Automobile crankshaft detection device and method

Abstract

The invention discloses an automobile crankshaft detection device and method, and relates to the technical field of automobile engine crankshaft forging. The device comprises a base plate, main journal positioning blocks which are oppositely arranged are connected to the upper surface of the base plate, the main journal positioning blocks comprise the first main journal positioning block and the second main journal positioning block which are the same in structure, and a connecting rod neck limiting block is arranged in front of the first main journal positioning block; the lower end of the connecting rod neck limiting block is connected to the upper surface of the base plate; the automobile crankshaft detection device further comprises a height measuring device. The method comprises the following steps: placing a crankshaft on the automobile crankshaft detection device; rotating and fixing the crankshaft; measuring the height value of the to-be-measured part of the crankshaft; and judging whether the detection result is qualified. The device is simple in structure and convenient to operate, ensures the accuracy of a detection result, improves the detection efficiency, is also suitable for rapid verification of a field process, and solves the problems that the space angle cannot be detected and the detection efficiency is low in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile engine crankshaft forging, and in particular to an automobile crankshaft detection device and method. Background Art

[0002] Currently, passenger car crankshafts are generally classified into three-cylinder, four-cylinder, six-cylinder, eight-cylinder, and twelve-cylinder crankshafts according to engine type. Engines with different cylinder numbers have different requirements for crankshaft structure and performance. For example, the six-cylinder crankshaft has a special structure and a 120° connecting rod neck arrangement, which places higher requirements on the molding process and testing methods. For the names of the various parts of the V-type six-cylinder crankshaft and the connecting rod neck arrangement, please refer to Figure 1 and Figure 2 As shown, the crankshaft includes a J1 main journal 1 ′, a J4 main journal 2 ′, a P1 connecting rod journal 3 ′, a P2 connecting rod journal 4 ′, a P3 connecting rod journal 5 ′, a W5 balancing mass 6 ′ and a W6 balancing mass 7 ′.

[0003] The V-type six-cylinder crankshaft is made using a horizontal parting + torsion forming process; in this process, the connecting rod neck angle is guaranteed by the torsion process, and the torsion forming process requires the angle of each connecting rod neck to be detected.

[0004] There is a difference between process inspection and full-size inspection. Full-size inspection is generally performed on the first piece at the beginning of a shift or the last piece at the end of a shift. It is usually carried out using three-dimensional coordinate measurement and only requires one inspection per shift or one inspection per mold number. Process inspection verifies the key dimensions and shapes of forgings during the production process. It does not detect all dimensional and shape variations of the product and requires several inspections per shift. However, existing inspection methods have the following limitations:

[0005] First, it can only detect axial dimensions. The existing integral sample fixture mainly detects axial dimensions and cannot meet the detection requirements of forging dimensions such as angles.

[0006] The second is the low efficiency of full-size inspection. Although the three-coordinate full-size inspection and forging scanning inspection have high accuracy, the inspection efficiency is low, and only 1-2 pieces can be inspected per shift, which cannot meet the needs of large-scale inspection or 100-item inspection. It cannot detect angle changes in real time, nor can it discover and solve problems in production in a timely manner.

[0007] CN107228614B discloses a six-cylinder crankshaft phase angle detection device and method, comprising a measuring bracket, a connecting rod journal positioning block, a dial indicator, and a connecting shaft. The device comprises two measuring brackets, one at each end of the connecting shaft, and five dial indicators mounted on the connecting shaft between the two measuring brackets. A connecting rod positioning block is disposed between the measuring bracket at one end of the connecting shaft and an adjacent dial indicator. The two measuring brackets are mounted on the outer circumferences of the first and seventh main journals of the six-cylinder crankshaft, respectively. The connecting rod journal positioning block is in close contact with the outer circumference of the first connecting journal of the six-cylinder crankshaft. The five dial indicators are mounted on the outer circumferential side surfaces of the second, third, fourth, fifth, and sixth connecting journals of the six-cylinder crankshaft, perpendicular to the centerline connecting the corresponding connecting journals and the main journals. However, this prior art has a complex structure and is not fast enough for detection.

