Crankshaft anti-rotation device

Abstract

The utility model discloses an anti-rotation device for a crankshaft. Belongs to the technical field of crankshaft testing, the crankshaft anti-rotation device is used for belt pulley bolt tightening testing of a crankshaft, the crankshaft anti-rotation device comprises a fixed block and a plurality of anti-rotation bolts, each anti-rotation bolt is fixedly connected with the fixed block, and the plurality of anti-rotation bolts are suitable for being inserted into a plurality of flywheel mounting holes in the rear end of the crankshaft to limit rotation of the crankshaft. In a belt pulley bolt tightening test process, the crankshaft can be prevented from rotating to influence a test result, so that the accuracy of the belt pulley bolt tightening test can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft testing, and more specifically, to a crankshaft anti-rotation device. Background Art

[0002] In order to ensure the stability and reliability of the connection between the crankshaft and the pulley, it is usually necessary to perform a tightening test on the pulley bolts connecting the crankshaft and the pulley to detect the tightening torque and axial force of the pulley bolts.

[0003] In the related art, when performing the tightening test on the pulley bolts, a fixed pressing block is usually used to press against the crankshaft in the axial direction of the crankshaft to fix the crankshaft, which easily causes problems such as crankshaft rotation and unstable pressing, resulting in abnormal test curves, affecting the accuracy of the test results. Moreover, after an abnormality occurs, the pulley bolts cannot be tightened and tested a second time, resulting in a high cost for the tightening test. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the above technical problems in the prior art to some extent. For this reason, the utility model provides a crankshaft anti-rotation device, which can prevent the crankshaft from rotating and is beneficial to improving the accuracy of the tightening test of the pulley bolts.

[0005] According to an embodiment of the utility model, the crankshaft anti-rotation device is used for the tightening test of the pulley bolts of the crankshaft. The crankshaft anti-rotation device includes: a fixed block and a plurality of anti-rotation pins. Each anti-rotation pin is fixedly connected to the fixed block, and the plurality of anti-rotation pins are adapted to be inserted into a plurality of flywheel mounting holes at the rear end of the crankshaft to limit the rotation of the crankshaft.

[0006] According to an embodiment of the utility model, the plurality of anti-rotation pins of the crankshaft anti-rotation device are adapted to be inserted into a plurality of flywheel mounting holes at the rear end of the crankshaft to limit the rotation of the crankshaft. During the tightening test of the pulley bolts, the rotation of the crankshaft can be avoided from affecting the test results, thereby being beneficial to improving the accuracy of the tightening test of the pulley bolts.

[0007] According to some embodiments of the utility model, the fixed block includes: a connecting portion and a fixing portion. The connecting portion has a first connecting surface and a second connecting surface facing in opposite directions. The plurality of anti-rotation pins are fixedly connected to the first connecting surface, and the fixing portion is fixedly connected to the second connecting surface. The fixing portion is adapted to be clamped and fixed by a bench vice.

[0008] According to some embodiments of the utility model, the fixing portion has a plurality of clamping surfaces parallel to the axial direction of the crankshaft, and at least two of the clamping surfaces are parallel.

[0009] According to some embodiments of the utility model, the first connecting surface is adapted to abut against the rear end of the crankshaft in the axial direction of the crankshaft.

[0010] According to some embodiments of the present utility model, a plurality of the anti-rotation pins are adapted to correspond to a plurality of the flywheel mounting holes one by one, and each of the anti-rotation pins is adapted to be inserted into a corresponding one of the flywheel mounting holes.

[0011] According to some embodiments of the present utility model, in the axial direction of the crankshaft, the length of the anti-rotation pin is greater than or equal to the depth of the flywheel mounting hole.

[0012] According to some embodiments of the present utility model, the diameter of the anti-rotation pin is equal to the inner diameter of the flywheel mounting hole.

[0013] According to some embodiments of the present utility model, the anti-rotation pin includes a first limiting section and a second limiting section. The first limiting section is connected between the second limiting section and the fixing block. The first limiting section is adapted to be inserted into the flywheel mounting hole, and at least a part of the second limiting section is located outside the flywheel mounting hole. The crankshaft anti-rotation device further includes: a locking member, which is detachably connected to the second limiting section. In the radial direction of the flywheel mounting hole, the maximum dimension of the locking member is greater than the inner diameter of the flywheel mounting hole.

