Gearbox shell airtightness detection tool

Abstract

This utility model provides a gearbox housing airtightness testing fixture, including a two-position feeding mechanism and a pressing mechanism. The two-position feeding mechanism includes several slides for supporting the gearbox housing and several drive units for driving the slides to perform reciprocating linear motion. The pressing mechanism includes several columns, with a top plate at the top of each column. A hydraulic cylinder is mounted above the top plate, and the piston rod of the hydraulic cylinder passes through the top plate and connects to a pressing plate slidably mounted on the column. Several pressing rods for pressing the gearbox housing are mounted on the bottom surface of the pressing plate. When performing airtightness testing on the gearbox housing, the parts to be tested can be prepared simultaneously, which helps to reduce the gap between processes and improve testing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of airtightness testing of gearbox housings, and in particular to a tooling for airtightness testing of gearbox housings. Background Technology

[0002] In the transmission manufacturing process, housing airtightness testing is an indispensable core pre-processing step before assembly. As the "skeleton" of the transmission, the housing's sealing performance directly determines whether the internal transmission mechanism and hydraulic system can operate stably in a leak-free environment. If there are even tiny pores or gaps in the transmission housing, it will not only lead to lubricating oil leakage and hydraulic pressure loss, but may also cause serious malfunctions such as accelerated gear wear and delayed shift response. Therefore, it is essential to screen out unqualified parts in advance through rigorous airtightness testing to avoid quality risks in subsequent assembly stages from the source.

[0003] Chinese patent CN205981586U discloses a gearbox leak testing machine, including a workstation. The workstation includes a base, a frame, a work platform, an air inlet, a feed cylinder, and a pressure gauge. The work platform is equipped with clamping cylinders arranged horizontally in a cross shape around its perimeter. A main cylinder is located at the top of the work platform. A guide seat is fixed by the frame, and a guide rod is nested in the guide seat. A connecting plate is fixedly connected to the top of the guide rod. The push rod of the main cylinder is fixedly connected to the connecting plate via a coupling. Multiple inner-bore expansion cylinders are arranged below the connecting plate. The push rod of the clamping cylinder is equipped with an elastic clamp at its end. The inner-bore expansion cylinders are connected to the pressure gauge.

[0004] When the gearbox leak tester is working, it seals the oil passage by expanding the cylinder in the inner bore, and then injects compressed air into one of the oil passages through the air inlet and maintains the pressure. By observing the pressure change in the pressure gauge, it achieves efficient testing of the gearbox's sealing performance, avoids environmental pollution caused by the use of hydraulic oil, and reduces testing costs.

[0005] During gearbox leak testing, the machine cannot simultaneously perform material preparation. Specifically, the work platform is occupied by the current workpiece during testing, preventing workers from pre-processing the next workpiece to be inspected, resulting in significant gaps between processes and reduced testing efficiency. Utility Model Content

[0006] The present invention aims to address the aforementioned shortcomings in the prior art by providing a gearbox housing airtightness testing fixture, which solves the problem of low testing efficiency in the prior art.

[0007] The above-mentioned utility model objective is achieved through the following technical solution: a gearbox housing airtightness testing fixture, including a two-position feeding mechanism and a pressing mechanism. The two-position feeding mechanism includes several slides for supporting the gearbox housing and several drive units for driving the slides to perform reciprocating linear motion. The pressing mechanism includes several columns, a top plate is provided on the top of the columns, a hydraulic cylinder is provided above the top plate, the piston rod of the hydraulic cylinder passes through the top plate and is connected to a pressing plate slidably disposed on the column, and several pressing rods for pressing the gearbox housing are provided on the bottom surface of the pressing plate.

[0008] The present invention is further configured such that: the driving unit includes a fixed base, a driven block slidably disposed on the fixed base and connected to the bottom surface of the slide table, and a driving component for driving the driven block to perform reciprocating linear motion is disposed on the fixed base.

[0009] The present invention is further configured such that: a linear slide rail is provided on the top surface of the fixed base, and a plurality of linear sliders are slidably arranged on the linear slide rail, and the driven block is arranged on the linear sliders.

[0010] The present invention is further configured such that: the driving assembly includes a motor frame and a pulley frame mounted on a fixed base; the motor frame has a first through-shaft hole along the thickness direction; a drive motor is mounted on the bottom surface of the motor frame; the output shaft of the drive motor passes through the first through-shaft hole and is coaxially mounted with a drive pulley; the pulley frame has a second through-shaft hole along the thickness direction; a driven shaft is rotatably mounted in the second through-shaft hole; a driven pulley is coaxially mounted on the top of the driven shaft; a drive belt is belt-driven between the driven pulley and the drive pulley; and the drive belt is connected to the driven block.