[0008] CN220153439U belongs to the technical field of passenger car forging gauges, specifically relating to a passenger car crankshaft forging gauge; wherein an angle detection block support seat, eight balancing block detection blocks, five spindle diameter positioning V-blocks, and four connecting rod diameter support blocks are fixed in sequence from front to back on the left side of a base plate; a balancing block detection block and a spindle diameter positioning V-block are fixed in sequence from front to back on the substantially right side; a four-five balancing block detection block is fixed above the one balancing block detection block and the four connecting rod diameter support blocks; a two connecting rod diameter support block is fixed at the front end of the four-five balancing block detection block; the front end of the eight balancing block sector angle detection block is movably connected to the angle detection block support seat, and the rear end of the eight balancing block sector angle detection block is snapped onto the eight balancing block detection blocks and the five spindle diameter positioning V-blocks. However, this prior art uses a through-type measurement method, resulting in low measurement accuracy and poor versatility. Summary of the Invention

[0009] The purpose of the present invention is to provide an automobile crankshaft detection device and method for process detection, which has a simple structure and is easy to operate. While ensuring the accuracy of the detection results, it not only improves the detection efficiency, but is also suitable for rapid verification of on-site processes, solving the problems of the existing technology that cannot detect spatial angles and has low detection efficiency.

[0010] The present invention provides the following solutions

[0011] A vehicle crankshaft detection device includes a base plate, the upper surface of which is connected to relatively arranged main journal positioning blocks, the main journal positioning blocks including a first main journal positioning block and a second main journal positioning block of identical structure, a connecting rod neck limit block is arranged in front of the first main journal positioning block, and the lower end of the connecting rod neck limit block is connected to the upper surface of the base plate; the vehicle crankshaft detection device also includes a height measuring device.

[0012] Furthermore, the first main shaft neck positioning block includes a base, which is connected to the upper surface of the base plate, and the upper end of the base is fixedly connected to a support seat, and the upper end of the support seat is provided with a V-shaped groove; the connecting rod neck limit block includes a connecting seat, the lower end of the connecting seat is connected to the base plate, and the front end of the connecting seat is vertically fixedly connected to the limiting plate, and a limiting groove is provided on the left side of the limiting plate, and the lower middle part of the limiting groove is arc-shaped.

[0013] Furthermore, the connecting seat of the connecting rod neck limiting block is arranged on the right side of the base of the first main shaft neck positioning block, and the limiting plate is arranged in front of the first main shaft neck positioning block.

[0014] Furthermore, the first main journal positioning block, the second main journal positioning block and the connecting rod neck limiting block are all fixedly connected to the base plate.

[0015] Furthermore, the first main shaft neck positioning block is fixedly connected to the upper surface of the base plate, and the base of the second main shaft neck positioning block is detachably connected to the upper surface of the base plate; the lower end of the connecting seat of the connecting rod neck limit block is slidably connected to the upper surface of the base plate.

[0016] Furthermore, the upper surface of the base plate is provided with a plurality of groups of positioning holes, each group of positioning holes includes a threaded hole and a pin hole, the lower surface of the base of the second main shaft neck positioning block is provided with a positioning pin that matches the pin hole, and the lower surface of the base is provided with a connecting hole corresponding to the threaded hole, the connecting hole is a through hole, a threaded rod is passed through the connecting hole, and the base and the base plate can be screwed together and fixed by the threaded rod that passes through the connecting hole and is threadedly connected to the threaded hole;

[0017] A sliding groove is provided on the upper surface of the base plate on the right side of the first and second main shaft neck positioning blocks along the front-to-back direction, and a slider is provided at the bottom end of the connecting seat of the connecting rod neck limit block, and the slider is slidably connected to the sliding groove; the upper end of the slider is fixedly connected to a fastening screw, and the fastening screw is passed through the connecting seat, and the upper end of the fastening screw protrudes from the upper surface of the connecting seat and is threadedly connected to a fastening nut.

[0018] A method for detecting an automobile crankshaft, based on the above-mentioned automobile crankshaft detection device, comprises the following steps:

[0019] Place the crankshaft on the automobile crankshaft detection device;

[0020] Rotate the crankshaft and secure it;

[0021] Measure the height of the crankshaft part to be tested;

[0022] Determine whether the test results are qualified.

[0023] Furthermore, placing the crankshaft on the automobile crankshaft detection device includes:

[0024] Place the crankshaft's J1 main journal into the V-shaped groove of the first main journal positioning block, and place the crankshaft's J4 main journal into the V-shaped groove of the second main journal positioning block. Fine-tune the crankshaft so that the center of the V-shaped groove is as close as possible to the middle of the two main journals.

