Valve speed detection device and valve speed detection method

Abstract

The present invention provides a valve speed detection device and a valve speed detection method, and relates to the field of valve detection technology. The valve speed detection device includes a pressing assembly and a detection assembly; the pressing assembly includes a driving rod and a pressing piece, the rod body of the driving rod has a hinged portion and a connecting portion arranged at intervals, the hinged portion is hinged on an external object at a fixed position, and the connecting portion is located on the side of the cylinder head assembly where the valve head is exposed; the pressing piece is connected to the connecting portion, and the pressing piece is in contact with the valve head; the driving rod is used to rotate to drive the pressing piece to move along the axial direction of the valve in the cylinder head assembly, and the pressing piece is used to drive the valve to move along the axial direction of the valve under the drive of the driving rod; the detection assembly is used to detect the valve speed. The valve speed detection device can be used without a motor, has low energy consumption, a simple structure, and lower cost, and it can directly detect the valve speed in the cylinder head assembly without using simulation parts such as valve spring simulation parts, thereby reducing detection errors.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection, and in particular to a valve speed detection device and a valve speed detection method. Background Art

[0002] The valve is an important part of the engine valve mechanism. Figure 1 As shown, valve 1 and valve spring 2 and other parts are installed on cylinder head 3, and together form a cylinder head assembly. Valve 1 includes valve head 10, valve guide 11 and valve seat 12 which is usually disc-shaped. Valve guide 11 is sleeved in valve guide 30 on cylinder head 3, and valve head 10 extends out of the top of cylinder head 3. Valve head 10 is installed with valve spring seat 4, valve spring 2 is sleeved on the outside of valve guide 11, and is connected between valve spring seat 4 and cylinder head 3.

[0003] When the engine is running, the valve guide rod 11 can rise and fall in the valve guide 30, thereby driving the valve seat 12 to rise and fall, and the rising and falling valve seat 12 can cooperate with the valve seat ring 31 at the bottom of the cylinder head 3, thereby sealing or opening the gas passage of the cylinder. In order to prevent the valve 1 and the valve seat ring 31 from wearing out and causing poor sealing, the valve needs to be able to rotate while rising and falling. Therefore, a valve rotating mechanism 5 (also called a rotary valve) is also sleeved on the outer side of the valve guide rod 11 at a position between the valve spring 2 and the cylinder head 3 to realize the rotation of the valve.

[0004] The valve rotation speed is affected by many factors such as the design, processing accuracy, and quality of the valve rotation mechanism. By detecting the valve rotation speed, it can be determined whether the valve rotation mechanism meets the requirements. The valve rotation speed measurement process is usually carried out by the supplier of the valve rotation mechanism on a special valve rotation speed test device. The test device includes a driving structure, a simulation structure, and a detection structure. The driving structure includes a motor, a gearbox, a camshaft, a push rod, and a rocker arm. The simulation structure includes simulation parts such as valve simulation parts, valve spring simulation parts, and cylinder head simulation parts. The detection structure includes a speed sensor and other detectors for detecting the valve speed. The motor is connected to the gear on the gearbox through a conveyor belt, and the camshaft is installed in the gearbox and connected to the above-mentioned gear. The push rod is vertically arranged on the gearbox, and one end of it is connected to the camshaft, and the other end is hinged to one end of the rocker arm. The middle part of the rocker arm is hinged to the top of the gearbox, and the other end is connected to the valve simulation part. During the test, the valve rotation mechanism to be tested is first sleeved on the valve simulation part and installed between the valve spring simulation part and the cylinder head simulation part. Then the motor is started. The motor can drive the gearbox gear to rotate, and then drive the camshaft to rotate, thereby driving the push rod to rise and fall. The rising and falling push rod can drive the rocker arm to rotate, and then drive the valve simulation part to rise and fall and rotate, realizing the simulation of the valve rising and falling and rotating process. During the simulation process, the valve speed can be measured using the detection structure.

[0005] However, the existing valve rotation speed testing device needs to be powered by the motor in its drive structure before it can be used, which has high energy consumption. In addition, its drive structure has the disadvantages of being complex and expensive. It is not suitable for downstream merchants such as engine manufacturers who only need to conduct incoming inspections. In addition, there are many simulated parts in its simulation structure, which leads to large measurement errors. Summary of the invention

[0006] The purpose of the present invention is to provide a valve speed detection device and a valve speed detection method to alleviate the problem that the valve rotation speed test device in the prior art needs to be powered by the motor in its driving structure before it can be used, has high energy consumption, and its driving structure has the disadvantages of complex structure and high cost, and is not suitable for downstream merchants such as engine manufacturers who only need to conduct incoming inspection. In addition, there are many simulation parts in its simulation structure, which leads to a large measurement error.

