handle can simulate the effect of a hand brake during parking, then the coaxiality and the cylindricity of the outer circle of the brake shoe are confirmed through the reading of a pointer on the dial indicator, and the step can confirm the numerical value. Whether the attaching state of the brake shoe meets the size requirement or not can be accurately judged, that is, whether the brake shoe is completely and tightly attached to the inner wall of the brake drum or not during parking is detected.

Description

Technical Field

[0001] The utility model relates to the technical field of brake shoe detection, in particular to a brake shoe outer circle detection device. Background Art

[0002] like Figure 1 and Figure 2 As shown, Figure 1 A drum brake is shown, Figure 2 for Figure 1 Schematic diagram of the structure of the brake shoe, return spring and handbrake; the drum brake includes a chassis 101, a brake drum 102, a return spring 103, a handbrake 104 and a brake shoe 105. The brake drum 102 is covered on the chassis 101, the brake shoe 105 is mounted on the chassis 101, and the handbrake 104 is mounted on the brake shoe 105. The vehicle is parked using the handbrake drum brake, and the vehicle is parked with the handbrake. The handbrake 104 drives the brake shoe 105 to contact the brake drum 102 to generate static friction, thereby achieving the purpose of parking braking.

[0003] The brake shoe 105 may have unqualified cylindricity and coaxiality, and the brake shoe 105 may not fit tightly against the inner wall of the brake drum 102 when parking, resulting in insufficient static friction, reduced parking performance and drag brake problems. Therefore, it is urgently necessary to provide a device that can detect the cylindricity and coaxiality of the brake shoe and whether the brake shoe 105 fits tightly against the inner wall of the brake drum 102 when parking. Utility Model Content

[0004] In view of the above problems existing in the prior art, a device for detecting the outer circle of a brake shoe is provided.

[0005] The specific technical solutions are as follows:

[0006] A brake shoe outer circle detection device mainly includes: a mounting plate, a support, a cover, a zipper and a handle;

[0007] The support and the handle are mounted on the mounting plate, the cover body is movably mounted on the support, one end of the zipper is connected to the handle, and the other end of the zipper extends toward the support and can be engaged with the brake shoe;

[0008] The cover body is provided with a plurality of detection blocks, each of which is provided with a plurality of detection holes, and the detection holes can be used for inserting a dial indicator.

[0009] The above-mentioned brake shoe outer circle detection device also has the following feature: the cover body is sleeved on the support, and the cover body is rotatably arranged.

[0010] The above-mentioned brake shoe outer circle detection device also has the following characteristics: the cover body includes a cover plate and an annular body arranged on the cover plate, and the detection block is arranged on the annular body.

[0011] The above-mentioned brake shoe outer circle detection device also has the following characteristics: the cover plate is provided with a mounting hole, a bearing is provided in the mounting hole, and the bearing is sleeved on the support.

[0012] The above-mentioned brake shoe outer circle detection device also has the following feature: each detection block is provided with three detection holes arranged along the axial direction of the cover body.

[0013] The above-mentioned brake shoe outer circle detection device also has such a feature that the other end of the zipper is provided with a hook or an annular ring.

[0014] The above-mentioned brake shoe outer circle detection device also has the following characteristics: the support is a stepped column, the support has a positioning step 1 for installing and positioning the brake shoe, and a plurality of positioning columns are provided on the stepped surface of the positioning step 1.

[0015] The above-mentioned brake shoe outer circle detection device also has the feature that a locking piece is sleeved on the top end of the support.

[0016] The above-mentioned brake shoe outer circle detection device also has the following characteristics: the top end of the support is provided with an external thread, and the locking member is a nut.