[0025] The rotating crankshaft and fixing it include:

[0026] Rotate the crankshaft clockwise until the P1 connecting rod neck stops at the connecting rod neck stop block and secure it;

[0027] The height value of the crankshaft to be measured portion is measured,

[0028] Use a height measuring device to measure the height H3 of the top of the P3 connecting rod neck, where H3 is the vertical distance from the top of the P3 connecting rod neck to the bottom surface of the base plate;

[0029] The determination of whether the test result is qualified includes:

[0030] Compare H3 with the preset first standard height H0 and calculate the first height difference N, N=|H3-H0|, and compare N with the preset first height difference limit N'.

[0031] If N≤N', the test result is qualified.

[0032] If N>N', the test result is unqualified.

[0033] Furthermore, the height value of the crankshaft to be measured also includes:

[0034] Use a height measuring device to measure the height H5 of the W5 balancing block and the height H6 of the W6 balancing block, where H5 and H6 are the vertical distances from the top of the W5 balancing block and the top of the W6 balancing block to the bottom surface of the substrate respectively;

[0035] The determination of whether the test result is qualified also includes:

[0036] Compare H5 with the preset second standard height H50 and calculate the second height difference N2, N2=|H5-H50|, and compare N2 with the preset second height difference limit N2'.

[0037] If N2≤N2', the test result is qualified.

[0038] If N2>N2', the test result is unqualified;

[0039] Compare H6 with the preset third standard height H60 and calculate the third height difference N3, N3=|H6-H60|, and compare N3 with the preset third height difference limit N3'.

[0040] If N3≤N3', the test result is qualified.

[0041] If N3>N3', the test result is unqualified.

[0042] Furthermore, after measuring the height value of the crankshaft to be measured, the method further includes the following steps:

[0043] Calculate the torsion angle of the P3 connecting rod neck;

[0044] The calculation method of the torsion angle of the P3 connecting rod neck is as follows:

[0045]

[0046] Where: N is the first height difference, B is the torsion angle, and R is the distance from the center of the main journal to the center of the P3 connecting rod journal.

[0047] Compared with the prior art, the present invention has the following advantages:

[0048] The automobile crankshaft inspection device and method provided by the present invention have a simple structure, convenient operation, and can effectively detect whether the forging dimensions are qualified; they not only improve the inspection efficiency, but are also suitable for rapid verification during on-site production; during the inspection process, the forging is accurately positioned on the fixture, and the operator only needs to make simple adjustments, reducing measurement errors caused by improper adjustments and ensuring the accuracy and reliability of the inspection results; the inspection fixture can detect and verify key parameters such as spatial angles that cannot be detected by traditional tools such as on-site calipers, providing strong support for quality control of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Attachment Figure 1 This is a schematic structural diagram of the V-type six-cylinder crankshaft described in the background technology;

[0051] Attachment Figure 2 This is a schematic diagram of the connecting rod neck arrangement of the V-type six-cylinder crankshaft described in the background technology;

[0052] Attachment Figure 3 This is a schematic structural diagram of the automobile crankshaft detection device according to Example 1 of the present invention;

[0053] Attachment Figure 4 This is a schematic structural diagram of the main shaft neck positioning block of the present invention;

[0054] Attachment Figure 5 This is a schematic structural diagram of the automobile crankshaft detection device according to Example 2 of the present invention;

[0055] Attachment Figure 6 This is a schematic diagram of the automobile crankshaft detection method of the present invention;

[0056] Attachment Figure 7 This is a schematic diagram of the measurement principle of the automobile crankshaft detection method of the present invention;

[0057] Attachment Figure 8 This is a schematic diagram of the initial placement state and rotation direction of the automobile crankshaft of the present invention;

[0058] Attachment Figure 9 This is a schematic diagram of the position of the automobile crankshaft in the measurement state according to the present invention;

[0059] Attachment Figure 10 A schematic diagram of the measurement principle of the automobile crankshaft detection method according to the present invention from another perspective;

[0060] Attachment Figure 11 Schematic diagram of the conversion principle of torsion angle and height according to the present invention.