[0014] According to some embodiments of the present utility model, a plurality of anti-rotation pins are integrally formed with the fixing block.

[0015] According to some embodiments of the present utility model, a plurality of anti-rotation pins are detachably connected to the fixing block.

[0016] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0017] Figure 1 is a three-dimensional view of the crankshaft anti-rotation device according to an embodiment of the present utility model Figure 1 ;

[0018] Figure 2 is a three-dimensional view of the crankshaft anti-rotation device according to an embodiment of the present utility model Figure 2 ;

[0019] Figure 3 is a schematic view of the crankshaft anti-rotation device, the crankshaft and the pulley bolt before the pulley bolt tightening test according to an embodiment of the present utility model;

[0020] Figure 4 is a schematic view of the crankshaft anti-rotation device, the crankshaft and the pulley bolt during the pulley bolt tightening test according to an embodiment of the present utility model.

[0021] Reference Signs:

[0022] Fixed block 1; connecting portion 11; first connecting surface 111; second connecting surface 112; fixing portion 12; clamping surface 121;

[0023] Anti-rotation pin 2;

[0024] Crankshaft anti-rotation device 10; crankshaft 20; flywheel mounting hole 201; pulley bolt 30. Specific embodiments

[0025] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 thus should not be construed as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following will be combined with Figures 1 - 4 Describe in detail the crankshaft anti-rotation device 10 according to the embodiments of the present invention.

[0030] Refer to Figures 1 - 4As shown in the figure, the crankshaft anti-rotation device 10 according to the embodiment of the present invention is used for the tightening test of the pulley bolt 30 of the crankshaft 20. The crankshaft anti-rotation device 10 includes: a fixed block 1 and a plurality of anti-rotation pins 2. Each anti-rotation pin 2 is fixedly connected to the fixed block 1. The plurality of anti-rotation pins 2 are adapted to be inserted into a plurality of flywheel mounting holes 201 at the rear end of the crankshaft 20 to limit the rotation of the crankshaft 20, avoid the rotation of the crankshaft 20 during the tightening test of the pulley bolt 30, and facilitate the tightening test of the pulley bolt 30.

[0031] Specifically, before the tightening test of the pulley bolt 30 of the crankshaft 20, the fixed block 1 of the crankshaft anti-rotation device 10 can be fixed on the test bench first, and then a plurality of anti-rotation pins 2 are inserted into a plurality of flywheel mounting holes 201 at the rear end of the crankshaft 20 to position the crankshaft 20. Subsequently, a tightening machine can be used to tighten the pulley bolt 30 and detect the tightening torque of the pulley bolt 30. At the same time, an ultrasonic axial force measuring instrument can also be used to detect the axial force of the pulley bolt 30 to perform the tightening test on the pulley bolt 30.

[0032] It can be understood that when the pulley bolt 30 is tightened, the tightening torque applied to the pulley bolt 30 can be transmitted to the crankshaft 20, and the crankshaft 20 has a tendency to rotate. By inserting a plurality of anti-rotation pins 2 into a plurality of flywheel mounting holes 201 at the rear end of the crankshaft 20, the plurality of anti-rotation pins 2 can form multiple groups of limiting fits with the plurality of flywheel mounting holes 201 to limit the crankshaft 20, effectively avoiding the rotation of the crankshaft 20 under the action of the tightening torque, preventing the rotation of the crankshaft 20 from affecting the test results, and avoiding abnormalities in the tightening test, thereby facilitating ensuring the accuracy of the tightening test of the pulley bolt 30 and reducing the cost of the tightening test of the pulley bolt 30.

[0033] Among them, the number of anti-rotation pins 2 is two or more. The anti-rotation pins 2 can be configured as a cylindrical structure. The flywheel mounting holes 201 are adapted to mount the flywheel. When the crankshaft anti-rotation device 10 is in use, the flywheel mounting holes 201 are borrowed to make full use of the existing structure of the crankshaft 20 without modifying the crankshaft 20.

[0034] For the crankshaft anti-rotation device 10 according to the embodiment of the present invention, its plurality of anti-rotation pins 2 are adapted to be inserted into a plurality of flywheel mounting holes 201 at the rear end of the crankshaft 20 to limit the rotation of the crankshaft 20. During the tightening test of the pulley bolt 30, the rotation of the crankshaft 20 can be avoided from affecting the test results, thereby facilitating improving the accuracy of the tightening test of the pulley bolt 30.

