Tensioner and accessory train of an engine

Abstract

The present disclosure provides a kind of tensioner and engine accessory train, belong to engine technical field.The tensioner includes base and drain plug, the side wall of the base is equipped with installation port, the drain plug is detachably inserted in the installation port, the drain plug has drain passage, the first end of the drain passage is located in the base and is communicated with the inner cavity of the base, and the second end of the drain passage is located outside the base.The present disclosure can drain the moisture invading the base of the tensioner, prevent the internal parts of the tensioner from being corroded, and improve the reliability of the tensioner.

Description

Technical Field

[0001] This disclosure relates to the field of engine technology, and in particular to a tensioner and an accessory gear system for an engine. Background Technology

[0002] An engine's accessory gear train typically includes pulleys connected to the drive shaft, pulleys connected to the motor shaft, one or more pulleys for driving other accessories, and a belt and tensioner for transmitting motion between these pulleys. The tensioner ensures the belt tension level to prevent slippage between the belt and pulleys.

[0003] In related technologies, the tensioner includes a base, a rotating shaft, a swing arm, a torsion spring, and a pulley. One end of the rotating shaft is located inside the base and connected to the base. The other end of the rotating shaft is rotatably connected to one end of the swing arm. The torsion spring is sleeved outside the rotating shaft, and both ends of the torsion spring abut against the base and the swing arm, respectively. The pulley is rotatably disposed at the other end of the swing arm.

[0004] When a car operates in a humid environment, moisture can easily seep into the engine's accessory gear system. If the moisture cannot be drained in time after entering the base, it may corrode metal parts such as the shaft and torsion spring inside the base, thus affecting the normal use of the tensioner. Summary of the Invention

[0005] This disclosure provides an accessory gear system for a tensioner and engine, capable of draining moisture that has seeped into the tensioner's base, preventing corrosion of internal tensioner components, and improving the tensioner's reliability. The technical solution is as follows:

[0006] This disclosure provides a tensioner including a base and a drain plug. The base has an installation port on its side wall, and the drain plug is detachably inserted into the installation port. The drain plug has a drainage channel, the first end of which is located inside the base and communicates with the inner cavity of the base, and the second end of which is located outside the base.

[0007] In one implementation of this disclosure, the drain plug includes a column, and the drain channel includes a first drain outlet and a second drain outlet that are interconnected. The first drain outlet is located at a first end of the column, and the second drain outlet is located on the side wall of the column. The first end of the column is inserted into the mounting port.

[0008] In another implementation of the present disclosure, the sidewall of the column has at least two second drain outlets, which are circumferentially spaced on the sidewall of the column.

[0009] In another implementation of this disclosure, the second drain outlet is a conical hole, and the cross-section of the end of the second drain outlet connected to the first drain outlet is larger than the cross-section of the end of the second drain outlet located on the side wall of the column.

[0010] In another implementation of this disclosure, the drain plug further includes a diverter block, which is inserted into the second drain outlet. The surface of the diverter block has a plurality of diverter holes that penetrate the diverter block and the diverter holes communicate with the first drain outlet.

[0011] In another implementation of this disclosure, the drain plug further includes a plurality of connecting claws arranged at intervals around the first drain outlet, one end of the connecting claws being located at the first end of the column, and the end of the connecting claws away from the column being snap-fitted to the mounting port.

[0012] In another implementation of this disclosure, the connecting claw includes a connecting plate and a stop protrusion. One side of the connecting plate is connected to the first end of the column. The stop protrusion is located on the side of the connecting plate away from the first drain outlet. The connecting plate is inserted into the mounting port. The stop protrusion is located in the base and abuts against the inner wall of the base.

[0013] In another implementation of this disclosure, the axial section of the stop protrusion is trapezoidal, the lower base of the trapezoid is close to the column, and the axial section passes through the axis of the column.

[0014] In another implementation of the present disclosure, the tensioner further includes a mounting lug located on the side wall of the base, the mounting opening located on one side of the mounting lug, and the distance from the center of the mounting opening to the mounting lug not exceeding 3 cm.

[0015] This disclosure provides an accessory gear train for an engine, the accessory gear train including a tensioner as described above.

