A dry pulley drive air tightness detection equipment

Abstract

The utility model discloses a kind of dry type belt pulley driver air tightness detection equipment, belong to camshaft dry type belt pulley driver technical field, including rack, dry type belt pulley, the rack top horizontal fixed setting has liquid storage tank, the rack one side is fixedly set with detection box, the detection box rear surface is fixedly set with the extraction component for conveying rustproof liquid to the detection box interior, the rack below is fixedly set with gas storage tank, the detection box is internally provided with the sealing tooling component for fixing and sealing the dry type belt pulley;The sealing tooling component includes the hydraulic cylinder vertically fixed setting in the detection box bottom, base fixedly set in detection box interior, fixed vertical setting in the base middle part and one end to the dry type belt pulley middle part conveying gas's spiral pipe, the utility model effectively detects the air tightness of dry type belt pulley, strictly controls the quality of product, reduces the engine repair rate possibly exists.

Description

Technical Field

[0001] This utility model relates to the field of camshaft dry pulley drive technology, specifically a dry pulley drive airtightness testing device. Background Technology

[0002] With the continuous advancement of automotive engine technology, Variable Valve Timing (VVT) technology has been widely applied. VVT technology can adjust the valve opening time and lift in real time according to different engine operating conditions, thereby improving engine power, fuel economy, and emissions performance. In the VVT ​​system, the pulley, as a crucial component connecting the camshaft and crankshaft, directly affects the system's performance. To ensure the normal operation of the VVT ​​system, a pulley capable of operating in a dry, oil-free environment is needed to avoid the influence of engine oil on the belt. The need for reduced cost and noise: Compared to chain drives, pulley drives offer advantages such as lower noise and cost, better meeting the automotive industry's pursuit of comfort and economy. However, traditional pulleys have some airtightness issues. For example, the powder metallurgy parts of traditional pulleys typically have a certain degree of porosity. While processes such as steam treatment or impregnation sealing are generally used to reduce the porosity of powder metallurgy parts, the presence of pores provides a channel for oil penetration. During engine operation, engine oil may seep into the pulley teeth. This can not only cause belt slippage, affecting the normal operation of the engine, but may also trigger a series of malfunctions, such as incorrect engine valve timing.

[0003] Traditional airtightness testing methods use airtightness instruments to perform tests using pressure drop and flow rate methods. These methods have high requirements for environment, tooling, temperature, and air source, are subject to many influencing factors, and are not intuitive for detecting leaks. Therefore, it is necessary to propose a testing device that uses water-based airtightness testing to detect the airtightness of dry pulleys. Utility Model Content

[0004] The purpose of this invention is to provide a device for testing the air tightness of a dry pulley drive, so as to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a frame and a dry pulley. A liquid storage tank is horizontally fixed above the frame, and a testing box is fixedly installed on one side of the frame. An extraction component for conveying rust-preventive liquid into the testing box is fixedly installed on the rear surface of the testing box. A gas storage tank is fixedly installed below the frame, and a gas delivery pipe for conveying gas is installed at the upper end of the gas storage tank. A sealing fixture assembly for fixing and sealing the dry pulley is installed inside the testing box.

[0006] The sealing fixture assembly includes a hydraulic cylinder vertically fixed at the bottom of the test chamber, a base fixed inside the test chamber, a spiral tube vertically fixed at the middle of the base and supplying gas to the middle of the dry pulley at one end, a sleeve rod fixedly connected to the output end of the hydraulic cylinder and slidably sleeved on the outer wall of the spiral tube through the base at one end, a connecting rod fixedly installed on both sides of the upper end of the sleeve rod and extending to both sides through the base at one end, and a sealing cylinder sleeved on the bottom end of the outer wall of the base and fixedly connected to the end of the connecting rod.

[0007] The upper end of the sealing cylinder is plugged inside the bottom end of the dry pulley, and the upper end of the spiral tube is threaded with a screw plug, the outer wall of which is threaded to the inner side of the dry pulley.

[0008] Preferably, the extraction assembly includes a water pump fixedly mounted on the rear surface of the detection box, an extraction pipe connected to the input end of the water pump and extending one end into the liquid storage tank, and an outlet pipe connected to the water output end and extending one end into the detection box.

[0009] Preferably, the liquid storage tank is provided with a magnetic plate that divides the cavity horizontally into two, and the top of the magnetic plate has multiple leakage holes.

[0010] Preferably, the liquid storage tank is provided with a first discharge pipe at the bottom, and the detection tank is provided with a second discharge pipe at the bottom.

[0011] Preferably, the inner wall of the sealing cylinder is in close contact with the outer wall of the base, and the outer wall of the sealing cylinder is in close contact with the contact area of ​​the dry pulley.

