CN118815968A

CN118815968A - Check valve, tensioner, engine, powertrain and vehicle

Info

Publication number: CN118815968A
Application number: CN202311799153.2A
Authority: CN
Inventors: 潘世翼; 王松; 黄华明; 蓝柏年; 林米多
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-12-25
Filing date: 2023-12-25
Publication date: 2024-10-22

Abstract

The present invention relates to the field of automobiles, and specifically discloses a one-way valve, including a one-way valve body, on which a load-relief channel is provided. The one-way valve can quickly reduce the oil pressure in the tensioner cavity, thereby preventing the chain from being damaged due to long-term excessive pressure, thereby extending the service life of the chain. The present invention also discloses a tensioning device, an engine, a power assembly and a vehicle.

Description

One-way valve, tensioning device, engine, power assembly and vehicle

Technical Field

The invention relates to the field of automobiles, in particular to a one-way valve, a tensioning device, an engine, a power assembly and a vehicle.

Background

The tensioner plays a role in guiding and tensioning a timing belt or a timing chain of the engine, so that the timing belt or the timing chain is always in an optimal tensioning state, and the problems of belt slipping, chain loosening, tooth jumping of a synchronous belt and the like are avoided.

The tensioner mainly comprises a tensioner cavity, a plunger and a one-way valve, wherein the one-way valve is a key component for directly controlling the flow and the flow direction of high-pressure engine oil in the tensioner, has an important function, and in the prior art, when the plunger is under the pressure of a tensioning plate, the engine oil pressure in the tensioner cavity can be continuously increased, but under the action of the one-way valve, the engine oil in the tensioning ware cavity can only flow to the oil storage chamber through the clearance between piston and the casing, but the clearance between piston and the casing is less, and the oil pressure difference that forms in the tensioning ware cavity is great, leads to the chain of tensioning board effect to receive too big and take place to damage for a long time, influences the life of chain.

In view of the foregoing, there is a need to provide a one-way valve that solves or overcomes the above-mentioned technical problems.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a one-way valve which is provided with an unloading channel and can quickly reduce the oil pressure in a cavity of a tensioner, so that damage to a chain caused by overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

The second technical problem to be solved by the invention is to provide a tensioning device which adopts the one-way valve, so that the oil pressure in a cavity of the tensioner can be quickly reduced, and the damage to a chain caused by overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

The third technical problem to be solved by the invention is to provide an engine, which adopts the tensioning device and can quickly reduce the oil pressure in a cavity of a tensioner, so that the damage to a chain caused by overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

The fourth technical problem to be solved by the invention is to provide a power assembly which adopts the engine and can quickly reduce the oil pressure in a cavity of a tensioner, thereby avoiding damage to a chain caused by long-term overlarge compression and prolonging the service life of the chain.

The fifth technical problem to be solved by the invention is to provide a vehicle, which adopts the power assembly, and can quickly reduce the oil pressure in the cavity of the tensioner, so as to avoid damage to the chain caused by long-term overlarge compression, and further prolong the service life of the chain.

In order to solve the technical problem, a first aspect of the present invention provides a one-way valve, which comprises a one-way valve main body, wherein an unloading channel is arranged on the one-way valve main body.

Optionally, the unloading channel comprises a first oil groove, and the first oil groove is arranged in a spiral mode.

Optionally, the unloading channel further comprises a second oil groove and a third oil groove, the first oil groove is suitable for being communicated with the cavity on one side of the check valve body through the second oil groove, and the first oil groove is suitable for being communicated with the cavity on the other side of the check valve body through the third oil groove.

A second aspect of the present invention provides a tensioning device comprising: the one-way valve of the technical scheme.

Optionally, further comprising a housing and a plunger; the shell is provided with a sliding channel, the plunger is connected in the sliding channel in a sliding way and can extend out of the sliding channel, and the shell and the sliding channel are enclosed to form a preset cavity; the check valve body is arranged in the preset cavity and divides the preset cavity into a first cavity and a second cavity; the one-way valve is configured to: allowing the medium in the first chamber to flow into the second chamber; the relief passage communicates with the first chamber and the second chamber, respectively, the relief passage being configured to: when the pressure difference between the first chamber and the second chamber reaches a threshold value, a portion of the medium in the second chamber can flow into the first chamber along the relief passage.

Optionally, the plunger has a first end and a second end, the first end can extend out of the sliding channel, a groove is formed in the second end, and the groove and the sliding channel enclose the predetermined chamber.