[0007] In a first aspect, the present invention provides a valve speed detection device, comprising a pressing component and a detection component;

[0008] The pressing assembly comprises a driving rod and a pressing member, the driving rod has a hinged portion and a connecting portion arranged at intervals, the hinged portion of the driving rod is hinged on an external object at a fixed position, and the connecting portion of the driving rod is located on one side of the side of the cylinder head assembly where the valve head is exposed;

[0009] The pressing member is connected to the connecting portion of the driving rod, and the pressing member abuts against the valve head; the driving rod is used to rotate with the hinge portion as the rotation center to drive the pressing member to move along the axial direction of the valve in the cylinder head assembly, and the pressing member is used to drive the valve to move along the axial direction of the valve under the drive of the driving rod;

[0010] The detection component is used to detect the rotation speed of the valve when the valve moves along its axial direction and rotates under the action of the valve rotating mechanism of the cylinder head assembly.

[0011] In an optional embodiment, the hinged portion of the driving rod is hinged to the external object via a horizontal rotating shaft perpendicular to the axial direction of the valve;

[0012] A vertical rotating shaft is rotatably connected between the horizontal rotating shaft and the external object, and the vertical rotating shaft is parallel to the axial direction of the valve and perpendicular to the horizontal rotating shaft.

[0013] In an optional embodiment, one end of the driving rod is the hinged portion, and the rod body between the two ends of the driving rod is the connecting portion;

[0014] The pressing member is slidably connected to the connecting portion of the driving rod, and the pressing member can slide along the length direction of the driving rod.

[0015] In an optional embodiment, a limiting member is provided on the connecting portion of the driving rod, and the limiting member is used to be connected to the pressing member to limit the sliding of the pressing member relative to the driving rod.

[0016] In an optional embodiment, the limiting member is a rack arranged along the length direction of the driving rod;

[0017] The pressing member is provided with a clamping member matched with the rack, and the clamping member can abut between any two adjacent teeth of the rack.

[0018] In an optional embodiment, a guide plate is further included, the guide plate is located between the drive rod and a side of the cylinder head assembly where the valve head is exposed, and the guide plate is fixed to the cylinder head assembly;

[0019] A guide hole is provided at a position of the guide plate corresponding to the valve head, and the pressing member abuts against the valve head after passing through the guide hole.

[0020] In an optional embodiment, the pressing member includes a push rod and a pressing block;

[0021] One end of the push rod is located on a side of the guide plate away from the valve cover, and the other end passes through the guide hole of the guide plate and abuts against the valve head;

[0022] One end of the pressure block is connected to the connecting portion of the driving rod, and the other end is connected to the end of the push rod away from the valve head.

[0023] In an optional embodiment, a limit head is provided at the end of the push rod away from the valve head, and the limit head can be attached to a side of the guide plate away from the valve cover;

[0024] The distance between the side surface of the limiting head close to the push rod and the side surface of the guide plate close to the push rod is equal to the maximum lift of the valve.

[0025] In an optional embodiment, the detection assembly includes a circular protractor, the inner diameter of the protractor is not less than the outer diameter of the valve seat ring sleeved outside the disc-shaped valve seat of the valve;

[0026] The protractor is used to be sleeved outside the valve seat ring and to be arranged concentrically with the valve seat ring.

[0027] In a second aspect, the present invention provides a valve speed detection method, using the valve speed detection device as described in any one of the above embodiments, comprising:

[0028] S1: using the pressing assembly in the valve detection device to push the valve in the cylinder head assembly whose valve speed is to be measured to move along its axial direction;

[0029] S2: When the valve moves along its axial direction and rotates under the action of the valve rotating mechanism of the cylinder head assembly, the detection component is used to detect the rotation speed of the valve.

[0030] In an optional embodiment, step S2 includes:

[0031] S20: After the valve moves along its axial direction and rotates under the action of the valve rotating mechanism of the cylinder head assembly, using the detection component to detect the angle of the valve rotation;

[0032] S21: Substituting the valve rotation angle into the following formula to calculate the valve rotation speed:

[0033]

[0034] Where: A is the angle of valve rotation; n is the speed of the engine where the cylinder head assembly is located; τ is the number of strokes of the engine.

[0035] The valve speed detection device provided by the present invention comprises a pressing component and a detection component. The valve speed detection device provided by the present invention is used to detect the speed of the valve in the assembled cylinder head assembly, wherein the cylinder head assembly is a prior art, and its structure and working principle have been disclosed in the background technology, and will not be repeated here. When the valve speed detection device is used to detect the speed of the valve in the cylinder head assembly, the hinged part of the driving rod is first hinged on the external object fixed in position, and the pressing piece connected to the driving rod is abutted on the valve head in the cylinder head assembly, and then the driving rod is rotated with the hinged part as the rotation center. Among them, the driving rod can play a lever role, and the driving rod can be rotated by manually pressing the driving rod. After the driving rod rotates, the pressing piece can be driven to move along the axial direction of the valve, and then the pressing piece can be used to drive the valve to move along the axial direction of the valve. At this time, with the cooperation of the valve spring in the cylinder head assembly, the process of valve lifting and lowering can be simulated. Since a valve rotating mechanism for realizing valve rotation is also installed in the cylinder head assembly, the valve can also rotate when lifting and lowering. After the valve rotates, the detection component in the valve rotation speed detection device can be used to detect the rotation speed of the valve.

