A kind of piston oil chamber airtightness detection frock

Abstract

The utility model relates to airtightness detection technical field discloses a kind of airtightness detection tool of piston oil cavity, including the vent pipe for the ventilation of piston oil cavity and the plug assembly for plugging piston pin seat hole, the bottom end of vent pipe is matched with the steel top oil hole of piston, the top end side of vent pipe is equipped with air inlet pipe, plug assembly includes first plug, second plug, support ring, fixed bolt and fixed nut, the diameter of first plug, second plug and support ring is respectively matched with the inner diameter of piston pin seat hole, one end of first plug is equipped with positioning groove, one end of second plug is equipped with the positioning column matched with positioning groove, support ring is sleeved on positioning column and located between first plug and second plug, fixed bolt is penetrated first plug and second plug and is connected with fixed nut. The utility model is simple and easy to operate, and is convenient for maintenance replacement.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to an airtightness testing fixture for a piston oil chamber. Background Technology

[0002] During certain engine repairs, depending on the specific requirements, a piston oil chamber airtightness test is necessary to check the seal between the piston crown and skirt. The procedure involves first sealing the piston pin seat bore with a plug, then immersing the piston in the oil pan until the oil level is above the connection between the piston skirt and crown. Air is then introduced into the piston oil chamber. If air bubbles appear in the oil pan, it indicates a leak, meaning the airtightness at the piston skirt-crown connection is insufficient. In this case, the piston crown and skirt need to be disassembled, the piston seal replaced, and then the piston crown and skirt reassembled before another airtightness test of the piston oil chamber. Currently used plugs are generally one-piece, which are prone to deformation after repeated disassembly and reassembly. Deformation affects the testing structure and is difficult to repair, increasing repair costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a piston oil chamber airtightness testing fixture that is easy to operate and convenient to maintain and replace.

[0004] To solve the above-mentioned technical problems, this utility model provides a tooling for testing the airtightness of a piston oil chamber, including a vent pipe for venting into the piston oil chamber and a plug assembly for sealing the piston pin seat hole. The bottom end of the vent pipe matches the steel top oil hole of the piston, and the top side of the vent pipe is provided with an air inlet pipe. The plug assembly includes a first plug, a second plug, a support ring, a fixing bolt, and a fixing nut. The diameters of the first plug, the second plug, and the support ring are respectively adapted to the inner diameter of the piston pin seat hole. One end of the first plug is provided with a positioning groove, and one end of the second plug is provided with a positioning post that cooperates with the positioning groove. The support ring is sleeved on the positioning post and located between the first plug and the second plug. The fixing bolt passes through the first plug and the second plug and is connected to the fixing nut.

[0005] As a preferred embodiment of this utility model, the vent pipe is provided with a first sealing ring that matches the steel top oil hole of the piston.

[0006] As a preferred embodiment of this utility model, a second sealing ring is provided between the support ring and the first plug and the second plug, respectively, and the second sealing ring matches the piston pin seat hole.

[0007] As a preferred embodiment of this utility model, the vent pipe includes a top pipe and a bottom pipe, the bottom of the top pipe is provided with a connecting groove, the top of the bottom pipe is provided with a connecting post, and the connecting post is threadedly connected to the connecting groove.

[0008] As a preferred embodiment of this utility model, the air intake pipe is provided with a one-way valve.

[0009] As a preferred embodiment of this utility model, a pressure gauge for detecting the air pressure inside the vent pipe is installed at the top end of the vent pipe.

[0010] As a preferred embodiment of this utility model, the vent pipe has concave flat portions on both sides.

[0011] As a preferred embodiment of this utility model, the first plug and the second plug are made of polytetrafluoroethylene, and the support ring is made of copper.