[0061] In the picture:

[0062] 1', J1 main journal; 2', J4 main journal; 3', P1 connecting rod journal; 4', P2 connecting rod journal; 5', P3 connecting rod journal; 6', W5 balancing block; 7', W6 balancing block; 1. Base plate; 11. Slide groove; 12. Positioning hole; 121. Threaded hole; 122. Pin hole; 2. Main journal positioning block; 201. Base; 202. Support seat; 203. V-shaped groove; 21. First main journal positioning block; 22. Second main journal positioning block; 221. Threaded rod; 3. Connecting rod journal limit block; 31. Connecting seat; 32. Limit plate; 321. Limit groove; 33. Fastening screw; 34. Fastening nut. DETAILED DESCRIPTION

[0063] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0064] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0065] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0066] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0067] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0068] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0069] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0070] Example 1, please refer to Figure 3 As shown, this embodiment provides an automobile crankshaft detection device, including a base plate 1, which has a rectangular structure. Two main journal positioning blocks 2 arranged opposite to each other are fixedly connected to the upper surface of the base plate 1. The main journal positioning blocks 2 include a first main journal positioning block 21 and a second main journal positioning block 22. A connecting rod neck limit block 3 is provided in front of the first main journal positioning block 21, and the lower end of the connecting rod neck limit block 3 is fixedly connected to the upper surface of the base plate 1; the automobile crankshaft detection device also includes a height measuring device (not shown in the drawings) for measuring the height of any point on the crankshaft.

[0071] Specifically, see Figure 4As shown, the main journal positioning block 2 includes a base 201, which is fixedly connected to the upper surface of the base plate 1, and the upper end of the base 201 is fixedly connected to a support seat 202. The upper end of the support seat 202 is provided with a V-shaped groove 203, which is used to support the main journal of the crankshaft and play a positioning role to ensure that the axis center of the crankshaft is accurately positioned; it can also play a limiting role to prevent the crankshaft from moving left and right after placement; wherein the first main journal positioning block 21 is used to support the J1 main journal 1', and the second main journal positioning block 22 is used to support the J4 main journal 2', and the center distance between the V-shaped grooves 203 of the two main journal positioning blocks 2 is the same as the center distance between the crankshaft J1 main journal 1' and the J4 main journal 2'.

[0072] The connecting rod neck limit block 3 includes a connecting seat 31, which is arranged on the right side of the base 201 of the first main journal positioning block 21 and is fixedly connected to the base plate 1 for avoiding the crankshaft and preventing interference with the crankshaft. The front end of the connecting seat 31 is fixedly connected to the limiting plate 32, and the left side of the limiting plate 32, that is, the side facing the crankshaft, is provided with a limiting groove 321, which can stop the P1 connecting rod neck 3' when the crankshaft is rotated. The middle and lower part of the limiting groove 321 is arc-shaped, which is used to fit the outer wall of the P1 connecting rod neck 3' when in contact with the P1 connecting rod neck 3'.

[0073] See also Figure 6 As shown, this embodiment further provides a method for detecting an automobile crankshaft, based on the above-mentioned automobile crankshaft detection device, comprising:

[0074] Place the crankshaft on the testing device;

[0075] Rotate the crankshaft and secure it;

[0076] Measure the height of the crankshaft part to be tested;

[0077] Determine whether the test results are qualified.

[0078] Specifically, see Figures 7 to 10 As shown, placing the crankshaft on the detection device includes,

[0079] Place the crankshaft's J1 main journal 1' in the V-shaped groove 203 of the first main journal positioning block 21, and place the crankshaft's J4 main journal 2' in the V-shaped groove 203 of the second main journal positioning block 22. Fine-tune the crankshaft so that the center of the V-shaped groove 203 is as close as possible to the middle position of the two main journals.

[0080] Rotate the crankshaft and fix it including,

[0081] Rotate the crankshaft clockwise until the P1 connecting rod neck 3' stops at the connecting rod neck limit block 3. Under normal circumstances, the crankshaft will remain stationary under the action of its own weight and the friction of the V-shaped groove 203. However, there are still some models of crankshafts that cannot remain stationary due to the offset of the center of gravity. They will rotate under the action of their own weight. At this time, external force needs to be applied to fix the crankshaft. You can use a strap or directly support it by hand to keep it stationary.

[0082] The height values ​​of the crankshaft to be measured include:

[0083] The height of the top of the P3 connecting rod neck 5 ′ is measured using a height measuring device. In this embodiment, the height measuring device is a height vernier caliper. The measured height H3 is the vertical distance from the top of the P3 connecting rod neck 5 ′ to the bottom surface of the base plate 1 .

