An engine cylinder head valve seat angle measuring mechanism

Abstract

The present invention discloses an angle measuring mechanism for the valve seat of the engine cylinder head valve, comprising: a support seat, a measuring block, a spring, a steel ball and a guide rod; one end of the support seat close to the workpiece is set as a conical surface, and an air vent hole is arranged on the support seat, and the air vent hole is communicated with an air pipe; the measuring blocks are symmetrically arranged on the conical surface of the support seat, and a gap is arranged between the measuring block and the support seat, and the gap is communicated with the air vent hole; the spring is arranged between the measuring block and the support seat, one end of the spring is connected to the measuring block, and the other end of the spring is connected to the support seat; the steel ball is arranged at one end of the measuring block close to the workpiece; the guide rod is arranged on the support seat. By the above method, the present invention can quickly detect whether the manufacturing of the angle of the valve seat of the engine cylinder head valve is within the dimensional tolerance requirements, and the pneumatic measurement can enable the detection equipment to inspect higher-grade dimensions, effectively ensuring the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring fixtures, and particularly to an angle measuring mechanism for the valve seat ring of the engine cylinder head valve. Background Art

[0002] Whether the angle of the valve seat ring of the engine cylinder head valve is processed qualified directly affects the sealing performance, power performance and fuel consumption of the engine. At present, there are usually three methods for measuring the angle of the valve seat ring of the engine cylinder head valve:

[0003] 1. Measuring with a coordinate measuring machine. Although the coordinate measuring method can measure the angle of the valve seat ring of the engine cylinder head more accurately, the operation is complex and time-consuming. The operator needs to be specially trained to operate the coordinate measuring machine, which is not suitable for mass full inspection production on site.

[0004] 2. Measuring and comparing with an angle gauge and Sudan red powder. This measuring method can only be used to compare whether the angle is qualified, and cannot accurately measure the angle of the processed part. Moreover, there is an error in the manufacture of the angle gauge, which is easy to misjudge qualified products as unqualified.

[0005] 3. Special inductance detector. This method has high instrument and tooling change cost, is easy to be damaged, and has high maintenance cost. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is to provide an angle measuring mechanism for the valve seat ring of the engine cylinder head valve, which can quickly detect whether the manufacture of the angle of the valve seat ring of the engine cylinder head valve is within the dimensional tolerance requirements. Through pneumatic measurement, the detection equipment can inspect higher-grade dimensions and effectively ensure the measurement accuracy.

[0007] To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is:

[0008] An angle measuring mechanism for the valve seat ring of the engine cylinder head valve, comprising: a support seat, a measuring block, a spring, a steel ball and a guide rod; one end of the support seat close to the workpiece is set as a conical surface, and a vent hole is arranged on the support seat, and the vent hole is communicated with an air pipe; the measuring blocks are symmetrically arranged on the conical surface of the support seat, a gap is arranged between the measuring block and the support seat, and the gap is communicated with the vent hole; the spring is arranged between the measuring block and the support seat, one end of the spring is connected to the measuring block, and the other end of the spring is connected to the support seat; the steel ball is arranged at one end of the measuring block close to the workpiece; the guide rod is arranged on the support seat.

[0009] Preferably, it further includes a gasket, the gasket is arranged on the support seat and the measuring block, the support seat and the measuring block are connected through the gasket, and screws pass through the gasket and are respectively connected to the support seat and the measuring block.

[0010] Preferably, it further includes a pressing block which is arranged on the side of the gasket away from the support seat and the measuring block, and the screw sequentially passes through the pressing block and the gasket.

[0011] Preferably, it further includes a limiting rod which is arranged inside the guiding rod, the limiting rod is threadedly connected with the guiding rod, and the limiting rod contacts the measuring block.

[0012] Preferably, the guiding rod is fixedly connected with the support seat by screws, and a positioning pin is arranged between the guiding rod and the support seat, and both ends of the positioning pin are respectively inserted into the guiding rod and the support seat.

[0013] Preferably, it further includes a nozzle which is inserted into one end of the vent hole close to the measuring block.

[0014] Preferably, it further includes a handle which is sleeved on the support seat.

[0015] Preferably, it further includes a protective sleeve which is sleeved on the air pipe.

[0016] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0017] It provides an engine cylinder head valve seat angle measuring mechanism, which can quickly detect whether the manufacturing of the engine cylinder head valve seat angle is within the dimensional tolerance requirements. Through pneumatic measurement, the detection equipment can inspect higher-grade dimensions, effectively ensuring the measurement accuracy; the measuring mechanism has a simple structure and convenient operation, and can improve the work efficiency while ensuring the measurement accuracy. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural view of an engine cylinder head valve seat angle measuring mechanism of the present invention.

[0019] Figure 2 is a cross-sectional view of an engine cylinder head valve seat angle measuring mechanism of the present invention.

[0020] Figure 3 is a cross-sectional view of the connection between an engine cylinder head valve seat angle measuring mechanism of the present invention and a workpiece.

