Plug for air tightness detection of steering gear

Abstract

This utility model discloses a plug for testing the air tightness of a steering gear, comprising a drive rod, a plug cover, a valve core, and a housing. The drive rod is rotatably mounted on the top surface of the plug cover. One end of the valve core passes through the plug cover and is rotatably connected to the drive rod, while the other end of the valve core is movably disposed inside the housing. One end of the housing is fixedly connected to the plug cover, and the other end of the housing has a radially inwardly extending annular plate. The inner wall of the housing has a sealing ring that abuts against the annular plate. The sealing ring movably abuts against the valve core, and when the drive rod is pressed down, the sealing ring, after being compressed and expanded, forms a sealing structure that tightly seals the outer peripheral wall of the vent valve. The sealing ring is made of materials such as rubber or silicone. When the drive rod is pressed, the drive rod drives the valve core to move towards the vent valve, causing the valve core to contact and compress the sealing ring. The sealing ring is restricted by the annular plate and the inner wall of the housing, and deforms under force to tightly grip the outer peripheral wall of the vent valve, thereby achieving a sealing effect by tightly gripping the outer ring of the vent valve, facilitating the air tightness testing of the steering gear.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, specifically to a plug for airtightness testing of steering gears. Background Technology

[0002] In the field of electric power steering manufacturing, rack and pinion electric power steering systems, because they are directly installed under the car chassis and are exposed to complex environments such as rain and mud for extended periods, require rigorous airtightness testing of the steering gear housing during production to ensure product reliability. This involves injecting dry air into the sealed cavity and monitoring the air pressure leakage within a specified time to determine whether the sealing performance meets the standards. Modern power steering systems generally use an integrated motor controller with a vent valve on the top of its housing. This component uses a built-in microporous filter membrane to allow free airflow while blocking moisture. However, the outer wall of this vent valve is a smooth cylindrical surface without a sealing groove structure, posing a unique challenge to airtightness testing. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model proposes a plug for testing the air tightness of a steering gear. The sealing ring is constrained by the annular plate and the inner wall of the housing, and deforms under force to hug the outer peripheral wall of the vent valve, thereby hugging the outer ring of the vent valve to achieve a sealing effect.

[0004] The technical solution adopted by this utility model is as follows: A plug for air tightness testing of a steering gear includes a drive rod, a plug, a valve core, and a housing. The drive rod is rotatably mounted on the top surface of the plug. One end of the valve core passes through the plug and is rotatably connected to the drive rod. The other end of the valve core is movably disposed inside the housing. One end of the housing is fixedly connected to the plug. The other end of the housing is provided with a radially inwardly extending annular plate. The inner wall of the housing is provided with a sealing ring that abuts against the annular plate. The sealing ring abuts against the valve core. When the drive rod is pressed down, the sealing ring, after being squeezed and expanded, forms a sealing structure that tightly seals the outer peripheral wall of the vent valve.

[0005] Optionally, the drive rod includes a cam block and a rod body. One end of the cam block is fixedly connected to a rotating shaft, and the other end of the cam block is fixedly connected to the rod body. The plug has a through hole for the valve core to pass through. The valve core passes through the through hole and is connected to the rotating shaft. The bottom surface of the cam block movably abuts against the top surface of the plug. The diameter of the through hole is smaller than the length of the rotating shaft.

[0006] Optionally, the bottom surface of the cam block is provided with an inclined surface, the outer peripheral wall of the valve core is fitted with a spring, and a block is provided at the end of the valve core away from the plug, with one end of the spring abutting against the plug and the other end of the spring abutting against the block.

[0007] Optionally, the cam block includes a first protrusion and a second protrusion arranged in parallel, with a gap between the first protrusion and the second protrusion, the rotating shaft passing through the first protrusion and the second protrusion, and the top of the valve core located within the gap and rotatably connected to the rotating shaft.

[0008] Optionally, the first protrusion and the second protrusion are fixed by a connecting plate, and the rod is fixed to the connecting plate; the bottom surface of the first protrusion and the bottom surface of the second protrusion are both provided with the inclined surface.

[0009] Optionally, the valve core includes a first valve stem and a second valve stem. The first valve stem passes through a through hole and is rotatably connected to a rotating shaft. The second valve stem is provided with the plug. The diameter of the second valve stem is smaller than the diameter of the through hole, and the cross-sectional shape of the first valve stem matches the through hole.

[0010] Optionally, the plug has a protrusion on the side facing the valve core, and the end of the spring near the plug is sleeved on the outer periphery of the protrusion.