[0016] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0017] The tensioner provided in this embodiment includes a base and a drain plug. An installation port is provided on the side wall of the base for installing the drain plug. The drain plug has a drainage channel, with one end inside the base communicating with its internal space, and the other end outside the base, connecting the base's internal cavity to the external environment. This allows moisture to drain from the base through the drainage channel when it enters the tensioner's base, preventing prolonged moisture retention and potential corrosion of internal components. Furthermore, the drain plug is detachably installed in the installation port, allowing it to be removed for maintenance and replacement when clogged or damaged, thus improving the tensioner's reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an assembly diagram of a tensioner provided in an embodiment of this disclosure;

[0020] Figure 2 This is a schematic diagram of the structure of a tensioner provided in an embodiment of this disclosure;

[0021] Figure 3 This is a schematic diagram of the structure of a drainage sleeve provided in an embodiment of this disclosure;

[0022] Figure 4 This is a cross-sectional view of a tensioner provided in an embodiment of this disclosure;

[0023] Figure 5 This is a cross-sectional view of a drain plug provided in an embodiment of this disclosure;

[0024] Figure 6 This is a cross-sectional view of another drain plug provided in an embodiment of this disclosure.

[0025] The markings in the diagram are explained as follows:

[0026] 10. Base; 11. Mounting port;

[0027] 20. Drain plug; 21. Column; 22. Connecting claw; 221. Connecting plate; 222. Stop protrusion;

[0028] 200. Drainage channel; 201. First drainage outlet; 202. Second drainage outlet;

[0029] 30. Flow divider block; 31. Flow divider orifice;

[0030] 41. Lifting lug; 42. Rotating shaft; 43. Swing arm; 431. Cylindrical structure; 44. Torsion spring; 45. Pulley; 46. Limiting washer; 47. Damping ring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” “top,” and “bottom,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0033] Figure 1 This is an assembly diagram of a tensioner provided in an embodiment of this disclosure. Figure 1 As shown, the tensioner includes a base 10 and a drain plug 20, and the base 10 has an installation port 11 on its side wall.

[0034] Figure 2 This is a schematic diagram of the structure of a tensioner provided in an embodiment of this disclosure. Figure 2 As shown, the drain plug 20 is detachably inserted into the mounting port 11.

[0035] Figure 3 This is a schematic diagram of the structure of a drainage sleeve provided in an embodiment of this disclosure. Figure 2 , 3 As shown, the drain plug 20 has a drain channel 200. The first end of the drain channel 200 is located inside the base 10 and communicates with the inner cavity of the base 10, while the second end of the drain channel 200 is located outside the base 10.

[0036] The tensioner provided in this embodiment includes a base 10 and a drain plug 20. An installation port 11 is provided on the side wall of the base 10 for installing the drain plug 20. A drain channel 200 is provided in the drain plug 20, with one end of the drain channel 200 inside the base 10 and communicating with the internal space of the base 10, and the other end outside the base 10, meaning the drain channel 200 connects the inner cavity of the base 10 to the external environment. This allows moisture to drain from the base 10 through the drain channel 200 when it enters the tensioner, preventing moisture from remaining inside the base 10 for extended periods and causing corrosion to the components inside. Furthermore, the drain plug 20 is detachably installed in the installation port 11, allowing it to be removed from the installation port 11 when it becomes clogged or damaged, facilitating maintenance and replacement and improving the reliability of the tensioner.

[0037] Figure 4 This is a cross-sectional view of a tensioner provided in an embodiment of this disclosure. (See figure) Figure 3 , 4 As shown, the drain plug 20 includes a column 21, and the drain channel 200 includes a first drain outlet 201 and a second drain outlet 202 that are interconnected. The first drain outlet 201 is located at the first end of the column 21, and the second drain outlet 202 is located on the side wall of the column 21. The first end of the column 21 is inserted into the mounting port 11.

[0038] In the above implementation, the first end of the column 21 is inserted into the mounting port 11 of the base 10, so that the first end of the column 21 faces the inner cavity of the base 10 and is located in the inner cavity of the base 10. Therefore, the first drain port 201 of the first end of the column 21 can communicate with the inner cavity of the base 10. The side wall of the column 21 is located outside the base 10, and the second drain port 202 is set on the side wall of the column 21. In this way, the water that has entered the base 10 can enter the column 21 through the first drain port 201 and be discharged from the second drain port 202 on the side wall of the column 21, so as to avoid the problem of water remaining in the base 10 for a long time and causing corrosion to the parts inside the base 10.

[0039] Furthermore, the second drain outlet 202 is located on the side wall of the column 21. Compared to setting an opening directly on the end face of the column 21, the drain outlet located on the side is less likely to allow moisture from the external environment to penetrate, thereby improving the waterproof effect of the base 10.