[0017] The positive effects of the above technical solution are:

[0018] The utility model provides a brake shoe outer circle detection device, which can detect the cylindricity and coaxiality of the brake shoe in conjunction with a dial indicator. The design of the zipper and the handle can simulate the effect of the handbrake when parking. The coaxiality and cylindricity of the brake shoe outer circle are then confirmed by the pointer reading on the dial indicator. This step can confirm the value and accurately determine whether the brake shoe fitting state meets the size requirements, that is, to detect whether the brake shoe and the inner wall of the brake drum are completely and tightly fitted when parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a drum brake that can be tested by the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the brake shoe, return spring and handbrake;

[0021] Figure 3 This is a schematic diagram of the exploded structure of the brake shoe outer circle detection device provided by the utility model;

[0022] Figure 4 This is a front structural diagram of the brake shoe outer circle detection device provided by the utility model;

[0023] Figure 5 for Figure 4 Schematic diagram of the cross-section structure.

[0024] In the accompanying drawings: 101, chassis; 102, brake drum; 103, return spring; 104, handbrake; 105, brake shoe; 201, mounting plate; 202, support; 2021, positioning step one; 2022, positioning step two; 203, cover body; 2031, cover plate; 2032, annular body; 2033, positioning convex ring; 204, zipper; 205, handle; 206, detection hole; 207, dial indicator; 208, mounting hole; 209, annular ring; 210, locking piece; 211, bearing; 212, positioning column. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0028] Please refer to Figures 3 to 5 , Figure 3 This is a schematic diagram of the exploded structure of the brake shoe outer circle detection device provided by the utility model; Figure 4 This is a front structural diagram of the brake shoe outer circle detection device provided by the utility model;

[0029] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure, the utility model discloses a brake shoe outer circle detection device, the brake shoe outer circle detection device includes: a mounting plate 201, a support 202, a cover 203, a zipper 204 and a handle 205;

[0030] The mounting plate 201 is a plate-shaped member, and the cover 203 is a cover-shaped member.

[0031] The support 202 and the handle 205 are mounted on the mounting plate 201 , and the cover 203 is movably mounted on the support 202 .

[0032] Optionally, the support 202 is a stepped column, having a positioning step 1 2021 for mounting and positioning the brake shoe 105. Several positioning posts 212 are provided on the stepped surface of the positioning step 1 2021. Specifically, the positioning step 1 2021 serves a positioning function, and the dimensional accuracy of the positioning step 1 2021 needs to be designed according to the standard accuracy of the chassis 101. To facilitate the installation and positioning of the cover 203, the support 202 is further provided with a positioning step 2022 on the end of the stepped surface of the positioning step 1 2021 away from the mounting plate 201. The cover 203 is correspondingly provided with a positioning collar 2033, the end surface of which mates with the stepped surface of the positioning collar 2032. The positioning posts 212 are used to position the structure to be inspected placed on the stepped surface of the positioning step 1 2021.

[0033] Optionally, in this embodiment, the cover 203 is sleeved on the support and is rotatable. Specifically, the cover 203 includes a cover plate 2031 and an annular body 2032 disposed on the cover plate 2031. Optionally, in one embodiment, the cover 2031 is provided with a mounting hole 208, within which a bearing 211 is disposed. The bearing 211 is sleeved on the support 202, enabling the cover 203 to be rotatable. The detection block is disposed on the annular body 2032. Optionally, in this embodiment, the cover 2031 can be a circular plate or a radial plate. For example, in one embodiment, the cover 2031 is a radial plate with six branches, each connected to the annular body 2032. The annular body 2032 includes an annular body with the same axial length. The body has six axially extending protrusions on the side facing the cover 2031, and the protrusions are connected to the branches of the cover 2031. In other embodiments, the annular body 2032 may include only an annular main body.

[0034] Among them, the cover body 203 is provided with a plurality of detection blocks, each of which is provided with a plurality of detection holes 206, and the detection holes 206 can be used for inserting the dial indicator 207. As before, the protrusion and the main body of the annular body 2032 form a detection block, and the detection holes 206 are provided on the detection block. Specifically, in this embodiment, the detection holes 206 are provided on the protrusion and the main body, and the detection holes 206 extend from the protrusion to the main body. Optionally, in this embodiment, each detection block is provided with three detection holes 206 arranged along the axial direction of the cover body 203. Of course, the number of detection holes 206 provided on each detection block is the same. Optionally, the number of detection blocks can be at least three, for example, three, four, five, six (as before) or even more than six.