[0021] Figure 4 is Figure 3 a partial enlarged view of A in

[0022] Figure 5 is a cross-sectional view of an engine cylinder head valve seat angle measuring mechanism of the present invention from another angle.

[0023] Description of the Reference Numerals:

[0024] Support base 1, measuring block 2, spring 3, steel ball 4, guide rod 5, gasket 6, pressing block 7, screw 8, limiting rod 9, positioning pin 10, handle 11, protective sleeve 12, air pipe 13, workpiece 14, nozzle 15. Detailed implementation mode

[0025] The following will elaborate on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] Referring to the accompanying drawings, an angle measuring mechanism for the valve seat of an engine cylinder head valve includes: a support base 1, a measuring block 2, a spring 3, a steel ball 4, and a guide rod 5. One end of the support base 1 close to the workpiece 14 is provided as a conical surface, and a ventilation hole is provided on the support base 1, and the ventilation hole is communicated with the air pipe 13. In order to facilitate adjusting the distance from the air outlet of the ventilation hole to the measuring block 2, the measuring mechanism further includes a nozzle 15, and the nozzle 15 is inserted at one end of the ventilation hole close to the measuring block 2.

[0027] The measuring blocks 2 are symmetrically arranged on the conical surface of the support base 1, and a gap is provided between the measuring blocks 2 and the support base 1, and the gap is communicated with the ventilation hole. In order to better connect the measuring block 2 and the support base 1, the measuring mechanism further includes a gasket 6, and the gasket 6 is arranged on the support base 1 and the measuring block 2, and the support base 1 and the measuring block 2 are connected through the gasket 6, and the screws 8 pass through the gasket 6 and are respectively connected to the support base 1 and the measuring block 2. That is, the gasket 6 is a whole piece and is respectively connected to the support base 1 and the measuring block 2 through two screws 8. The gasket 6 is arranged in a thin sheet shape, and its thickness can reach 2 mm, so that the gasket 6 has a certain elasticity and can play an auxiliary role while the gap size between the measuring block 2 and the support base 1 changes.

[0028] Since the gasket 6 is very thin, in order to avoid damaging the gasket 6 during the tightening process of the screw 8, the measuring mechanism further includes a pressing block 7, and the pressing block 7 is arranged on the side of the gasket 6 away from the support base 1 and the measuring block 2, and the screw 8 passes through the pressing block 7 and the gasket 6 in sequence.

[0029] The spring 3 is arranged between the measuring block 2 and the support base 1. One end of the spring 3 is connected to the measuring block 2, and the other end of the spring 3 is connected to the support base 1. In the normal state, the spring 3 is in a compressed state, and the spring 3 has a force that pushes outwards, so that the steel ball 4 welded on the measuring block 2 firmly abuts against the angle surface of the valve seat of the engine cylinder head valve. This contact is a point contact, which avoids other uncertain factors in the measurement and ensures the accuracy and repeatability of the measurement result. Through the guide rod 5, the measuring mechanism can be pre-positioned to a very good state, facilitating the subsequent measurement operation without large adjustments.

[0030] The steel ball 4 is arranged at one end of the measuring block 2 close to the workpiece 14, and the workpiece 14 is measured by the contact of the steel ball 4. The steel ball 4 can be a hard alloy steel ball 4, and the hard alloy has excellent wear resistance, which increases its service life.

[0031] The guide rod 5 is arranged on the support seat 1. The guide rod 5 is fixedly connected with the support seat 1 by screws. A positioning pin 10 is arranged between the guide rod 5 and the support seat 1, and both ends of the positioning pin 10 are respectively inserted into the guide rod 5 and the support seat 1. The lower end of the guide rod 5 is accurately positioned with the conduit hole of the workpiece 14, and the upper end of the guide rod 5 is positioned on the valve seat seat ring angle surface of the engine cylinder head valve. This contact is a line contact with a small contact area, effectively ensuring the repeatability of the measurement.

[0032] The measuring mechanism further includes a limit rod 9. The limit rod 9 is arranged in the guide rod 5. The limit rod 9 is threadedly connected with the guide rod 5 and contacts the measuring block 2. The upward and downward adjustment and screwing-out amount of the limit rod 9 can well control the protruding amount of the steel ball 4 on the measuring block 2.

[0033] During the use process, for the convenience of holding, the measuring mechanism further includes a handle 11, and the handle 11 is sleeved on the support seat 1. To extend the service life of the air pipe 13, the measuring mechanism further includes a protective sleeve 12, and the protective sleeve 12 is sleeved on the air pipe 13. The protective sleeve 12 is connected to the handle 11 through a threaded adapter.