[0035] In some embodiments of the present invention, refer to Figure 1 and Figure 2As shown, the fixing block 1 includes a connecting portion 11 and a fixing portion 12. The connecting portion 11 has a first connecting surface 111 and a second connecting surface 112 facing in opposite directions. A plurality of anti-rotation pins 2 are fixedly connected to the first connecting surface 111, and the fixing portion 12 is fixedly connected to the second connecting surface 112. The fixing portion 12 is adapted to be clamped and fixed by a vise so as to fix the position of the crankshaft anti-rotation device 10.

[0036] It can be understood that by clamping and fixing the fixing portion 12 with a vise to fix the crankshaft anti-rotation device 10, the connecting portion 11 can be avoided from being subjected to the clamping force, so as to reduce the risk of deformation of the connecting portion 11 due to force, which is beneficial to ensuring the position accuracy of the plurality of anti-rotation pins 2 on the first connecting surface 111, and thus beneficial to ensuring the position accuracy of the crankshaft 20. In addition, the fixing portion 12 is connected to the second connecting surface 112, and the anti-rotation pins 2 are connected to the first connecting surface 111. The fixing portion 12 faces away from the anti-rotation pins 2. When the vise clamps the fixing portion 12, the risk of interference between the crankshaft 20 and the anti-rotation pins 2 and the vise can be reduced, so as to facilitate the vise to clamp the fixing portion 12.

[0037] Refer to Figure 1 and Figure 2 As shown, the orthographic projection of the fixing portion 12 on the connecting portion 11 is located within the connecting portion 11. The maximum dimension of the connecting portion 11 can be larger than the maximum dimension of the fixing portion 12. The larger size of the connecting portion 11 is convenient for arranging a plurality of anti-rotation pins 2 on the first connecting surface 111 of the connecting portion 11, and the smaller size of the fixing portion 12 is convenient for the vise to clamp the fixing portion 12.

[0038] In some embodiments of the present invention, refer to Figure 2 As shown, the fixing portion 12 has a plurality of clamping surfaces 121 parallel to the axial direction of the crankshaft 20, and at least two clamping surfaces 121 are parallel, so as to facilitate the vise to clamp the fixing portion 12 through the two parallel clamping surfaces 121. For example, the fixing portion 12 is a hexagonal head structure, and the fixing portion 12 has three pairs of parallel clamping surfaces 121. The vise can clamp the fixing portion 12 through any pair of parallel clamping surfaces 121.

[0039] It can be understood that the vise may have a fixed jaw and a movable jaw arranged in parallel. The fixed jaw and the movable jaw are adapted to jointly clamp the fixing portion 12. When the fixed jaw and the movable jaw clamp the fixing portion 12, the fixed jaw and the movable jaw arranged in parallel can be fully attached to the two parallel clamping surfaces 121 respectively, which is beneficial to increasing the contact area between the vise and the fixing portion 12, and thus beneficial to improving the stability and reliability of the vise clamping the fixing portion 12.

[0040] In some embodiments of the present invention, refer to Figure 3 and 4 As shown, the first connecting surface 111 is adapted to be in the axial direction of the crankshaft 20 (i.e., Figure 3 andFigure 4 in the up - down direction) abuts against the rear end of the crankshaft 20. The first connecting surface 111 is adapted to support and position the crankshaft 20 to limit the movement of the crankshaft 20 in its axial direction during the tightening test of the pulley bolt 30, which is beneficial to improving the accuracy of the tightening test of the pulley bolt 30.

[0041] In some embodiments of the present utility model, a plurality of anti - rotation pins 2 are adapted to correspond to a plurality of flywheel mounting holes 201 one by one. Each anti - rotation pin 2 is adapted to be inserted into the corresponding flywheel mounting hole 201. That is to say, each flywheel mounting hole 201 is inserted with a corresponding anti - rotation pin 2. The plurality of anti - rotation pins 2 and the plurality of corresponding flywheel mounting holes 201 can form multiple groups of limiting fits, which can effectively prevent the crankshaft 20 from rotating during the tightening test of the pulley bolt 30, and is beneficial to ensuring the accuracy of the tightening test of the pulley bolt 30.