Optionally, an elastomer is also included; the inner wall of the groove forms a step surface, and the elastic body is connected between the inner wall of the sliding channel and the check valve main body and is suitable for abutting the check valve main body on the step surface.

Optionally, a gap channel is formed between the outer wall of the plunger and the inner wall of the sliding channel, a first oil hole is formed in the shell, the first oil hole is communicated with the gap channel, a second oil hole is formed in the inner wall of the groove, and the second oil hole is communicated with the gap channel.

Optionally, the clearance channel includes a first portion and a second portion, the first portion has a cross-sectional area smaller than the second portion, the first oil hole and the second oil hole are respectively communicated into the second portion, and the first portion extends along an axial direction of the plunger and is communicated into the second oil cavity.

Preferably, the clearance channel is defined by a strip-shaped groove formed in the outer wall of the plunger and the inner wall of the sliding channel, and the strip-shaped groove extends along the extending direction of the plunger.

Preferably, the plunger is slidable between a first limit position and a second limit position; when the plunger is at a first limit position, the volume of the second chamber is a first value, and the distance between the first oil hole and the second oil hole in the extending direction of the plunger is a first distance; when the plunger is at a second limit position, the volume of the second chamber is a second value, and the distance between the first oil hole and the second oil hole in the extending direction of the plunger is a second distance; the first value is less than the second value and the first distance is less than the second distance.

Preferably, the cross-sectional area of the clearance oil passage is smaller than the cross-sectional areas of the first oil hole and the second oil hole.

Preferably, a ratchet spring and a ratchet connected to the ratchet spring are mounted to the housing, and teeth on the ratchet engage with teeth on the plunger.

Preferably, the ratchet is provided with a pin hole for inserting a positioning shaft, the positioning shaft is also provided with a positioning pin sheet so as to ensure the installation position relation between the ratchet and the shell,

A third aspect of the present invention provides an engine comprising the tensioner of the above-described aspect and the tensioner being disposed obliquely with respect to a horizontal plane.

A fourth aspect of the present invention provides a powertrain comprising the engine of the above-described aspect.

A fifth aspect of the invention provides a vehicle comprising an engine or a powertrain as described in the above-mentioned aspects.

Through the technical scheme, the invention has the following beneficial effects:

The check valve comprises a check valve main body, wherein the check valve main body is provided with an unloading channel, so that the oil pressure in a cavity of a tensioner can be quickly reduced, damage to a chain caused by overlarge pressure for a long time is avoided, and the service life of the chain is prolonged.

Drawings

FIG. 1 is a schematic illustration of a one-way valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a front view of a tensioner according to an embodiment of the present invention;

FIG. 3 is a schematic top view of a tensioner according to an embodiment of the present invention;

Fig. 4 is a schematic left-hand view of a tensioning device according to an embodiment of the present invention.

Sign description of the attached body

1. A first chamber; 2. a housing; 3. a plunger; 31. a groove; 311. a step surface; 4. a second chamber; 5. a check valve body; 51. a first oil groove; 52. a second oil groove; 53. a third oil groove; 54. a valve core; 55. a check valve spring; 6. a first oil hole; 7. a clearance oil passage; 8. a ratchet spring; 9. a ratchet; 10. positioning a shaft; 11. a pin hole; 12. positioning pin sheets; 13. an elastic member; 14. a plug pin; 15. and a second oil hole.

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

It should be noted first that, in the following description, some directional terms are used to clearly illustrate the technical solution of the present invention, only for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and thus, features defining "first," "second," or the like, may explicitly or implicitly include one or more of such features.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention provides a one-way valve, which is shown by referring to fig. 1 to 4, and comprises a one-way valve body 5, wherein an unloading channel is arranged on the one-way valve body 5.

When the check valve of the present invention is applied to a timing chain tensioner of an engine, the check valve is configured to allow only oil to flow from a first chamber 1 to a second chamber 4 in the tensioner, an inlet of an unloading passage communicates with the second chamber 4, and an outlet of the unloading passage communicates with the first chamber 1. In general, the first chamber 1 may be defined as a low pressure chamber and the second chamber 4 as a high pressure chamber. When the pressure of the second chamber 4 is too high, the unloading channel is opened, oil flows back to the first chamber 1 from the second chamber 4, so that the pressure of the second chamber 4 is reduced, and the chain damage caused by the fact that the tensioning plate under the action of the tensioner applies excessive pressure to the chain is avoided. For example, the opening and closing of the unloading channel can be controlled by providing a controllable on-off valve; the relief passage may be provided as a passage that can be automatically opened and closed, such as a passage that has a large flow resistance and allows oil to pass therethrough only when the pressure difference is sufficiently large. In addition, the check valve of the present invention can be applied to other situations requiring unloading in addition to timing chain tensioners for engines.

