A device for testing the air tightness of a motorcycle engine housing

Abstract

This invention discloses a motorcycle engine housing airtightness testing device, relating to the field of engine housing technology. It includes: a frame and an engine housing; a base plate and a top plate are mounted on the frame; a lifting and positioning unit is mounted on the base plate; and an airtightness testing unit is mounted on the top plate. Two second fixing plates are symmetrically arranged on the frame, and a cylinder is positioned between the two second fixing plates. The cylinder is connected to a mold-closing unit, which includes a right half-mold and a left half-mold. Each half-mold has a cavity matching the engine housing on its opposite side. A sealing blade is positioned between the right and left half-molds, dividing the interior of the engine housing into at least two independent chambers. This invention, by setting the surface of the sealing blade on the left half-mold to be completely flush with the inner wall of the engine housing, facilitates the airtightness testing unit in detecting problems within any chamber during testing, allowing for precise location of internal engine housing issues.

Description

Technical Field

[0001] This invention relates to the field of engine housing technology, and more particularly to a device for testing the airtightness of a motorcycle engine housing. Background Technology

[0002] The motorcycle engine housing is the core skeleton of the engine, and it usually contains multiple functional cavities such as the crankcase cavity and the gearbox cavity. These cavities are separated by internal partitions, but these partitions have connecting openings such as shaft holes and oil passages. Before engine assembly, the housing must undergo a rigorous airtightness test to prevent oil or air leaks during subsequent operation. Currently, the industry generally uses a fully enclosed airtightness testing technology, which involves moving two half-molds along a horizontal guide rail towards each other and closing them to cover the entire outer contour of the housing. O-rings pre-installed on the cavity surface simultaneously seal all the openings in all directions of the housing. Then, compressed air is injected into the entire inner cavity of the housing, and a pressure sensor detects the differential pressure change between the inner cavity of the housing and the reference tank to determine whether there is a leak.

[0003] Because the engine casing contains multiple interconnected cavities via partition openings, existing overall inflation detection methods can only determine whether the casing as a whole is leaking, but cannot pinpoint the specific cavity wall where the leak is occurring. If there are micro-cracks leaking between the walls of interconnected cavities while other cavities are intact, the leaked gas will only flow between the interconnected cavities after overall inflation. The pressure drop detected by the pressure sensor reflects the total leakage of all cavities. In other words, the existing detection method cannot detect cracks leaking between cavities, leading to misjudgments and misidentifying leaks as non-leaks. Furthermore, if a micro-crack leaks on the wall of one cavity while other cavities are intact, the leakage signal from the micro-crack in a single cavity will be diluted by the total volume of the multiple cavities in the existing detection method, resulting in insufficient sensitivity for micro-leak detection and an inability to distinguish the specific location of the leaking cavity. This leaves no clear location information for subsequent repairs. Summary of the Invention

[0004] One objective of this invention is to provide a motorcycle engine housing airtightness testing device. This invention solves the technical problems in existing motorcycle engine housing airtightness testing technologies, such as the inability to pinpoint the specific location of leaking cavities and the insufficient sensitivity in detecting micro-leakage, which easily leads to misjudgments.

[0005] According to an embodiment of the present invention, a motorcycle engine housing air tightness testing device includes a frame and an engine housing. A bottom plate and a top plate are provided on the frame. A lifting and positioning unit is provided on the bottom plate. The engine housing is placed on top of the lifting and positioning unit. An air tightness testing unit is provided on the top plate. Two second fixing plates are symmetrically arranged on the frame. A cylinder is arranged between the two second fixing plates. The cylinder is connected to a mold closing unit. The mold closing unit includes a right half mold body and a left half mold body. A cavity matching the engine housing is opened on the opposite side of the right half mold body and the left half mold body. A sealing blade is provided between the right half of the mold and the left half of the mold. The sealing blade divides the interior of the engine housing into at least two independent chambers. The airtightness detection unit fills each independent chamber with air and detects the pressure difference.

[0006] In a preferred embodiment, the sealing blade includes a first sealing blade and a second sealing blade. The first sealing blade is disposed on the inner wall of the left half mold body and is attached to the inner wall of the engine housing. The second sealing blade is fixedly connected to the inner walls of both the right half mold body and the left half mold body and is attached to the outer wall of the engine housing. One of the second sealing blades is connected to a locking block, which engages with the other second sealing blade.

[0007] In a preferred embodiment, the engine housing includes a shaft hole and a sealing end face. The shaft hole is located on the side of the engine housing near the right half of the mold body, and the sealing end face is located on the side of the engine housing near the left half of the mold body. A sealing ring is provided on the mating surface of the right half mold body and the left half mold body. A sealing gasket is fixedly connected to the inner wall of the right half mold body and the left half mold body. The sealing gasket on the inner wall of the right half mold body is sealed to the end sealing port. The sealing gasket on the inner wall of the left half mold body is sealed to the shaft hole. Multiple sealing gaskets are fixedly connected to the inner wall of the left sealing gasket. The sealing gaskets correspond to the cavity positions in the left half mold body.