[0036] Compared with the prior art, the valve speed detection device provided by the present invention can drive the pressing part and the valve to move along the axial direction of the valve by manually rotating the driving rod, without the need for a motor, thereby saving energy. Moreover, compared with the driving structure in the existing valve rotation speed test device, the pressing component structure of the valve speed detection device in the present invention is simpler, less expensive, and more convenient to use, and is suitable for downstream merchants such as engine manufacturers who only need to conduct incoming inspections. In addition, the valve speed detection device provided by the present invention can be directly used to detect the valve speed in the cylinder head assembly, without the need for simulation parts such as valve spring simulation parts and cylinder head simulation parts, and the detection error is lower.

[0037] The valve speed detection method provided by the present invention applies the above-mentioned valve speed detection device, and includes step S1 and step S2. Step S1: Use the pressing assembly in the valve detection device to push the valve in the cylinder head assembly whose valve speed is to be measured to move along its axial direction. Step S2: When the valve moves along its axial direction and rotates under the action of the valve rotation mechanism of the cylinder head assembly, use the detection assembly to detect the speed of the valve. The valve speed detection method provided by the present invention applies the above-mentioned valve speed detection device, and thus the valve speed detection method provided by the present invention has the same beneficial effects as the above-mentioned valve speed detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 is a cross-sectional view of an existing cylinder head assembly;

[0040] Figure 2 A schematic structural diagram of a cylinder head assembly and a valve speed detection device provided in an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the structure of a push rod and a limit plate provided in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the structure of a pressing block provided by an embodiment of the present invention;

[0043] Figure 5 A schematic diagram of the structure of a cylinder head assembly and a detection component provided in an embodiment of the present invention;

[0044] Figure 6 for Figure 5A schematic diagram of the structure of the detection component in FIG.

[0045] Figure 7 This is a flow chart of a valve speed detection method provided by an embodiment of the present invention.

[0046] Icons: 1-valve; 10-valve head; 11-valve guide; 12-valve seat; 2-valve spring; 3-cylinder head; 30-valve guide; 31-valve seat ring; 4-valve spring seat; 5-valve rotation mechanism; 6-pressing assembly; 60-driving rod; 600-hinge; 601-connecting part; 6010-limiting piece; 602-horizontal rotating shaft; 603-vertical rotating shaft; 61-pressing piece; 610-clamping piece; 611-push rod; 6110-limiting head; 612-pressing block; 6120-slot; 6121-clamping slot; 6122-extension part; 7-guide plate; 70-guide hole; 71-support column; 72-limiting hole; 8-cylinder head assembly; 80-limiting column; 9-protractor. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0050] Embodiment 1:

[0051] like Figure 2-Figure 6As shown, the valve speed detection device provided in this embodiment includes a pressing assembly 6 and a detection assembly. The pressing assembly 6 includes a driving rod 60 and a pressing piece 61. The rod body of the driving rod 60 has a hinged portion 600 and a connecting portion 601 arranged at intervals. The hinged portion 600 of the driving rod 60 is hinged on an external object fixed in position, and the connecting portion 601 of the driving rod 60 is located on the side of the cylinder head assembly 8 where the valve head 10 is exposed. The pressing piece 61 is connected to the connecting portion 601 of the driving rod 60, and the pressing piece 61 abuts against the valve head 10. The driving rod 60 is used to rotate with the hinged portion 600 as the rotation center to drive the pressing piece 61 to move axially along the valve 1 in the cylinder head assembly 8, and the pressing piece 61 is used to drive the valve 1 to move axially along the valve 1 under the drive of the driving rod 60. The detection component is used to detect the rotation speed of the valve 1 when the valve 1 moves along its axial direction and rotates under the action of the valve rotating mechanism 5 of the cylinder head assembly 8.

[0052] The valve speed detection device provided in this embodiment is used to detect the speed of the valve 1 in the assembled cylinder head assembly 8, wherein the cylinder head assembly 8 is a prior art. The structure of the cylinder head assembly 8, the structure of the valve 1 in the cylinder head assembly 8, and the assembly relationship of the valve 1 in the cylinder head assembly 8 are shown in FIG. Figure 1 As shown, since the specific structure and working principle of the cylinder head assembly 8 have been disclosed in the background technology, they will not be repeated here.

[0053] When the valve speed detection device is used to detect the speed of the valve 1 in the cylinder head assembly 8, the hinged portion 600 of the drive rod 60 is first hinged to a fixed foreign object, wherein the foreign object is compared to the drive rod 60, and it can be any fixed object other than the drive rod 60, such as the cylinder head 3 in the cylinder head assembly 8 or other objects located on the periphery of the cylinder head assembly 8. In this embodiment, the fixed foreign object is preferably the cylinder head 3 in the cylinder head assembly 8, and the hinged portion 600 of the drive rod 60 is hinged to the side of the cylinder head 3 where the valve head 10 is exposed.