[0012] Preferably, the lower part of the spiral tube is a smooth tubular shape, the inner side of the upper end of the dry pulley is provided with a threaded groove, and the outer wall of the screw plug is provided with threads for threaded connection in the threaded groove.

[0013] Preferably, the other end of the air delivery pipe passes through the base and the sleeve and communicates with the lower part of the spiral tube.

[0014] Preferably, the sleeve rod has a notch at the position opposite to the air delivery pipe. The notch is vertically arranged so that the air delivery pipe can pass through when the sleeve rod moves up and down. The base has notches on both sides, and one end of the two connecting rods moves up and down through the notches respectively.

[0015] Preferably, the outer wall of the solenoid tube is provided with an exhaust port for supplying gas to the detection part inside the dry pulley cavity.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In use, this utility model uses a sealing fixture assembly to fix the dry pulley inside the test chamber. A water pump delivers liquid into the test chamber, with the liquid level exceeding that of the dry pulley. Then, a gas tank delivers compressed gas to the sealing gas inlet of the dry pulley. Once the gas supply reaches the specified pressure, the gas supply is shut off. Observe whether any bubbles are generated around the dry pulley. If bubbles are present, the product's sealing performance is unqualified. This method can effectively test the airtightness of the dry pulley, strictly control product quality, and reduce the potential engine rework rate.

[0018] 2. When using this utility model, the tested liquid is discharged and recycled from the testing box, and can be poured back into the liquid storage tank. The liquid storage tank is divided into two by a magnetic plate. The poured rust-preventive liquid comes into contact with the magnetic plate and magnetically removes the metal debris contained in the liquid. The cleaned liquid slowly flows from the leakage hole in the magnetic plate into the lower part of the liquid storage tank, which can be used to clean and recycle the tested liquid. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0021] Figure 2 This is a schematic diagram of the overall box cover opening structure in this embodiment;

[0022] Figure 3 This is a front view schematic diagram of the sealing tooling assembly in this embodiment;

[0023] Figure 4 This is a top view of the internal structure of the liquid storage tank in this embodiment;

[0024] Figure 5 This is a three-dimensional structural diagram of the sealing tooling assembly in this embodiment;

[0025] Figure 6 This is a front sectional view of the sealing tooling assembly in this embodiment;

[0026] Figure 7 This is an example. Figure 6 A magnified schematic diagram of structure A in the diagram.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Frame; 2. Liquid storage tank; 21. Magnetic plate; 22. First discharge pipe; 3. Detection box; 31. Second discharge pipe; 4. Extraction assembly; 41. Water pump; 42. Extraction pipe; 43. Outlet pipe; 5. Gas storage tank; 51. Gas delivery pipe; 6. Sealing fixture assembly; 61. Hydraulic cylinder; 62. Base; 63. Sealing cylinder; 64. Threaded tube; 65. Sleeve rod; 66. Connecting rod; 641. Exhaust port; 7. Dry pulley; 8. Plug. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-7 This utility model provides a technical solution: a dry pulley drive air tightness testing device, including a frame 1 and a dry pulley 7. A liquid storage tank 2 is horizontally fixed above the frame 1, and a testing box 3 is fixedly fixed on one side of the frame 1. An extraction component 4 for conveying anti-rust liquid into the testing box 3 is fixedly fixed on the rear surface of the testing box 3. A gas storage tank 5 is fixedly fixed below the frame 1, and a gas delivery pipe 51 for conveying gas is provided at the upper end of the gas storage tank 5. A sealing tooling component 6 for fixing and sealing the dry pulley 7 is provided inside the testing box 3.

[0031] The sealing fixture assembly 6 includes a hydraulic cylinder 61 vertically fixed at the bottom of the test box 3, a base 62 fixedly installed inside the test box 3, a spiral tube 64 fixedly installed vertically in the middle of the base 62 and supplying gas to the middle of the dry pulley 7 at one end, a sleeve rod 65 fixedly connected to the output end of the hydraulic cylinder 61 and slidably sleeved on the outer wall of the spiral tube 64 through the base 62 at one end, a connecting rod 66 fixedly installed on both sides of the upper end of the sleeve rod 65 and extending to both sides through the base 62 at one end, and a sealing cylinder 63 sleeved on the outer wall of the base 62 and fixedly connected at the bottom end to one end of the connecting rod 66.

[0032] The upper end of the sealing cylinder 63 is plugged inside the bottom end of the dry pulley 7, and the upper end of the screw tube 64 is threaded with a screw plug 8, the outer wall of the screw plug 8 being threaded to the inner side of the dry pulley 7.