[0011] Optionally, the plug has a plurality of first screw holes evenly distributed around its circumference, and the end of the housing has a second screw hole coaxial with the first screw holes.

[0012] The beneficial effects of this utility model are: the sealing ring is made of rubber or silicone, etc. When the driving rod is pressed, the driving rod drives the valve core to move towards the vent valve, so that the valve core contacts and squeezes the sealing ring. The sealing ring is restricted by the annular plate and the inner wall of the housing, and deforms under force to hug the outer peripheral wall of the vent valve, thereby hugging the outer ring of the vent valve to achieve a sealing effect, which facilitates the air tightness test of the steering gear. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the plug for testing the air tightness of the steering gear according to an embodiment of the present invention;

[0014] Figure 2 This is an exploded view of the plug for airtightness testing of the steering gear proposed in an embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the annular plate of the plug for airtightness testing of the steering gear according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the vent valve of the steering gear according to an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of the vent valve and plug of the steering gear according to an embodiment of the present invention.

[0018] The labels in the attached figures are as follows: 1. Drive rod; 11. Cam block; 111. Inclined surface; 112. First protrusion; 113. Second protrusion; 12. Rod body; 13. Rotating shaft; 14. Connecting plate; 2. Plug; 21. Through hole; 22. Protrusion; 23. First screw hole; 3. Valve core; 31. First valve stem; 32. Second valve stem; 33. Plug; 4. Housing; 41. Annular plate; 42. Second screw hole; 5. Sealing ring; 6. Spring; 7. Vent valve; 8. Motor. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 5 As shown, this embodiment discloses a plug for testing the air tightness of a steering gear, including a drive rod 1, a plug 2, a valve core 3, and a housing 4. The drive rod 1 is rotatably mounted on the top surface of the plug 2. One end of the valve core 3 passes through the plug 2 and is rotatably connected to the drive rod 1. The other end of the valve core 3 is movably disposed inside the housing 4. One end of the housing 4 is fixedly connected to the plug 2. The other end of the housing 4 is provided with a radially inwardly extending annular plate 41. The inner wall of the housing 4 is provided with a sealing ring 5 that abuts against the annular plate 41. The sealing ring 5 abuts against the valve core 3. When the drive rod 1 is pressed down, the sealing ring 5, after being squeezed and expanded, forms a sealing structure that tightly seals the outer peripheral wall of the vent valve 7. The sealing ring 5 is made of rubber or silicone. Pressing the drive rod 1 causes the valve core 3 to move towards the vent valve 7, making the valve core 3 contact and squeeze the sealing ring 5. The sealing ring 5 is restricted by the annular plate 41 and the inner wall of the housing 4, and deforms under force to hug the outer peripheral wall of the vent valve 7, thereby achieving a sealing effect by hugging the outer ring of the vent valve 7, which facilitates the airtightness test of the steering gear. The diameter of the sealing ring 5 is not less than the diameter of the annular plate 41.

[0021] like Figure 1 and 2 As shown, the drive rod 1 in this embodiment includes a cam block 11 and a rod body 12. One end of the cam block 11 is fixedly connected to a rotating shaft 13, and the other end of the cam block 11 is fixedly connected to the rod body 12. The plug 2 has a through hole 21 for the valve core 3 to pass through. The valve core 3 passes through the through hole 21 and is connected to the rotating shaft 13. The bottom surface of the cam block 11 movably abuts against the top surface of the plug 2. The diameter of the through hole 21 is smaller than the length of the rotating shaft 13. The through hole 21 limits the movement of the drive rod 1.

[0022] like Figure 1 and 2As shown, in this embodiment, the bottom surface of the cam block 11 is provided with an inclined surface 111, the outer peripheral wall of the valve core 3 is fitted with a spring 6, and the end of the valve core 3 away from the plug 2 is provided with a plug block 33. One end of the spring 6 abuts against the plug 2, and the other end of the spring 6 abuts against the plug block 33. The plug block 33 is an annular plug block 33, which compresses the sealing ring 5 and seals the vent valve 7. When the rod 12 is pushed, it causes the cam block 11 to rotate, so that the inclined surface 111 faces the plug 2. The pressure of the plug 2 disappears, the spring 6 returns to its original position, the valve core 3 moves upward, the compressive force of the sealing ring 5 disappears, and the seal on the vent valve 7 is released.