In some embodiments of the present invention, the unloading passage includes a first oil groove 51, a second oil groove 52, and a third oil groove 53, wherein the first oil groove 51 is arranged in a spiral shape, the first oil groove 51 is adapted to communicate with the chamber on one side of the check valve body 5 through the second oil groove 52, and the first oil groove 51 is adapted to communicate with the chamber on the other side of the check valve body 5 through the third oil groove 53.

It should be noted that, referring to fig. 1 to 4, the check valve of the present invention is installed between the first chamber 1 and the second chamber 4, and functions to isolate the first chamber 1 and the second chamber 4, so that the oil can form a larger oil pressure damping in the second chamber 4, and an unloading channel is provided on the check valve body 5. In operation, firstly, oil is pumped from the bottom of the shell of the engine to the first chamber 1 through the action of an oil pump, as the oil pressure in the first chamber 1 increases, the valve core 54 overcomes the pressure and friction force of the one-way valve spring 55, the oil channel between the first chamber 1 and the second chamber 4 is opened, a pressure supporting tensioning plate large enough is formed in the oil channel after the oil enters the second chamber 4, when the tensioning plate reversely compresses the plunger 3, and when the pressure difference between the first chamber 1 and the second chamber 4 reaches a design threshold value, a part of the oil in the second chamber 4 flows into the first chamber 1 from an unloading channel formed by the second oil groove 52, the first oil groove 51 and the third oil groove 53 in sequence, and the other part of the oil flows into the first chamber 1 from the clearance oil channel 7 again or flows into the oil bottom shell of the engine, and the oil flowing out of the second chamber 4 from the unloading channel flows into the first chamber 1 through the clearance oil channel 7 only occupies a small part of the oil channel, as the plunger 3 reciprocates between the first chamber 1 and the second chamber 4 is in order to avoid the long-term damage of the oil pressure of the chain, and the oil pressure in the first chamber 4 can be prolonged.

A second aspect of the present invention provides a tensioning device comprising: the check valve, the shell 2 and the plunger 3 in the technical scheme are arranged, the shell 2 is provided with a sliding channel, the plunger 3 is slidably connected in the sliding channel and can extend out of the sliding channel, and the shell 2 and the sliding channel are enclosed to form a preset cavity; the check valve body 5 is provided in the predetermined chamber and divides the predetermined chamber into a first chamber 1 and a second chamber 4; the one-way valve is configured to: allowing the medium in the first chamber 1 to flow into the second chamber 4; the unloading channel is respectively communicated with the first chamber 1 and the second chamber 4, and is configured to: when the pressure difference between the first chamber 1 and the second chamber 4 reaches a threshold value, a part of the medium in the second chamber 4 can flow into the first chamber 1 along the relief channel.

It should be noted that, the conventional tensioner installs the check valve in the tensioner cavity, when the plunger receives the pressure of tensioning plate, the engine oil pressure in the tensioner cavity can continuously increase, but under the effect of check valve, the engine oil in the tensioner cavity can only flow to the oil storage chamber through the clearance between piston and the casing, but the clearance between piston and the casing is less, the oil pressure difference that forms in the tensioner cavity is great, leads to the chain of tensioning plate effect to receive too big and take place to damage for a long time easily, influences the life of chain. In the invention, referring to fig. 1 to 4, the tensioning device comprises a shell 2 and a plunger 3, a sliding channel is formed in the shell 2, the plunger 3 can move in the sliding channel, one end of the plunger 3 can extend out of the sliding channel, the sliding channel and the shell 2 enclose a preset chamber, a check valve main body 5 is arranged in the check valve main body 5 and divides the preset chamber into a first chamber 1 and a second chamber 4, oil can reciprocate between the first chamber 1 and the second chamber 4 along with the circulating operation of the tensioner, when oil is pumped to the first chamber 1 from the bottom of a shell of an engine through the action of an oil pump, the oil pressure in the first chamber 1 is larger and larger along with the continuous supply of the oil, when the acting force of the oil generated by the oil on the valve core 54 is larger than a design threshold value, the pressure and friction force of a check valve spring 55 are overcome, the oil channel between the first chamber 1 and the second chamber 4 are opened, the oil flows from the first chamber 1 to the second chamber 4, a pressure difference is formed between the first chamber 1 and the second chamber 4, when the pressure difference reaches the designed threshold value, and the oil pressure in the second chamber 4 is increased by the second chamber is in a proper range through the second channel, and the proper service life of the chain can be further prolonged.