[0040] Optionally, such as Figure 3 As shown, the side wall of the column 21 has at least two second drain outlets 202, which are circumferentially spaced on the side wall of the column 21.

[0041] For example, such as Figure 4As shown, the side wall of the column 21 has two second drain outlets 202. The two second drain outlets 202 are distributed circumferentially around the central axis of the column 21, and the angle between the two second drain outlets 202 can be 180°.

[0042] In this way, multiple second drain outlets 202 are provided on the side wall of the column 21, and multiple second drain outlets 202 are simultaneously connected to the first drain outlet 201. In this way, water entering the first drain outlet 201 can be discharged to the external environment through different second drain outlets 202, thereby improving the drainage efficiency of the drain plug 20. Even if some second drain outlets 202 are blocked, the other second drain outlets 202 can still continue to work, thereby improving the reliability of the drain plug 20.

[0043] Figure 5 This is a cross-sectional view of a drain plug 20 provided in an embodiment of this disclosure. For example... Figure 5 As shown, the second drain outlet 202 is a conical hole, and the cross-section of the end of the second drain outlet 202 connected to the first drain outlet 201 is larger than the cross-section of the end of the second drain outlet 202 located on the side wall of the column 21.

[0044] In the above implementation, the second drain outlet 202 is set as a conical hole, and the size of the end of the second drain outlet 202 connected to the first drain outlet 201 is made larger, which is conducive to the water in the first drain outlet 201 flowing into the second drain outlet 202; at the same time, the size of the end located on the side wall of the column 21 is made smaller, so that the diameter of the end of the second drain outlet 202 that communicates with the external environment is smaller, so as to prevent water in the external environment from easily flowing back from the second drain outlet 202 into the base 10, thereby improving the waterproof performance of the base 10.

[0045] For example, such as Figure 5 As shown, the second drain outlet 202 is a conical hole. The diameter of the end of the second drain outlet 202 that connects to the first drain outlet 201 is larger than the diameter of the end of the second drain outlet 202 that is closer to the side wall of the column 21. In this way, the diameter of the area of ​​the second drain outlet 202 that is closer to the external environment is smaller, so as to reduce the diameter of the second drain outlet 202 that is in direct contact with the external environment, making it difficult for moisture in the external environment to flow back from the second drain outlet 202 into the base 10.

[0046] It should be noted that the second drain outlet 202 can also be a conical hole of other shapes, as long as the size of the end of the second drain outlet 202 that is in contact with the external environment is smaller than the size of the other end of the second drain outlet 202. This embodiment of the present disclosure does not impose any restrictions.

[0047] Figure 6 This is a cross-sectional view of another drain plug 20 provided in an embodiment of this disclosure. (See figure) Figure 6As shown, the drain plug 20 also includes a diverter block 30, which is inserted into one end of the second drain outlet 202 located in the side wall of the column 21. The surface of the diverter block 30 has a plurality of diverter holes 31 that pass through the diverter block 30, and the diverter holes 31 communicate with the first drain outlet 201.

[0048] like Figure 6 As shown, the two ends of the diversion hole 31 are located on opposite end faces of the diversion block 30, so that water entering the second drain port 202 can be discharged to the external environment through the diversion hole 31 on the diversion block 30. Compared with water being discharged directly through the second drain port 202, the diversion block 30 transforms the end of the second drain port 202 into multiple diversion holes 31 with smaller diameters. This not only satisfies the purpose of draining water to the external environment, but also, because the diversion holes 31 in the diversion block 30 are smaller, it is less likely that water in the external environment will flow back into the base 10 directly through the second drain port 202, further improving the sealing performance of the base 10.

[0049] For example, the ratio of the cross-sectional area of ​​the diversion hole 31 to the cross-sectional area of ​​the second drain outlet 202 located at one end of the side wall of the column 21 can be 1:5 to 1:10.

[0050] For example, the ratio of the cross-sectional area of ​​the diversion hole 31 to the cross-sectional area of ​​the second drain outlet 202 located at one end of the side wall of the column 21 is 1:8. This effectively reduces the total size of the opening of the second drain outlet 202 that is in direct contact with the external environment, preventing moisture in the external environment from flowing back into the base 10 directly through the second drain outlet 202.

[0051] When the diverter block 30 is inserted into the second drain outlet 202, the diverter block 30 and the second drain outlet 202 are interference-fitted. This can effectively prevent the diverter block 30 from easily falling out of the second drain outlet 202 after water impacts it.

