CN110244073B - Mechanical tappet rotation speed measuring device - Google Patents
Mechanical tappet rotation speed measuring device Download PDFInfo
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- CN110244073B CN110244073B CN201910502374.6A CN201910502374A CN110244073B CN 110244073 B CN110244073 B CN 110244073B CN 201910502374 A CN201910502374 A CN 201910502374A CN 110244073 B CN110244073 B CN 110244073B
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- mechanical tappet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
Abstract
The invention discloses a mechanical tappet rotation speed measuring device, which belongs to the technical field of engines and comprises a stator structure, wherein the stator structure comprises a conductive part and an insulating part, the conductive part and the insulating part are smoothly connected and jointly surrounded to form a cylindrical structure, and the cylindrical structure is insulated and installed on an engine cylinder body; the rotor structure comprises a conductive component, one end of the conductive component is connected to the mechanical tappet, and the other end of the conductive component is abutted against the inner wall of the cylindrical structure; the data acquisition system, the power supply, the mechanical tappet and the conductive piece are connected to form a conductive loop, and the data acquisition mechanism is configured to acquire a voltage signal in the conductive loop when the conductive loop is connected or disconnected. According to the mechanical tappet rotating speed measuring device, the rotating speed of the mechanical tappet is obtained by dividing the number of the voltage signals collected in the preset time when the conductive circuits are communicated by the preset time, so that the rotating speed of the mechanical tappet is measured in the working process of an engine, and the mechanical tappet is favorably researched.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a mechanical tappet rotating speed measuring device.
Background
The mechanical tappet is an important part in the valve actuating structure of an engine, and the tappet is a driven piece of a cam, and has the function of transmitting the motion and acting force from the cam to a push rod or a valve, and simultaneously bearing the lateral force applied by the cam and transmitting the lateral force to a machine body or a cylinder cover.
At present, the main problems affecting the service life of mechanical tappets are the occurrence of friction damage and pitting corrosion. Along with the improvement of the power and the rotating speed of the engine, the working conditions of the mechanical tappet are more rigorous, the contact stress between the cam and the mechanical tappet can be increased by the increase of the power of the engine, so that the relative sliding speed between the cam and the mechanical tappet is increased, the friction heat is increased, the friction damage and the pitting damage of the mechanical tappet can be easily caused,
in order to avoid the above problems, when the engine reaches the maximum power, the mechanical tappet needs to have a certain rotating speed, so it is important to measure the rotating speed of the mechanical tappet during the operation of the engine and determine whether the rotating speed of the mechanical tappet meets the requirement.
Disclosure of Invention
The invention aims to provide a mechanical tappet rotating speed measuring device to measure the rotating speed of a mechanical tappet in the working process.
As the conception, the technical scheme adopted by the invention is as follows:
a mechanical tappet rotation speed measuring device, comprising:
the stator structure comprises a conductive piece and an insulating piece, wherein the conductive piece and the insulating piece are smoothly connected and jointly surrounded to form a cylindrical structure, and the cylindrical structure is installed on the engine cylinder body in an insulating manner;
the rotor structure comprises a conductive component, one end of the conductive component is connected to the mechanical tappet, and the other end of the conductive component is abutted against the inner wall of the cylindrical structure;
the data acquisition system, the power supply, the mechanical tappet and the conductive piece are connected to form a conductive loop, and the data acquisition system is configured to acquire a voltage signal in the conductive loop when the conductive loop is connected or disconnected.
Furthermore, the conductive piece is a conductive cylinder body, a through notch is formed in the conductive cylinder body along the axial direction of the conductive cylinder body, and the insulating piece is arranged in the through notch.
Further, the stator structure further comprises an insulating ring, and the insulating ring is sleeved on the cylindrical structure.
Further, be provided with the push rod hole on the engine cylinder body, stator structure set up in the push rod hole, the insulating ring with push rod hole interference fit.
Further, the conductive assembly comprises a conductive rod and a conductive connecting piece, the conductive rod is connected to the mechanical tappet, the conductive connecting piece is connected to the conductive rod, and the conductive connecting piece abuts against the inner wall of the cylindrical structure.
Furthermore, the conductive connecting piece is a conductive spring, the conductive spring is sleeved on the conductive rod, and two ends of the conductive spring are connected to the conductive rod.
Further, in the extending direction of the conducting rod, the distance between the two ends of the conducting spring is smaller than the original length of the conducting spring, so that the conducting spring forms an arc-shaped structure, and the arc top of the arc-shaped structure is abutted against the inner wall of the cylindrical structure.