In some embodiments of the present invention, the plunger 3 has a first end and a second end, the first end can extend out of the sliding channel, the second end is provided with a groove 31, and the groove 31 and the sliding channel enclose a predetermined chamber. When the plunger 3 protrudes from the housing 2 in the axial direction, the first end can protrude out of the sliding channel and rest on the tensioning plate, so that the chain is kept in a tensioned state. In the working process, oil enters the first chamber 1 and the second chamber 4 through the groove 31 on the second end, so that the normal working of the tensioner is ensured.

In some embodiments of the invention, further comprising an elastomer 13; the inner wall of the groove 31 forms a stepped surface 311, and the elastic body 13 is connected between the inner wall of the sliding passage and the check valve body 5 and adapted to abut the check valve body 5 against the stepped surface 311. It should be noted that, referring to fig. 1, the elastic member 13 may be a spring, one end of the elastic member 13 abuts against a side wall forming the second chamber 4, the other end abuts against the check valve main body 5, and the elastic member 13 may press the elastic member 13 against the step surface 311, so that limiting of the elastic member 13 may be achieved. When the plunger 3 is retracted, the elastic member 13 is in a compressed state; when the plunger 3 is extended, the elastic member 13 is restored, and the reaction force generated by the elastic member can ensure the stability of the timing chain system during the engine starting stage.

In some embodiments of the present invention, a clearance channel 7 is formed between the outer wall of the plunger 3 and the inner wall of the sliding channel, the housing 2 is provided with a first oil hole 6, the first oil hole 6 is communicated with the clearance channel 7, and the inner wall of the groove 31 is provided with a second oil hole 15, and the second oil hole 15 is communicated with the clearance channel 7. A clearance channel 7 is formed between the outer wall of the plunger 3 and the inner wall of the slide channel, and specifically, the clearance channel 7 is defined by a strip-shaped groove formed in the outer wall of the plunger 3 and the inner wall of the slide channel, wherein the strip-shaped groove extends in the extending direction of the plunger 3. A first oil hole 6 is formed in the shell 2, a second oil hole 15 is formed in the inner wall of the groove 31, the first oil hole 6 and the second oil hole 15 are communicated with the clearance channel 7, and the cross-sectional area of the clearance oil channel 7 is smaller than that of the first oil hole 6 and the second oil hole 15. In an initial state of starting operation of the tensioner, oil is pumped to the first chamber 1 from the first oil hole 6 and the second oil hole 15 through the oil pump, with continuous supply of the oil, the oil pressure in the first chamber 1 is larger and larger, the oil directly reaches a design threshold value, a circulation oil duct is formed between the first chamber 1 and the second chamber 4, the oil flows from the first chamber 1 to the second chamber 4, when the pressure difference between the first chamber 1 and the second chamber 4 reaches the design threshold value, most of the oil in the second chamber 4 flows into the first chamber 1 through the unloading channel, and the rest of the oil flows into the first chamber 1 through the clearance channel 7, and only a small part of the oil flows into an oil pan of the engine through the clearance channel 7.

In some embodiments of the present invention, the clearance passage 7 includes a first portion and a second portion, the first portion having a smaller cross-sectional area than the second portion, the first oil hole 6 and the second oil hole 15 communicating into the second portion, respectively, the first portion extending in the axial direction of the plunger 3 and communicating into the second oil chamber 4. When the pressure difference between the first chamber 1 and the second chamber 4 reaches a designed threshold value, a part of oil in the second chamber 4 passes through the first portion and the second portion, a part of oil enters the first chamber 1 through the second oil hole 15, and a part of oil flows into an oil pan of the engine through the first oil hole 6. The first part sectional area is smaller than the second part sectional area, so that most of the oil in the second chamber 4 flows into the first chamber 1 through the unloading channel to a certain extent.