[0023] like Figure 2 As shown, the cam block 11 in this embodiment includes a first protrusion 112 and a second protrusion 113 arranged in parallel. A gap exists between the first protrusion 112 and the second protrusion 113. The rotating shaft 13 passes through the first protrusion 112 and the second protrusion 113. The top end of the valve core 3 is located within the gap and is rotatably connected to the rotating shaft 13. The first protrusion 112 and the second protrusion 113 provide a stable rotation space for the valve core 3, preventing motion interference. The first protrusion 112 and the second protrusion 113 are fixed by a connecting plate 14, and the rod body 12 is fixed to the connecting plate 14. The bottom surface of both the first protrusion 112 and the bottom surface of the second protrusion 113 are provided with the inclined surface 111.

[0024] like Figure 2 As shown, the valve core 3 includes a first valve stem 31 and a second valve stem 32. The first valve stem 31 passes through a through hole 21 and is rotatably connected to the rotating shaft 13. The second valve stem 32 is provided with the plug 33. The diameter of the second valve stem 32 is smaller than the diameter of the through hole 21, and the cross-sectional shape of the first valve stem 31 matches the through hole 21. The cross-section of the first valve stem 31 can be circular, rectangular, or other shapes, and the shape of the through hole 21 matches the through hole 21.

[0025] like Figure 2 As shown, in this embodiment, the plug 2 has a protrusion 22 on the side facing the valve core 3, and the end of the spring 6 near the plug 2 is sleeved on the outer periphery of the protrusion 22. The cross-section of the protrusion 22 is circular, which limits the initial position of the spring 6, prevents radial displacement during compression, and ensures the straightness of the movement trajectory of the valve core 3.

[0026] like Figure 2 As shown, the plug 2 has several first screw holes 23 evenly distributed around its circumference, and the end of the housing 4 has a second screw hole 42 coaxial with the first screw holes 23. Bolts pass through the first screw holes 23 and the second screw holes 42 to achieve a fixed connection, which facilitates the disassembly and maintenance of the sealing ring 5.

[0027] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A plug for testing the air tightness of a steering gear, characterized in that, The device includes a drive rod, a plug, a valve core, and a housing. The drive rod is rotatably mounted on the top surface of the plug. One end of the valve core passes through the plug and is rotatably connected to the drive rod. The other end of the valve core is movably disposed inside the housing. One end of the housing is fixedly connected to the plug. The other end of the housing is provided with a radially inwardly extending annular plate. The inner wall of the housing is provided with a sealing ring that abuts against the annular plate. The sealing ring abuts against the valve core. When the drive rod is pressed down, the sealing ring, after being squeezed and expanded, forms a sealing structure that tightly seals the outer peripheral wall of the vent valve.

2. The plug for testing the air tightness of a steering gear according to claim 1, characterized in that, The drive rod includes a cam block and a rod body. One end of the cam block is fixedly connected to a rotating shaft, and the other end of the cam block is fixedly connected to the rod body. The plug has a through hole for the valve core to pass through. The valve core passes through the through hole and is connected to the rotating shaft. The bottom surface of the cam block and the top surface of the plug body move against each other. The diameter of the through hole is smaller than the length of the rotating shaft.

3. The plug for testing the air tightness of a steering gear according to claim 2, characterized in that, The bottom surface of the cam block is provided with an inclined surface, the outer peripheral wall of the valve core is fitted with a spring, and the end of the valve core away from the plug is provided with a plug block. One end of the spring abuts against the plug cover, and the other end of the spring abuts against the plug block.

4. The plug for testing the air tightness of a steering gear according to claim 3, characterized in that, The cam block includes a first protrusion and a second protrusion arranged in parallel, with a gap between the first protrusion and the second protrusion. The rotating shaft passes through the first protrusion and the second protrusion, and the top of the valve core is located within the gap and is rotatably connected to the rotating shaft.

5. The plug for testing the air tightness of a steering gear according to claim 4, characterized in that, The first protrusion and the second protrusion are fixed by a connecting plate, and the rod is fixed to the connecting plate; the bottom surface of the first protrusion and the bottom surface of the second protrusion are both provided with the inclined surface.

6. The plug for testing the air tightness of a steering gear according to claim 2, characterized in that, The valve core includes a first valve stem and a second valve stem. The first valve stem passes through a through hole and is rotatably connected to a rotating shaft. The second valve stem is provided with the plug. The diameter of the second valve stem is smaller than the diameter of the through hole, and the cross-sectional shape of the first valve stem matches the through hole.

7. The plug for testing the air tightness of a steering gear according to claim 3, characterized in that, The plug has a protrusion on the side facing the valve core, and the end of the spring near the plug is sleeved on the outer periphery of the protrusion.

8. The plug for testing the air tightness of a steering gear according to claim 1, characterized in that, The plug has a plurality of first screw holes evenly distributed around its circumference, and the end of the housing has a second screw hole that is coaxial with the first screw holes.

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