Further, the rotor structure further comprises a conductive locking block, the conductive locking block is attached to the inner wall surface of the mechanical tappet, and the conductive rod is connected to the conductive locking block.
Further, the locking piece is made of an aluminum material.
Further, the cylindrical structure is coaxial with the mechanical tappet.
The invention has the beneficial effects that:
the mechanical tappet rotating speed measuring device provided by the invention has the advantages that the conductive piece, the conductive component, the data acquisition system, the power supply and the mechanical tappet are connected to form a conductive loop, when the mechanical tappet drives the conductive component to rotate so that the conductive component is contacted with the conductive piece, the conductive loop is communicated, the data acquisition system acquires a primary voltage signal at the moment, when the mechanical tappet drives the conductive component to rotate until the conductive component is contacted with the insulating piece, the conductive loop is disconnected, and the rotating speed of the mechanical tappet is obtained by dividing the number of the voltage signals acquired when the conductive loop is communicated within the preset time by the preset time, so that the rotating speed of the mechanical tappet is measured in the working process of an engine, and the mechanical tappet is favorably researched.
Drawings
FIG. 1 is a schematic view of a mechanical tappet rotational speed measurement device provided herein;
FIG. 2 is a schematic view of a partial structure of a mechanical tappet rotational speed measuring device provided by the present invention;
FIG. 3 is a schematic structural view of a conductive assembly provided by the present invention;
FIG. 4 is a schematic view of an operating condition of the mechanical tappet rotational speed measuring device provided by the present invention;
fig. 5 is a schematic view of another working state of the mechanical tappet rotation speed measuring device provided by the invention. In the figure:
1. an engine block; 11. a cam; 12. a mechanical tappet; 13. a push rod;
2. a stator structure; 21. a conductive member; 22. an insulating member; 23. an insulating ring;
3. a rotor mechanism; 31. a conductive locking piece; 32. a conductive component; 321. a conductive rod; 322. a conductive connection member;
4. a data acquisition system;
5. a power source.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1 to 5, the present embodiment provides a mechanical tappet rotational speed measuring device, which is mainly used for measuring the rotational speed of a mechanical tappet during the operation of an engine, and a mechanical tappet 12 is a driven member of a cam 11 and functions to transmit the motion and force from the cam 11 to a push rod 13. The engine cylinder body 1 is provided with a push rod hole at a position corresponding to the push rod 13. The working processes and principles of the cam 11, the mechanical tappet 12 and the push rod 13 are all the prior art, and the mechanical tappet 12, the cam 11, the push rod 13 and the engine cylinder block 1 are also all common structures in the prior art, and are not described in detail herein.
Specifically, the mechanical tappet rotation speed measuring device provided in this embodiment includes a stator structure 2, a rotor structure 3, a data acquisition system 4, and a power supply 5.
As shown in fig. 2, the stator structure 2 includes a conductive member 21 and an insulating member 22, the conductive member 21 and the insulating member 22 are smoothly connected, the conductive member 21 and the insulating member 22 jointly enclose a cylindrical structure, the cylindrical structure is insulated and installed in a through rod hole of an engine, and the cylindrical structure does not interfere with the through rod 13. Preferably, in the present embodiment, the cylindrical structure is a cylindrical structure, and the cylindrical structure is coaxial with the mechanical tappet 12. Specifically, in this embodiment, the conductive member 21 is a conductive cylinder, both ends of the conductive cylinder in the axial direction have openings, a through notch is formed in the conductive cylinder along the axial direction, the insulating member 22 is disposed in the through notch, the insulating member 22 is an arc-shaped structure, the length of the insulating member 22 is equal to the length of the conductive cylinder along the axial direction of the conductive cylinder, and the conductive cylinder and the insulating member 22 together enclose the cylindrical structure. Stator structure 2 still includes insulator ring 23, and insulator ring 23 cover is located on the tubular structure to carry out insulating isolation to tubular structure and engine cylinder body 1, and insulator ring 23 and the inner wall interference fit in through-rod hole have saved other mounting structure, reduce the quantity of the valve train spare part of engine.