In some embodiments of the invention, the plunger 3 is slidable between a first extreme position and a second extreme position; when the plunger 3 is in the first limit position, the volume of the second chamber 4 is a first value, and the distance between the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 is a first distance; when the plunger 3 is in the second limit position, the volume of the second chamber 4 is a second value, and the distance between the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 is a second distance; the first value is less than the second value and the first distance is less than the second distance. During the compression of the tensioning plate by the plunger 3, the plunger 3 will extend out of the housing 2 in the axial direction of the sliding channel until it moves to the second limit position, whereby the limit volume of the second chamber 4 is relatively large due to the extension of the plunger 3 out of the housing 2. As for the first oil hole 6, the relative position thereof is unchanged, and the second oil hole 15 is extended along with the plunger 3, the second distances of the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 are also relatively large; when the tensioning plate compresses the plunger 3 in opposite directions, the plunger 3 will move along the axial direction of the sliding channel into the housing 2 until it moves to the first extreme position, whereby the first value of the extreme volume of the second chamber 4 is relatively small as a result of the movement of the plunger 3 into the housing 2. The second oil hole 15 moves into the housing 2 as the plunger 3, and the first distance between the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 is also relatively small.

In some embodiments of the present invention, referring to fig. 1 to 3, a ratchet spring 8 and a ratchet 9 connected to the ratchet spring 8 are installed on the housing 2, and teeth on the ratchet 9 are engaged with teeth on the plunger 3. In the initial state, the ratchet spring 8 is compressed, and since the teeth on the ratchet 9 mesh with the teeth on the plunger 3, the resulting meshing force can drive the plunger 3 to move toward the tensioning plate, and as the tensioning plate compresses the plunger 3 in the opposite direction, the plunger 3 moves toward the housing 2, and the ratchet spring 8 is in a stretched state. It should be emphasized that the middle position of the ratchet 9 is provided with the pin hole 11, the locating pin 10 can be inserted into the pin hole 11, the locating pin 10 is further sleeved with the locating pin piece 12, the installation position relationship between the ratchet 9 and the shell 2 can be ensured by arranging the locating pin piece 12, the locating pin piece 12 is further provided with the through holes, the bolt 14 is sequentially inserted into the through holes on the locating pin piece 12 and the corresponding holes on the shell 2, and therefore, when the tensioner is not assembled on an engine, the plunger 3 is ejected by the elastic piece 13, the installation state of the tensioner is changed, and the tensioner cannot be installed on the engine. Note that during the movement of the ratchet 9, the plug 14 needs to be pulled out.

As a relatively preferred embodiment of the tensioning device of the present invention, it comprises: the device comprises a one-way valve, a shell 2 and a plunger 3, wherein the shell 2 is provided with a sliding channel, the plunger 3 is slidably connected in the sliding channel and can extend out of the sliding channel, and the shell 2 and the sliding channel enclose a preset cavity; the check valve body 5 is provided in the predetermined chamber and divides the predetermined chamber into a first chamber 1 and a second chamber 4; the one-way valve is configured to: allowing the medium in the first chamber 1 to flow into the second chamber 4; the unloading channel is respectively communicated with the first chamber 1 and the second chamber 4, and is configured to: when the pressure difference between the first chamber 1 and the second chamber 4 reaches a threshold value, a part of medium in the second chamber 4 can flow into the first chamber 1 along the unloading channel, the plunger 3 is provided with a first end and a second end, the first end can extend out of the sliding channel, the second end is provided with a groove 31, the groove 31 and the sliding channel enclose a preset chamber, and the plunger further comprises an elastomer 13; the inner wall of the groove 31 forms a stepped surface 311, and the elastic body 13 is connected between the inner wall of the sliding passage and the check valve body 5 and adapted to abut the check valve body 5 against the stepped surface 311. A gap channel 7 is formed between the outer wall of the plunger 3 and the inner wall of the sliding channel, a first oil hole 6 is formed in the shell 2, the first oil hole 6 is communicated with the gap channel 7, a second oil hole 15 is formed in the inner wall of the groove 31, the second oil hole 15 is communicated with the gap channel 7, the gap channel 7 comprises a first part and a second part, the sectional area of the first part is smaller than that of the second part, the first oil hole 6 and the second oil hole 15 are respectively communicated into the second part, the first part extends along the axial direction of the plunger 3 and is communicated into the second oil cavity 4, the gap channel 7 is surrounded by a strip-shaped groove formed in the outer wall of the plunger 3 and the inner wall of the sliding channel, the strip-shaped groove extends along the extending direction of the plunger, the sectional area of the gap oil channel 7 is smaller than that of the first oil hole 6 and the second oil hole 15, and the plunger 3 can slide between a first limit position and a second limit position; when the plunger 3 is in the first limit position, the volume of the second chamber 4 is a first value, and the distance between the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 is a first distance; when the plunger 3 is in the second limit position, the volume of the second chamber 4 is a second value, and the distance between the first oil hole 6 and the second oil hole 15 in the extending direction of the plunger 3 is a second distance; the first value is smaller than the second value, the first distance is smaller than the second distance, the ratchet spring 8 and the ratchet 9 connected with the ratchet spring 8 are installed on the shell 2, teeth on the ratchet 9 are meshed with teeth on the plunger 3, a pin hole 11 for inserting the positioning shaft 10 is formed in the ratchet 9, and the positioning pin piece 12 is further installed on the positioning shaft 10 so as to ensure the installation position relation between the ratchet 9 and the shell 2.