[0008] In a preferred embodiment, a hole sealing rod and a groove sealing block are provided in the cavity of the right half mold body or the left half mold body. The hole sealing rod is inserted into the threaded hole of the engine housing, and the groove sealing block fills the recess of the engine housing.

[0009] In a preferred embodiment, unloading components are provided in the cavities of the right half mold body and the left half mold body. The unloading components include a clamping plate fixed to the inner wall of the mold body, a rubber membrane connected to the clamping plate, a push plate connected to the rubber membrane, and a telescopic cylinder and a spring between the push plate and the clamping plate. When separation is required, the spring pushes the push plate to eject the engine housing from the cavity.

[0010] In a preferred embodiment, the airtightness detection unit includes a high-pressure air source, which is fixedly connected to the top surface of the top plate. A flexible air pipe is fixedly connected to the outlet end of the high-pressure air source. An inflation valve is connected to the high-pressure air source through the flexible air pipe. An air inlet pipe is connected to the output end of the inflation valve. The air inlet pipe is connected to each independent chamber inside the right half mold body. An air vent pipe is connected to the left half of the mold body. An air pressure sensor is installed on the air vent pipe. An air release control valve is installed at the end of the air vent pipe that is away from the left half of the mold body.

[0011] In a preferred embodiment, a track unit is provided on the second fixed plate. The track unit includes a track plate, which is fixedly connected to one side between the two second fixed plates and is located above the right half mold body and the left half mold body. T-shaped plates are respectively provided on the top of the right half mold body and the left half mold body. Two sets of symmetrical connecting rods are fixedly connected to the T-shaped plates. Linear bearings are fixedly connected to the surface of the connecting rods. A groove is opened on the top surface of the track plate, and the linear bearings slide in the groove of the track plate.

[0012] In a preferred embodiment, the lifting and positioning unit includes a hydraulic rod fixed to the base plate, the output end of the hydraulic rod is connected to a lifting and positioning plate, and a positioning pin is provided on the lifting and positioning plate, the positioning pin being fitted with a recessed part of the engine housing.

[0013] In a preferred embodiment, guide posts and guide sleeve holes are respectively provided at the joint between the right half of the mold body and the left half of the mold body. The guide posts and guide sleeve holes are slidably engaged and used to limit the mold closing movement trajectory.

[0014] In a preferred embodiment, the number of intake pipes corresponds one-to-one with the number of independent chambers, and the number of pressure sensors corresponds one-to-one with the number of independent chambers, for independently detecting the pressure drop in the crankcase chamber and the gearbox chamber respectively.

[0015] The beneficial effects of this invention are: 1. The present invention sets the surface of the sealing blade of the left half mold to be completely in contact with the inner wall of the engine housing, and the sealing blade of the inner wall of the right half mold to be completely in contact with the outer wall of the engine housing, thereby dividing the engine housing and the right half mold or the left half mold into two independent chambers. This makes it convenient for the airtightness detection unit to find problems in either chamber during the detection process, and can accurately find the problem inside the engine housing. 2. In this invention, during the separation of the right half mold body and the left half mold body from the engine housing, the unloading assembly uses the spring and telescopic cylinder to exert the pushing force of the push plate on the engine housing, so that the engine housing remains relatively stationary during the movement of the right half mold body and the left half mold body, and is always in the middle position between the right half mold body and the left half mold body, which facilitates subsequent unloading. There are multiple circular protrusions between the push plate and the engine housing, which reduces the contact area between the push plate and the engine housing. 3. The present invention provides tension to the right half mold body and the left half mold body by setting the right half mold body and the left half mold body to move on the surface of the track plate through the T-shaped plate, thereby preventing the cylinder from deforming when it passes through the output end and is supported by the right half mold body and the left half mold body for a long time. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of a motorcycle engine housing airtightness testing device proposed in this invention.

[0017] Figure 2 This is a schematic diagram of the detection unit and mold closing unit of a motorcycle engine housing airtightness testing device proposed in this invention.

[0018] Figure 3 This is a schematic diagram of the right half of the mold connection structure of a motorcycle engine housing airtightness testing device proposed in this invention.

[0019] Figure 4 This is a schematic diagram of the left half of the mold connection structure of a motorcycle engine housing airtightness testing device proposed in this invention.

[0020] Figure 5 This is a schematic diagram of the left cross-sectional structure of a motorcycle engine housing airtightness testing device proposed in this invention.

[0021] Figure 6 This is a right-side cross-sectional view of a motorcycle engine housing airtightness testing device proposed in this invention.