[0035] Furthermore, a locking member 210 is sleeved on the top of the support 202. Optionally, in this embodiment, the top of the support 202 is provided with external threads, and the locking member 210 is a nut. Of course, the locking member 210 can also be a finger-clip or snap-fit structure. The locking member 210 is used to lock the structure to be inspected placed on the stepped surface of the first positioning step 2021.

[0036] One end of the zipper 204 is connected to the handle 205 , and the other end of the zipper 204 extends toward the support 202 and can be engaged with the brake shoe 105 .

[0037] The other end of the zipper 204 is provided with a hook or an annular ring 209. For example, in this embodiment, the other end of the zipper 204 is provided with an annular ring 209, which is hooked with the handbrake on the brake shoe 105 to achieve the connection between the zipper 204 and the brake shoe 105.

[0038] Will Figure 1The combination of the brake shoe 105, the return spring 103, and the handbrake 104 is called the structure to be detected. The operation method of the brake shoe outer circle detection device provided by the present utility model is as follows:

[0039] First, loosen the handle 205 to make the pull cord 204 in a free state. Place the structure to be detected on the support 202 for positioning. Then, fasten the other end of the pull cord 204 to the handbrake 104 on the brake shoe 105. Install the brake shoe 105 into the support 202, which can be locked with the locking member 210. Pull the handle 205 by hand to expand the brake shoe 105 outward, so that the brake shoe 105 is locked to the inner wall of the cover 203 (the inner wall of the annular body 2032 of the cover 203). The naked eye can check whether the brake shoe 105 fits the inner wall of the annular body 2032 of the cover 203 through each detection hole 206 in the cover 203. A feeler gauge can be used for a preliminary judgment of whether there is a gap. Therefore, the accuracy requirement for the inner wall of the annular body 2032 is relatively high and needs to be designed according to the inner wall of the brake drum 102. The dial indicator 207 can be used to detect each detection hole 206 on each detection block. By comparing the height differences of the dial indicator 207, the cylindricity or coaxiality value of the brake shoe 105 in the static state can be obtained. Loosen the handle 205. After the return spring 103 contracts and resets the brake shoe 105, there is a theoretical relative gap between the brake shoe 105 and the cover 203. Then, rotate the cover 203 by hand 360°. Whether the rotation is smooth can check whether there is interference or dragging phenomenon between the brake shoe 105 and the inner wall of the cover 203, so as to determine whether the two brake shoes 105 are deformed or misaligned after resetting. Pass the dial indicator 207 through the detection hole 206 near the cover plate 2031 and rotate the cover 203 by hand 360°. When the cover 203 is rotating dynamically, visually confirm the deflection of the pointer of the dial indicator 207, and obtain the runout and cylindricity of the top end of the brake shoe 105 and record them. According to the above steps, check the middle detection hole 206 in turn to confirm the dynamic runout and cylindricity of the middle end of the brake shoe 105, and finally check the detection hole 206 far from the cover plate 2031 to confirm the dynamic runout and cylindricity of the bottom end of the brake shoe 105. After the detection is completed, take out the locking member 210, disconnect the pull cord 204 from the handbrake 104 on the brake, and then take out the structure to be detected from the support 202 to complete all operations and detections.

[0040] Among them, cylindricity refers to the difference between the maximum size and the minimum size of any vertical section. The tolerance zone of cylindricity is the area between two coaxial cylindrical surfaces, and the radial distance between the two coaxial cylindrical surfaces is the tolerance value. The measurement methods include two-point method, three-point method, coordinate measuring method, and data acquisition instrument connected to a dial indicator measurement method. From the previous methods, the values of at least three points on the outer side of the brake shoe 105 can be easily obtained, and the cylindricity of the brake shoe 105 can be determined. As before, the brake shoe outer circle detection device provided by the present utility model can measure both static cylindricity and dynamic cylindricity.

