Engine crankshaft rotation angle measuring tool

Abstract

An engine crankshaft rotation angle measuring tool comprises a body, a guide groove penetrating through the two sides of the body is formed in the middle of the body, and a cavity penetrating through the guide groove is formed in the upper portion of the body. The at least two fixing claws are oppositely arranged on the two sides of the body, a positioning groove is formed in one end of each fixing claw, the other end of each fixing claw is connected to the body through a guide groove, and the fixing claws slide in the guide grooves; the seat shaft is arranged in the cavity, the two ends of the seat shaft are connected with fixing claws arranged on the two sides of the body, and limiting bosses are arranged at the two ends of the seat shaft; the elastic piece is arranged in the middle of the seat shaft in a sleeving mode and connected with the limiting bosses at the two ends, and a distance for compressing the elastic piece is arranged in the middle of the seat shaft; and the angle meter is fixed at the bottom of the body. Adsorption connection is replaced by mechanical connection, abnormal sliding of the angle meter is effectively avoided, and measurement precision and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine assembly measurement, in particular to an engine crankshaft angle measurement tool. Background Art

[0002] The crankshaft belongs to the engine valve mechanism, and the crankshaft drives the camshaft through the timing chain. Valve timing is the relationship between the start and end time of the engine intake and exhaust process expressed by the crankshaft rotation angle. Valve timing is an important factor affecting the engine charging efficiency, which directly affects the engine's power and economy. Therefore, the accuracy of valve timing is very high. The initial state of the engine timing is guaranteed by the assembly tooling used during engine assembly. After assembly, the valve timing needs to be measured to confirm whether it is qualified.

[0003] During the trial development stage of the engine, the timing is usually measured using an angle gauge to measure the crankshaft rotation angle. The angle gauge is attached to the flywheel and rotates with the crankshaft. This method has the following defects: Since the flywheel surface has reinforcing ribs and deweighting holes, there is no regular surface, the angle gauge cannot be effectively attached, and the angle gauge often slips during the crankshaft rotation. Slight slippage will lead to angle measurement errors, and large slippage requires a new set of data to be measured, which is inefficient. Utility Model Content

[0004] The purpose of the utility model is to provide an engine crankshaft angle measuring tool, which solves the problem that the angle meter in the existing crankshaft angle measuring method cannot be effectively adsorbed and the angle meter often slides during the crankshaft rotation process.

[0005] The utility model provides the following solutions:

[0006] The utility model describes an engine crankshaft angle measuring tool, comprising a body, a guide groove penetrating through two sides of the body is opened in the middle of the body, and a cavity penetrating through the guide groove is opened in the upper part;

[0007] A fixing claw, at least two of which are arranged opposite to each other on both sides of the body, one end of the fixing claw is provided with a positioning groove, and the other end is connected to the body through the guide groove, and the fixing claw slides in the guide groove;

[0008] A seat shaft, the seat shaft is placed in the cavity, two ends of the seat shaft are connected to the fixing claws arranged on both sides of the body, and two ends of the seat shaft are provided with limiting bosses;

[0009] An elastic member, wherein the elastic member is sleeved in the middle of the seat shaft and connected to the limiting bosses at both ends, and a distance for the elastic member to be compressed is provided in the middle of the seat shaft;

[0010] An angle gauge is fixed to the bottom of the body.

[0011] Preferably, the fixing claw comprises a guide rod and a positioning rod, and the guide rod and the positioning rod are L-shaped;

[0012] The guide rod slides in the guide groove and is connected to the seat shaft;

[0013] The positioning groove is arranged on the positioning rod, and the upper surface of the positioning rod is higher than the upper surface of the body.

[0014] Preferably, a threaded mounting hole is provided at the end of the guide rod; and external threads are provided at both ends of the seat shaft, and the external threads are matched and connected with the threaded mounting hole.

[0015] Preferably, a groove is provided at the bottom of the body, and the angle gauge is placed in the groove and fixed on the body.

[0016] Preferably, mounting holes penetrating the groove are provided on both sides of the body; the measuring tool further comprises a top screw, and an end of the top screw passes through the mounting hole and abuts against the angle gauge.

[0017] Preferably, it further comprises a cover plate; the cover plate is arranged above the cavity.