[0054] The pressing piece 61 connected to the driving rod 60 is abutted against the valve head 10 in the cylinder head assembly 8, and then the driving rod 60 is rotated with the hinge 600 as the rotation center. Among them, the driving rod 60 can play a lever role, and the driving rod 60 can be rotated by manually pressing the driving rod 60. After the driving rod 60 rotates, the pressing piece 61 can be driven to move along the axial direction of the valve 1, and then the pressing piece 61 can be used to drive the valve 1 to move along the axial direction of the valve 1. At this time, with the cooperation of the valve spring 2 in the cylinder head assembly 8, the process of the valve 1 rising and falling can be simulated. Since the cylinder head assembly 8 is also equipped with a valve rotating mechanism 5 for realizing the rotation of the valve 1, the valve 1 can also rotate when it is raised and lowered. After the valve 1 rotates, the detection component in the valve speed detection device can be used to detect the speed of the valve 1.

[0055] Compared with the prior art, the valve speed detection device provided in this embodiment can drive the pressing member 61 and the valve 1 to move along the axial direction of the valve 1 by manually rotating the driving rod 60, without the need for a motor, thereby saving energy. Moreover, compared with the driving structure in the existing valve 1 rotation speed test device, the pressing assembly 6 of the valve speed detection device in this embodiment has a simpler structure, lower cost and more convenient use, and is suitable for downstream merchants such as engine manufacturers who only need to conduct incoming inspections. In addition, the valve speed detection device provided in this embodiment can be directly used to detect the valve speed in the cylinder head assembly 8, without the need for simulation parts such as the valve spring 2 simulation part and the cylinder head 3 simulation part, and the detection error is lower.

[0056] like Figure 2 As shown, the hinged portion 600 of the driving rod 60 is hinged on the external object through a horizontal rotating shaft 602 perpendicular to the axial direction of the valve 1. A vertical rotating shaft 603 is rotatably connected between the horizontal rotating shaft 602 and the external object, and the vertical rotating shaft 603 is parallel to the axial direction of the valve 1 and perpendicular to the horizontal rotating shaft 602.

[0057] The horizontal rotating shaft 602 is used to realize the hinge connection between the hinge portion 600 of the driving rod 60 and an external object, so that the driving rod 60 can rotate on one side of the cylinder head 3 in a direction close to or away from the cylinder head 3.

[0058] The vertical rotating shaft 603 enables the driving rod 60 to rotate on the plane where the horizontal axis is located, so as to facilitate the adjustment of the position of the pressing member 61 on the plane where the horizontal axis is located, thereby improving the flexibility of the pressing member 6. For example, Figure 2 The cylinder head assembly 8 shown includes four valves 1. When the rotation speeds of the four valves 1 are detected in sequence, the vertical rotating shaft 603 enables the pressing member 61 to be aligned with the valve heads 10 of the four valves 1 in sequence.

[0059] In order to improve the stability of the driving rod 60, in this embodiment, the vertical shaft 603 is preferably a bolt. In this case, a threaded hole matching the vertical shaft 603 may be provided on the cylinder head 3, and one end of the vertical shaft 603 is threadedly connected to the threaded hole. Two parallel ear plates may be installed at the other end of the vertical shaft 603, and the horizontal shaft 602 is rotatably connected between the two ear plates.

[0060] In this embodiment, one end of the driving rod 60 is a hinged portion 600, and the rod body between the two ends of the driving rod 60 is a connecting portion 601. The pressing member 61 is slidably connected to the connecting portion 601 of the driving rod 60, and the pressing member 61 can slide along the length direction of the driving rod 60.

[0061] The pressing member 61 is slidably connected to the connecting portion 601 of the driving rod 60, so that the position of the pressing member 61 can be adjusted on the driving rod 60, thereby further improving the flexibility of the pressing assembly 6. When the rotation speeds of multiple valves 1 are detected in sequence, it is convenient to further align the pressing member 61 with the valve heads 10 of the multiple valves 1 in sequence.

[0062] Further, such as Figure 2 As shown, a limiting member 6010 is disposed on the connecting portion 601 of the driving rod 60 , and the limiting member 6010 is used to be connected to the pressing member 61 to limit the sliding of the pressing member 61 relative to the driving rod 60 .

[0063] The limiting member 6010 is used to limit the sliding of the pressing member 61 relative to the driving rod 60 after the position of the pressing member 61 is adjusted, thereby preventing the pressing member 61 from deviating and improving the stability of the pressing member 61 in use.

[0064] In practical applications, the limiting member 6010 may be a fastener such as a pin or a bolt.

[0065] In this embodiment, the limiting member 6010 may be a rack disposed along the length direction of the driving rod 60. Figure 2 As shown, a clamping member 610 adapted to the rack is provided on the pressing member 61 , and the clamping member 610 can abut between any two adjacent teeth of the rack.

