A detection and sealing integrated leak detection tool for a gearbox assembly rear body

Abstract

This utility model discloses an integrated leak testing and sealing fixture for the rear body of a transmission assembly, relating to the technical field of transmission assembly testing fixtures. It includes at least a pressure plate, an inflation rod, a positioning sleeve, and several hook-shaped bolt assemblies. The pressure plate has an annular groove, a triangular boss for detecting the size of the rear body stop, and a positioning sleeve mounting hole on its front side. A sealing ring is embedded in the annular groove. An inflation rod positioning hole and several hook-shaped bolt positioning holes are provided through the pressure plate, distributed along the edge of the pressure plate. Each hook-shaped bolt assembly corresponds one-to-one with a hook-shaped bolt positioning hole, and each hook-shaped bolt assembly includes a hook-shaped bolt, a bushing, and a nut. This utility model proposes an integrated leak testing and sealing fixture for the rear body of a transmission assembly that effectively combines rear body stop detection, model error prevention, and airtight sealing.

Description

Technical Field

[0001] This utility model relates to the field of gearbox assembly testing tooling technology, and in particular to an integrated testing and sealing leak test tooling for the rear body of a gearbox assembly. Background Technology

[0002] During the manufacturing process of transmission assemblies, leak testing is a crucial step in ensuring product sealing, preventing leaks, and guaranteeing service life. Simultaneously, the locating edge of the assembly's rear body, serving as the customer interface, requires 100% inspection before leaving the factory to avoid any omissions in the machining process. Current inspection methods typically rely on inspectors manually inspecting each assembly's rear body using plug gauges. However, due to the wide variety of rear body models compatible with transmission assemblies, and the varying locations of customer-specific pin holes on different models, inspectors must maintain a high level of concentration during inspection to confirm model matching and prevent mixing or batch errors during production. This manual inspection method is not only inefficient but also prone to errors and omissions due to fatigue or negligence, increasing the risk of defective products leaving the factory and impacting product quality and customer trust.

[0003] In leak testing, existing technologies often use cylinder clamping to seal the large end face of the assembly's rear body, followed by manual insertion of an inflation head for inflation testing. However, the assembly is often in a horizontal position during testing, and the tooling plate fixing the assembly may move due to production line movement, resulting in limited space, uneven pressure, or incomplete sealing during cylinder clamping. Furthermore, for safety reasons, cylinder clamping requires additional protective devices, but on-site space is often severely limited, restricting equipment layout and operational efficiency. These problems not only reduce the accuracy and reliability of testing but also increase equipment complexity, maintenance costs, and operational difficulty, impacting overall production efficiency. Therefore, there is an urgent need in the field for an integrated tooling that combines testing, error prevention, and sealing functions to solve the problems of low testing efficiency, large space occupation, and unstable sealing in existing technologies. Utility Model Content

[0004] In order to solve at least some of the problems existing in the prior art, this utility model proposes an integrated leak test fixture for the rear body inspection and sealing of the gearbox assembly that can effectively combine the inspection of the rear body stop, model error prevention and gas seal plugging, achieving a 100% inspection pass rate, saving space and improving testing stability and efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A leak test fixture for the rear body of a gearbox assembly that integrates inspection and sealing, comprising at least a pressure plate, an inflation rod, a positioning sleeve, and several hook-type bolt assemblies; The front side of the pressure plate is provided with an annular groove, a triangular boss for detecting the size of the rear body stop of the gearbox assembly, and a positioning sleeve mounting hole; a sealing ring is embedded in the annular groove, the triangular boss and the positioning sleeve mounting hole are both located inside the annular groove, the positioning sleeve mounting hole is a countersunk hole, and one end of the positioning sleeve is fixed in the positioning sleeve mounting hole. The pressure plate has a through-hole for an inflatable rod and several hook-shaped bolt positioning holes. The front opening of the inflatable rod positioning hole is located inside the annular groove. The front end of the inflatable rod is inserted and fixed into the inflatable rod positioning hole from the rear opening of the positioning hole. The inflatable rod and the positioning hole are sealed together. The inflatable rod has a through-hole inflation channel. The front end of the inflation channel is connected to the front side of the pressure plate, and a quick-connect air hose is installed at the rear end of the inflation channel. Several hook-shaped bolt positioning holes are distributed on the edge of the pressure plate. At each location, the hook bolt assembly corresponds one-to-one with the hook bolt positioning hole. Each hook bolt assembly includes a hook bolt, a bushing, and a nut. One end of the bushing has an annular flange on its outer wall. The outer diameter of the bushing matches the diameter of the hook bolt positioning hole. The bushing is inserted into the hook bolt positioning hole, and the annular flange abuts against the rear side of the pressure plate. The front end of the hook bolt is a hook, and the rear end is a threaded post. The threaded post extends from the front end of the bushing and passes through the inner hole of the bushing. The nut is screwed onto the tail end of the threaded post.

