CN214666584U

CN214666584U - Tool for inspecting coaxiality of camshaft hole on casing of aviation piston engine

Info

Publication number: CN214666584U
Application number: CN202121033652.7U
Authority: CN
Inventors: 曾仁维; 龙小辉; 苟江红; 冯文瑞
Original assignee: Civil Aviation Flight University of China
Current assignee: Civil Aviation Flight University of China
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-11-09
Anticipated expiration: 2031-05-14

Abstract

A tool for checking the coaxiality of camshaft holes on a casing of an aviation piston engine is characterized in that the camshaft holes on the casing are divided into a first camshaft hole, a second camshaft hole and a third camshaft hole which are arranged at the same axial interval; the inspection tool comprises an inspection core rod, the outer diameter of the inspection core rod is smaller than the diameter of each camshaft hole on the case, a first inspection convex surface, a second inspection convex surface and a third inspection convex surface are formed in the axial direction of the inspection core rod in a radially outward protruding mode corresponding to the positions of the first camshaft hole, the second camshaft hole and the third camshaft hole on the case, the inspection core rod is matched with the inspection convex surfaces and the inspection convex surfaces through the design coaxiality of the camshaft holes on the case, and a clearance fit structure taking the design coaxiality as a fit clearance is formed between the inspection convex surfaces and the maximum solid diameter of any camshaft hole on the case. The inspection tool can pass through the camshaft hole, just can accomplish the inspection, the utility model discloses simple structure, convenient operation, availability factor height.

Description

Tool for inspecting coaxiality of camshaft hole on casing of aviation piston engine

Technical Field

The patent of the utility model relates to a camshaft hole axiality inspection tool on aviation piston engine machine casket.

Background

The casing of the aviation piston engine is a precise mounting base for important parts such as a crankshaft, a camshaft, a cylinder and the like. The casing of an aviation piston engine is generally of a horizontally-opposed structure and is formed by combining a left half body and a right half body. After the aviation piston engine is used for a certain time, phenomena such as fretting wear, fretting corrosion and the like can be generated at the middle joint surface of the casing, so that the pressure-bearing area at the middle joint surface is reduced, and the normal operation of each component is influenced. Meanwhile, the sealing performance of the center joint surface of the casing is affected, and lubricating oil leakage is caused. Therefore, the abutting surface in the casing of the aviation piston engine needs to be maintained regularly.

The maintenance treatment of the joint surface in the casing of the aviation piston engine is to mill the corrosion layer of the joint surface in the casing, the milling depth of the joint surface in the middle of the casing side of a single half is usually within 0.20mm, and after the milling treatment is completed, the two half bodies are combined.

However, after the milling process of the center parting surface of the casing is completed, all of the holes on the center parting surface of the casing are out of round, so that it is necessary to perform boring and honing processes on the holes to restore the roundness of the holes. In particular, after the camshaft hole is processed, it is necessary to detect the coaxiality of the camshaft hole.

At present, the coaxiality detection of a camshaft hole on a casing of an aviation piston engine is realized by adopting a three-coordinate measuring instrument. The detection mode has the technical problems of complex structure, complex operation, low use efficiency, high cost and the like.

The chinese patent document discloses a main bearing hole detection rod of a diesel engine (publication No. CN205403679U, published japanese 20160727), and the technology discloses a gauge for the main bearing hole detection rod of the diesel engine. The main bearing hole detection rod of the diesel engine comprises a rod core, wherein five main bearing hole plugs are distributed on the rod core, and the rod core and the main bearing hole plugs are coaxial; the end of the rod core is provided with a jack. The overall shape of a camshaft hole of the aviation piston engine and a main bearing hole of the diesel engine is greatly different; meanwhile, the aero-engine belongs to a highly complex and precise thermal machine, and the camshaft hole of the aero-piston engine has higher precision than a main bearing hole of a diesel engine. Therefore, the technique disclosed in this patent document can be used only for detecting the main bearing hole of the diesel engine, and cannot be applied to detecting the crank cam hole of the aviation piston engine.

Disclosure of Invention

The utility model aims to provide a: aiming at the defects of the prior art, the tool for inspecting the coaxiality of the camshaft hole on the aviation piston engine casing is simple in structure, convenient to operate, high in using efficiency and low in cost.

The technical purpose of the utility model is realized through the following technical scheme:

a tool for checking the coaxiality of camshaft holes on a casing of an aviation piston engine is characterized in that the camshaft holes on the casing are divided into a first camshaft hole, a second camshaft hole and a third camshaft hole which are arranged at the same axial interval; the inspection tool comprises an inspection core rod, the outer diameter of the inspection core rod is smaller than the diameter of each camshaft hole on the casing, a first inspection convex surface, a second inspection convex surface and a third inspection convex surface are radially and outwards formed on the inspection core rod in the axial direction corresponding to the positions of the first camshaft hole, the second camshaft hole and the third camshaft hole on the casing, the inspection core rod is matched with the inspection convex surfaces and the inspection convex surfaces in the designed coaxiality of each camshaft hole on the casing, and a clearance fit structure taking the designed coaxiality value as a fit clearance is formed between each inspection convex surface and the maximum solid diameter of any camshaft hole on the casing.