[0052] For example, the diversion block 30 can be made of rubber. Because the rubber block has good flexibility, even if the size of the rubber block is larger than the size of the second drain outlet 202, the diversion block 30 can be inserted into the second drain outlet 202 by compression. After compression, the rubber block will also undergo elastic deformation and compress the inner wall surface of the second drain outlet 202, thereby increasing the friction between the rubber block and the second drain outlet 202 to prevent the rubber block from easily falling out of the second drain outlet 202.

[0053] Optionally, such as Figure 3As shown, the drain plug 20 also includes a plurality of connecting claws 22 arranged at intervals around the first drain port 201. One end of the connecting claw 22 is located at the first end of the column 21, and the end of the connecting claw 22 away from the column 21 is snapped into the mounting port 11. By setting the connecting claws 22 and snapping them into the mounting port 11, the drain plug 20 and the base 10 can be detachably connected.

[0054] For example, such as Figure 3 As shown, the drain plug 20 includes four connecting claws 22 arranged at intervals around the first drain port 201, with the distribution interval angle between the four connecting claws 22 being 90°.

[0055] For example, such as Figure 3 As shown, the connecting claw 22 includes a connecting plate 221 and a stop protrusion 222. One side of the connecting plate 221 is connected to the first end of the column 21. The stop protrusion 222 is located on the side of the connecting plate 221 away from the first drain outlet 201. The connecting plate 221 is inserted into the mounting port 11. The stop protrusion 222 is located in the base 10 and abuts against the inner wall of the base 10.

[0056] The connecting plate 221 is inserted into the mounting port 11. After the connecting claw 22 is installed into the mounting port 11, the stop protrusion 222 protruding from the connecting plate 221 is located in the inner cavity of the base 10. Therefore, by the stop protrusion 222 abutting against the inner wall of the base 10, the stop protrusion 222 can be prevented from falling out of the mounting port 11, thereby improving the connection reliability between the connecting claw 22 and the base 10.

[0057] For example, such as Figure 3 As shown, the connecting plate 221 can be an arc-shaped plate, and the mounting opening 11 is a round hole. When the arc-shaped plate is inserted into the mounting opening 11, the arc surface of the connecting plate 221 can form a good surface fit with the inner wall of the mounting opening 11, ensuring a tight fit between the connecting claw 22 and the mounting opening 11. This prevents the connecting plate 221 from wobbling within the mounting opening 11 and improves the connection reliability between the connecting claw 22 and the mounting opening 11.

[0058] Optional, such as Figure 3 As shown, the axial section of the stop protrusion 222 is trapezoidal, with the lower base of the trapezoid close to the column 21, and the axial section passing through the axis of the column 21.

[0059] The first section is perpendicular to the connecting plate 221 and the first end of the column 21.

[0060] In the above implementation, by setting the first cross-section of the stop protrusion 222 to be trapezoidal, the surface of the stop protrusion 222 away from the connecting plate 221 is inclined. In this way, during the process of inserting the connecting claw 22 into the mounting port 11, the stop protrusion 222 slides into contact with the inner wall of the mounting port 11 through the inclined surface, making it easier for the stop protrusion 222 to slide into the inner cavity of the base 10 through the inclined surface, thereby facilitating the installation of the connecting claw 22.

[0061] Optionally, such as Figure 1 , 2 As shown in Figure 4, the tensioner also includes a mounting lug 41, which is located on the side wall of the base 10. The mounting opening 11 is located on one side of the mounting lug 41, and the distance L from the center of the mounting opening 11 to the mounting lug 41 does not exceed 3cm.

[0062] By positioning the mounting port 11 on one side of the mounting lug 41 and controlling the distance between the mounting port 11 and the mounting lug 41 to be relatively close, the mounting port 11 can be blocked by the mounting lug 41, making it less likely for water discharged from the drain plug 20 to splash, reducing the possibility of water re-entering the pulleys and belts of the accessory wheel system after being discharged, and improving the waterproof effect of the base 10.

[0063] For example, such as Figure 4 As shown, the distance L from the center of the mounting port 11 to the mounting lug 41 is 2cm.

[0064] Optionally, such as Figure 2 , 4 As shown, the mounting port 11 for installing the drain plug 20 is located at the lowest end of the base 10 in its working position.