[0022] Figure 7 This is a top view sectional view of a motorcycle engine housing airtightness testing device proposed in this invention.

[0023] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle.

[0024] Figure 9 This is a schematic diagram of the combined structure of the left and right halves of a motorcycle engine housing airtightness testing device proposed in this invention.

[0025] Figure 10 This is a schematic cross-sectional view of the left and right halves of the mold body of a motorcycle engine housing airtightness testing device proposed in this invention.

[0026] Figure 11 This is a schematic cross-sectional view of the left and right halves of the motorcycle engine housing airtightness testing device proposed in this invention, assembled with the engine housing.

[0027] Figure 12 This is a simplified cross-sectional view of the left and right halves of the motorcycle engine housing airtightness testing device proposed in this invention, assembled with the engine housing.

[0028] Figure 13 This is a simplified cross-sectional view of the left and right halves of the motorcycle engine housing airtightness testing device proposed in this invention.

[0029] In the diagram: 1. Frame; 2. Base plate; 3. Lifting and positioning unit; 31. First fixed plate; 32. Hydraulic rod; 33. Lifting and positioning plate; 34. Positioning pin; 4. Top plate; 5. Air tightness detection unit; 51. High-pressure air source; 52. Flexible air pipe; 53. Inflation valve; 54. Inlet pipe; 55. Outlet pipe; 56. Air pressure sensor; 6. Cylinder; 7. Mold closing unit; 71. Right half of the mold body; 72. Left half of the mold body; 73. Sealing gasket; 74. Chamber; 75. Sealing gasket; 76. Partition blade; 761. First fixed plate; 77. Hydraulic rod; 38. Lifting and positioning plate; 39. Positioning pin; 20. Positioning pin; 30. Positioning pin; 31. First fixed plate; 32. Hydraulic rod; 33. Lifting and positioning plate; 34. Positioning pin; 55. Lifting and positioning plate; 66. Positioning pin; 761. First fixed plate; 77. Hydraulic rod; 78. Hydraulic rod; 79. Hydraulic rod; 70. Hydraulic rod; 71. Hydraulic rod; 32. Hydraulic rod; 33. Lifting and positioning plate; 34. Positioning pin; 55. Hydraulic rod; 76. Hydraulic rod; 77. Hydraulic rod; 78. Hydraulic rod; 79. Hydraulic rod; 70. Hydraulic rod; 71. Hydraulic rod; 32. Hydraulic rod; 33. Lifting and positioning plate; 34. Positioning pin; 55. Hydraulic rod; 76. Hydra 762. First partition blade; 763. Clamping block; 77. Unloading assembly; 771. Rubber diaphragm; 772. Telescopic cylinder; 773. Spring; 774. Push plate; 775. Clamping plate; 78. Groove sealing block; 79. Hole sealing rod; 710. Guide post; 711. Sealing ring; 8. Second fixing plate; 9. Track unit; 91. Track plate; 92. T-shaped plate; 93. Connecting rod; 94. Linear bearing; 95. Slide groove; 10. Engine housing; 101. Shaft hole; 102. Sealing end face. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 A motorcycle engine housing air tightness testing device includes a frame 1 and an engine housing 10. A bottom plate 2 and a top plate 4 are provided on the frame 1. A lifting and positioning unit 3 is provided on the bottom plate 2. The engine housing 10 is placed on top of the lifting and positioning unit 3. An air tightness testing unit 5 is provided on the top plate 4. Two second fixing plates 8 are symmetrically arranged on the frame 1. A cylinder 6 is arranged between the two second fixing plates 8. The cylinder 6 is connected to a mold closing unit 7. The mold closing unit 7 includes a right half mold body 71 and a left half mold body 72. The right half mold body 71 and the left half mold body 72 are respectively provided with cavities that match the engine housing 10 on opposite sides. A sealing blade 76 is provided between the right half mold 71 and the left half mold 72. The sealing blade 76 divides the interior of the engine housing 10 into at least two independent chambers 74. The air tightness detection unit 5 fills each independent chamber 74 with air and detects the pressure difference. It should be noted that during use, the cylinder 6 pushes the right half mold 71 and the left half mold 72 to house the engine housing 10. After housing, the sealing blade 76 divides the right half mold 71, the left half mold 72 and the engine housing 10 into two independent chambers, so that the gas between the two independent chambers does not flow between them and is in a relatively sealed state. At the same time, the surface of the sealing blade 76 of the left half mold 72 is set to be completely in contact with the inner wall of the engine housing 10, and the sealing blade 76 of the inner wall of the right half mold 71 is completely in contact with the outer wall of the engine housing 10. Thus, the engine housing 10 is divided into two independent chambers with the right half mold 71 or the left half mold 72. This makes it convenient for the airtightness detection unit 5 to find problems inside either chamber 74 during the detection process, and can accurately find the problem inside the engine housing 10.