[0011] The present invention is further configured such that: a cassette groove is provided on the bottom surface of the driven block, and the drive belt is connected to the driven block by embedding into the cassette groove.

[0012] The present invention is further configured such that: a plurality of bearing grooves are provided on the pulley frame, and a driven bearing is interference-fitted into the bearing groove, and the driven bearing is mounted on the driven shaft.

[0013] The present invention is further provided with a sealing gasket on the top surface of the slide table.

[0014] The present invention is further configured such that the sealing gasket is made of rubber.

[0015] The present invention is further configured such that a column base is provided at the bottom of the column.

[0016] The present invention is further configured such that: a linear bearing is slidably disposed on the column, and the linear bearing is disposed on the bottom surface of the pressure plate.

[0017] In summary, the beneficial technical effects of this utility model are as follows: when the airtightness testing of the gearbox housing is performed, the test piece can be prepared simultaneously, which helps to reduce the gap between processes and improve testing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the gearbox housing airtightness testing fixture in this utility model; Figure 2 This is a schematic diagram of the drive unit in this utility model; Figure 3 This is a partial cross-sectional view of the structural schematic diagram of this utility model; Figure 4 This is a schematic diagram of the driven block and the drive belt in this utility model.

[0019] In the above figures: 1. Double-position feeding mechanism; 2. Pressing box mechanism; 3. Slide table; 4. Drive unit; 5. Fixed base; 6. Linear slide rail; 7. Linear slider; 8. Driven block; 9. Belt slot; 10. Motor frame; 11. First through-shaft hole; 12. Drive motor; 13. Drive pulley; 14. Pulley frame; 15. Second through-shaft hole; 16. Driven shaft; 17. Driven pulley; 18. Drive belt; 19. Bearing groove; 20. Driven bearing; 21. Sealing gasket; 22. Column; 23. Column base; 24. Top plate; 25. Hydraulic cylinder; 26. Pressing plate; 27. Linear bearing; 28. Press rod. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, this utility model proposes a gearbox housing airtightness testing fixture, including a dual-position feeding mechanism 1 and a pressing mechanism 2.

[0022] like Figure 1 As shown, the dual-position feeding mechanism 1 is used to alternately transport the gearbox housing to the detection position. The dual-position feeding mechanism 1 includes several slides 3 for carrying the gearbox housing and several drive units 4 for driving the slides 3 to perform reciprocating linear motion.

[0023] like Figure 2 and 4As shown, in this embodiment, there are two drive units 4. Each drive unit 4 includes a fixed base 5, which is screwed to the ground of the factory area. A linear slide rail 6 is screwed to the top surface of the fixed base 5. Four linear sliders 7 are slidably mounted on the linear slide rail 6. A driven block 8 is screwed to the linear slider 7. A cartridge groove 9 is provided on the bottom surface of the driven block 8.

[0024] like Figure 2 As shown, the fixed base 5 is provided with a drive assembly for driving the driven block 8 to perform reciprocating linear motion. The drive assembly includes a motor frame 10 and a pulley frame 14, which are screwed to both ends of the fixed base 5.

[0025] like Figure 1 As shown, the motor frame 10 has a first through-shaft hole 11 along the thickness direction. The drive motor 12 is screwed to the bottom surface of the motor frame 10. The output shaft of the drive motor 12 passes through the first through-shaft hole 11 and is coaxially arranged with a drive pulley 13.

[0026] like Figure 2 and 3 As shown, the pulley frame 14 has a second through-shaft hole 15 along the thickness direction. A driven shaft 16 is rotatably arranged in the second through-shaft hole 15. A driven pulley 17 is coaxially arranged on the top of the driven shaft 16. A drive belt 18 is belt-driven between the driven pulley 17 and the driving pulley 13. The drive belt 18 is connected to four driven blocks 8 by embedding in the belt slot 9.

[0027] like Figure 3 As shown, the pulley frame 14 has two bearing grooves 19, which are located at both ends of the second through shaft hole 15. Each bearing groove 19 is interference-fitted with a driven shaft 16 bearing, and the two driven shaft 16 bearings are fitted onto the driven shaft 16. The driven shaft 16 bearings are used to support the rotation of the driven shaft 16.

[0028] like Figure 1 As shown, in this embodiment, there are two slides 3. A rubber sealing gasket 21 is placed on the top surface of the slide 3. When the gearbox housing is placed on the sealing gasket 21, the sealing gasket 21 can better seal the downward opening of the gearbox housing, and to a certain extent restrict the gas from escaping from the gap between the sealing gasket 21 and the gearbox housing. The slides 3 and the sealing gasket 21 are respectively screwed to two adjacent driven blocks 8 in the drive unit 4. The sealing gasket 21 is easy to disassemble and replace.