[0033] By adding rust inhibitor liquid inside the liquid storage tank 2, during testing, the dry pulley 7 is passed through the screw tube 64, leaving one end of the screw tube 64 exposed. A screw plug 8 is threaded onto the upper end of the screw tube 64, and its outer wall is threaded into the inner side of the dry pulley 7 to seal and fix the upper hole of the dry pulley 7. Then, the hydraulic cylinder 61 pushes the connected sleeve rod 65 upward. The two connecting rods 66 on the upper end of the sleeve rod 65 drive the sealing cylinder 63 connected at one end to move upward and seal it at the lower end of the dry pulley 7. After sealing, the liquid is pumped into the test chamber 3 by the water pump 41, and the liquid level is higher than that of the dry pulley 7. Then, the compressed gas is pumped into the solenoid 64 through the gas tank 5. The solenoid 64 pumps the gas into the sealing test gas inlet of the dry pulley 7 through the gas discharge hole 641 opened at the top. When the gas supply reaches the specified pressure, the gas supply is turned off. Observe whether there are bubbles around the dry pulley 7. If bubbles appear, the product seal is unqualified. This can effectively test the airtightness of the dry pulley 7, strictly control the quality of the product, and reduce the engine repair rate.

[0034] More preferably, the extraction component 4 includes a water pump 41 fixedly disposed on the rear surface of the detection box 3, an extraction pipe 42 connected to the input end of the water pump 41 and extending one end into the liquid storage tank 2, and an outlet pipe 43 connected to the water output end and extending one end into the detection box 3.

[0035] Rust-preventive liquid is drawn into the liquid storage tank 2 through the extraction pipe 42 provided by the water pump 41, and the liquid is delivered into the detection tank 3 through the outlet pipe 43 provided by the water pump 41. The extraction pipe 42 is located below the magnet plate 21.

[0036] More preferably, the liquid storage tank 2 is provided with a magnetic plate 21 that divides the cavity horizontally into two, and the top of the magnetic plate 21 has a plurality of leakage holes.

[0037] The magnetic plate 21, which is horizontally arranged at the temporal part of the liquid storage tank 2, allows the tested liquid to be poured into the liquid storage tank 2. This process adsorbs and cleans metal debris in the liquid, preventing metal particles in the liquid from affecting the airtightness test of the dry pulley 7.

[0038] More preferably, the liquid storage tank 2 is provided with a first discharge pipe 22 at the bottom, and the detection tank 3 is provided with a second discharge pipe 31 at the bottom;

[0039] The liquid is discharged through the first discharge pipe 22 at the bottom of the liquid storage tank 2, and the liquid in the detection tank 3 is discharged through the second discharge pipe 31 at the bottom of the detection tank 3.

[0040] More preferably, the inner wall of the sealing cylinder 63 is in close contact with the outer wall of the base 62, and the outer wall of the sealing cylinder 63 is in close contact with the contact portion of the dry pulley 7;

[0041] The sealing cylinder 63 is tightly fitted and slides against the outer wall of the base 62. The outer wall of the sealing cylinder 63 is tightly fitted against the contact part of the dry pulley 7. The sealing cylinder 63 is set between the dry pulley 7 and the base 62 to seal the bottom of the dry pulley 7, which facilitates the airtightness test.

[0042] More preferably, the lower part of the solenoid 64 is a smooth tubular shape, the inner side of the upper end of the dry pulley 7 is provided with a threaded groove, and the outer wall of the screw plug 8 is provided with a thread for threaded connection in the threaded groove.

[0043] The lower part of the screw tube 64 is a smooth tubular shape, which facilitates the sliding of the sleeve rod 65 on the lower outer wall of the screw tube 64. The thread on the outer wall of the screw plug 8 is used for threaded connection in the inner screw groove of the dry pulley 7, and the screw plug 8 is fixed on the inner ring of the dry pulley 7.

[0044] More preferably, the other end of the air delivery pipe 51 passes through the base 62 and the sleeve 65 and communicates with the lower part of the screw pipe 64;

[0045] Gas is delivered into the spiral tube 64 by passing one end of the gas delivery pipe 61 through the base 62 and the sleeve 65 and connecting with the spiral tube 64.

[0046] More preferably, the sleeve rod 65 has a notch at the position opposite to the air delivery pipe 51. The notch is vertically arranged so that the air delivery pipe 51 can pass through when the sleeve rod 65 moves up and down. The base 62 has notches on both sides, and one end of the two connecting rods 66 can move up and down through the notches respectively.

[0047] With the notch opened at the opposite part of the sleeve rod 65 and the air delivery pipe 51, the air delivery pipe 51 is located in the notch when the sleeve rod 65 moves, which does not affect the movement of the sleeve rod 65. With the notches opened on the upper and lower sides of the base 62, the connecting rod 66 set above the sleeve rod 65 is connected to the sealing cylinder 63 through the base 62, and space is left for the connecting rod 66 to move up and down.