The inspection mandrel is provided with a handle segment at one axial end, the third inspection convex surface on the inspection mandrel is close to the handle segment, and the first inspection convex surface on the inspection mandrel is positioned at the end part of the other axial end of the inspection mandrel.

The periphery of the handle section of the inspection core rod is provided with a knurling layer structure.

And a rotating handle insertion hole capable of being inserted with a rotating handle is radially formed in the end part, far away from the third inspection convex surface, of the handle section of the inspection mandrel.

The radial protruding height of each inspection convex surface on the inspection mandrel is 2-5 mm.

The outer edges of the end parts of the inspection convex surfaces on the inspection core rod are respectively transited by an inclined chamfer/a circular arc chamfer.

The inspection core rod is of a round rod structure made of Cr12 MoV. The Cr12MoV round bar structure has the corrosion-resistant effect, and the service life and the precision of the core rod are guaranteed to be inspected.

The casing is a Rakanming L2A type or A1H6 type casing.

Compared with the prior art, the beneficial effects of the utility model are that:

1. in the utility model, only the inspection convex surface which corresponds to the position of the camshaft hole and meets the inspection requirement is processed on the inspection core rod, and the processing precision of other positions of the core rod only needs to meet the general use; the structure is simple, and the processing cost is low. In the use process, the inspection can be finished only by the inspection tool through the camshaft hole on the casing of the aviation piston engine, and the inspection tool is convenient to operate and high in use efficiency. In conclusion; compared with the prior art, the utility model has the technical advantages of simple structure, convenient operation, high use efficiency, low cost and the like.

2. The utility model discloses a radial protruding height of each inspection convex surface on the inspection plug is 2 ~ 5mm, and this protruding height has both effectively reduced the inspection convex surface processing degree of difficulty, has ensured the structural strength of inspection plug again.

3. The utility model discloses an inspection convex surface tip outer fringe passes through with inclined plane chamfer/circular arc chamfer respectively, can prevent effectively that the tip outer fringe of inspection convex surface from causing in the testing process to high-accuracy camshaft hole colliding with, lacerating the damage.

4. The utility model discloses a knurling layer that handle section surface set up can improve the frictional force between palm and the handle, and stability when guaranteeing the inspection can effectively improve work efficiency.

5. The utility model discloses a radial commentaries on classics handle jack that can cartridge twist grip who sets up of tip department that third inspection convex surface was kept away from to inspection plug rod handle section, at the in-service use in-process, both be convenient for hold between the fingers the operation, can make the inspection plug again realize the rotation in a circumferential direction inspection in the camshaft hole of cartridge case.

Drawings

FIG. 1 is a schematic illustration of a camshaft bore location of an aircraft piston engine case;

FIG. 2 is a schematic structural view of the present invention;

reference numerals: 1, a casing; 11-a first camshaft bore; 12-a second camshaft bore; 13-third camshaft bore; 2, inspecting the core rod; 21 — first inspection convexity; 22 — second inspection convexity; 23-third inspection convexity; 24-a handle section; 25-handle insertion hole.

Detailed Description

Specific embodiments of the present invention are described below with reference to the accompanying drawings:

example 1

The utility model relates to a camshaft hole axiality inspection tool on aviation piston engine machine casket 1, specifically, machine casket 1 is the L2A type of lekongming or A1H6 type machine casket.

As shown in fig. 1, the camshaft holes in the casing 1 are divided into a first camshaft hole 11, a second camshaft hole 12, and a third camshaft hole 13, which are arranged at a coaxial pitch.

As shown in fig. 2, the inspection tool includes an inspection core rod 2. The outer diameter of the inspection mandrel 2 is smaller than the diameter of each camshaft hole in the casing.

The axial direction of the inspection core rod 2 corresponds to the positions of the first camshaft hole 11, the second camshaft hole 12 and the third camshaft hole 13 on the machine box, a first inspection convex surface 21, a second inspection convex surface 22 and a third inspection convex surface 23 are formed in a radially protruding mode, the inspection core rod 2 is matched with the inspection convex surfaces and the inspection convex surfaces according to the designed coaxiality of the camshaft holes on the machine box, and a clearance fit structure taking the designed coaxiality value as a fit clearance is formed between the inspection convex surfaces and the maximum solid diameter of any camshaft hole on the machine box.

The camshaft hole on the aviation piston engine case 1 has the characteristic of high precision, and the corresponding detection surface of the detection core rod 2 also has the characteristic of high precision. In practice, the inspection core rod 2 may be a round rod with the same diameter, but this solution is expensive to machine. The utility model discloses in as long as process out on inspection plug 2 with the camshaft hole position correspond, accord with the inspection convex surface that the inspection required, and the machining precision of other positions of inspection plug 2 as long as accord with general use can, its simple structure, processing cost hang down. In the use, as long as the inspection instrument can pass through the camshaft hole on the aviation piston engine machine casket 1, just can accomplish the inspection, its convenient operation, availability factor height, it is visible, for prior art, the utility model has the technical advantage that simple structure, convenient operation, availability factor height.

