A bearing hole coaxial degree testing fixture

Abstract

The application provides a bearing hole coaxiality gauge, which comprises a core rod, a first detection head arranged at one end of the core rod, and a second detection head arranged at the other end of the core rod in a sliding mode, wherein the first detection head and the second detection head are both cylindrical structural members and have the same diameter; the first detection head and the second detection head are coaxially arranged with the core rod, the core rod is a regular polygonal prism structural member, and the second detection head is provided with an assembly hole in sliding cooperation with the core rod. The bearing hole coaxiality gauge has the advantages of simple structure, stability and reliability, easy use and operation, and can be applied to the coaxiality detection of bearing holes with various interval lengths, has high applicability, and is favorable for improving the coaxiality detection efficiency and detection precision of multiple bearing holes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coaxiality measurement, in particular to a bearing hole coaxiality gauge. BACKGROUND

[0002] Coaxiality is a positioning tolerance, and the correct position in theory is the reference axis. Since the different points of the measured axis to the reference axis may appear in all directions in space, its tolerance zone is a cylinder with the reference axis as the axis, and the tolerance value is the diameter of the cylinder, and a symbol "Φ" is added before the tolerance value. Among them, the camshaft frame in the diesel engine is a key part of the diesel engine, and the existing diesel engine has a double-row integral settlement type sleeve hole lengthened structure camshaft frame. The wall of this camshaft frame structure is thin, the clamping deformation is large, the camshaft hole distance changes, the shape and position tolerance detection elements are many, the three-coordinate measurement is difficult, the data is distorted, the parts need to be sent for inspection many times to verify the authenticity of the data, the detection efficiency is extremely low, and it is not suitable for product batch production after index detection.

[0003] The existing detection method generally uses the dial gauge and the inner diameter micrometer to detect, and uses the three-coordinate to detect the shape and position tolerance, the detection elements are many, the reference is short, the three-coordinate measurement is difficult, the data is distorted, the parts need to be sent for inspection many times to verify the authenticity of the data, the detection efficiency is extremely low, and it is not suitable for product batch production after index detection. The use of coaxiality gauge can improve the detection efficiency, but the existing coaxiality gauge cannot be well adapted due to the length factor. If the length of the coaxiality gauge is simply increased, the excessively long coaxiality gauge will not only have certain errors due to its own gravity during use, resulting in reduced detection accuracy, but also is inconvenient to assemble, which is not conducive to improving the detection efficiency. SUMMARY

[0004] Therefore, the present application aims to provide a bearing hole coaxiality gauge to solve the problem of poor detection efficiency when the existing coaxiality gauge is applied to the detection of the shaft hole of the lengthened structure camshaft frame.

[0005] To achieve the above-mentioned purposes, the technical scheme of the present application is as follows:

[0006] A bearing hole coaxiality gauge, comprising a core rod, a first detection head arranged at one end of the core rod, and a second detection head slidingly arranged at the other end of the core rod, the first detection head and the second detection head are both cylindrical structural members, and the diameters of the two are the same; the first detection head and the second detection head are coaxially arranged with the core rod, the core rod is a regular polygonal prism structure member, and the second detection head is provided with an assembly hole slidingly matched with the core rod.

[0007] Further, the core rod is provided with a detachable connecting rod, one end of the connecting rod is provided with a connecting groove matched with the core rod, the other end is provided with a receiving groove, and the inner diameter of the receiving groove is greater than the outer diameter of the core rod.

[0008] Further, the connecting rod is provided with an insertion block at a position around the accommodating groove, and the second detection head is provided with an insertion slot capable of cooperating with the insertion block.

[0009] Further, the insertion blocks are uniformly arranged at least two around the accommodating groove, and the insertion slots are arranged one by one corresponding to the insertion blocks.

[0010] Further, the connecting rod is provided with an anti-skid pattern or an anti-skid sleeve.

[0011] Further, the first detection head and the second detection head are both provided with a chamfer at the left and right ends.

[0012] Further, the first detection head is provided with a guide head at one end of the core rod, one end of the guide head is arranged on the first detection head, and the other end is provided with a tapered end.

[0013] Further, the guide head is provided with a through hole for installing a pull rope.