[0042] In some embodiments of the present utility model, in the axial direction of the crankshaft 20, the length of the anti - rotation pin 2 is greater than or equal to the depth of the flywheel mounting hole 201, so as to increase the contact area between the anti - rotation pin 2 and the flywheel mounting hole 201, which is beneficial to improving the reliability of restricting the rotation of the crankshaft 20, and can also prevent the crankshaft 20 from tilting axially during the tightening test, preventing abnormal tightening tests.

[0043] In some embodiments of the present utility model, the diameter of the anti - rotation pin 2 is equal to the inner diameter of the flywheel mounting hole 201. After the anti - rotation pin 2 is inserted into the flywheel mounting hole 201, the outer side wall of the anti - rotation pin 2 can be attached to the inner side wall of the flywheel mounting hole 201, which can effectively prevent the crankshaft 20 from shaking, realizing the precise positioning of the crankshaft 20, so as to facilitate the tightening test of the pulley bolt 30.

[0044] In some embodiments of the present utility model, the anti - rotation pin 2 includes a first limiting section and a second limiting section. The first limiting section is connected between the second limiting section and the fixing block 1. The first limiting section is adapted to be inserted into the flywheel mounting hole 201. At least part of the second limiting section is located outside the flywheel mounting hole 201. The crankshaft anti - rotation device 10 further includes: a locking member, which is detachably connected to the second limiting section. In the radial direction of the flywheel mounting hole 201, the maximum dimension of the locking member is greater than the inner diameter of the flywheel mounting hole 201. During the tightening test of the pulley bolt 30, the locking member can prevent the crankshaft 20 from moving in the axial direction, which is beneficial to improving the accuracy of the tightening test of the pulley bolt 30. Among them, the second limiting section can be processed with threads, and the locking member can be a nut.

[0045] It can be understood that before the pulley bolt 30 is tightened for testing, the anti-rotation pin 2 can be inserted into the flywheel mounting hole 201 at the rear end of the crankshaft 20 first, and then the locking member is installed on the second limiting section. In the axial direction of the crankshaft 20, the locking member and the first connection surface 111 of the connecting portion 11 can jointly clamp the rear end of the crankshaft 20 to axially limit the crankshaft 20 and prevent the crankshaft 20 from moving in its axial direction, so as to facilitate the tightening test of the pulley bolt 30. After the tightening test of the pulley bolt 30 is completed, the locking member can be removed from the second limiting section to facilitate the removal of the crankshaft 20 from the crankshaft anti-rotation device 10.

[0046] In some embodiments of the present utility model, multiple anti-rotation pins 2 and the fixing block 1 are integrally formed. Multiple anti-rotation pins 2 and the fixing block 1 do not need to be connected by fasteners or welded, which is beneficial to simplifying the assembly steps of the multiple anti-rotation pins 2 and the fixing block 1, thereby facilitating the improvement of the production efficiency of the crankshaft anti-rotation device 10. At the same time, it is also beneficial to reduce the number of parts of the crankshaft anti-rotation device 10 and reduce the production cost of the crankshaft anti-rotation device 10. Among them, the multiple anti-rotation pins 2 and the fixing block 1 can be integrally formed by processing methods such as 3D printing and casting.

[0047] In other embodiments of the present utility model, multiple anti-rotation pins 2 and the fixing block 1 are detachably connected. Multiple anti-rotation pins 2 and the fixing block 1 can be formed separately, and the manufacturing difficulty is relatively low, which is beneficial to reducing the manufacturing difficulty of the crankshaft anti-rotation device 10.

[0048] It can be understood that when at least one of the multiple anti-rotation pins 2 is damaged, the corresponding damaged anti-rotation pin 2 can be removed from the fixing block 1, and a new anti-rotation pin 2 can be installed on the fixing block 1 to maintain the crankshaft anti-rotation device 10 by replacing the anti-rotation pin 2, without replacing the entire crankshaft anti-rotation device 10, which is beneficial to reducing the maintenance cost of the crankshaft anti-rotation device 10.

[0049] Among them, the fixing block 1 can be provided with multiple threaded holes, and the anti-rotation pin 2 can be processed with external threads. Screwing the anti-rotation pin 2 into the threaded hole can realize the installation of the anti-rotation pin 2, and screwing the anti-rotation pin 2 out of the threaded hole can realize the disassembly of the anti-rotation pin 2. The disassembly and assembly operations of the anti-rotation pin 2 are simple, which is convenient for the use of the crankshaft anti-rotation device 10.