[0032] refer to Figure 10 The sealing blade 76 includes a first sealing blade 761 (i.e., the inner insertion part) and a second sealing blade 762 (i.e., the outer insertion part). The first sealing blade 761 is disposed on the inner wall of the left half mold body 72 and is in contact with the inner wall of the engine housing 10. The second sealing blade 762 is fixedly connected to the inner walls of both the right half mold body 71 and the left half mold body 72 and is in contact with the outer wall of the engine housing 10. One of the second sealing blades 762 is connected to a locking block 763, which engages with the other second sealing blade 762. It should be noted that the reference Figure 11 , 1213. The first sealing blade 761 is located inside the engine housing 10, and the second sealing blade 762 is located inside the cavity of the right half mold 71 and the left half mold 72, fitting against the outer wall of the engine housing 10. This serves to isolate the engine housing 10 from the cavities of the left half mold 72 and the right half mold 71, preventing air leakage on one side of the engine housing 10. This ensures that the multiple independent chambers 74 formed by the sealing blades 76 have good sealing and isolation effects, effectively preventing gas exchange and cross-contamination between chambers, and ensuring the safety of each... Each independent chamber provides an isolated environment for airtightness testing, structurally avoiding issues such as deviations in test data and inaccurate results caused by interconnection between chambers. This stabilizes and improves the accuracy and reliability of the airtightness testing. By setting a locking block 763 at the end of the second sealing blade 762 in the left half mold body 72 and opening a matching slot at the corresponding position of the second sealing blade 762 in the right half mold body 71, the second sealing blade 762 can be fitted and positioned during mold closing and docking. This concave-convex fitting structure can fill the gap between the blades and eliminate problems such as fitting gaps, misalignment, and leakage.

[0033] refer to Figure 2 and Figure 3 The engine housing 10 includes a shaft hole 101 and a sealing end face 102. The shaft hole 101 is located on the side of the engine housing 10 near the right half mold body 71, and the sealing end face 102 is located on the side of the engine housing 10 near the left half mold body 72. A sealing ring 711 is provided on the mating surface of the right half mold body 71 and the left half mold body 72. A sealing gasket 73 is fixedly connected to the inner wall of the right half mold body 71 and the left half mold body 72. The sealing gasket 73 provided on the inner wall of the right half mold body 71 is sealed to the sealing end face 102. The sealing gasket 73 provided on the inner wall of the left half mold body 72 is sealed to the shaft hole 101. Multiple sealing gaskets 75 are fixedly connected to the inner wall of the left sealing gasket 73. The sealing gaskets 75 correspond to the cavity positions in the left half mold body 72. It should be noted that by setting the sealing ring 711, the right half mold body 71 and the left half mold body 72 are ensured to be in a sealed state after the mold is closed, and there will be no gap between the right half mold body 71 and the left half mold body 72. The sealing gasket 73 is set to seal the connection between the right half mold body 71 and the left half mold body 72 and the engine housing 10. The sealing gasket 73 inside the left half mold body 72 seals the sealing end face 102 of the engine housing 10. The sealing gasket 75 is set on the inner wall of the left half mold body 72 to seal the gap between the sealing gasket 73 and the left half mold body 72, so that the gas can directly enter the air pressure check position after passing through the sealing gasket 73 and the sealing gasket 75. The device performs airtightness testing only on the engine housing 10, preventing leakage through any gaps in the inner wall of the left half-mold 72. This ensures the accuracy of the test results for the engine housing 10. The sealing gasket 73 inside the right half-mold 71 seals the shaft hole 101 of the engine housing 10, ensuring that there is no gas flow between the right half-mold 71 and the left half-mold 72 during the airtightness test. This determines the sealing effect between the right half-mold 71 and the left half-mold 72 and the engine housing 10 during the airtightness test, thereby improving the accuracy of the airtightness test.

[0034] refer to Figure 3 and Figure 5 The right half mold body 71 is provided with a hole sealing rod 79 and a groove sealing block 78 in the cavity. The hole sealing rod 79 is inserted into the threaded hole of the engine housing 10, and the groove sealing block 78 fills the recess of the engine housing 10. It should be noted that the hole sealing rod 79 is used to insert and seal the threaded holes and other grooves on the surface of the engine housing 10 to prevent air leakage. The groove sealing block is used to fill the depressions on the surface of the engine housing 10 for sealing the irregular holes in the engine housing 10.