When the hydraulic oil pump works, firstly, oil is pumped from the oil pan of the engine to the first chamber 1 through the first oil hole 6 and the second oil hole 15, with continuous supply of the oil, the oil pressure in the first chamber 1 is larger and larger, when the acting force of the oil pressure generated by the oil on the valve core 54 is larger than a design threshold value, the valve core 54 overcomes the pressure and friction force of the check valve spring 55, a communication oil channel is formed between the first chamber 1 and the second chamber 4, the oil flows into the second chamber 4 from the first chamber 1, and a sufficient pressure is formed in the oil to push the plunger 3 to tightly press against the tensioning plate. When the tensioning plate compresses the plunger 3 in the opposite direction, the plunger 3 moves into the housing 2, and when the pressure difference between the first chamber 1 and the second chamber 4 reaches a designed threshold value, most of the oil in the second chamber 4 flows into the first chamber 1 through the unloading channel formed by the second oil groove 52, the first oil groove 51 and the third oil groove 53, and a part of the oil flows into the first chamber 1 through the clearance channel 7, and only a small part of the oil flows into the oil pan of the engine through the clearance channel 7. Along with the reciprocating movement of the plunger 3, oil flows back and forth between the first chamber 1 and the second chamber 4, so that the oil pressure of the second chamber 4 of the tensioner can be quickly reduced, damage to the chain due to overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

A third aspect of the present invention provides an engine, including the tensioning device of the above technical solution, the tensioning device is arranged obliquely relative to a horizontal plane, and it should be noted that, due to the oblique arrangement of the tensioning device, the oil storage function of the first chamber 1 can be ensured, in particular, most of the oil flowing out of the high-pressure chamber 1 of the second chamber 4 flows into the first chamber 1, and due to the oblique arrangement of the first chamber 1, when the oil enters, the oil can accumulate at the bottom of the first chamber 1 and cannot flow to the engine oil pan. The included angle between the axis of the first chamber 1 and the horizontal plane is 30-60 degrees, preferably 45 degrees, so as to maximally realize the oil storage function of the first chamber 1. It should be emphasized that in order to ensure the normal operation of the tensioner, it is necessary to continuously inject oil into the second chamber 4, since the first chamber 1 stores a large portion of oil, during each working cycle of the tensioner, the oil required for working directly flows into the second chamber 4 from the first chamber 1, and only a small portion of the oil needs to be pumped again from the engine sump, and since the oil pump is driven by the engine, the energy consumption of the engine can be saved to a large extent. Along with the reciprocating movement of the plunger 3, oil flows back and forth between the first chamber 1 and the second chamber 4, so that the oil pressure in the second chamber 4 of the tensioner can be quickly reduced, damage to the chain due to overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

According to the invention, the engine comprises the power assembly, the oil pressure in the cavity of the tensioner can be quickly reduced, so that the damage to the chain caused by overlarge long-term pressure is avoided, and the service life of the chain is prolonged.

A fifth aspect of the present invention provides a vehicle employing the aforementioned powertrain or engine, capable of rapidly reducing oil pressure in a tensioner cavity, thereby avoiding damage to a chain due to long-term overpressure, and thereby extending the service life of the chain.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims

1. The one-way valve is characterized by comprising a one-way valve main body (5), wherein an unloading channel is arranged on the one-way valve main body (5).