[0014] Compared with the prior art, the bearing hole coaxiality gauge has the following advantages:

[0015] The application provides a bearing hole coaxiality gauge, which has the advantages of simple structure, stability and reliability, easy use and operation, and can be applied to coaxiality detection of bearing holes with various interval lengths, has high applicability, and is favorable for improving the coaxiality detection efficiency and detection precision of multiple bearing holes. By arranging the first detection head and the second detection head on the core rod, the first detection head and the second detection head are alternately passed through each bearing hole, so that the coaxiality of the bearing holes in the camshaft frame of the lengthened structure can be measured, and the operation is more convenient. By arranging the detachable connecting rod on the core rod, the operator can move the first detection head or the second detection head by using the connecting rod according to actual needs, which further improves the convenience of using the coaxiality gauge and is favorable for further improving the detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the application are used to provide a further understanding of the application, the schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0017] Figure 1 FIG. 1 is a structural schematic view of a bearing hole coaxiality gauge according to an embodiment of the application;

[0018] Figure 2 FIG. 2 is a sectional view of the bearing hole coaxiality gauge according to the embodiment of the application; Figure 1

[0019] Figure 3 ​A structure schematic view of one side of a second detection head slot in a bearing hole coaxial degree gauge according to the embodiment of the present application;

[0020] Figure 4 A structure schematic view of one side of a connecting rod accommodating slot in a bearing hole coaxial degree gauge according to the embodiment of the present application;

[0021] Figure 5 A structure schematic view of a double-row integral settlement type sleeve hole lengthened camshaft frame in a bearing hole coaxial degree gauge according to the embodiment of the present application;

[0022] Figure 6 A structure schematic view of a structure in the A direction; Figure 5 A structure schematic view of a structure in the B-B direction;

[0023] Figure 7 A structure schematic view of a structure in the B-B direction; Figure 5 A structure schematic view of a structure in the B-B direction;

[0024] Mark explanation:

[0025] 1, first detection head; 2, second detection head; 3, core rod; 4, guide head; 5, through hole; 6, plug; 7, connecting rod; 8, anti-skid sleeve; 9, connecting slot; 10, accommodating slot; 11, slot; 12, assembly hole. Specific implementation

[0026] The present application will be further described in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all structures.

[0027] A bearing hole coaxial degree gauge, as shown in Figures 1 to 7 The first detection head 1 and the second detection head 2 are both cylindrical structural members, and the diameters of the two are the same; the first detection head 1 and the second detection head 2 are coaxially arranged with the core rod 3, the core rod 3 is a regular polygonal prism structure, and the second detection head 2 is provided with an assembly hole 12 which is in sliding fit with the core rod 3.

[0028] For example, the core rod 3 can be a regular triangular prism, a regular quadrangular prism or other regular polygonal prism, and the corresponding assembly hole 12 is also a regular triangle, a square or other shape. Those skilled in the art can also select a suitable shape of the core rod 3 and the assembly hole 12 according to actual needs to realize the sliding fit between the core rod 3 and the assembly hole 12, and then realize the sliding of the second detection head 2 on the core rod 3. Here, it is not repeated.

[0029] In practical application, the first detection head 1 can be fixed on the core rod 3, and the diameters of the first detection head 1 and the second detection head 2 need to match the bearing hole to be detected, so as to realize the coaxiality detection of various bearing holes. The skilled in the art can select or design according to the diameter of the actual bearing hole, which will not be described here. Specifically, the length of the core rod 3 can be set according to the spacing of the bearing holes on the camshaft frame of the lengthened structure, and the length of the core rod 3 needs to be greater than the spacing between the adjacent two bearing holes, so as to realize the cooperation of the first detection head 1 and the second detection head 2 with the adjacent two bearing holes, and then realize the coaxiality detection. In addition, by sliding the second detection head 2 on the core rod 3, the gap between the second detection head 2 and the first detection head 1 is adjustable, so that the second detection head 2 and the first detection head 1 can realize the coaxiality detection of various spacing bearing holes, and the applicability and universality of the coaxiality gauge are improved.

[0030] Optionally, the core rod 3 is provided with a detachable connecting rod 7, one end of the connecting rod 7 is provided with a connecting groove 9 capable of cooperating with the core rod 3, and the other end is provided with a receiving groove 10, the inner diameter of the receiving groove 10 is greater than the outer diameter of the core rod 3, so as to facilitate the rotation of the connecting rod 7 relative to the core rod 3. Exemplarily, the cross section of the receiving groove 10 is circular, and the diameter is greater than the outer diameter of the cross section of the core rod 3, so that when the connecting groove 9 on the connecting rod 7 cooperates with the core rod 3, the connecting rod 7 can drive the core rod 3 to rotate, and then drive the first detection head 1 to rotate into the bearing hole to realize detection, which is more convenient to operate. When the receiving groove 10 on the connecting rod 7 cooperates with the core rod 3, the operator can use the connecting rod 7 to push the second detection head 2 into the bearing hole, so as to replace the cooperation of the first detection head 1 with the current bearing hole, thereby facilitating the subsequent detection of the next bearing hole by the first detection head 1.