[0050] In addition, since the anti-rotation pin 2 and the fixing block 1 are detachably connected, the position and quantity of the anti-rotation pins 2 connected to the fixing block 1 can be adjusted to adapt to the position and quantity of the flywheel mounting holes 201 on different specifications of the crankshaft 20, which is beneficial to improving the versatility of the crankshaft anti-rotation device 10.

[0051] In some embodiments of the present utility model, the materials of the plurality of anti-rotation pins 2 and the fixing block 1 can be high-hardness materials such as cast iron and stainless steel, so as to reduce the risk of deformation of the anti-rotation pins 2 and the fixing block 1, thereby being beneficial to improving the reliability of restricting the rotation of the crankshaft 20 and ensuring the position accuracy of the crankshaft 20.

[0052] According to the crankshaft anti-rotation device 10 of the embodiments of the present utility model, the method of using a traditional fixed pressing block to press against the crankshaft 20 for fixing the crankshaft 20 can be avoided. The crankshaft anti-rotation device 10 has a simple structure, is simple and convenient to operate, has a good anti-rotation effect, and can solve problems such as the rotation of the crankshaft 20 and unstable pressing during the tightening test of the pulley bolt 30. The operation convenience, test accuracy, and test cost of the tightening test of the pulley bolt 30 are all lower than those of the traditional method.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0054] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A crankshaft anti-rotation device, used for tightening test of a pulley bolt (30) of a crankshaft (20), characterized in that: The crankshaft anti-rotation device comprises: a fixing block (1) and a plurality of anti-rotation pins (2), each of the anti-rotation pins (2) being fixedly connected to the fixing block (1), the plurality of anti-rotation pins (2) being suitable for being inserted into a plurality of flywheel mounting holes (201) at the rear end of the crankshaft (20) to limit the rotation of the crankshaft (20), the fixing block (1) comprising: a connecting portion (11) and a fixing portion (12), the connecting portion (11) having a first connecting surface (111) and a second connecting surface (112) facing opposite directions, the plurality of anti-rotation pins (2) being fixedly connected to the first connecting surface (111), the fixing portion (12) being fixedly connected to the second connecting surface (112), and the fixing portion (12) being suitable for being clamped and fixed by a vise.

2. The crankshaft anti-rotation device according to claim 1, characterized in that: The fixing portion (12) has a plurality of clamping surfaces (121) parallel to the axial direction of the crankshaft (20), and at least two of the clamping surfaces (121) are parallel.

3. The crankshaft anti-rotation device according to claim 1, characterized in that: The first connecting surface (111) is suitable for abutting against the rear end of the crankshaft (20) in the axial direction of the crankshaft (20).

4. The crankshaft anti-rotation device according to any one of claims 1 to 3, characterized in that: The plurality of anti-rotation pins (2) are suitable for corresponding one-to-one with the plurality of flywheel mounting holes (201), and each of the anti-rotation pins (2) is suitable for being inserted into the corresponding flywheel mounting hole (201).

5. The crankshaft anti-rotation device according to claim 1, characterized in that: In the axial direction of the crankshaft (20), the length of the anti-rotation pin (2) is greater than or equal to the depth of the flywheel mounting hole (201).

6. The crankshaft anti-rotation device according to claim 1, characterized in that: The diameter of the anti-rotation pin (2) is equal to the inner diameter of the flywheel mounting hole (201).

7. The crankshaft anti-rotation device according to claim 1, characterized in that: The anti-rotation latch (2) comprises a first limiting section and a second limiting section, the first limiting section is connected between the second limiting section and the fixing block (1), the first limiting section is suitable for being inserted into the flywheel mounting hole (201), and at least a portion of the second limiting section is located outside the flywheel mounting hole (201); The crankshaft anti-rotation device further comprises: a locking member, which is detachably connected to the second limiting section, and in the radial direction of the flywheel mounting hole (201), the maximum size of the locking member is larger than the inner diameter of the flywheel mounting hole (201).

8. The crankshaft anti-rotation device according to claim 1, characterized in that: A plurality of anti-rotation pins (2) are integrally formed with the fixing block (1).

9. The crankshaft anti-rotation device according to claim 1, characterized in that: A plurality of anti-rotation pins (2) are detachably connected to the fixing block (1).

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