The radial projection height of each inspection convex surface on the inspection mandrel 2 is 2 to 5mm, for example, 2mm, 3mm, or 5 mm. The convex height effectively reduces the processing difficulty of the inspection convex surface and ensures the structural strength of the inspection core rod.

The outer edges of the end parts of the inspection convex surfaces on the inspection mandrel 2 are respectively transited by bevel chamfer/circular arc chamfer. The camshaft hole is a precise part, the inspection core rod 2 needs to be inserted in the inspection process, and the outer edge of the end part of the inspection convex surface is respectively transited by an inclined chamfer/an arc chamfer so as to prevent the outer edge of the end part of the inspection convex surface from damaging the camshaft hole.

The inspection plug 2 has a circular rod structure made of Cr12 MoV. The round bar structure made of Cr12MoV has the function of corrosion resistance, and the service life and the precision of the core rod 2 are guaranteed to be tested.

The inspection mandrel 2 has a handle segment 24 at one axial end, and the third inspection convex surface 23 on the inspection mandrel 2 is close to the handle segment 24, and the first inspection convex surface 21 on the inspection mandrel 2 is at the other axial end of the inspection mandrel 2.

Example 2

Referring to FIG. 2: the other structure of the present embodiment 2 is the same as that of the embodiment 1, except that:

the outer circumference of the handle section 24 of the test mandrel 2 has a knurled layer structure. The knurling layer is adopted, so that the friction force between the palm and the handle section 24 can be improved, the stability during detection is ensured, and the working efficiency can be effectively improved.

Example 3

Referring to fig. 1 and 2: the other structure of the present embodiment 3 is the same as the embodiments 1 and 2, except that:

the handle section 24 of the inspection core rod 2 is radially provided with a rotating handle insertion hole 25 which can be inserted with a rotating handle at the end part far away from the third inspection convex surface 23. In the in-service use process, because the inspection tool is of a round bar structure, the problem of inconvenience in taking or operation exists, and the technical effect of convenience in operation can be further achieved when the inspection tool is taken or operated by rotating the handle.

Claims

1. A tool for checking the coaxiality of camshaft holes on a casing of an aviation piston engine is characterized in that the camshaft holes on the casing are divided into a first camshaft hole, a second camshaft hole and a third camshaft hole which are arranged at the same axial interval; the inspection tool comprises an inspection core rod, the outer diameter of the inspection core rod is respectively smaller than the diameter of each camshaft hole on the casing, and the inspection tool is characterized in that: the inspection core rod is provided with a first inspection convex surface, a second inspection convex surface and a third inspection convex surface which are radially and outwards formed at positions corresponding to the first camshaft hole, the second camshaft hole and the third camshaft hole on the machine box in the axial direction, the inspection core rod is matched with the inspection convex surfaces and the inspection convex surfaces according to the designed coaxiality of the camshaft holes on the machine box, and a clearance fit structure taking the designed coaxiality value as a fit clearance is formed between the inspection convex surfaces and the maximum solid diameter of any camshaft hole on the machine box.

2. The tool for checking the coaxiality of the camshaft bore on the receiver of an aviation piston engine as claimed in claim 1, wherein: the inspection mandrel is provided with a handle segment at one axial end, the third inspection convex surface on the inspection mandrel is close to the handle segment, and the first inspection convex surface on the inspection mandrel is positioned at the end part of the other axial end of the inspection mandrel.

3. The tool for checking the coaxiality of the camshaft bore on the receiver of an aviation piston engine as claimed in claim 2, wherein: the periphery of the handle section of the inspection core rod is provided with a knurling layer structure.

4. The tool for checking the coaxiality of the camshaft bore on the receiver of an aviation piston engine as claimed in claim 2, wherein: and a rotating handle insertion hole capable of being inserted with a rotating handle is radially formed in the end part, far away from the third inspection convex surface, of the handle section of the inspection mandrel.

5. The tool for checking the coaxiality of the camshaft bore on the receiver of an aviation piston engine as claimed in claim 1, wherein: the radial protruding height of each inspection convex surface on the inspection mandrel is 2-5 mm.

6. The tool for checking the coaxiality of the camshaft holes on the casing of an aviation piston engine as claimed in claim 1 or 5, wherein: the outer edges of the end parts of the inspection convex surfaces on the inspection core rod are respectively transited by an inclined chamfer/a circular arc chamfer.

7. The tool for checking the coaxiality of the camshaft holes in the casing of an aviation piston engine as claimed in claim 1, 2 or 5, wherein: the inspection core rod is of a round rod structure made of Cr12 MoV.

8. The tool for checking the coaxiality of the camshaft bore on the receiver of an aviation piston engine as claimed in claim 1, wherein: the casing is a Rakanming L2A type or A1H6 type casing.