[0031] In practical application, the connecting rod 7 is provided with an insertion block 6 around the position corresponding to the receiving groove 10, and the second detection head 2 is provided with an insertion groove 11 capable of cooperating with the insertion block 6. Exemplarily, the insertion block 6 is fixed on the connecting rod 7, and through the cooperation of the insertion block 6 and the insertion groove 11, when the receiving groove 10 on the connecting rod 7 cooperates with the core rod 3, the operator can also use the connecting rod 7 to drive the second detection head 2 to rotate into the bearing hole, which reduces the operation difficulty of the second detection head 2.

[0032] Optionally, the insertion block 6 is arranged circumferentially at least uniformly in two, and the insertion slot 11 is arranged one-to-one with the insertion block 6. For example, the insertion block 6 can be arranged uniformly in two, three or more. By arranging at least two insertion blocks 6, the stability of the connecting rod 7 and the connecting portion of the second detection head 2 when the accommodating groove 10 is matched with the mandrel 3 is improved, and the operator can push the second detection head 2 into the bearing hole by using the connecting rod 7. In actual use, in order to facilitate the matching of the connecting rod 7 with the mandrel 3 or the second connecting head, a tapered end facilitating insertion can be arranged on the mandrel 3 and the insertion block 6, and an arc surface facilitating insertion can be arranged on the connecting rod 7 corresponding to the position of the insertion slot 9 and the accommodating groove 10, so as to facilitate the operator to assemble the connecting rod 7.

[0033] In addition, the diameter of the connecting rod 7 can match or be slightly smaller than the diameter of the bearing hole, so that the connecting rod 7 can be quickly aligned with the mandrel 3 after being inserted into the bearing hole, and the connection between the connecting rod 7 and the first detection head 1 is realized. The length of the insertion slot 11 on the second detection head 2 can also be greater than the length of the insertion block 6, and can be an arc-shaped slot. By increasing the length of the insertion slot 11, the insertion block 6 can be more conveniently inserted into the insertion slot 11, and the connection between the connecting rod 7 and the second detection head 2 is realized. Those skilled in the art can also select appropriate structures according to actual needs to realize the convenient assembly of the connecting rod 7.

[0034] Optionally, the connecting rod 7 is provided with an anti-skid pattern or an anti-skid sleeve 8. For example, the connecting rod 7 is provided with an anti-skid sleeve 8. The anti-skid sleeve 8 can be a rubber sleeve with an anti-skid texture on the surface. The anti-skid sleeve 8 can be fixed on the connecting rod 7 by adhesive. Those skilled in the art can also select appropriate anti-skid sleeves 8 and their installation methods according to actual needs, which will not be described here. By arranging the anti-skid sleeve 8 or the anti-skid pattern on the connecting rod 7, the operator can rotate the first detection head 1 or the second detection head 2 into the bearing hole by using the connecting rod 7.

[0035] In actual application, the diameter of the anti-skid sleeve 8 can be greater than the diameter of the connecting rod 7, so as to limit the connecting rod 7 to a certain extent, preventing the second detection head 2 from separating from the mandrel 3 during the movement of the connecting rod 7 driving the first detection head 1. In addition, the diameter of the anti-skid sleeve 8 can be smaller than the diameter of the connecting rod 7, so as to facilitate the connecting rod 7 to extend into the bearing hole. Those skilled in the art can select according to actual needs to realize the movement of the first detection head 1 or the second detection head 2 by using the connecting rod 7. The anti-skid pattern is the same, which will not be described here.

[0036] Optionally, the left and right ends of the first detection head 1 and the left and right ends of the second detection head 2 are provided with chamfers. By arranging chamfers on the first detection head 1 and the second detection head 2, the first detection head 1 and the second detection head 2 can be inserted into the bearing hole.

[0037] Optionally, the first detection head 1 is provided with a guide head 4 at one end of the mandrel 3, one end of the guide head 4 is arranged on the first detection head 1, and the other end is provided with a tapered end. Illustratively, the guide head 4 is fixed on the first detection head 1, and the diameter of the guide head 4 is smaller than the diameter of the first detection head 1, and the guide head 4 is provided with a through hole 5 for installing a pull rope. By arranging the guide head 4 with a tapered end on the first detection head 1, the convenience of inserting the first detection head 1 into the bearing hole can be further improved. In addition, the connection between the guide head 4 and the first detection head 1 can be smoothly transitioned, and the through hole 5 on the guide head 4 can also be used to install a pull rope, so that the first detection head 1 can be quickly inserted through each bearing hole under the combined action of the pull rope and the connecting rod 7, which is beneficial to further improve the bearing hole coaxiality detection efficiency.

[0038] In actual application, the coaxiality gauge can be used for coaxiality detection by the following steps:

[0039] Step one, clean the first detection head and the mandrel, and install the second detection head on the mandrel, and if necessary, apply lubricating oil.