[0084] Judging whether the test results are qualified includes:

[0085] Compare the height H3 measured in the previous step with the preset first standard height H0 and calculate the first height difference N, N=|H3-H0|, and compare N with the preset first height difference limit N'. If N≤N', the test result is qualified; if N>N', the test result is unqualified; in this embodiment, H0=223.2mm, N'=0.8mm.

[0086] The measurement principle of the present invention is that when the crankshaft rotates, the height H of the center of the main journal remains unchanged. When the position of the P1 connecting rod neck 3' is fixed, the position of the P3 connecting rod neck 5' is also a fixed value. If the crankshaft is qualified, the phase angle between the P1 connecting rod neck 3' and the P3 connecting rod neck 5' is 120°. When the P1 connecting rod neck 3' is stopped by the connecting rod neck limit block 3, the line connecting the center of the P1 connecting rod neck 3' and the center of the main journal is exactly in the vertical direction. The horizontal contact point Q between the P1 connecting rod neck 3' and the connecting rod neck limit block 3 is used as the reference point for the design and manufacture of the connecting rod neck limit block 3; the height H3 of the top end of the P3 connecting rod neck 5' is the first standard height H0; if the position of the P3 connecting rod neck 5' changes, the value of H3 will also change accordingly. Therefore, by comparing H3 with H0, it can be determined whether the torsional angle of the crankshaft during the production process is qualified.

[0087] See also Figure 11 As shown, the specific torsion angle B can also be obtained according to the measurement results. The conversion relationship between the torsion angle and the height is as follows:

[0088]

[0089] According to the above formula, the calculation method of B is as follows:

[0090]

[0091] Where: N is the first height difference, B is the torsion angle, and R is the distance from the center of the main journal to the center of the P3 connecting rod journal 5'.

[0092] In some embodiments, measuring the height of the crankshaft portion to be measured further includes:

[0093] A height measuring device is used to measure the heights H5 and H6 of the W5 balancing block 6 ′ and the W6 balancing block 7 ′. H5 and H6 are vertical distances from the top of the W5 balancing block 6 ′ and the top of the W6 balancing block 7 ′ to the bottom surface of the substrate 1 .

[0094] Judging whether the test results are qualified also includes:

[0095] Compare H5 with the preset second standard height H50 and calculate the second height difference N2, N2 = |H5-H50|. Compare N2 with the preset second height difference limit N2'. If N2 ≤ N2', the test result is qualified; if N2 > N2', the test result is unqualified. In this embodiment, H50 = 204 mm and N2' = 2 mm.

[0096] Compare H6 with the preset third standard height H60 and calculate the third height difference N3, N3=|H6-H60|, and compare N3 with the preset third height difference limit N3'. If N3≤N3', the test result is qualified; if N3>N3', the test result is unqualified; in this embodiment, H60=224mm, N3'=2mm.

[0097] The height dimensions of the W5 balancing block 6' and the W6 balancing block 7' are critical dimensions for the cleaning process; the cavity is designed according to the size of the forging. If the size deviation of the non-machined surface of the forging is too large, interference will occur when the product is placed in the cavity, and the cavity cannot be completely closed during vacuum cleaning, which will affect the subsequent cleaning effect.

[0098] Example 2, please refer to Figure 5 As shown, this embodiment provides an automobile crankshaft detection device, which is improved on the basis of Example 1 to enhance the versatility of the device.

[0099] Specifically, the automobile crankshaft detection device includes a substrate 1, which is a rectangular structure. The upper surface of the substrate 1 is connected to two main shaft neck positioning blocks 2 arranged opposite to each other. The main shaft neck positioning blocks 2 include a first main shaft neck positioning block 21 and a second main shaft neck positioning block 22. The first main shaft neck positioning block 21 is fixedly connected to the upper surface of the substrate 1, and the second main shaft neck positioning block 22 is detachably connected to the upper surface of the substrate 1; a connecting rod neck limit block 3 is arranged in front of the first shaft neck positioning block, and the lower end of the connecting rod neck limit block 3 can be slidably connected to the upper surface of the substrate 1; the automobile crankshaft detection device also includes a height measuring device for measuring the height of any point on the crankshaft.