As shown in fig. 2, the rotor structure 3 includes a conductive element 32, one end of the conductive element 32 is connected to the mechanical tappet 12, and the other end of the conductive element is abutted against the inner wall of the cylindrical structure. The data acquisition system 4, the power source 5, the mechanical tappet 12 and the conductive member 21 are electrically connected to form a conductive loop, the mechanical tappet 12 and the conductive member 21 are electrically connected through the conductive component 32, the data acquisition system 4 can acquire a voltage signal in the conductive loop when the conductive loop is connected or disconnected, when the conductive component 32 rotates along with the mechanical tappet 12 and abuts against the conductive member 21 (as shown in fig. 3), the conductive loop is connected, and when the conductive component 32 rotates along with the mechanical tappet 12 and abuts against the insulating member 22 (as shown in fig. 4), the conductive loop is disconnected. When the conductive loop is connected, the data acquisition system 4 generates a pulse voltage signal, and the rotating speed (r/min) of the mechanical tappet 12 is equal to the number/preset time (h) of the pulse voltage signals acquired by the data acquisition system 4 when the conductive loop is connected within the preset time h.
Specifically, the conductive element 32 includes a conductive rod 321 and a conductive connector 322, the conductive rod 321 is connected to the mechanical tappet 12, the conductive connector 322 is connected to the conductive rod 321, and the conductive connector 322 abuts against the inner wall of the cylindrical structure. Preferably, in this embodiment, the conductive connecting member 322 is a conductive spring, the conductive spring is sleeved on the conductive rod 321, and both ends of the conductive spring are connected to the conductive rod 321, so that the conductive spring has a curved arc. Through adopting conductive spring, conductive spring's structure is comparatively soft, can produce certain deformation, consequently can make the frictional force of conductive component 32 and tubular structure's inner wall as far as possible little, avoids conductive component 32 to produce the influence to the rotation of mechanical tappet 12.
In addition, as shown in fig. 5, in order to enable the conductive spring to always keep the abutting relation with the inner wall of the tubular structure, both ends of the conductive spring are fixed on the conductive rod 321, and the distance between both ends of the conductive spring is smaller than the original length of the conductive spring along the extending direction of the conductive rod 321, so that the conductive spring forms an arc-shaped structure, and the arc top of the arc-shaped structure abuts against the inner wall of the tubular structure. Preferably, in this embodiment, the radian of the arc-shaped structure formed by the conductive spring is 2.8-3, which ensures that the arc-shaped structure can keep a good abutting relationship with the cylindrical structure, and simultaneously avoids the influence on the rotation of the mechanical tappet 12 due to too large friction force between the arc-shaped structure formed by the conductive spring and the cylindrical structure. Preferably, in the present embodiment, the stiffness of the conductive spring is 0.04-0.08N/m, because if the stiffness of the conductive spring is too high, the conductive spring is difficult to install, and the friction between the conductive spring and the inner wall of the cylindrical structure is increased, which affects the normal rotation of the mechanical tappet 12; if the rigidity of the conductive spring is too low, the conductive spring is likely to be permanently deformed, and thus the conductive spring is likely to be in poor contact with the inner wall of the tubular structure, which affects the measurement result.
In the present embodiment, the extending direction of the conductive rod 321 is the same as the axial direction of the mechanical tappet 12, and in order to ensure that the conductive spring is in good contact with the inner wall of the cylindrical structure and the friction force is as small as possible, the straightness tolerance of the conductive rod 321 is ± 0.2mm, because if the conductive rod 321 is deviated to one side of the inner wall of the cylindrical structure, the friction force between the conductive spring and the inner wall of the cylindrical structure is increased, and if the conductive rod 321 is deviated to the center of the cylindrical structure, the contact failure between the conductive spring and the inner wall of the cylindrical structure is easily caused. The parallelism tolerance between the center line of the conductive rod 321 and the center line of the mechanical tappet 12 is ± 0.2mm because the mechanical tappet 12 and the tubular structure are coaxial, and if the conductive rod 321 is biased toward the inner wall of the tubular structure, the friction between the conductive spring and the inner wall of the tubular structure is increased, and if the conductive rod 321 is biased toward the center of the tubular structure, the contact between the conductive spring and the inner wall of the tubular structure is likely to be poor. The verticality tolerance of the center line of the conductive rod 321 and the cross section of the mechanical tappet 12 is ± 0.1mm, because the cylindrical structure is coaxial with the mechanical tappet 12, the inner wall surface of the cylindrical structure is parallel to the inner wall surface of the mechanical tappet 12, if the conductive rod 321 deviates to one side of the inner wall of the cylindrical structure, the friction force between the conductive spring and the inner wall of the cylindrical structure is increased, and if the conductive rod 321 deviates to the center of the cylindrical structure, the contact between the conductive spring and the inner wall of the cylindrical structure is poor.