[0018] Preferably, limiting surfaces are provided on both sides of the cavity, and the cover plate is mounted on the limiting surfaces.

[0019] Preferably, a fixing threaded hole is provided on the upper portion of the limiting surface, and a mounting hole corresponding to the position of the fixing threaded hole is provided on the cover plate.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1. The engine crankshaft angle measuring tool provided by the utility model has an angle meter fixed on the body; a fixing claw is connected to the body, and the tool is clamped on the deweighting hole of the flywheel through the positioning groove on the fixing claw. The flywheel rotates synchronously with the crankshaft, and the angle meter rotates together with the flywheel. The mechanical connection replaces the adsorption connection, which effectively avoids abnormal sliding of the angle meter and improves the measurement accuracy and efficiency.

[0022] 2. The engine crankshaft angle measuring tool provided by the utility model fixes the angle gauge on the main body through a top screw, and the connection is firm.

[0023] 3. The engine crankshaft angle measuring tool provided by the utility model has a positioning groove of the fixed claw corresponding to the position of the deweighting hole on the flywheel when in use, and the resilience of the elastic member enables the tool to be clamped on the flywheel; after the measurement is completed, the elastic member is compressed to move the fixed claw toward the center, the positioning groove is disengaged from the flywheel deweighting hole, and the measuring tool is removed, with a simple structure, simple and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the exterior of the engine crankshaft angle measuring tool according to an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure inside the engine crankshaft angle measurement tool according to an embodiment of the utility model;

[0027] Figure 3 This is a structural cross-sectional view of the engine crankshaft angle measuring tool according to an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the engine crankshaft angle measuring tool body according to an embodiment of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the fixing claw of the engine crankshaft angle measuring tool according to an embodiment of the utility model;

[0030] Figure 6 It is a schematic structural diagram of the engine crankshaft angle measurement tool seat shaft according to an embodiment of the utility model.

[0031] Wherein: 1-body; 11-positioning groove; 12-guide groove; 13-cavity; 14-limiting surface; 141-fixing threaded hole; 15-mounting hole;

[0032] 2-fixing claw; 21-positioning groove; 22-threaded mounting hole; 23-guide rod; 24-positioning rod;

[0033] 3-seat shaft; 33-limiting boss;

[0034] 4- elastic member;

[0035] 5-cover plate;

[0036] 6-top wire;

[0037] 7-Angle table. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0039] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0040] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] 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.

[0042] 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 determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0043] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0044] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0045] See also Figure 1-Figure 5 An engine crankshaft angle measuring tool provided in an embodiment of the present application comprises: a body 1, a guide groove 12 penetrating through both sides of the body 1 is provided in the middle of the body 1, and a cavity 13 penetrating through the guide groove 12 is provided in the upper part; a fixing claw 2, two fixing claws 2 are arranged on both sides of the body 1 relatively, one end of the fixing claw 2 is provided with a positioning groove 21, and the other end is connected to the body 1 through the guide groove 12, and the fixing claw 2 slides in the guide groove 12; a seat shaft 3, the seat shaft 3 is placed in the cavity 13, the two ends of the seat shaft 3 are connected to the fixing claws 2 arranged on both sides of the body 1, and the two ends of the seat shaft 3 are provided with limiting bosses 33; an elastic member 4, the elastic member 4 is sleeved in the middle of the seat shaft 3, and is connected to the limiting bosses 33 at both ends, and a distance for the elastic member 4 to be compressed is provided in the middle of the seat shaft 3; an angle gauge 7, and the angle gauge 7 is fixed to the bottom of the body 1.

[0046] By adopting the above technical solution, the angle meter 7 is fixed on the body 1; the fixing claw 2 is also connected to the body 1 through the guide groove 12, and the tooling is clamped on the flywheel's deweighting hole through the positioning groove 21 on the fixing claw 2. The flywheel is installed on the rear end flange surface of the crankshaft by bolts, and rotates synchronously with the crankshaft. The flywheel drives the angle meter 7 to rotate together, and the angle of the crankshaft can be known by the reading of the angle meter 7. This embodiment uses mechanical connection instead of adsorption connection to effectively avoid abnormal sliding of the angle meter and improve measurement accuracy and efficiency.