[0006] By adopting the above technical solution: the pressure plate achieves a reliable seal with the rear end face of the gearbox assembly through the annular groove and sealing ring, and the triangular boss is used to quickly detect the stop size to ensure that it meets customer requirements; at the same time, the hook bolt assembly replaces the traditional cylinder clamping, and the hook part is used to fix the rear body of the assembly, avoiding space constraints and pressure deviation problems, realizing the integrated operation of detection, error prevention and sealing, and improving the test accuracy and efficiency.

[0007] Preferably, the outer side of the inflatable rod is provided with a flange, the flange is provided with several through holes in the circumferential direction, and the rear side of the pressure plate is provided with several threaded holes corresponding to the through holes on the flange. Bolts pass through the through holes on the flange and are screwed into the threaded holes on the pressure plate for fixation. The flange and the pressure plate are fixed together by bolts.

[0008] Preferably, an oil seal positioning groove is provided at the rear opening of the positioning hole of the air rod, and an oil seal is provided in the oil seal positioning groove. The oil seal is sleeved on the air rod and has a rotational sealing fit with the air rod. The front and outer sides of the oil seal abut against the two walls of the oil seal positioning groove, respectively, and the rear side of the oil seal abuts against the flange.

[0009] Preferably, the hook bolt assembly and the hook bolt positioning hole both have three holes.

[0010] Preferably, the front side of the pressure plate is provided with several pin holes, which correspond to the pin hole positions on the rear body of different gearbox assemblies. Pins are fixed in the corresponding pin holes according to the model of the gearbox assembly to be tested.

[0011] Preferably, the side wall of the pressure plate is provided with a set screw hole that connects to the inner wall of the hook bolt positioning hole, and a set screw is provided in the set screw hole. The outer side wall of the bushing is provided with a groove for the set screw to be clamped and positioned.

[0012] This utility model has the following beneficial effects: 1. By integrating stop detection, model error prevention, and leak testing functions, it achieves 100% inspection and prevents unqualified products from leaving the site; 2. By using hook bolts instead of cylinder clamping, it saves space, avoids problems of uneven or insufficient clamping, and improves sealing reliability and testing efficiency; 3. It has a simple structure, is easy to operate, and is adaptable to various models. Adjustable pins and set screws enhance its versatility and stability; 4. The dual sealing design of oil seal and sealing ring ensures accurate leak testing and reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention.

[0014] Figure 2 This is the front view of the pressure plate of this utility model.

[0015] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0016] Figure 4 This is a cross-sectional view of the inflatable rod in this utility model.

[0017] Figure 5 This is the front view of the hook-shaped bolt in this utility model.

[0018] Figure 6 This is a cross-sectional view of the bushing in this utility model.

[0019] 1: Pressure plate; 101: Annular groove; 102: Triangular boss; 103: Positioning sleeve mounting hole; 104: Sealing ring; 105: Inflator rod positioning hole; 106: Hook bolt positioning hole; 107: Oil seal positioning groove; 108: Pin hole; 109: Set screw hole; 2: Inflator rod; 201: Inflator channel; 202: Air hose quick connector; 203: Flange; 3: Positioning sleeve; 4: Hook bolt; 401: Hook; 402: Threaded post; 5: Bushing; 501: Annular flange; 502: Groove; 6: Nut; 7: Oil seal; 8: Gearbox assembly. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] A leak testing fixture integrating inspection and sealing of the rear body of a gearbox assembly, see [link / reference]. Figures 1 to 6 It includes at least one pressure plate 1, one inflatable rod 2, one positioning sleeve 3, and three hook bolt assemblies.

[0022] The front side of the pressure plate 1 is provided with an annular groove 101, a triangular boss 102 for detecting the size of the rear stop of the gearbox assembly 8, and a positioning sleeve mounting hole 103. A sealing ring 104 is embedded in the annular groove 101. The triangular boss 102 and the positioning sleeve mounting hole 103 are both located inside the annular groove 101. The positioning sleeve mounting hole 103 is a countersunk hole, and one end of the positioning sleeve 3 is fixed in the positioning sleeve mounting hole 103. When the leak testing fixture is fitted and installed with the gearbox assembly 8, the positioning of a point is completed by inserting the positioning sleeve 3 into the corresponding hole in the gearbox assembly 8.