[0066] When the position of the pressing member 61 needs to be adjusted, the pressing member 61 can be directly pushed by human power to slide on the driving rod 60, and the human power can overcome the meshing force between the clamping member 610 and the rack. After the position of the pressing member 61 is adjusted, the pressing member 61 is released, and the meshing force between the clamping member 610 and the rack can be used to limit the sliding of the pressing member 61 relative to the driving rod 60, thereby ensuring the stability of the pressing member 61.

[0067] Compared with fasteners such as pins and bolts, the rack and the clamping member 610 are more convenient to use. Therefore, in this embodiment, the preferred limiting member 6010 is a rack arranged along the length direction of the driving rod 60, and the pressing member 61 is provided with a clamping member 610 adapted to the rack.

[0068] like Figure 2 and Figure 3 As shown, the valve speed detection device provided in this embodiment further includes a guide plate 7, which is located between the drive rod 60 and the side of the cylinder head assembly 8 where the valve head 10 is exposed, and the guide plate 7 is fixed to the cylinder head assembly 8. A guide hole 70 is provided at a position of the guide plate 7 corresponding to the valve head 10, and the pressing member 61 passes through the guide hole 70 and abuts against the valve head 10.

[0069] The guide hole 70 can guide the pressing member 61 in the axial movement of the valve 1 , thereby improving the stability and accuracy of the linkage process between the pressing member 61 and the valve head 10 .

[0070] In order to improve the stability of the guide plate 7, the guide plate 7 can be fixed to the cylinder head assembly 8 by fasteners such as screws.

[0071] In order to prevent the guide plate 7 from interfering with the lower pressure piece 61 in driving the valve head 10 to rise and fall, the guide plate 7 can be spaced apart from the side of the cylinder head assembly 8 where the valve head 10 is exposed, or the guide plate 7 can have a sufficient thickness so that the depth of the guide hole 70 can meet the moving stroke of the lower pressure piece 61.

[0072] In this embodiment, the guide plate 7 is preferably spaced apart from the side of the cylinder head assembly 8 where the valve head 10 is exposed. Specifically, a support column 71 perpendicular to the guide plate 7 may be provided on the side of the guide plate 7 close to the cylinder head assembly 8 where the valve head 10 is exposed. When the guide plate 7 is mounted on the cylinder head assembly 8, the support column 71 abuts against the outer side of the cylinder head 3 of the cylinder head assembly 8, so that there is a gap between the guide plate 7 and the cylinder head assembly 8.

[0073] like Figure 2 and Figure 3 As shown, the guide plate 7 is provided with a limiting hole 72 adapted to the limiting post 80 on the cylinder head assembly 8. When the guide plate 7 is installed on the cylinder head assembly 8, the limiting post 80 is inserted into the limiting hole 72, and the limiting post 80 and the limiting hole 72 are used to further improve the stability of the guide plate 7.

[0074] like Figure 2 As shown, the lower pressing member 61 includes a push rod 611 and a pressing block 612. One end of the push rod 611 is located on the side of the guide plate 7 away from the valve 1 cover, and the other end passes through the guide hole 70 of the guide plate 7 and abuts against the valve head 10. One end of the pressing block 612 is connected to the connecting portion 601 of the driving rod 60, and the other end is connected to the end of the push rod 611 away from the valve head 10.

[0075] There is no restriction on the connection method between the push rod 611 and the pressing block 612 . To improve the flexibility of the use of the lower pressing member 61 , the push rod 611 and the pressing block 612 are preferably detachably connected in this embodiment.

[0076] The detachable connection method includes abutment, threaded connection, plug connection, etc. In order to improve the use stability and convenience of the lower pressing member 61, the present embodiment preferably has the pressing block 612 and the push rod 611 plugged.

[0077] Further, such as Figure 4As shown, a slot 6120 is provided at the end of the pressing block 612 close to the push rod 611 , and the end of the push rod 611 away from the valve head 10 can be inserted into the slot 6120 .

[0078] When the cylinder head assembly 8 has multiple valves 1, the guide holes 70 and the pressing blocks 612 are both correspondingly multiple. At this time, the multiple pressing blocks 612 pass through the multiple guide holes 70 one by one and abut against the valve heads 10 of the valves 1. When the rotation speeds of the multiple valves 1 are detected sequentially, the push rods 611 can be connected to the multiple pressing blocks 612 sequentially.

[0079] like Figure 2 As shown, the end of the push rod 611 away from the valve head 10 is provided with a limit head 6110, and the limit head 6110 can be attached to the side of the guide plate 7 away from the valve 1 cover. The distance between the side of the limit head 6110 close to the push rod 611 and the side of the guide plate 7 close to the push rod 611 is equal to the maximum lift of the valve 1.

[0080] The limiting head 6110 can limit the push rod 611 in the guide hole 70 to prevent the push rod 611 from passing through the guide hole 70 and falling between the guide plate 7 and the cylinder head 3.