2. A one-way valve according to claim 1, characterized in that the relief channel comprises a first oil groove (51), the first oil groove (51) being arranged in a spiral.

3. A non-return valve according to claim 1, wherein the relief channel further comprises a second oil groove (52) and a third oil groove (53), the first oil groove (51) being adapted to communicate with the chamber on one side of the non-return valve body (5) through the second oil groove (52), the first oil groove (51) being adapted to communicate with the chamber on the other side of the non-return valve body (5) through the third oil groove (53).

4. A kind of tension device, which is used to make the tension device, characterized by comprising the following steps: a one-way valve as claimed in any one of claims 1 to 3.

5. The tensioner of claim 4, further comprising a housing (2) and a plunger (3);

the shell (2) is provided with a sliding channel, the plunger (3) is connected in the sliding channel in a sliding way and can extend out of the sliding channel, and the shell (2) and the sliding channel are enclosed to form a preset cavity;

the one-way valve body (5) is arranged in the preset cavity and divides the preset cavity into a first cavity (1) and a second cavity (4);

the one-way valve is configured to: allowing the medium in the first chamber (1) to flow into the second chamber (4);

The relief channel communicates with the first chamber (1) and the second chamber (4), respectively, the relief channel being configured to: when the pressure difference between the first chamber (1) and the second chamber (4) reaches a threshold value, a portion of the medium within the second chamber (4) can flow into the first chamber (1) along the relief channel.

6. Tensioner according to claim 5, characterized in that the plunger (3) has a first end and a second end, the first end being able to protrude outside the sliding channel, the second end being provided with a groove 31, the groove (31) and the sliding channel enclosing the predetermined chamber.

7. A tensioner according to claim 6, characterized in that it further comprises an elastomer (13); the inner wall of the groove (31) forms a step surface (311), and the elastic body (13) is connected between the inner wall of the sliding channel and the one-way valve body (5) and is suitable for abutting the one-way valve body (5) on the step surface (311).

8. The tensioning device according to claim 6, characterized in that a clearance channel (7) is formed between the outer wall of the plunger (3) and the inner wall of the sliding channel, a first oil hole (6) is formed in the housing (2), the first oil hole (6) is communicated with the clearance channel (7), a second oil hole (15) is formed in the inner wall of the groove (31), and the second oil hole (15) is communicated with the clearance channel (7).

9. A tensioner according to claim 8, characterised in that the clearance channel (7) comprises a first portion and a second portion, the first portion having a cross-sectional area smaller than the second portion, the first oil hole (6) and the second oil hole (15) communicating respectively into the second portion, the first portion extending in the axial direction of the plunger (3) and communicating into the second oil chamber (4).

10. Tensioner according to claim 8, characterized in that the clearance channel (7) is defined by a strip-shaped groove provided on the outer wall of the plunger (3) and the inner wall of the sliding channel, which strip-shaped groove extends in the extension direction of the plunger.

11. Tensioner according to claim 8, characterized in that the plunger (3) is slidable between a first limit position and a second limit position;

When the plunger (3) is at a first limit position, the volume of the second chamber (4) is a first value, and the distance between the first oil hole (6) and the second oil hole (15) in the extending direction of the plunger (3) is a first distance;

when the plunger (3) is at a second limit position, the volume of the second chamber (4) is a second value, and the distance between the first oil hole (6) and the second oil hole (15) in the extending direction of the plunger (3) is a second distance;

the first value is less than the second value and the first distance is less than the second distance.

12. A tensioner according to claim 9, characterized in that the cross-sectional area of the clearance oil passage (7) is smaller than the cross-sectional areas of the first oil hole (6) and the second oil hole (15).

13. A tensioner according to claim 5, characterised in that the housing (2) is fitted with a ratchet spring (8) and a ratchet (9) connected to the ratchet spring (8), the teeth on the ratchet (9) being engaged with the teeth on the plunger (3).

14. The tensioning device according to claim 13, characterized in that the ratchet (9) is provided with a pin hole (11) into which a positioning shaft (10) is inserted, and a positioning pin piece (12) is further installed on the positioning shaft (10) so as to ensure the installation positional relationship between the ratchet (9) and the housing (2).

15. An engine comprising a tensioner as claimed in any one of claims 4 to 14, the tensioner being disposed obliquely to the horizontal plane.

16. A power assembly is characterized in that, comprising the engine of claim 15.

17. A vehicle comprising the engine or powertrain of claim 16.