[0035] refer to Figure 7 As shown, a material unloading assembly 77 is provided in the cavity of the right half mold body 71 and the left half mold body 72. The material unloading assembly 77 includes a clamping plate 775 fixed to the inner wall of the mold body. A rubber membrane 771 is connected to the clamping plate 775. A push plate 774 is connected to the rubber membrane 771. A telescopic cylinder 772 and a spring 773 are provided between the push plate 774 and the clamping plate 775. When separation is required, the spring 773 pushes the push plate 774 to push the engine housing 10 out of the cavity. It should be noted that, by setting the unloading assembly 77 to separate the right half mold body 71 and the left half mold body 72 from the engine housing 10, the spring 773 and the telescopic cylinder 772 exert a pushing force on the push plate 774 on the engine housing 10, so that the engine housing 10 remains relatively stationary during the movement of the right half mold body 71 and the left half mold body 72, and is always in the middle position between the right half mold body 71 and the left half mold body 72, which facilitates subsequent unloading. There are multiple circular protrusions between the push plate 774 and the engine housing 10, which reduces the contact area between the push plate 774 and the engine housing 10. At the same time, a clamping plate 775 is set at the right half mold body 71 and the left half mold body 72 to clamp and fix them, which makes it easy to determine whether the unloading assembly 77 needs to be replaced after long-term use, thereby maintaining the sealing state of the rubber membrane 771.

[0036] refer to Figure 1 , Figure 2 , Figure 3 and Figure 10 The airtightness detection unit 5 includes a high-pressure air source 51, which is fixedly connected to the top surface of the top plate 4. A flexible air pipe 52 is fixedly connected to the outlet end of the high-pressure air source 51. An inflation valve 53 is connected to the high-pressure air source 51 through the flexible air pipe 52. An air inlet pipe 54 is connected to the output end of the inflation valve 53. The air inlet pipe 54 is connected to each independent chamber 74 inside the right half mold body 71. A vent pipe 55 is connected to the left half mold body 72. A pressure sensor 56 is installed on the vent pipe 55. A vent control valve is installed at the end of the vent pipe 55 away from the left half mold body 72. It should be noted that the gas used for testing is injected into the flexible air tube 52 through the high-pressure gas source 51. The gas is injected into the position of the inflation valve 53 through the double connector connected to the flexible air tube 52. The inflation valve 53 is opened, and the gas enters the inner wall of the intake pipe 54 through the inflation valve 53. The two independent intake pipes 54 respectively inject the gas into the cavity opened inside the right half mold body 71. Then the gas enters the inside of the shaft hole 101 through the cavity opened inside the right half mold body 71. Then the gas enters the two independent chambers 74 separated by the sealing blade 76 through the shaft hole 101. The gas enters the exhaust pipe 55 through the sealing end face 102 in the flowing state. Then the venting control valve is closed, allowing the gas to enter the engine housing 1. The gas inside the engine housing 10 is stored at a certain pressure for a certain period of time. During this time, the air pressure in the exhaust pipe 55 (i.e., the air pressure inside the engine housing 10) is continuously detected by the air pressure sensor 56. The test is conducted to see if the gas pressure inside the engine housing 10 changes after storing the gas for a period of time. If the pressure drop of the corresponding channel of the exhaust pipe connected to the air pressure sensor 56 exceeds the standard, it is determined that there is a leak in the corresponding wall of the engine housing 10. This allows for accurate and long-term detection of the airtightness of the engine housing 10, preventing inaccurate detection results due to small holes at the leak location. After the test is completed, the venting control valve is opened to slowly release the gas stored inside the engine housing 10, ensuring the safety of the released gas.

[0037] It should be noted that the above-mentioned air path and air pressure sensor 56 settings are only one possible configuration. If necessary, other configuration methods can also be used for detection. For example, if more first sealing blades 761 are set to divide the internal space of the engine housing 10 into more sections, multiple air pressure sensors 56 can be set and directly placed in the area of ​​the left half mold 72 corresponding to the chamber 74 of the engine housing 10. At this time, the configuration of the air intake pipe 54 can also be changed, and each air intake pipe 54 can be directly placed on the left half mold 72 and each air intake pipe 54 can be set to correspond to each chamber 74. The air outlet pipe 55 can be removed, and the air filling detection can be performed directly to each chamber 74.

[0038] refer to Figure 2 and Figure 9 The second fixed plate 8 is provided with a track unit 9, which includes a track plate 91. The track plate 91 is fixedly connected to one side between the two second fixed plates 8, and the track plate 91 is located above the right half mold body 71 and the left half mold body 72. The top of the right half mold body 71 and the left half mold body 72 are respectively provided with T-shaped plates 92. Two sets of symmetrical connecting rods 93 are fixedly connected to the T-shaped plates 92. Linear bearings 94 are fixedly connected to the surface of the connecting rods 93. The top surface of the track plate 91 is provided with a groove 95, and the linear bearings 94 slide in the groove 95 of the track plate 91. It should be noted that when the cylinders 6 on the left and right sides are activated, they drive the right half mold 71 and the left half mold 72 to move respectively. During the movement, the right half mold 71 and the left half mold 72 drive the connecting rod 93 and the linear bearing 94 to move through the T-shaped plate 92. The connecting rod 93 and the linear bearing 94 move inside the groove opened on the top surface of the track plate 91, keeping the right half mold 71 and the left half mold 72 moving horizontally and stably. The design of the T-shaped plate 92 and the track plate 91 can provide auxiliary support for the mold that carries the engine housing 10, share the force load on the output end of the cylinder 6, and avoid deformation, displacement and wear and aging caused by stress concentration when the cylinder 6 supports the mold in one direction for a long time and pushes and pulls the mold. This greatly improves the stability and structural strength of the equipment during long-term operation and ensures the mold closing accuracy and airtightness detection accuracy.