[0065] When a vehicle travels through deep puddles or pools, water seeps into the tensioner's base 10. Under gravity, the water typically accumulates at the lowest point of the base 10 in its working position. Therefore, placing the mounting port 11 at the lowest point of the base 10 in its working position allows the water accumulated at the bottom of the base 10 to drain away, preventing prolonged water accumulation and oxidation / corrosion of the internal components. This keeps the tensioner in a dry environment, effectively improving its robustness against harsh environments and extending its lifespan.

[0066] Optionally, the drainage sleeve can be made of ethylene propylene diene monomer (EPDM) rubber. EPDM rubber has a fully saturated linear chain structure without double bonds, and its side chains contain dienes, allowing for sulfur vulcanization. EPDM rubber possesses excellent aging resistance, ozone resistance, weather resistance, and heat resistance, enabling long-term use at 120°C. It is resistant to chemicals (such as alcohols, acids, strong alkalis, and oxidants) but not to aliphatic and aromatic solvents. EPDM rubber has the lowest density among rubbers, exhibits high filler capacity, and ensures component reliability, making it ideal for applications in the engine compartment and surrounding environment of vehicles.

[0067] Optionally, such as Figure 4 As shown, the tensioner also includes a rotating shaft 42, a swing arm 43, a torsion spring 44, and a pulley 45. One end of the rotating shaft 42 is located inside the base 10 and connected to the base 10. The other end of the rotating shaft 42 is rotatably connected to one end of the swing arm 43. The torsion spring 44 is sleeved on the outside of the rotating shaft 42. One end of the torsion spring 44 abuts against the inner wall of the base 10, and the other end of the torsion spring 44 abuts against the swing arm 43. The pulley 45 is rotatably disposed at the other end of the swing arm 43.

[0068] During use, the tensioner uses pulley 45 to wind the belt. After the belt is wound on pulley 45, pulley 45 drives swing arm 43 to rotate, so that torsion spring 44 is in an elastic deformation state. In this way, under the elastic force of torsion, pulley 45 can apply tension to the belt to tighten the belt and ensure the belt tension level to prevent slippage between the belt and pulley.

[0069] Optionally, such as Figure 4 As shown, the swing arm 43 has a cylindrical structure 431 inside the insert base 10. The cylindrical structure 431 is movably fitted outside the rotating shaft 42, and the torsion spring 44 is fitted outside the cylindrical structure 431, with the other end of the torsion spring 44 abutting against the cylindrical structure 431. In this way, the swing arm 43 is installed inside the base 10 through the cylindrical structure 431, so that the swing arm 43 is connected to the base 10 in addition to being connected to the rotating shaft 42, and is also connected to the base 10 through the cylindrical structure 431, making the swing arm 43 more stably installed on the base 10 and improving the connection reliability of the swing arm 43.

[0070] Optionally, such as Figure 4 As shown, a limiting gasket 46 and a damping ring 47 coaxially fitted outside the limiting gasket 46 are also provided between the inner wall of the cylindrical structure 431 and the base 10.

[0071] The limiting shim 46 can fill the gap between the cylindrical structure 431 and the base 10 to prevent the swing arm 43 from wobbling relative to the base 10 due to the large gap between the cylindrical structure 431 and the base 10 after the swing arm 43 is installed on the base 10, thereby improving the connection reliability of the swing arm 43.

[0072] Setting a damping ring 47 can increase the friction between the limiting pad 46 and the inner wall of the base 10, making it less likely for the limiting pad 46 to slide relative to the base 10, preventing the limiting pad 46 from rotating inside the base 10 during the rotation of the swing arm 43, and improving the connection reliability of the various components inside the base 10.

[0073] This disclosure provides an accessory gear train for an engine, the accessory gear train including a tensioner as described above.

[0074] The accessory gear system may also include a belt, crankshaft pulley 45, air conditioning compressor bracket, air conditioning compressor, idler wheel, mechanical water pump, and generator. The air conditioning compressor bracket is provided with multiple mounting points to install the air conditioning compressor and the idler wheel. The air conditioning compressor bracket is also fixed to the cylinder block and oil pan through multiple mounting points.

[0075] During operation, the belt transmits the torque output from the crankshaft pulley 45 to various accessories. The tensioner provides stable belt tension, and the combination of the tensioner and the belt enables the engine accessories to operate stably and normally.