[0100] Specifically, the upper surface of the substrate 1 is provided with multiple groups of positioning holes 12, each group of positioning holes 12 includes a threaded hole 121 and a pin hole 122, the lower surface of the base 201 of the second main shaft neck positioning block 22 is provided with a positioning pin that matches the pin hole 122, and the lower surface of the base 201 is also provided with a connecting hole corresponding to the threaded hole 121, and a threaded rod 221 is passed through the connecting hole, and the lower part of the threaded rod 221 can be threadedly connected to the threaded hole 121, and the base 201 and the substrate 1 can be screwed and fixed by the threaded rod 221; the upper surface of the substrate 1 is provided with multiple groups of positioning holes 12, and the second main shaft neck positioning block 22 is connected with different groups of positioning holes 12 to support crankshafts of different lengths. In this embodiment, each group of positioning holes 12 includes two threaded holes 121 and one pin hole 122, and the three holes are not collinear, so that the second main shaft neck positioning block 22 can be positioned accurately and firmly, thereby ensuring measurement accuracy; different numbers of threaded holes 121 and pin holes 122 in each group can also be set as needed.

[0101] Specifically, a slide groove 11 is provided on the upper surface of the base plate 1 on the right side of the main shaft neck positioning block 2 along the front-to-back direction, and a slider is provided at the bottom end of the connecting seat 31 of the connecting rod neck limit block 3. The slider is slidably connected to the slide groove 11, and the upper end of the slider is fixedly connected to a fastening screw 33. The fastening screw 33 is passed through the connecting seat 31, and the upper end of the fastening screw 33 protrudes from the upper surface of the connecting seat 31 and is threadedly connected to a fastening nut 34. By rotating the fastening nut 34, the connecting seat 31 can be loosened or fixed relative to the slide groove 11.

[0102] The automobile crankshaft detection device provided in this embodiment can be used for detecting crankshafts of different sizes and types by connecting the second main journal positioning block 22 with different groups of positioning holes 12 and sliding the connecting rod neck limit block 3, thereby improving the versatility of the device.

[0103] This embodiment further provides a method for detecting an automobile crankshaft, based on the above-mentioned automobile crankshaft detection device, comprising:

[0104] Adjust the automobile crankshaft detection device;

[0105] Place the crankshaft on the testing device;

[0106] Rotate the crankshaft and secure it;

[0107] Measure the height of the crankshaft part to be tested;

[0108] Determine whether the test results are qualified.

[0109] Specifically, adjusting the automobile crankshaft detection device includes:

[0110] Connect and fix the second main journal positioning block 22 to the corresponding positioning hole 12 according to the model type of the crankshaft to be tested; slide the connecting rod neck limit block 3 back and forth to the position corresponding to the required stop position and fix it.

[0111] The remaining steps are the same as the detection method described in Example 1.

[0112] The automobile crankshaft detection device and method provided in this embodiment can be used to detect six-cylinder crankshafts of different models and specifications, and can also be used to detect the connecting rod neck angle of different types such as eight-cylinder crankshafts. The detection principle and steps are the same as those for six-cylinder crankshafts.

[0113] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An automobile crankshaft detection device, characterized in that: The invention comprises a base plate (1), the upper surface of the base plate (1) is connected to a main shaft neck positioning block (2), the main shaft neck positioning block (2) comprises a first main shaft neck positioning block (21) and a second main shaft neck positioning block (22) having the same structure, a connecting rod neck limiting block (3) is provided in front of the first main shaft neck positioning block (21), and the lower end of the connecting rod neck limiting block (3) is connected to the upper surface of the base plate (1); the automobile crankshaft detection device also comprises a height measuring device.

2. The automobile crankshaft detection device according to claim 1, characterized in that: The first main shaft neck positioning block (21) comprises a base (201), the base (201) is connected to the upper surface of the base plate (1), the upper end of the base (201) is fixedly connected to a support seat (202), and the upper end of the support seat (202) is provided with a V-shaped groove (203); the connecting rod neck limiting block (3) comprises a connecting seat (31), the lower end of the connecting seat (31) is connected to the base plate (1), the front end of the connecting seat (31) is vertically fixedly connected to a limiting plate (32), the left side of the limiting plate (32) is provided with a limiting groove (321), and the lower middle portion of the limiting groove (321) is an arc-shaped structure.

3. The automobile crankshaft detection device according to claim 2, characterized in that: The connecting seat (31) of the connecting rod neck limiting block (3) is arranged on the right side of the base (201) of the first main shaft neck positioning block (21), and the limiting plate (32) is arranged in front of the first main shaft neck positioning block (21).

4. The automobile crankshaft detection device according to claim 3, characterized in that: The first main shaft neck positioning block (21), the second main shaft neck positioning block (22) and the connecting rod neck limiting block (3) are all fixedly connected to the base plate (1).