[0012] This utility model provides a piston oil chamber airtightness testing fixture. Compared with the prior art, its advantages are as follows: In use, the plug assembly is first embedded in the piston pin seat hole, then the bottom of the vent pipe is inserted into the piston's steel top oil hole, the piston is then immersed in the oil tank, and finally the air source is connected to the air inlet pipe and supplied with air. The gas enters the piston oil chamber sequentially through the air inlet pipe, vent pipe, and piston's steel top oil hole, thus achieving the piston oil chamber airtightness test. The operation is simple. The plug assembly includes a first plug, a second plug, a support ring, a fixing bolt, and a fixing nut. The first and second plugs are positioned and connected through the cooperation of the positioning groove and the positioning post. The support ring is sleeved on the positioning post to ensure the stability of the plug assembly. The fixing bolt and fixing nut fix the first plug, the second plug, and the support ring into a single unit, making disassembly and assembly simple. If the plug assembly wears or deforms during use, only the corresponding parts need to be disassembled and replaced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model in use;

[0014] In the diagram, vent pipe 1; inlet pipe 11; one-way valve 111; top pipe 12; connecting groove 121; bottom pipe 13; connecting column 131; first sealing ring 14; pressure gauge 15; plug assembly 2; first plug 21; positioning groove 211; second plug 22; positioning column 221; support ring 23; fixing bolt 24; fixing nut 25; second sealing ring 26; piston pin seat hole 3; steel top oil hole 4. Detailed Implementation

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0016] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] like Figure 1 As shown, a preferred embodiment of the present invention provides a piston oil chamber airtightness testing fixture, comprising a vent pipe 1 for venting into the piston oil chamber and a plug assembly 2 for sealing the piston pin seat hole 3. The bottom end of the vent pipe 1 matches the piston's steel top oil hole 4, meaning that in use, the bottom end of the vent pipe 1 engages with the piston's steel top oil hole 4. The top side of the vent pipe 1 is provided with an air inlet pipe 11. The plug assembly 2 includes a first plug 21, a second plug 22, a support ring 23, a fixing bolt 24, and a fixing nut 25. The diameters of the first plug 21, the second plug 22, and the support ring 23 are respectively adapted to the inner diameter of the piston pin seat hole 3, meaning that in use, the first plug 21, the second plug 22, and the support ring 23 respectively engage with the piston pin seat hole. 3. The first plug 21 has a positioning groove 211 at one end, and the second plug 22 has a positioning post 221 at one end that mates with the positioning groove 211. The support ring 23 is sleeved on the positioning post 221 and located between the first plug 21 and the second plug 22. The fixing bolt 24 passes through the first plug 21 and the second plug 22 and is connected to the fixing nut 25. That is, the first plug 21 and the second plug 22 are respectively provided with through holes that match the fixing bolt 24. The fixing bolt 24 passes through the through holes on the first plug 21 and the second plug 22 in sequence and is threadedly connected to the fixing nut 25. It can be understood that the fixing bolt 24 has good sealing performance with the first plug 21 and the second plug 22 and there will be no air leakage.

[0018] The working principle of this embodiment is as follows: In use, firstly, the plug assembly 2 is inserted into the piston pin seat hole 3 to seal the piston pin seat hole 3. Then, the bottom of the vent pipe 1 is inserted into the piston's steel top oil hole 4. It should be noted that at this time, there is a gap between the bottom end of the vent pipe 1 and the bottom of the piston's steel top oil hole 4. For example, the bottom end of the vent pipe 1 is designed to be arc-shaped, while the bottom of the piston's steel top oil hole 4 is designed to be flat, ensuring that gas can be delivered to the piston oil chamber through the vent pipe 1 and the steel top oil hole 4. Next, the piston is immersed in the oil tank. Finally, the gas source is connected to the air inlet pipe 11 and gas is supplied. The gas enters the piston through the air inlet pipe 11, the vent pipe 1, and the piston's steel top oil hole 4 in sequence. The piston oil chamber is inserted to test its airtightness, which is easy to operate. The plug assembly 2 in this embodiment includes a first plug 21, a second plug 22, a support ring 23, a fixing bolt 24, and a fixing nut 25. The first plug 21 and the second plug 22 are positioned and connected by the cooperation of the positioning groove and the positioning post 221. The support ring 23 is sleeved on the positioning post 221 to ensure the stability of the plug assembly. The fixing bolt 24 and the fixing nut 25 fix the first plug 21, the second plug 22, and the support ring 23 into a whole, which is easy to disassemble and assemble. If the plug assembly 2 is worn and deformed during use, only the corresponding parts need to be disassembled and replaced.