[0023] The pressure plate 1 has a through-hole 105 for an inflation rod and three hook bolt positioning holes 106. The front opening of the inflation rod positioning hole 105 is located inside the annular groove 101. The front end of the inflation rod 2 is inserted and fixed into the inflation rod positioning hole 105 from the rear opening of the inflation rod positioning hole 105. The inflation rod 2 and the inflation rod positioning hole 105 are sealed and fixed. Specifically, the outer side of the inflation rod 2 is provided with a flange 203. The flange 203 has six through holes evenly spaced around its circumference. The rear side of the pressure plate 1 is provided with six threaded holes corresponding to the through holes on the flange 203. Bolts pass through the through holes on the flange 203 and are screwed into the threaded holes on the pressure plate 1 for fixation. The flange 203 and the pressure plate 1 are fixed together by bolts. An oil seal positioning groove 107 is provided at the rear opening of the positioning hole 105 of the inflation rod. An oil seal 7 is provided in the oil seal positioning groove 107. The oil seal 7 is sleeved on the inflation rod 2 and is rotated and sealed with the inflation rod 2. The front and outer sides of the oil seal 7 abut against the two walls of the oil seal positioning groove 107, respectively, and the rear side of the oil seal 7 abuts against the flange 203. An inflation rod 2 has a through inflation channel 201. The front end of the inflation channel 201 is connected to the front side of the pressure plate 1, and a quick-connect air hose 202 is installed at the rear end of the inflation channel 201. Three hook bolt positioning holes 106 are distributed at the edge of the pressure plate 1. The hook bolt assembly corresponds one-to-one with the hook bolt positioning hole 106. Each hook bolt assembly includes a hook bolt 4, a bushing 5, and a nut 6. One end of the bushing 5 has an annular flange 501 on its outer wall. The outer diameter of the bushing 5 matches the diameter of the hook bolt positioning hole 106. The bushing 5 is inserted into the hook bolt positioning hole 106, and the annular flange 501 abuts against the rear side of the pressure plate 1. The front end of the hook bolt 4 is a hook 401, and the rear end is a threaded post 402. The threaded post 402 extends from the front end of the bushing 5 and passes through the inner hole of the bushing 5. The nut 6 is screwed into the tail end of the threaded post. The side wall of the pressure plate 1 is provided with a set screw hole 109 that connects to the inner wall of the hook bolt positioning hole 106. A set screw is provided in the set screw hole 109. The outer wall of the bushing 5 is provided with a groove 502 for the set screw to be clamped and positioned.

[0024] In the above structure, the pressure plate 1 forms a reliable seal with the rear end face of the gearbox assembly through the sealing ring 104. The triangular boss 102 is used to quickly detect the stop size to ensure that it meets customer requirements. At the same time, the rear body of the assembly is fixed by the hook part 401 of the hook bolt assembly, which replaces the traditional cylinder clamping and avoids the pressure deviation problem caused by space constraints and tooling plate movement. This enables simultaneous detection, error prevention and sealing, and improves testing accuracy and production efficiency.

[0025] The front side of the pressure plate 1 is provided with several pin holes 108, which correspond to the pin hole positions on the rear body of different gearbox assemblies. A pin is fixed in the corresponding pin hole 108 according to the model of the gearbox assembly to be tested. In this structure, the pin holes 108 and the pins are used for model identification and error prevention of the assembly rear body; only the correct model assembly rear body can be matched and installed with the pin. Simultaneously, the pin positioning ensures accurate alignment between the tooling and the assembly rear body, preventing material mixing and misoperation, improving testing reliability, and reducing the risk of human error.

[0026] The working principle of this utility model is as follows: During the testing process, firstly, according to the model of the assembly to be tested, a pin is inserted into the corresponding pin hole 108 to verify model matching and prevent mixing; then, the front side of the pressure plate 1 is aligned with the end face of the rear body of the gearbox assembly, and preliminary positioning is achieved through the positioning sleeve 3 to ensure that the tooling is aligned with the rear body of the assembly; next, the hook part 401 of the hook bolt 4 is used to hook the edge structure of the rear body of the gearbox assembly 8, and the nut 6 is tightened so that the pressure plate 1 forms a tight seal with the large end face of the rear body of the gearbox assembly 8 through the sealing ring 104; the quick connector 202 of the air pipe is connected to an external air source, and gas is injected into the rear body of the assembly through the air inflation channel 201 to conduct a leak test and detect whether there is a leak. At the same time, when the triangular boss 102 contacts the stop of the rear body of the gearbox assembly 8, it can quickly detect whether the stop of the rear body of the assembly is unprocessed or does not meet the standard. Throughout the process, the tooling integrates testing, error prevention, and sealing functions. It is easy to operate, saves space, and uses hook-type bolts instead of traditional cylinders, avoiding space constraints and pressure misalignment issues, ensuring accurate and efficient testing. The pin-based error prevention mechanism eliminates model errors, achieving a 100% pass rate. It is suitable for various models and production conditions, improving overall production efficiency and quality control.