[0029] like Figure 1As shown, the gearbox mechanism 2 includes four rectangular columns 22. Column bases 23 are fixedly connected to the bottom of each column 22, and the column bases 23 are screwed to the ground of the factory area. A top plate 24 is fixedly connected to the top of each column 22. A hydraulic cylinder 25 is fixedly installed above the top plate 24. The piston rod of the hydraulic cylinder 25 passes through the top plate 24 and is fixedly connected to a pressure plate 26, which is slidably mounted on the four columns 22. A linear bearing 27 is slidably mounted on each column 22, and the linear bearing 27 is screwed to the bottom surface of the pressure plate 26. Several pressure rods 28 are fixedly connected to the bottom surface of the pressure plate 26, and the pressure rods 28 press the gearbox housing tightly against the sealing gasket 21.

[0030] The detailed working process of this embodiment is as follows: S1, When the test piece is being tested for air tightness, the worker can place the test piece on another slide 3, that is, the material preparation work is carried out simultaneously. S2, after the test piece is tested, the hydraulic cylinder 25 drives the pressure plate 26 and the pressure rod 28 to move upward through the piston rod. The drive motor 12 drives the drive belt 18 to rotate through the drive pulley 13. The driven block 8 and the slide table 3 then slide horizontally until the test piece moves to the test position. The hydraulic cylinder 25 drives the pressure plate 26 and the pressure rod 28 to move downward through the piston rod. The pressure rod 28 presses the test piece onto the sealing gasket 21. At this time, the airtightness test can be performed.

[0031] When performing airtightness testing on the gearbox housing, the parts to be tested can be prepared simultaneously, which helps to reduce the gap between processes and improve testing efficiency.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tooling for testing the airtightness of a gearbox housing, characterized in that: The system includes a dual-position feeding mechanism (1) and a pressing mechanism (2). The dual-position feeding mechanism (1) includes several slides (3) for supporting the gearbox housing and several drive units (4) for driving the slides (3) to perform reciprocating linear motion. The pressing mechanism (2) includes several columns (22). A top plate (24) is provided on the top of the column (22). A hydraulic cylinder (25) is provided above the top plate (24). The piston rod of the hydraulic cylinder (25) passes through the top plate (24) and is connected to a pressing plate (26) that is slidably set on the column (22). Several pressing rods (28) for pressing the gearbox housing are provided on the bottom surface of the pressing plate (26).

2. The gearbox housing airtightness testing fixture according to claim 1, characterized in that: The drive unit (4) includes a fixed base (5), on which a driven block (8) connected to the bottom surface of the slide table (3) is slidably disposed, and a drive component for driving the driven block (8) to perform reciprocating linear motion is disposed on the fixed base (5).

3. The gearbox housing airtightness testing fixture according to claim 2, characterized in that: A linear slide rail (6) is provided on the top surface of the fixed base (5), and a plurality of linear sliders (7) are slidably arranged on the linear slide rail (6). The driven block (8) is arranged on the linear sliders (7).

4. The gearbox housing airtightness testing fixture according to claim 2, characterized in that: The drive assembly includes a motor frame (10) and a pulley frame (14) mounted on a fixed base (5). The motor frame (10) has a first through-shaft hole (11) along the thickness direction. A drive motor (12) is mounted on the bottom surface of the motor frame (10). The output shaft of the drive motor (12) passes through the first through-shaft hole (11) and is coaxially mounted with a drive pulley (13). The pulley frame (14) has a second through-shaft hole (15) along the thickness direction. A driven shaft (16) is rotatably mounted in the second through-shaft hole (15). A driven pulley (17) is coaxially mounted on the top of the driven shaft (16). A drive belt (18) is belt-driven between the driven pulley (17) and the drive pulley (13). The drive belt (18) is connected to the driven block (8).

5. The gearbox housing airtightness testing fixture according to claim 4, characterized in that: The bottom surface of the driven block (8) is provided with a tape groove (9), and the drive belt (18) is connected to the driven block (8) by embedding into the tape groove (9).

6. The gearbox housing airtightness testing fixture according to claim 4, characterized in that: The pulley frame (14) is provided with several bearing grooves (19), and a driven shaft (16) bearing is interference-fitted in the bearing groove (19), and the driven shaft (16) bearing is fitted on the driven shaft (16).

7. The gearbox housing airtightness testing fixture according to claim 1, characterized in that: A sealing gasket (21) is provided on the top surface of the slide (3).

8. The gearbox housing airtightness testing fixture according to claim 7, characterized in that: The sealing gasket (21) is made of rubber.

9. The gearbox housing airtightness testing fixture according to claim 1, characterized in that: The bottom of the column (22) is provided with a column base (23).

10. The gearbox housing airtightness testing fixture according to claim 1, characterized in that: A linear bearing (27) is slidably mounted on the column (22), and the linear bearing (27) is mounted on the bottom surface of the pressure plate (26).

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