The rotor structure 3 further includes a conductive locking block 31, the conductive locking block 31 is attached to the inner wall surface of the mechanical tappet 12, and the conductive rod 321 is connected to the conductive locking block 31. The conductive lock 31 serves to fix the conductive rod 321 and to electrically connect the conductive rod 321 and the mechanical tappet 12. Specifically, in the present embodiment, the conductive lock piece 32 has an arc-shaped surface on one side, and the arc-shaped surface can be attached to the inner wall surface of the mechanical tappet 12, so that the conductive rod 321 and the mechanical tappet 12 are electrically connected, and the guide rod 321 can stably rotate along with the mechanical tappet 12. In addition, in this embodiment, the conductive rod 321 is fixed on the conductive locking block 31 by snapping, screwing, or the like, or the conductive locking block 31 has a clamping structure for clamping the conductive rod 321. In addition, in order to reduce the influence of the conductive lock block 31 on the rotation state of the mechanical tappet 12, the conductive lock block 31 is made of an aluminum material.
The installation process of the mechanical tappet rotating speed measuring device is as follows:
firstly, the conductive locking block 31, the conductive rod 321 and the conductive spring are assembled and installed, whether the conductivity among the conductive locking block 31, the conductive rod 321 and the conductive spring is good or not is detected after the installation is finished, if the conductivity is good, whether the parallelism between the center line of the conductive rod 321 and the center line of the mechanical tappet 12 meets the requirement or not is checked, and whether the verticality between the center line of the conductive rod 321 and the cross section of the mechanical tappet 12 meets the requirement or not is detected. If the conduction is not good, the assembly is carried out again.
And secondly, on the premise that the first step meets the requirement, an insulating part 22 is arranged in the through notch of the conductive cylinder body, so that the conductive cylinder body and the conductive cylinder body are well assembled and have no gap. Then, an insulating ring 23 is mounted on the outer side of the cylindrical structure, and the conductivity between the insulating ring 23 and the cylindrical structure is detected to ensure the insulation between the two. And then, installing the insulating ring 23 and the cylindrical structure in the push rod hole to ensure that the cylindrical structure is not interfered with the push rod 13, enabling the upper end face of the cylindrical structure to be flush with the upper end face of the push rod hole, and finally measuring the conductivity between the conductive cylinder and the engine cylinder body 1 to ensure the insulation between the conductive cylinder and the engine cylinder body 1.
And thirdly, attaching the arc-shaped surface of the conductive locking block 31 to the inner surface of the mechanical tappet 12 on the premise that the first step and the second step meet the requirements, and fixing the conductive locking block 31, for example, by means of bonding and the like. In addition, the arc top of the arc-shaped structure formed by the conductive spring is abutted against the inner wall of the tubular structure, and the conductive spring is ensured to be in good contact with the inner wall of the tubular structure. In addition, since the mechanical tappet 12 is attached to the engine block 1, the mechanical tappet 12 and the engine block 1 are electrically connected, and at this time, it is necessary to measure the electrical conductivity between the mechanical tappet 12 and the engine block 1 to ensure good contact.
Then the cam 11 is rotated, so that the mechanical tappet 12 drives the conductive component 32 to rotate to the position shown in fig. 3, the conductivity between the engine cylinder body 1 and the conductive component 21 is detected, and the phenomenon of poor contact is ensured. The cam 11 is rotated continuously, so that the mechanical tappet 12 drives the conductive assembly 32 to rotate to the position shown in fig. 4, and the conductivity between the engine cylinder 1 and the conductive member 21 is measured again, so as to ensure the insulation between the engine cylinder 1 and the conductive member 21.
According to the steps, each step is ensured to meet the requirements, and finally the installation of the mechanical tappet rotating speed measuring device is completed.