[0040] Step two, insert the first detection head into the first bearing hole on one side of the camshaft frame with an extended structure.

[0041] Step three, push the second detection head, use the second detection head to push the first detection head out of the first bearing hole, and insert the second detection head into the first bearing hole.

[0042] Step four, use the connecting groove on the connecting rod to cooperate with the mandrel on the first detection head, and then the operator can use the connecting rod to drive the mandrel and the first detection head to rotate and move, so that the first detection head can enter the next bearing hole, and the coaxiality detection of the two bearing holes is completed.

[0043] Step five, after the connecting rod is pulled out, turn over or replace another connecting rod, use the accommodating groove on the connecting rod to cooperate with the mandrel, and insert the plug on the connecting rod into the slot on the second detection head, then the operator can use the connecting rod to drive the second detection head to rotate and move, so that the second detection head can be inserted into the next bearing hole under the guidance of the mandrel, and the first detection head can be pushed out of the next bearing hole.

[0044] Step six, repeat steps four to five until the first detection head moves to the last bearing hole on the other side of the camshaft frame with an extended structure, and the coaxiality detection of each bearing hole is completed, which represents that the coaxiality of each bearing hole meets the design requirements, and if the first detection head cannot pass through the bearing hole, it indicates that there is an error in the coaxiality of the current bearing hole and the previous bearing hole.

[0045] In addition, the connecting rod can be long or short, and those skilled in the art can select a connecting rod with a suitable length according to actual needs. For example, when there is a gap in the camshaft frame of the elongated structure, the operator can also use a shorter connecting rod, at which time the mandrel can be directly used to drive the first detection head to move, and the connecting rod can be used to extend into the gap and cooperate with the second connecting head, so that the connecting rod is only used to drive the second detection head to move, and the operation is more convenient. The operator can select and adjust according to actual needs, and here will not be repeated.

[0046] The application provides a bearing hole coaxiality gauge, which has the advantages of simple structure, stability and reliability, easy use and operation, and can be applied to coaxiality detection of bearing holes with various interval lengths, has high applicability, and is favorable for improving coaxiality detection efficiency and detection precision of multiple bearing holes. By arranging the first detection head and the second detection head on the mandrel, the first detection head and the second detection head are used to alternately pass through each bearing hole, so that the coaxiality of the bearing holes in the camshaft frame of the elongated structure can be measured, and the operation is more convenient. By arranging the detachable connecting rod on the mandrel, the operator can use the connecting rod to push the first detection head or the second detection head to move according to actual needs, the convenience of using the coaxiality gauge is further improved, and the detection efficiency is further improved.

[0047] The above only describes preferred embodiments of the application and is not used to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A bearing hole coaxiality inspection tool, characterized by: The invention comprises a core rod (3), a first detection head (1) arranged at one end of the core rod (3), and a second detection head (2) slidably arranged at the other end of the core rod (3), wherein the first detection head (1) and the second detection head (2) are both cylindrical structural parts and have the same diameter; the first detection head (1) and the second detection head (2) are both coaxially arranged with the core rod (3), the core rod (3) is a regular polygonal structural part, and the second detection head (2) is provided with an assembly hole (12) that slidably cooperates with the core rod (3); a detachable connecting rod (7) is provided on the core rod (3), one end of the connecting rod (7) is provided with a connecting groove (9) that can cooperate with the core rod (3), and the other end is provided with a receiving groove (10), the inner diameter of the receiving groove (10) is larger than the outer diameter of the core rod (3); the connecting rod (7) is provided with an insert (6) at positions around the corresponding receiving groove (10), and the second detection head (2) is provided with a slot (11) that can cooperate with the insert (6).

2. A bearing hole coaxiality inspection tool according to claim 1, characterized in that: At least two inserting blocks (6) are evenly arranged along the circumference of the accommodating groove (10), and the slots (11) are arranged in a one-to-one correspondence with the inserting blocks (6).

3. The bearing hole coaxiality inspection tool according to claim 1, characterized in that: The connecting rod (7) is provided with anti-slip patterns or an anti-slip sleeve (8).

4. A bearing hole coaxiality inspection tool according to any one of claims 2-3, characterized in that: Both left and right ends of the first detection head (1) and left and right ends of the second detection head (2) are provided with chamfers.

5. A bearing hole coaxiality inspection tool according to any one of claims 2-3, characterized in that: A guide head (4) is provided at one end of the first detection head (1) that is different from the core rod (3); one end of the guide head (4) is arranged on the first detection head (1), and the other end is provided with a cone end.

6. A bearing hole coaxiality inspection tool according to claim 5, characterized in that: The guide head (4) is provided with a through hole (5) for installing a draw rope.

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