[0039] refer to Figure 1 and Figure 6 The lifting and positioning unit 3 includes a hydraulic rod 32 fixed on the base plate 2. The output end of the hydraulic rod 32 is connected to a lifting and positioning plate 33. A positioning pin 34 is provided on the lifting and positioning plate 33. The positioning pin 34 fits into the recessed part of the engine housing 10. It should be noted that the engine housing 10 is lifted by the lifting and positioning unit 3 to control its height. The position of the engine housing 10 is limited by the positioning pin 34, which is manually adjusted to ensure that the engine housing 10, positioned by the positioning pin 34, is in the middle of the top surface of the lifting and positioning plate 33. This ensures that the distance between the right half-mold 71 or the left half-mold 72 and the engine housing 10 is equal, preventing the engine housing 10 from sliding due to insufficient thrust on the other side when the right half-mold 71 or the left half-mold 72 first contacts the engine housing 10. In use, the hydraulic rod 32 on the top surface of the first fixed plate 31 drives the lifting positioning plate 33 to move downward. The lifting positioning plate 33 drives the positioning pin 34 to separate from the engine housing 10. Through the supporting effect of the positioning pin 34, there is a distance between the engine housing 10 and the lifting positioning plate 33 equivalent to the thickness of the outer shell of the right half mold 71 and the left half mold 72, so that the right half mold 71 and the left half mold 72 can smoothly put the engine housing 10 into the inner wall. The cylinder 6 continues to drive the right half mold 71 and the left half mold 72 to move until the right half mold 71 and the left half mold 72 completely put the engine housing 10 into the interior.

[0040] refer to Figure 4 and Figure 7 Guide pillars 710 are provided in the cavities of both the right half mold body 71 and the left half mold body 72. The guide pillars 710 cooperate with the guide sleeve holes opened on the surfaces of the right half mold body 71 and the left half mold body 72 to limit the mold closing movement trajectory. It should be noted that by setting the guide post 710 to precisely match the guide sleeve hole, the opening and closing movement trajectory of the right half mold body 71 and the left half mold body 72 can be limited and guided throughout the entire process, effectively avoiding problems such as mold body sliding deviation and alignment deviation. During the process of the cylinder 6 driving the mold closing unit 7 to open and close the mold, the guide post 710 can ensure that the two mold bodies always move smoothly along the preset straight trajectory, eliminating the situation of mold body misalignment and poor fit caused by uneven force and track sliding deviation. It ensures that the mold body mating surface and the engine housing 10 are precisely fitted after mold closing, ensuring the sealing accuracy of the chamber 74, effectively reducing the wear caused by long-term opening and closing of the mold body, improving the overall mold closing accuracy and service life of the device, and ensuring the stability and accuracy of the testing work.

[0041] refer to Figure 2 and Figure 3 The number of intake pipes 54 corresponds one-to-one with the number of independent chambers 74, and the number of pressure sensors 56 corresponds one-to-one with the number of independent chambers 74, used to independently detect the pressure drop of each chamber 74. It should be noted that this device adopts a matching arrangement structure in which multiple sets of air intake pipes 54 and pressure sensors 56 correspond one-to-one with independent chambers 74, respectively corresponding to the chambers 74 of the engine housing 10, to achieve independent inflation and detection of the two chambers. During the detection process, each air intake pipe 54 delivers pressure-stabilized gas to its corresponding chamber 74 independently, and each pressure sensor 56 monitors the pressure drop changes inside the corresponding chamber 74 in real time and accurately. The staff can intuitively determine the sealing status of each chamber through the pressure parameters fed back by the pressure sensors 56. If the displayed value of one pressure sensor 56 changes, it can be determined that there is a gas leak in the corresponding chamber connected to the pressure sensor 56. This independent paired detection structure solves the drawback of traditional whole detection that cannot distinguish the leaking chamber, realizes the accurate location of the fault point, and effectively improves the accuracy of the airtightness detection of the engine housing 10 and the maintenance efficiency.