[0047] The two ends of the seat shaft 3 are connected to the fixed claws 2 on both sides of the body 1, and are provided with limiting bosses 33 at both ends, and the elastic member 4 is connected to the limiting bosses 33 at both ends. The limiting bosses 33 provide a support force for the elastic member 4 to deform, ensuring the verticality and stability of the elastic member 4, and on the other hand, provide a sliding stop for the fixed claw 2 to prevent the fixed claw 2 from sliding infinitely in the guide groove 12 and thus separating from the body 1.

[0048] The fixed claw 2 can slide in the guide groove 12, and a distance for the elastic member 4 to be compressed is provided in the middle of the seat shaft 3. When using the tooling, external force is applied to the two fixed claws 2 at the same time, so that the elastic member 4 is compressed through the seat shaft 3. At this time, the fixed claw 2 moves toward the center in the guide groove 12, reducing the length of the tooling, so that the tooling can be installed into the deweighting hole of the flywheel, so that the positioning groove 21 of the fixed claw 2 corresponds to the position of the deweighting hole on the flywheel, and then the force applied to the fixed claw 2 is released, and the elastic member 4 generates a rebound force from the center to the outside, which is transmitted back to the fixed claw 2 through the seat shaft 3, so that the tooling is firmly clamped on the flywheel. After the measurement is completed, external force is applied to the two fixed claws 2 again at the same time, and the elastic member 4 is compressed again. The fixed claw 2 moves toward the center in the guide groove 12, reducing the length of the tooling, and the positioning groove 21 is disengaged from the deweighting hole of the flywheel. The measuring tooling is removed, and the structure is simple, the operation is simple and efficient.

[0049] Preferably, the fixing claw includes a guide rod 23 and a positioning rod 24, and the guide rod 23 and the positioning rod 24 are L-shaped; the guide rod 23 slides in the guide groove 12 and is connected to the seat shaft 3; the positioning groove 21 is provided on the positioning rod 24, and the upper surface of the positioning rod 24 is higher than the upper surface of the body 1. The positioning rod 24 provides a limit for the fixing claw 2 to move toward the center, and the upper surface of the positioning rod 24 is set higher than the upper surface of the body 1 so that when the fixing claw 2 is positioned in the deweighting hole of the flywheel, the surface of the body 1 can fit the end face of the flywheel, so that the connection between the tooling and the flywheel is more stable.

[0050] Preferably, the end of the guide rod 23 is provided with a threaded mounting hole 22; both ends of the seat shaft 3 are provided with external threads, and the external threads are matched and connected with the threaded mounting hole 22. The seat shaft 3 and the guide rod 23 are connected together by matching the threaded mounting hole 22 with the external threads.

[0051] In some optional embodiments, a groove 11 is provided at the bottom of the body 1, and the angle gauge 7 is placed in the groove 11 and fixed to the body 1. This solution is a way to fix the angle gauge 7 to the body 1. The groove 11 can reduce the weight of the tooling, and placing the angle gauge 7 in the groove 11 also helps to protect the angle gauge 7. Other methods can also be adopted, for example, the angle gauge 7 is directly bonded to the bottom of the body 1.

[0052] Preferably, mounting holes 15 penetrating the groove 11 are provided on both sides of the body 1; the measuring tool also includes a top screw 6, the end of which passes through the mounting hole 15 and abuts against the angle gauge 7. After the angle gauge 7 is placed in the groove 11, the angle gauge 7 is fixed to the body 1 through the top screw 6 and the mounting hole 15, so as to achieve a stable connection between the angle gauge 7 and the body 1. Compared with directly bonding the angle gauge 7 in the groove 11, in this solution, the angle gauge 7 can be detachably connected to the body 1, and the adhesive can be prevented from solidifying on the angle gauge 7 and being difficult to clean.

[0053] In some optional embodiments, the measuring tool further includes a cover plate 5; the cover plate 5 is arranged above the cavity 13. The cover plate is arranged to prevent dust and impurities from entering the cavity 13.

[0054] Preferably, both sides of the cavity 13 are provided with limiting surfaces 14, and the cover plate 5 is installed on the limiting surfaces 14. The limiting surfaces 14 limit the cover plate 5 so that the cover plate 5 is installed in an accurate position.