[0041] Coaxiality is the positioning tolerance, with the theoretically correct position being the reference axis. Coaxiality tolerance controls the degree of misalignment between the measured axis, which should theoretically be coaxial, and the reference axis. Coaxiality error refers to the change in the position of the measured axis relative to the reference axis. Simply put, it means the degree of misalignment between two axes on a part that are required to be coaxial. This misalignment is typically a combination of three conditions (assuming the reference axis is an ideal straight line): bending of the measured axis, tilting of the measured axis, and offset of the measured axis. Coaxiality error reflects the misalignment of the centers of the circles on the cross section. Since the brake shoe 105 comprises two arc-shaped structures, each with an axis, the axes of the two arcs should theoretically be coaxial. However, in reality, the axes of the two arcs deviate. As previously mentioned, by obtaining numerical values at at least three points on the outer surfaces of the two brake shoes 105, the axis of each outer surface can be deduced, and the coaxiality of the two arc-shaped structures of the brake shoe 105 can be determined.

[0042] The brake shoe outer circle detection device provided by the utility model is not only applicable to the drum brake described above (such as Figure 1 and Figure 2 ) detection, and can also be applied to many other drum brakes.

[0043] The brake shoe outer circle detection device provided by the present invention can detect the cylindricity and coaxiality of the brake shoe 105 in conjunction with the dial indicator 207. The design of the zipper 204 and the handle 205 can simulate the effect of the handbrake when parking. Then, the coaxiality and cylindricity of the outer circle of the brake shoe 105 are confirmed by the pointer reading on the dial indicator 207. This step can confirm the value and accurately determine whether the fitting state of the brake shoe 105 (whether the fitting state of the brake shoe 105 with the inner wall of the annular body 2032 of the cover body 203) meets the size requirements, that is, to detect whether the brake shoe 105 is completely and tightly fitted with the inner wall of the brake drum 102 when parking.

[0044] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A brake shoe outer circle detection device, characterized in that: include: Mounting plate, support, cover, zipper and handle; The support and the handle are mounted on the mounting plate, the cover body is movably mounted on the support, one end of the zipper is connected to the handle, and the other end of the zipper extends toward the support and can be engaged with the brake shoe; The cover body is provided with a plurality of detection blocks, each of which is provided with a plurality of detection holes, and the detection holes can be used for inserting a dial indicator.

2. The brake shoe outer circle detection device according to claim 1, characterized in that: The cover body is sleeved on the support, and the cover body is rotatable.

3. The brake shoe outer circle detection device according to claim 2, characterized in that: The cover body includes a cover plate and an annular body arranged on the cover plate, and the detection block is arranged on the annular body.

4. The brake shoe outer circle detection device according to claim 3, characterized in that: The cover plate is provided with a mounting hole, a bearing is provided in the mounting hole, and the bearing is sleeved on the support.

5. The brake shoe outer circle detection device according to claim 3, characterized in that: Each of the detection blocks is provided with three detection holes arranged along the axial direction of the cover body.

6. The brake shoe outer circle detection device according to any one of claims 1 to 5, characterized in that: The other end of the zipper is provided with a draw hook or an annular ring.

7. The brake shoe outer circle detection device according to any one of claims 1 to 5, characterized in that: The support is a stepped column, and the support has a positioning step 1 for installing and positioning the brake shoe, and a plurality of positioning columns are arranged on the stepped surface of the positioning step 1.

8. The brake shoe outer circle detection device according to any one of claims 1 to 5, characterized in that: The top end of the support is sleeved with a locking piece.

9. The brake shoe outer circle detection device according to claim 8, characterized in that: The top end of the support is provided with an external thread, and the locking piece is a nut.

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