[0042] Working principle: When it is necessary to test the air tightness of the motorcycle engine housing 10, the motorcycle engine housing 10 needs to be placed on the top of the lifting positioning plate 33 by manual or mechanical arm, and positioned by the positioning pin 34 on the top of the lifting positioning plate 33, so that the motorcycle engine housing 10 is fixedly placed in the middle position of the top of the lifting positioning plate 33. During the mold closing process, the cylinders 6 on both sides are activated, driving the right half mold body 71 and the left half mold body 72 to move respectively. During this movement, the right half mold body 71 and the left half mold body 72 move via the T-shaped plate 92, which in turn moves the connecting rod 93 and the linear bearing 94. The connecting rod 93 and the linear bearing 94 move within the grooves on the top surface of the track plate 91, maintaining the horizontal stability of the right half mold body 71 and the left half mold body 72 during movement. The T-shaped plate 92 moves on the surface of the track plate 91, providing tension to the right half mold body 71 and the left half mold body 72 after they accommodate the engine housing 10, preventing deformation of the cylinders when they are supported by the output end for an extended period. During movement, the right half mold body 71 and the left half mold body 72 contact the engine housing 10, and the right half mold body 71 and the left half mold body 72 move a certain distance into the engine housing 10. After separation, the hydraulic rod 32 on the top surface of the first fixed plate 31 drives the lifting positioning plate 33 to move downward. The lifting positioning plate 33 drives the positioning pin 34 to separate from the engine housing 10. Through the support effect of the positioning pin 34, there is a distance between the engine housing 10 and the lifting positioning plate 33 equivalent to the thickness of the outer shell of the right half mold 71 and the left half mold 72, so that the right half mold 71 and the left half mold 72 can smoothly insert the engine housing 10 into the inner wall. The cylinder 6 continues to drive the right half mold 71 and the left half mold 72 to move until the right half mold 71 and the left half mold 72 completely insert the engine housing 10 into the interior. The engine housing 10 enters the interior of the right half mold 71 and the left half mold 72. The space between the outer wall of the engine and the interior of the right half mold 71 and the left half mold 72 is filled by the sealing gasket 73, so that the contact position between the engine housing 10 and the outer wall of the right half mold 71 and the left half mold 72 is in a sealed state. The test is initiated by activating the airtightness testing unit 5. A fixed pressure of gas is injected into the flexible air tube 52 via the high-pressure gas source 51. The gas is injected into the inflation valve 53 through the double connector connected to the flexible air tube 52. The inflation valve 53 is then opened, allowing the gas to enter the inner wall of the intake pipe 54. The two intake pipes 54 inject gas into their respective chambers. The engine housing 10 is separated into two independent chambers 74 by the sealing blade 76. Gas is injected into the left half of the mold 72 through the shaft hole 101 of the engine housing 10. The gas then enters the engine housing 10, and at this time, the venting control valve at the end of the outlet pipe 55 is closed. The pressure sensor 56 connects to the corresponding chamber 74 inside the engine housing 10 via the outlet pipe 55. The pressure sensor 56 then detects the pressure of the gas after it passes through the engine housing 10. If the pressure drop of the corresponding pressure sensor 56 exceeds the limit, the corresponding chamber 74 leaks, achieving precise positioning detection. After the test is completed, the venting control valve is opened to release air. Then, the right half mold 71 and the left half mold 72 are slowly separated by cylinder 6, causing either the right half mold 71 or the left half mold 72 to separate from the engine housing 10. During movement, the right half mold 71 and the left half mold 72 maintain stable movement via the track unit 9. A certain pressure of air exists between the engine housing 10 and either the right half mold 71 or the left half mold 72, causing the right half mold 71 and the left half mold 72 to move slowly. During the separation of the left half mold body 72, the push plate 774 pushes the engine housing 10 under the action of the spring 773 inside the telescopic cylinder 772, so that the engine housing 10 is always located in the middle position between the right half mold body 71 and the left half mold body 72, above the lifting positioning plate 33. Then, the hydraulic rod 32 is activated to drive the lifting positioning plate 33 to move upward. The positioning pin 34 set on the surface of the lifting positioning plate 33 limits the engine housing 10, making it convenient for subsequent workers or robotic arms to grasp and replace it.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting the airtightness of a motorcycle engine housing, characterized in that, Includes a frame (1) and an engine housing (10). The frame (1) is provided with a base plate (2) and a top plate (4). The base plate (2) is provided with a lifting and positioning unit (3). The engine housing (10) is placed on top of the lifting and positioning unit (3). The top plate (4) is provided with an airtightness detection unit (5). Two second fixing plates (8) are symmetrically arranged on the frame (1). A cylinder (6) is arranged between the two second fixing plates (8). The cylinder (6) is connected to a mold closing unit (7). The mold closing unit (7) includes a right half mold body (71) and a left half mold body (72). The right half mold body (71) and the left half mold body (72) are respectively provided with cavities matching the engine housing (10) on opposite sides. A sealing blade (76) is provided between the right half mold (71) and the left half mold (72). The sealing blade (76) divides the interior of the engine housing (10) into at least two independent chambers (74). The airtightness detection unit (5) fills each independent chamber (74) with air and detects the pressure difference.