Claims

1. A leak testing fixture integrating inspection and sealing of the rear body of a gearbox assembly, characterized in that: It includes at least a pressure plate (1), an inflation rod (2), a positioning sleeve (3), and several hook bolt assemblies; The front side of the pressure plate (1) is provided with an annular groove (101), a triangular boss (102) for detecting the size of the rear body stop of the gearbox assembly, and a positioning sleeve mounting hole (103); a sealing ring (104) is embedded in the annular groove (101), the triangular boss (102) and the positioning sleeve mounting hole (103) are both located inside the annular groove (101), the positioning sleeve mounting hole (103) is a countersunk hole, and one end of the positioning sleeve (3) is fixed in the positioning sleeve mounting hole (103); The pressure plate (1) is provided with an inflation rod positioning hole (105) and several hook bolt positioning holes (106). The front opening of the inflation rod positioning hole (105) is located inside the annular groove (101). The front end of the inflation rod (2) is inserted and fixed in the inflation rod positioning hole (105) from the rear opening of the inflation rod positioning hole (105). The inflation rod (2) and the inflation rod positioning hole (105) are sealed and fixed. The inflation rod (2) is provided with a through inflation channel (201). The front end of the inflation channel (201) is connected to the front side of the pressure plate (1). A quick-connect air pipe connector (202) is installed at the rear end of the inflation channel (201). Several hook bolt positioning holes (106) are distributed on the pressure plate (101). At the edge, the hook bolt assembly corresponds one-to-one with the hook bolt positioning hole (106). Each hook bolt assembly includes a hook bolt (4), a bushing (5) and a nut (6). The outer wall of one end of the bushing (5) is provided with an annular flange (501). The outer diameter of the bushing (5) matches the diameter of the hook bolt positioning hole (106). The bushing (5) is inserted into the hook bolt positioning hole (106), and the annular flange (501) abuts against the rear side of the pressure plate (1). The front end of the hook bolt (4) is a hook (401), and the rear end is a threaded post (402). The threaded post (402) extends from the front end of the bushing (5) and passes through the inner hole of the bushing (5). The nut (6) is screwed into the tail of the threaded post.

2. The integrated leak testing and sealing fixture for the rear body of a gearbox assembly according to claim 1, characterized in that: The outer side of the inflatable rod (2) is provided with a flange (203). The flange (203) has several through holes in the circumferential direction. The rear side of the pressure plate (1) is provided with several threaded holes corresponding to the through holes on the flange (203). Bolts pass through the through holes on the flange (203) and are screwed into the threaded holes on the pressure plate (1) for fixation. The flange (203) and the pressure plate (1) are fixed together by bolts.

3. The integrated leak testing and sealing fixture for the rear body of a gearbox assembly according to claim 2, characterized in that: An oil seal positioning groove (107) is provided at the rear opening of the positioning hole (105) of the air rod. An oil seal (7) is provided in the oil seal positioning groove (107). The oil seal (7) is sleeved on the air rod (2) and is rotated and sealed with the air rod (2). The front and outer sides of the oil seal (7) abut against the two walls of the oil seal positioning groove (107) respectively, and the rear side of the oil seal (7) abuts against the flange (203).

4. The integrated leak testing and sealing fixture for the rear body of a gearbox assembly according to claim 1, characterized in that: The number of hook bolt assemblies and hook bolt positioning holes (106) are both three.

5. The integrated leak testing and sealing fixture for the rear body of a gearbox assembly according to claim 1, characterized in that: The front side of the pressure plate (1) is provided with several pin holes (108). The pin holes (108) correspond to the pin hole positions on the rear body of different gearbox assemblies. The pin is fixed in the corresponding pin hole (108) according to the model of the gearbox assembly to be tested.

6. The integrated leak testing and sealing fixture for the rear body of a gearbox assembly according to claim 1, characterized in that: The side wall of the pressure plate (1) is provided with a set screw hole (109) that connects to the inner wall of the hook bolt positioning hole (106). The set screw is provided in the set screw hole (109). The outer wall of the bushing (5) is provided with a groove (502) for the set screw to be clamped and positioned.

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