[0076] In the above implementation methods, see Figure 1 The tensioner includes a base 10 and a drain plug 20, and the base 10 has an installation port 11 on its side wall. For example... Figure 2 As shown, the drain plug 20 is detachably inserted into the mounting port 11. Figure 2 , 3 As shown, the drain plug 20 has a drain channel 200. The first end of the drain channel 200 is located inside the base 10 and communicates with the inner cavity of the base 10, while the second end of the drain channel 200 is located outside the base 10.

[0077] Since the tensioner includes a base 10 and a drain plug 20, an installation port 11 is provided on the side wall of the base 10 for installing the drain plug 20. The drain plug 20 has a drainage channel 200, with one end inside the base 10 connecting to the internal space, and the other end outside the base 10, connecting the inner cavity of the base 10 to the external environment. This allows moisture to drain from the base 10 through the drainage channel 200 when it enters, preventing moisture from remaining inside the base 10 for extended periods and causing corrosion to the internal components. Furthermore, the drain plug 20 is detachably installed in the installation port 11, allowing it to be removed when clogged or damaged for easy maintenance and replacement, thus improving the reliability of the tensioner.

[0078] The above is not intended to limit this disclosure in any way. Although this disclosure has been disclosed above through embodiments, it is not intended to limit this disclosure. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this disclosure. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this disclosure without departing from the content of the technical solution of this disclosure shall still fall within the scope of the technical solution of this disclosure.

Claims

1. A tensioner, characterized in that, The tensioner includes a base (10) and a drain plug (20). The base (10) has an installation port (11) on its side wall. The drain plug (20) is detachably inserted into the installation port (11). The drain plug (20) has a drain channel (200). The first end of the drain channel (200) is located inside the base (10) and communicates with the inner cavity of the base (10). The second end of the drain channel (200) is located outside the base (10). The drain plug (20) includes a column (21) and a diverter block (30). The drain channel (200) includes a first drain outlet (201) and a second drain outlet (202) that are interconnected. The first drain outlet (201) is located at the first end of the column (21), and the second drain outlet (202) is located on the side wall of the column (21). The first end of the column (21) is inserted into the mounting port (11). The cross-section of the end of the second drain outlet (202) connected to the first drain outlet (201) is larger than that of the first drain outlet (201). The second drain outlet (202) is located at one end of the side wall of the column (21) in cross-section; the diversion block (30) is inserted into the second drain outlet (202), and the surface of the diversion block (30) has a plurality of diversion holes (31) penetrating the diversion block (30), the diversion holes (31) communicating with the first drain outlet (201), wherein the ratio of the cross-sectional area of ​​the diversion hole (31) to the cross-sectional area of ​​the second drain outlet (202) located at one end of the side wall of the column (21) is 1:5 to 1:10; The mounting port (11) is located at the lowest end of the base (10) in its working posture.

2. The tensioner according to claim 1, characterized in that, The sidewall of the column (21) has at least two second drain outlets (202), which are circumferentially spaced on the sidewall of the column (21).

3. The tensioner according to claim 1, characterized in that, The second drain outlet (202) is a conical hole. The cross-section of the end of the second drain outlet (202) connected to the first drain outlet (201) is larger than the cross-section of the end of the second drain outlet (202) located on the side wall of the column (21).

4. The tensioner according to claim 1, characterized in that, The drain plug (20) also includes a plurality of connecting claws (22) arranged at intervals around the first drain port (201). One end of the connecting claw (22) is located at the first end of the column (21), and the end of the connecting claw (22) away from the column (21) is snapped into the mounting port (11).

5. The tensioner according to claim 4, characterized in that, The connecting claw (22) includes a connecting plate (221) and a stop protrusion (222). One side of the connecting plate (221) is connected to the first end of the column (21). The stop protrusion (222) is located on the side of the connecting plate (221) away from the first drain outlet (201). The connecting plate (221) is inserted into the mounting port (11). The stop protrusion (222) is located in the base (10) and abuts against the inner wall of the base (10).

6. The tensioner according to claim 5, characterized in that, The axial section of the stop protrusion (222) is trapezoidal, with the lower base of the trapezoid close to the column (21), and the axial section passing through the axis of the column (21).

7. The tensioner according to any one of claims 1 to 6, characterized in that, The tensioner also includes a mounting lug (41), which is located on the side wall of the base (10). The mounting port (11) is located on one side of the mounting lug (41), and the distance from the center of the mounting port (11) to the mounting lug (41) does not exceed 3cm.

8. An accessory gear train for an engine, characterized in that, The accessory gear train includes a tensioner as described in any one of claims 1 to 7.

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