[0048] More preferably, the outer wall of the solenoid 64 is provided with an exhaust hole 641 for supplying gas to the detection part inside the dry pulley 7;

[0049] The discharge hole 641, which is opened through the outer wall of the solenoid 64, is located in the inner cavity of the dry pulley 7 and supplies gas to the detection part of the dry pulley 7 for testing the airtightness of the dry pulley 7 in liquid.

[0050] A specific application of this embodiment is as follows: First, the dry pulley 7 is fixedly sealed on the sealing fixture assembly 6. Then, liquid is pumped into the test chamber 3 by the water pump 41, and the liquid level is higher than that of the dry pulley 7. Then, compressed gas is pumped into the solenoid 64 by the gas storage tank 5. The solenoid 64 pumps the gas into the sealing test gas inlet of the dry pulley 7 through the gas discharge hole 641 opened at the top. When the gas supply reaches the specified pressure, the gas supply is turned off. Observe whether there are any bubbles generated around the dry pulley 7. After the test, the liquid is discharged through the second discharge pipe 31 set at the bottom of the test chamber 3. By loosening the screw plug 8, which has a hexagonal top and can be disassembled with matching tools, the dry pulley 7 can be removed from the sealing cylinder 63 to complete the airtightness test.

[0051] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the airtightness of a dry pulley drive, comprising a frame (1) and a dry pulley (7), characterized in that: A liquid storage tank (2) is fixedly installed horizontally above the frame (1). A test box (3) is fixedly installed on one side of the frame (1). An extraction component (4) for conveying rust-preventive liquid into the test box (3) is fixedly installed on the rear surface of the test box (3). A gas storage tank (5) is fixedly installed below the frame (1). A gas delivery pipe (51) for conveying gas is installed at the upper end of the gas storage tank (5). A sealing fixture component (6) for fixing and sealing the dry pulley (7) is installed inside the test box (3). The sealing fixture assembly (6) includes a hydraulic cylinder (61) vertically fixed at the bottom of the test box (3), a base (62) fixed inside the test box (3), a spiral tube (64) fixedly installed vertically in the middle of the base (62) and supplying gas to the middle of the dry pulley (7) at one end, a sleeve rod (65) fixedly connected to the output end of the hydraulic cylinder (61) and slidably sleeved on the outer wall of the spiral tube (64) through the base (62) at one end, a connecting rod (66) fixedly installed on both sides of the upper end of the sleeve rod (65) and extending to both sides through the base (62) at one end, and a sealing cylinder (63) sleeved on the bottom end of the outer wall of the base (62) and fixedly connected to the end of the connecting rod (66). The upper end of the sealing cylinder (63) is plugged inside the bottom end of the dry pulley (7), and the upper end of the screw tube (64) is threaded with a screw plug (8), the outer wall of the screw plug (8) is threaded to the inner side of the dry pulley (7).

2. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The extraction assembly (4) includes a water pump (41) fixedly installed on the rear surface of the detection box (3), an extraction tube (42) connected to the input end of the water pump (41) and extending one end into the liquid storage tank (2), and an outlet tube (43) connected to the water output end and extending one end into the detection box (3).

3. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The liquid storage tank (2) is provided with a magnetic plate (21) that divides the cavity horizontally into two, and the top of the magnetic plate (21) has multiple leakage holes.

4. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The liquid storage tank (2) is provided with a first discharge pipe (22) at the bottom, and the detection tank (3) is provided with a second discharge pipe (31) at the bottom.

5. The airtightness testing device for a dry belt pulley drive according to claim 4, characterized in that: The inner wall of the sealing cylinder (63) is in close contact with the outer wall of the base (62), and the outer wall of the sealing cylinder (63) is in close contact with the dry pulley (7).

6. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The lower part of the spiral tube (64) is a smooth tubular shape, the upper inner side of the dry pulley (7) is provided with a threaded groove, and the outer wall of the screw plug (8) is provided with a thread for threaded connection in the threaded groove.

7. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The other end of the air delivery pipe (51) passes through the base (62) and the sleeve (65) and communicates with the lower part of the screw pipe (64).

8. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The sleeve (65) has a notch at the position opposite to the air delivery pipe (51). The notch is vertically set so that the sleeve (65) can pass through the air delivery pipe (51) when it moves up and down. The base (62) has notches on both sides, and one end of the two connecting rods (66) moves up and down through the notches respectively.

9. The airtightness testing device for a dry belt pulley drive according to claim 1, characterized in that: The outer wall of the solenoid (64) is provided with an exhaust hole (641) for supplying gas to the detection part inside the dry pulley (7).

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