[0081] The limiting head 6110 and the push rod 611 can both be cylindrical, and the diameter of the limiting head 6110 is larger than the diameter of the push rod 611. The limiting hole 72 is circular, and the diameter of the limiting hole 72 is smaller than the diameter of the limiting head 6110. The limiting head 6110 is vertically fixed on the end of the push rod 611, and the limiting head 6110 and the push rod 611 are coaxially arranged.

[0082] The distance between the side of the limit head 6110 close to the push rod 611 and the side of the guide plate 7 close to the push rod 611 is equal to the maximum lift of the valve 1, which can ensure that the maximum movement range of the pressure piece 61 is the maximum lift of the valve 1. Therefore, each time the valve 1 is driven to rise and fall, there is no need to strictly control the rotation amount of the driving rod 60 to ensure that the lifting value of the valve 1 is its maximum lift value. At this time, the measured valve speed is the speed after the valve 1 is fully lifted and lowered, thereby ensuring the validity and accuracy of the valve speed detection results.

[0083] like Figure 4 As shown, the end of the pressing block 612 away from the push rod 611 is provided with a U-shaped slot 6121, and both sides of the slot opening of the slot 6121 are respectively provided with an extension portion 6122 extending toward the slot 6121. Figure 2As shown, the clamping member 610 is rod-shaped, and the clamping member 610 passes through the side walls of the clamping slot 6121 in a direction perpendicular to the depth of the clamping slot 6121 and is installed on the pressing block 612. The driving rod 60 passes through the clamping slot 6121 and abuts between the clamping member 610 and the extension 6122 in the clamping slot 6121; the rack is arranged on one side of the driving rod 60 close to the clamping member 610.

[0084] The cooperation between the U-shaped slot 6121 and the extension portion 6122 can not only realize the sliding connection between the driving rod 60 and the pressing block 612 , but also facilitate the disassembly and assembly of the pressing block 612 on the driving rod 60 , thereby improving the flexibility of use of the pressing assembly 6 .

[0085] The clamping member 610 may be cylindrical, and the clamping member 610 may be rotatably connected to the pressing block 612. The clamping member 610 is rotatably connected to the pressing block 612, which can reduce the friction resistance between the clamping member 610 and the rack, thereby facilitating sliding the pressing block 612 on the driving rod 60 to adjust the position of the pressing member 61.

[0086] In practical applications, the detection component may be a rotation speed sensor.

[0087] In this embodiment, if Figure 5 and Figure 6 As shown, the detection assembly includes a circular protractor 9, the inner diameter of which is not less than the outer diameter of the valve seat ring 31 sleeved outside the disc-shaped valve seat 12 of the valve 1. The protractor 9 is used to be sleeved outside the valve seat ring 31 and to be concentrically arranged with the valve seat ring 31.

[0088] The protractor 9 is used to detect the angle through which the disc-shaped valve seat 12 of the valve 1 rotates when the valve 1 rotates. This angle is the angle through which the valve 1 rotates.

[0089] The process of detecting the angle of rotation of the valve 1 by the protractor 9 is as follows:

[0090] During measurement, the protractor 9 is placed on the valve seat ring 31 and kept concentric therewith. The 0 degree scale line of the protractor 9 is aligned with the preset mark on the bottom surface of the valve seat 12. After the valve 1 rotates, the angle corresponding to the above mark is the angle that the valve 1 rotates.

[0091] Substituting the angle value of the valve 1 detected by the protractor 9 into formula (1) can calculate the rotation speed of the valve 1:

[0092]

[0093] Where: n v is the rotation speed of the valve 1; A is the rotation angle of the valve 1, which can be detected by the protractor 9; n is the rotation speed of the engine where the cylinder head assembly 8 is located, which is a known value; τ is the number of strokes of the engine, which is a known value.

[0094] It should be noted that in order to further reduce the error of the measurement result, in the actual measurement process, under the premise of ensuring that the lift value of valve 1 is its maximum lift value, valve 1 can be driven to rise and fall multiple times to measure the rotation angle of valve 1 multiple times, and then the average value of the above multiple measurement results is substituted into formula (1) to calculate the average speed of valve 1.

[0095] Alternatively, the valve 1 can be made to rotate several times in a cycle, and then the total rotation angle after the valve 1 rotates several times is divided by the number of times the valve 1 rotates. For example, after pressing the driving rod 60 times, the total rotation angle of the valve 1 is measured, and then the angle is divided by 10 to obtain the rotation angle of the valve 1 per cycle. Finally, the rotation angle of the valve 1 per cycle is substituted into formula (1) to calculate the average speed of the valve 1. When using this method to measure the total rotation angle of the valve 1, it is necessary to pay attention to whether the valve 1 rotates more than one circle. If it exceeds one circle, the total rotation angle measured needs to be based on the angle value corresponding to the mark on the bottom surface of the valve seat 12 plus 360 degrees.