5. The automobile crankshaft detection device according to claim 3, characterized in that: The first main shaft neck positioning block (21) is fixedly connected to the upper surface of the base plate (1), and the base (201) of the second main shaft neck positioning block (22) is detachably connected to the upper surface of the base plate (1); and the lower end of the connecting seat (31) of the connecting rod neck limiting block (3) is slidably connected to the upper surface of the base plate (1).

6. The automobile crankshaft detection device according to claim 5, characterized in that: The upper surface of the base plate (1) is provided with a plurality of groups of positioning holes (12), each group of the positioning holes (12) includes a threaded hole (121) and a pin hole (122), the lower surface of the base (201) of the second main shaft neck positioning block (22) is provided with a positioning pin that matches the pin hole (122), the lower surface of the base (201) is provided with a connecting hole corresponding to the threaded hole (121), the connecting hole is a through hole, a threaded rod (221) is passed through the connecting hole, and the base (201) and the base plate (1) can be screwed together and fixed by the threaded rod (221) that is passed through the connecting hole and is threadedly connected to the threaded hole (121); A slide groove (11) is provided on the upper surface of the base plate (1) on the right side of the first and second main journal positioning blocks along the front-back direction, and a slider is provided at the bottom end of the connecting seat (31) of the connecting rod neck limiting block (3), and the slider is slidably connected to the slide groove (11); the upper end of the slider is fixedly connected to a fastening screw (33), the fastening screw (33) is passed through the connecting seat (31), and the upper end of the fastening screw (33) protrudes from the upper surface of the connecting seat (31) and is threadedly connected to a fastening nut (34).

7. A method for detecting an automobile crankshaft, based on the automobile crankshaft detection device according to any one of claims 1 to 6, comprising the following steps: Place the crankshaft on the automobile crankshaft detection device; Rotate the crankshaft and secure it; Measure the height of the crankshaft part to be tested; Determine whether the test results are qualified.

8. The automobile crankshaft detection method according to claim 7, characterized in that: Placing the crankshaft on the automobile crankshaft detection device includes: Place the J1 main journal (1') of the crankshaft in the V-shaped groove (203) of the first main journal positioning block (21), place the J4 main journal (2') of the crankshaft in the V-shaped groove (203) of the second main journal positioning block (22), and fine-tune the crankshaft so that the center of the V-shaped groove (203) is as close as possible to the middle position of the two main journals; The rotating crankshaft and fixing include: Rotate the crankshaft clockwise until the P1 connecting rod neck (3') stops at the connecting rod neck stopper (3) and secure it; The height value of the crankshaft to be measured portion is measured, Using a height measuring device to measure the height H3 of the top of the P3 connecting rod neck (5'), H3 being the vertical distance from the top of the P3 connecting rod neck (5') to the bottom surface of the base plate (1); The determination of whether the test result is qualified includes: Compare H3 with the preset first standard height H0 and calculate the first height difference N, N=|H3-H0|, and compare N with the preset first height difference limit N'. If N≤N', the test result is qualified. If N>N', the test result is unqualified.

9. The automobile crankshaft detection method according to claim 8, characterized in that: The height value of the crankshaft to be measured part is also measured. Using a height measuring device to measure the height H5 of the W5 balancing block (6') and the height H6 of the W6 balancing block (7'), H5 and H6 being the vertical distances from the top of the W5 balancing block (6') and the top of the W6 balancing block (7') to the bottom surface of the base plate (1); The determination of whether the test result is qualified also includes: Compare H5 with the preset second standard height H50 and calculate the second height difference N2, N2=|H5-H50|, and compare N2 with the preset second height difference limit N2'. If N2≤N2', the test result is qualified. If N2>N2', the test result is unqualified; Compare H6 with the preset third standard height H60 and calculate the third height difference N3, N3=|H6-H60|, and compare N3 with the preset third height difference limit N3'. If N3≤N3', the test result is qualified. If N3>N3', the test result is unqualified.

10. The automobile crankshaft detection method according to claim 8, characterized in that: After measuring the height value of the crankshaft to be measured portion, the method further includes the following steps: Calculate the torsion angle of the P3 connecting rod neck (5'); The calculation method of the torsion angle of the P3 connecting rod neck (5') is as follows, Where: N is the first height difference, B is the torsion angle, and R is the distance from the center of the main journal to the center of the P3 connecting rod journal (5').

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