[0019] For example, the vent pipe 1 is provided with a first sealing ring 14 that matches the steel top oil hole 4 of the piston to ensure the sealing between the vent pipe 1 and the steel top oil hole 4 of the piston.

[0020] For example, a second sealing ring 26 is provided between the support ring 23 and the first plug 21 and the second plug 22 respectively. The second sealing ring 26 matches the piston pin seat hole 3 to ensure the sealing performance between the sealing assembly and the piston pin seat hole 3. When the second sealing ring 26 is worn and deformed, the first plug 21, the second plug 22 and the support block can be disassembled to replace the second sealing ring 26.

[0021] For example, the vent pipe 1 includes a top pipe 12 and a bottom pipe 13. The bottom of the top pipe 12 is provided with a connecting groove 121, and the top of the bottom pipe 13 is provided with a connecting post 131. The connecting post 131 is threadedly connected to the connecting groove 121 for easy operation. It is understood that the sealing between the connecting post 131 and the connecting groove 121 is good and no air leakage will occur.

[0022] For example, the intake pipe 11 is provided with a one-way valve 111 to prevent gas backflow.

[0023] For example, a pressure gauge 15 is installed at the top of the vent pipe 1 to detect the air pressure inside the vent pipe 1, so as to know whether the air pressure inside the vent pipe 1 meets the test requirements.

[0024] For example, generally, the pressure gauge is threaded to the vent pipe 1. The vent pipe 1 has concave flat portions on both sides. The vent pipe 1 can be fixed by clamping the flat portions with a wrench, which facilitates the installation of the pressure gauge.

[0025] For example, the first plug 21 and the second plug 22 are made of polytetrafluoroethylene, the support ring 23 is made of copper, and the piston is generally made of aluminum alloy. The hardness of polytetrafluoroethylene and copper is lower than that of aluminum alloy, so as to prevent the plug assembly 2 from scratching the piston pin seat hole 3 during use.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A tooling for testing the airtightness of a piston oil chamber, characterized in that: The device includes a vent pipe for venting air into the piston oil chamber and a plug assembly for sealing the piston pin seat hole. The bottom end of the vent pipe matches the piston's steel top oil hole, and the top side of the vent pipe has an air inlet pipe. The plug assembly includes a first plug, a second plug, a support ring, a fixing bolt, and a fixing nut. The diameters of the first plug, the second plug, and the support ring are respectively adapted to the inner diameter of the piston pin seat hole. One end of the first plug has a positioning groove, and one end of the second plug has a positioning post that mates with the positioning groove. The support ring is sleeved on the positioning post and located between the first plug and the second plug. The fixing bolt passes through the first plug and the second plug and is connected to the fixing nut.

2. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: The vent pipe is provided with a first sealing ring that matches the steel top oil hole of the piston.

3. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: A second sealing ring is provided between the support ring and the first plug and the second plug, respectively, and the second sealing ring matches the piston pin seat hole.

4. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: The vent pipe includes a top pipe and a bottom pipe. The bottom of the top pipe is provided with a connecting groove, and the top of the bottom pipe is provided with a connecting post. The connecting post is threadedly connected to the connecting groove.

5. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: The intake pipe is equipped with a one-way valve.

6. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: A pressure gauge for detecting the air pressure inside the vent pipe is installed at the top of the vent pipe.

7. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: The ventilation tube has concave flat sections on both sides.

8. The piston oil chamber airtightness testing fixture according to claim 1, characterized in that: The first plug and the second plug are made of polytetrafluoroethylene, and the support ring is made of copper.

Images