[0096] The protractor 9 is sleeved outside the valve seat ring 31 and is arranged concentrically with the valve seat ring 31 , which can prevent the protractor 9 from blocking the disc-shaped valve seat 12 of the valve 1 , thereby preventing the protractor 9 from obstructing the process of observing the rotation angle of the valve seat 12 .

[0097] Compared with the speed sensor, the protractor 9 is more convenient to use, and the protractor 9 does not need electricity, which can save energy. In addition, the protractor 9 does not need to transmit signals, which can improve detection accuracy and reduce errors. Therefore, the preferred detection component of this embodiment includes a protractor 9 in a circular shape.

[0098] In summary, the valve speed detection device provided in this embodiment has the following advantages:

[0099] 1. No motor is needed to drive the camshaft for testing, which not only reduces energy consumption but also allows measurement when power is off.

[0100] 2. The distance between the side of the limit head 6110 close to the push rod 611 and the side of the guide plate 7 close to the push rod 611 can be precisely controlled, and is equal to the maximum lift of the valve 1, thereby improving the measurement accuracy of the valve speed.

[0101] 3. Use the protractor 9 to measure the rotation angle of the valve 1 per cycle, and then use formula (1) to calculate the rotation speed of the valve 1, which has a smaller error and higher detection accuracy.

[0102] Embodiment 2:

[0103] The valve speed detection method provided in this embodiment applies the valve speed detection device in the first embodiment, such as Figure 7As shown, the valve speed detection method provided in this embodiment includes:

[0104] Step S1: using the pressing assembly 6 in the valve 1 detection device to push the valve 1 in the cylinder head assembly 8 whose valve speed is to be measured to move along its axial direction;

[0105] Step S2: When the valve 1 moves along its axial direction and rotates under the action of the valve rotating mechanism 5 of the cylinder head assembly 8, the rotation speed of the valve 1 is detected by using a detection component.

[0106] Step S1 is to use the valve speed detection device in the first embodiment to simulate the process of the valve 1 lifting and lowering. Since the cylinder head assembly 8 is also equipped with a valve rotation mechanism 5 for realizing the rotation of the valve 1, the valve 1 can also rotate when it is lifted and lowered, that is, after step S1, the valve 1 can rotate while lifting and lowering. After step S2, the speed of the valve 1 can be detected.

[0107] It can be seen that the valve speed detection method provided in this embodiment applies the valve speed detection device in Example 1, and thus the pressing member 61 and the valve 1 can be driven to move along the axial direction of the valve 1 by manually rotating the driving rod 60, without using a motor, which can save energy. In addition, compared with the driving structure in the existing valve 1 rotation speed test device, the pressing assembly 6 used in this method has a simpler structure, lower cost and more convenient use, and is suitable for downstream merchants such as engine manufacturers who only need to conduct incoming inspections. In addition, this method can also use the valve speed detection device in Example 1 to detect the valve speed in the cylinder head assembly 8, without using simulation parts such as valve spring 2 simulation parts and cylinder head 3 simulation parts, which can reduce detection errors.

[0108] Further, step S2 includes:

[0109] Step S20: After the valve 1 moves along its axial direction and rotates under the action of the valve rotating mechanism 5 of the cylinder head assembly 8, a detection component is used to detect the rotation angle of the valve 1;

[0110] Step S21: Substitute the rotation angle of valve 1 into formula (1) to calculate the rotation speed of valve 1:

[0111]

[0112] Where: n v is the rotation speed of valve 1; A is the rotation angle of valve 1; n is the rotation speed of the engine where the cylinder head assembly 8 is located; τ is the number of strokes of the engine.

[0113] Wherein, A can be detected by the protractor 9, and n and τ are both known values.

[0114] Compared with the process of detecting the valve speed using a speed sensor or other detector, the use of the protractor 9 is more convenient. The process of detecting the A value using the protractor 9 and then calculating the valve speed using formula (1) does not require electricity or signal transmission, thereby saving energy consumption, improving detection accuracy, and reducing errors.

[0115] It should be noted that in order to further reduce the error of the measurement result, in the actual measurement process, under the premise of ensuring that the lift value of valve 1 is its maximum lift value, valve 1 can be driven to rise and fall multiple times to measure the rotation angle of valve 1 multiple times, and then the average value of the above multiple measurement results is substituted into formula (1) to calculate the average speed of valve 1.