In summary, the mechanical tappet rotation speed measuring device provided in this embodiment connects the conductive member 21, the conductive assembly 32, the data acquisition system 4, the power source 5, and the mechanical tappet 12 (the mechanical tappet 12 is electrically connected to the engine cylinder 1, so that the mechanical tappet 12 is directly connected to the engine cylinder 1) to form a conductive loop, when the mechanical tappet 12 drives the conductive assembly 32 to rotate, so that the conductive assembly 32 contacts the conductive member 21, the conductive loop is connected, at this time, the data acquisition system 4 acquires a voltage signal, when the mechanical tappet 12 drives the conductive assembly 32 to rotate, so that the conductive assembly 32 contacts the insulating member 22, the conductive loop is disconnected, the rotation speed of the mechanical tappet 12 is obtained by dividing the number of the voltage signals acquired during the preset time when the conductive loop is connected by the preset time, so as to measure the rotation speed of the mechanical tappet 12 during the operation of the engine, is beneficial to the research on the mechanical tappet 12.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A mechanical tappet rotation speed measuring device, characterized by comprising:
the stator structure (2) comprises a conductive piece (21) and an insulating piece (22), wherein the conductive piece (21) and the insulating piece (22) are smoothly connected and jointly surrounded to form a cylindrical structure, and the cylindrical structure is mounted on the engine cylinder body (1) in an insulating manner;
the rotor structure (3) comprises a conductive component (32), one end of the conductive component (32) is connected to the mechanical tappet (12), and the other end of the conductive component (32) is abutted to the inner wall of the cylindrical structure;
the data acquisition system (4), the power supply (5), the mechanical tappet (12) and the conductive piece (21) are connected to form a conductive loop, and the data acquisition system (4) is configured to acquire a voltage signal in the conductive loop when the conductive loop is connected or disconnected;
the conductive assembly (32) comprises a conductive rod (321) and a conductive connecting piece (322), the conductive rod (321) is connected to the mechanical tappet (12), the conductive connecting piece (322) is connected to the conductive rod (321), and the conductive connecting piece (322) abuts against the inner wall of the cylindrical structure;
the conductive connecting piece (322) is a conductive spring, the conductive spring is sleeved on the conductive rod (321), and two ends of the conductive spring are connected to the conductive rod (321); in the extending direction of the conducting rod (321), the distance between two ends of the conducting spring is smaller than the original length of the conducting spring, so that the conducting spring forms an arc-shaped structure, and the arc top of the arc-shaped structure is abutted against the inner wall of the cylindrical structure.
2. The mechanical tappet rotation speed measuring device of claim 1, wherein the conductive member (21) is a conductive cylinder having a through-opening along an axial direction thereof, and the insulating member (22) is disposed in the through-opening.
3. Mechanical tappet rotational speed measuring device according to claim 1, wherein said stator structure (2) further comprises an insulating ring (23), said insulating ring (23) being sleeved on said cylindrical structure.
4. Mechanical tappet rotational speed measuring device according to claim 3, wherein a push rod bore is provided on the engine block (1), the stator structure (2) is provided in the push rod bore, and the insulating ring (23) is in interference fit with the push rod bore.
5. Mechanical tappet rotational speed measurement device according to claim 1, wherein the rotor structure (3) further comprises an electrically conductive lock (31), the electrically conductive lock (31) being attached to an inner wall surface of the mechanical tappet (12), the electrically conductive rod (321) being connected to the electrically conductive lock (31).
6. Mechanical tappet rotational speed measuring device according to claim 5, wherein said electrically conductive locking piece (31) is made of an aluminum material.
7. Mechanical tappet rotational speed measuring device according to claim 1, wherein said cylindrical structure is coaxial with said mechanical tappet (12).
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| CN201910502374.6A CN110244073B (en) | 2019-06-11 | 2019-06-11 | Mechanical tappet rotation speed measuring device |
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| CN201910502374.6A CN110244073B (en) | 2019-06-11 | 2019-06-11 | Mechanical tappet rotation speed measuring device |
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| CN110244073A CN110244073A (en) | 2019-09-17 |
| CN110244073B true CN110244073B (en) | 2021-08-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990052013A (en) * | 1997-12-20 | 1999-07-05 | 정몽규 | Tappet rotation speed measuring device |
| JP3899847B2 (en) * | 2001-06-07 | 2007-03-28 | 日産自動車株式会社 | Relative angular velocity sensor of multi-plate clutch |
| CN101655020B (en) * | 2009-09-21 | 2012-03-21 | 芜湖杰锋汽车动力系统有限公司 | Novel mechanical variable tappet mechanism and control method thereof |
| CN103590904B (en) * | 2013-11-09 | 2015-09-16 | 中国第一汽车股份有限公司 | A kind of valve rotation velocity measuring device |
| CN108344576B (en) * | 2017-01-24 | 2020-04-14 | 一汽海马汽车有限公司 | Measuring device for valve rotation condition |
| CN207719181U (en) * | 2018-01-23 | 2018-08-10 | 河源创基电子科技有限公司 | A kind of detachable glass sealed diode |
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