[0034] During the actual use process, before measuring the workpiece 14 to be measured, the measuring mechanism is first zeroed in the calibration piece of the lower limit value of the measured angle. Since this calibration piece is designed and processed by simulating the area of the workpiece 14 to be measured, the positioning part dimensions are the same as those of the workpiece 14 to be measured. When the pneumatic measuring mechanism is placed in the calibration piece of the lower limit value of the measured angle, the distance gap between the measuring block 2 and the nozzle 15 in the support seat 1 is extremely small. At this time, only a very small part of the stable air flow in the pneumatic measuring mechanism leaks from the gap, and most of the gas can be discharged from the pneumatic-electric converter connected by the air pipe 13. The pneumatic-electric converter converts the gas signal of the gas discharged from the inside into an electric signal and transmits it to the computer display through a cable. At this time, this place is set as the zero position.

[0035] Secondly, place the measuring mechanism of the present invention in the calibration piece of the upper limit value of the measured angle to compare the linearity. The calibration piece of the upper limit value of the measured angle is designed and manufactured according to the upper limit of the angle, and the angle is known. Verify whether the linearity of the measuring mechanism is 1:1.

[0036] The measured parameter is the valve seat seat ring angle of the engine cylinder head valve. Through the measuring mechanism, it is converted into the air output volume from the nozzle 15 in the vent hole of the support seat 1 to the measuring block 2. The principle is similar to that of a pneumatic plug gauge for measuring the inner hole diameter. The measuring mechanism of the present invention needs to be used in cooperation with a pneumatic-electric converter and a display.

[0037] Insert the lower end of the guiding rod 5 of the measuring mechanism of the present invention into the conduit under the valve seat of the engine cylinder head to be measured first, and continue to insert the measuring mechanism along the direction of the conduit until the circumferential surface of the upper end of the guiding rod 5 is positioned and contacts the seat angle surface of the engine cylinder head valve seat. At this time, the positioning of the pneumatic measuring mechanism is completed. At the same time, the steel ball 4 welded on the measuring block 2 contacts the seat angle surface of the engine cylinder head valve seat, causing the measuring block 2 to contract inward. The distance by which the measuring block 2 contracts inward will change the distance from the inner inclined surface of the measuring block 2 to the nozzle 15, thereby affecting how much of the stable air pressure input from the air pipe 13 leaks at the nozzle 15 and how much gas is discharged from the pneumatic-electric converter. The pneumatic-electric converter converts the gas signal discharged inside into an electric signal and transmits it to the computer monitor. The operator judges whether the angle of the seat angle surface of the engine cylinder head valve seat processed is qualified according to the value displayed on the computer monitor.

[0038] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. An engine cylinder head valve seat angle measuring mechanism, characterized in that, Comprising: A support base, a measuring block, a spring, a steel ball and a guide rod; one end of the support base close to the workpiece is provided as a conical surface, and a vent hole is provided on the support base, and the vent hole is communicated with an air pipe; the measuring blocks are symmetrically arranged on the conical surface of the support base, and a gap is provided between the measuring block and the support base, and the gap is communicated with the vent hole; the spring is arranged between the measuring block and the support base, one end of the spring is connected to the measuring block, and the other end of the spring is connected to the support base; the steel ball is arranged at one end of the measuring block close to the workpiece; the guide rod is arranged on the support base; It further includes a nozzle, and the nozzle is inserted at one end of the vent hole close to the measuring block, so as to facilitate adjusting the distance from the air outlet of the vent hole to the measuring block; It further includes a gasket, the gasket is arranged on the support base and the measuring block, the support base and the measuring block are connected through the gasket, and screws pass through the gasket and are respectively connected to the support base and the measuring block. The gasket is arranged in a thin sheet shape, so that the gasket has a certain elasticity and can play an auxiliary role while the gap size between the measuring block and the support base changes; The steel ball welded on the measuring block contacts the angle surface of the valve seat of the engine cylinder head valve, causing the measuring block to contract inward. Thus, the distance of the inward contraction of the measuring block will change the distance from the inner inclined surface of the measuring block to the nozzle, and further affect how much stable air pressure input from the air pipe leaks at the nozzle and how much gas is discharged from the pneumatic-electric converter.

2. The valve seat angle measuring mechanism for the engine cylinder head according to claim 1, wherein: It further includes a pressing block, and the pressing block is arranged on the side of the gasket away from the support base and the measuring block, and the screw sequentially passes through the pressing block and the gasket.

3. The valve seat angle measuring mechanism for the engine cylinder head according to claim 1, wherein: It further includes a limiting rod, the limiting rod is arranged in the guide rod, the limiting rod is threadedly connected with the guide rod, and the limiting rod contacts the measuring block.

4. A valve seat angle measuring mechanism for an engine cylinder head according to claim 1, characterized in that: The guide rod is fixedly connected to the support base by screws, and a positioning pin is arranged between the guide rod and the support base, and both ends of the positioning pin are respectively inserted into the guide rod and the support base.

5. The valve seat angle measuring mechanism for an engine cylinder head according to claim 1, characterized in that: It further includes a handle, and the handle is sleeved on the support base.

6. The angle measuring mechanism for the valve seat of the engine cylinder head according to claim 1, wherein: It further includes a protective sleeve, and the protective sleeve is sleeved on the air pipe.

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