[0055] Further preferably, a fixing threaded hole 141 is provided on the upper portion of the limiting surface 14, and a mounting hole corresponding to the position of the fixing threaded hole 141 is provided on the cover plate 5. The cover plate 5 is mounted on the limiting surface 14 through the fixing threaded hole 141 and the mounting hole.

[0056] The working process of the engine crankshaft angle measuring tool described in this embodiment is as follows: external force is applied to the two fixed claws 2 at the same time, so that the elastic member 4 is compressed through the seat shaft 3. At this time, the fixed claws 2 move toward the center in the guide groove 12, reducing the length of the tool, and the tool is installed into the de-weighting hole of the flywheel, so that the positioning groove 21 of the fixed claw 2 corresponds to the position of the de-weighting hole on the flywheel, and then the force applied to the fixed claw 2 is released, and the elastic member 4 generates a rebound force from the center to the outside, firmly clamping the tool on the flywheel. After the measurement is completed, external force is applied to the two fixed claws 2 again at the same time, and the elastic member 4 is compressed again. The fixed claws 2 move toward the center in the guide groove 12, reducing the length of the tool, and the positioning groove 21 is disengaged from the de-weighting hole of the flywheel, and the measuring tool is removed.

[0057] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0058] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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 embodiments of the present application.

Claims

1. An engine crankshaft angle measuring tool, characterized in that: include: A body (1), wherein a guide groove (12) penetrating through two sides of the body (1) is provided in the middle of the body (1), and a cavity (13) penetrating through the guide groove (12) is provided in the upper part; A fixing claw (2), at least two fixing claws (2) are arranged opposite to each other on both sides of the body (1), one end of the fixing claw (2) is provided with a positioning groove (21), and the other end is connected to the body (1) through the guide groove (12), and the fixing claw (2) slides in the guide groove (12); A seat shaft (3), the seat shaft (3) being placed in the cavity (13), the two ends of the seat shaft (3) being connected to the fixing claws (2) arranged on both sides of the body (1), and the two ends of the seat shaft (3) being provided with limiting bosses (33); An elastic member (4), wherein the elastic member (4) is sleeved in the middle of the seat shaft (3) and connected to the limiting bosses (33) at both ends, and a distance for the elastic member (4) to be compressed is provided in the middle of the seat shaft (3); An angle gauge (7), wherein the angle gauge (7) is fixed to the bottom of the body (1).

2. The engine crankshaft angle measuring tool as claimed in claim 1, characterized in that: The fixed claw (2) comprises a guide rod (23) and a positioning rod (24), wherein the guide rod (23) and the positioning rod (24) are L-shaped; The guide rod (23) slides in the guide groove (12) and is connected to the seat shaft (3); The positioning groove (21) is arranged on the positioning rod (24), and the upper surface of the positioning rod (24) is higher than the upper surface of the body (1).

3. The engine crankshaft angle measuring tool as claimed in claim 2, characterized in that: The end of the guide rod (23) is provided with a threaded mounting hole (22); both ends of the seat shaft (3) are provided with external threads, and the external threads are matched and connected with the threaded mounting hole (22).

4. The engine crankshaft angle measuring tool as claimed in claim 1, characterized in that: The bottom of the body (1) is provided with a groove (11), and the angle gauge (7) is placed in the groove (11) and fixed on the body (1).

5. The engine crankshaft angle measuring tool as claimed in claim 4, characterized in that: The body (1) is provided with mounting holes (15) penetrating the groove (11) on both sides; the measuring tool also includes a top screw (6), and the end of the top screw (6) passes through the mounting hole (15) and abuts against the angle gauge (7).

6. The engine crankshaft angle measuring tool as claimed in claim 1, characterized in that: It also comprises a cover plate (5), wherein the cover plate (5) is arranged above the cavity (13).

7. The engine crankshaft angle measuring tool as claimed in claim 6, characterized in that: Limiting surfaces (14) are provided on both sides of the cavity (13), and the cover plate (5) is mounted on the limiting surfaces (14).

8. The engine crankshaft angle measuring tool as claimed in claim 7, characterized in that: A fixing threaded hole (141) is provided on the upper portion of the limiting surface (14), and a mounting hole corresponding to the position of the fixing threaded hole (141) is provided on the cover plate (5).

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