[0116] Alternatively, the valve 1 can be made to rotate several times in a cycle, and then the total rotation angle after the valve 1 rotates several times is divided by the number of times the valve 1 rotates. For example, after pressing the driving rod 60 times, the total rotation angle of the valve 1 is measured, and then the angle is divided by 10 to obtain the rotation angle of the valve 1 per cycle. Finally, the rotation angle of the valve 1 per cycle is substituted into formula (1) to calculate the average speed of the valve 1. When using this method to measure the total rotation angle of the valve 1, it is necessary to pay attention to whether the valve 1 rotates more than one circle. If it exceeds one circle, the total rotation angle measured needs to be based on the angle value corresponding to the mark on the bottom surface of the valve seat 12 plus 360 degrees.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve speed detection device, characterized in that: It includes a pressing component (6) and a detection component; The pressing assembly (6) comprises a driving rod (60) and a pressing member (61), the rod body of the driving rod (60) comprises a hinged portion (600) and a connecting portion (601) which are arranged at intervals, the hinged portion (600) of the driving rod (60) is hinged to an external object at a fixed position, and the connecting portion (601) of the driving rod (60) is located on a side of the cylinder head assembly (8) where the valve head (10) is exposed; The pressing member (61) is connected to the connecting portion (601) of the driving rod (60), and the pressing member (61) is in contact with the valve head (10); the driving rod (60) is used to rotate with the hinge portion (600) as the rotation center to drive the pressing member (61) to move along the axial direction of the valve (1) in the cylinder head assembly (8); the pressing member (61) is used to drive the valve (1) to move along the axial direction of the valve (1) under the drive of the driving rod (60); The detection component is used to detect the rotation speed of the valve (1) when the valve (1) moves along its axial direction and rotates under the action of the valve rotating mechanism (5) of the cylinder head assembly (8); The hinged portion (600) of the driving rod (60) is hingedly connected to the external object via a horizontal rotation axis (602) perpendicular to the axial direction of the valve (1); A vertical rotating shaft (603) is rotatably connected between the horizontal rotating shaft (602) and the external object, and the vertical rotating shaft (603) is parallel to the axial direction of the valve (1) and perpendicular to the horizontal rotating shaft (602); One end of the driving rod (60) is the hinged portion (600), and the rod body between the two ends of the driving rod (60) is the connecting portion (601); The pressing member (61) is slidably connected to the connecting portion (601) of the driving rod (60), and the pressing member (61) can slide along the length direction of the driving rod (60).

2. The valve speed detection device according to claim 1, characterized in that: A limiting member (6010) is provided on the connecting portion (601) of the driving rod (60), and the limiting member (6010) is used to be connected to the pressing member (61) to limit the sliding of the pressing member (61) relative to the driving rod (60).

3. The valve speed detection device according to claim 2, characterized in that: The limiting member (6010) is a rack arranged along the length direction of the driving rod (60); The pressing member (61) is provided with a clamping member (610) adapted to the rack, and the clamping member (610) can abut between any two adjacent teeth of the rack.

4. The valve speed detection device according to any one of claims 1 to 3, characterized in that: It also includes a guide plate (7), the guide plate (7) being located between the drive rod (60) and a side of the cylinder head assembly (8) where the valve head (10) is exposed, and the guide plate (7) is fixed to the cylinder head assembly (8); A guide hole (70) is provided at a position of the guide plate (7) corresponding to the valve head (10), and the pressing member (61) abuts against the valve head (10) after passing through the guide hole (70).

5. The valve speed detection device according to claim 4, characterized in that: The pressing member (61) comprises a push rod (611) and a pressing block (612); One end of the push rod (611) is located on a side of the guide plate (7) away from the valve (1) cover, and the other end passes through the guide hole (70) of the guide plate (7) and abuts against the valve head (10); One end of the pressing block (612) is connected to the connecting portion (601) of the driving rod (60), and the other end is connected to the end of the push rod (611) away from the valve head (10).

6. The valve speed detection device according to claim 5, characterized in that: A limit head (6110) is provided at the end of the push rod (611) away from the valve head (10), and the limit head (6110) can be attached to a side of the guide plate (7) away from the valve (1) cover; The distance between the side of the limit head (6110) close to the push rod (611) and the side of the guide plate (7) close to the push rod (611) is equal to the maximum lift of the valve (1).

7. The valve speed detection device according to any one of claims 1 to 3, characterized in that: The detection assembly comprises a protractor (9) in the shape of a ring, the inner diameter of the protractor (9) being not less than the outer diameter of a valve seat ring (31) sleeved outside a disc-shaped valve seat (12) of the valve (1); The protractor (9) is used to be sleeved outside the valve seat ring (31) and to be arranged concentrically with the valve seat ring (31).

8. A valve speed detection method, using the valve speed detection device according to any one of claims 1 to 7, characterized in that: include: S1: using the pressing assembly (6) in the valve (1) detection device to push the valve (1) in the cylinder head assembly (8) whose valve speed is to be measured to move along its axial direction; S2: When the valve (1) moves along its axial direction and rotates under the action of the valve rotating mechanism (5) of the cylinder head assembly (8), the detection component is used to detect the rotation speed of the valve (1).

9. The valve speed detection method according to claim 8, characterized in that: Step S2 includes: S20: After the valve (1) moves along its axial direction and rotates under the action of the valve rotating mechanism (5) of the cylinder head assembly (8), using the detection component to detect the rotation angle of the valve (1); S21: Substituting the rotation angle of the valve (1) into the following formula to calculate the rotation speed of the valve (1): Wherein: A is the rotation angle of the valve (1); n is the rotation speed of the engine in which the cylinder head assembly (8) is located; τ is the number of strokes of the engine.

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