2. The motorcycle engine housing airtightness testing device according to claim 1, characterized in that, The sealing blade (76) includes a first sealing blade (761) and a second sealing blade (762). The first sealing blade (761) is disposed on the inner wall of the left half mold (72) and is attached to the inner wall of the engine housing (10). The second sealing blade (762) is fixedly connected to the inner walls of both the right half mold (71) and the left half mold (72). The second sealing blade (762) is attached to the outer wall of the engine housing (10). A locking block (763) is connected to one of the second sealing blades (762), and the locking block (763) engages with the other second sealing blade (762).

3. The motorcycle engine housing airtightness testing device according to claim 2, characterized in that, The engine housing (10) includes a shaft hole (101) and a sealing end face (102). The shaft hole (101) is located on the side of the engine housing (10) near the right half of the mold (71), and the sealing end face (102) is located on the side of the engine housing (10) near the left half of the mold (72). A sealing ring (711) is provided on the mating surface of the right half mold body (71) and the left half mold body (72). A sealing gasket (73) is fixedly connected to the inner wall of the right half mold body (71) and the left half mold body (72). The sealing gasket (73) provided on the inner wall of the right half mold body (71) is sealed to the sealing end face (102). The sealing gasket (73) provided on the inner wall of the left half mold body (72) is sealed to the shaft hole (101).

4. The motorcycle engine housing airtightness testing device according to claim 3, characterized in that, The right half mold (71) or the left half mold (72) is provided with a hole sealing rod (79) and a groove sealing block (78) in the cavity. The hole sealing rod (79) is inserted into the threaded hole of the engine housing (10), and the groove sealing block (78) fills the recess of the engine housing (10).

5. The motorcycle engine housing airtightness testing device according to claim 4, characterized in that, The right half mold (71) and the left half mold (72) are provided with unloading components (77). The unloading components (77) include a clamping plate (775) fixed to the inner wall of the mold. A rubber membrane (771) is connected to the clamping plate (775). A push plate (774) is connected to the rubber membrane (771). A telescopic cylinder (772) and a spring (773) are provided between the push plate (774) and the clamping plate (775). When separation is required, the spring (773) pushes the push plate (774) to push the engine housing (10) out of the cavity.

6. The motorcycle engine housing airtightness testing device according to claim 1, characterized in that, The airtightness detection unit (5) includes a high-pressure air source (51), which is fixedly connected to the top surface of the top plate (4). A flexible air pipe (52) is fixedly connected to the outlet end of the high-pressure air source (51). An inflation valve (53) is connected to the high-pressure air source (51) through the flexible air pipe (52). An air inlet pipe (54) is connected to the output end of the inflation valve (53). The air inlet pipe (54) is connected to each independent chamber (74) inside the right half mold body (71). The left half of the mold (72) is connected to an air vent pipe (55), and an air pressure sensor (56) is installed on the air vent pipe (55). An air release control valve is installed at the end of the air vent pipe (55) away from the left half of the mold (72).

7. The motorcycle engine housing airtightness testing device according to claim 1, characterized in that, The second fixing plate (8) is provided with a track unit (9), the track unit (9) includes a track plate (91), the track plate (91) is fixedly connected to one side between the two second fixing plates (8), and the track plate (91) is located above the right half mold (71) and the left half mold (72). The top of the right half mold (71) and the left half mold (72) are respectively provided with T-shaped plates (92), and two sets of symmetrical connecting rods (93) are fixedly connected on the T-shaped plates (92). Linear bearings (94) are fixedly connected to the surface of the connecting rods (93). The top surface of the track plate (91) is provided with a groove (95), and the linear bearings (94) slide in the groove (95) of the track plate (91).

8. The motorcycle engine housing airtightness testing device according to claim 1, characterized in that, The lifting and positioning unit (3) includes a hydraulic rod (32) fixed on the base plate (2). The output end of the hydraulic rod (32) is connected to a lifting and positioning plate (33). A positioning pin (34) is provided on the lifting and positioning plate (33). The positioning pin (34) fits against the recessed part of the engine housing (10).

9. The motorcycle engine housing airtightness testing device according to claim 8, characterized in that, The right half mold body (71) and the left half mold body (72) are respectively provided with guide post (710) and guide sleeve hole. The guide post (710) and the guide sleeve hole slide together and are used to limit the mold closing movement trajectory.

10. A motorcycle engine housing airtightness testing device according to claim 6, characterized in that, The number of intake pipes (54) corresponds one-to-one with the number of independent chambers (74), and the number of air pressure sensors (56) corresponds one-to-one with the number of independent chambers (74), used to independently detect the pressure drop of the crankcase chamber and the gearbox chamber respectively.

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