CN214247447U - Connecting rod pin, variable compression ratio mechanism connecting rod assembly and engine - Google Patents

Abstract

The utility model provides a connecting rod round pin and variable compression ratio mechanism link assembly and engine, the connecting rod round pin on be equipped with the axial through-hole that runs through the setting, and with the through-hole is the mounting hole that the angle was arranged, the mounting hole runs through the both ends of the radial direction of connecting rod round pin, just the mounting hole with the through-hole sets up in cross, and in the mounting hole cartridge is fixed with oil pipe, because of oil pipe's setting, in form the lubricated oil circuit of connecting rod round pin in the mounting hole. The utility model discloses a connecting rod round pin passes through oil pipe's setting, compares in direct processing oil circuit structure on the connecting rod round pin, can need not consider the leakproofness of oil circuit, and can make the aperture of through-hole further increase to when processing sets up oil pipe's mounting hole, also can get rid of partial material from this, and then can set up lubricated oil circuit on the connecting rod round pin, also can do benefit to the quality that reduces the connecting rod round pin.

Description

Connecting rod pin, variable compression ratio mechanism connecting rod assembly and engine

Technical Field

The utility model relates to a variable compression ratio engine technical field, in particular to connecting rod round pin, simultaneously, the utility model discloses still relate to an use variable compression ratio mechanism link assembly that has this connecting rod round pin to and have the engine of this variable compression ratio mechanism link assembly.

Background

When the engine works, if the same compression ratio is adopted for different working conditions and loads, the defects of low fuel efficiency, poor economy and high emission are inevitably caused, and the variable compression ratio technology is developed to overcome the defects of a single compression ratio. Among various types of variable compression ratio mechanisms, a multi-link variable compression ratio mechanism, which employs an eccentric shaft and a multi-link mechanism to cooperate with each other so as to be driven by the multi-link mechanism when the eccentric shaft is driven to rotate, thereby realizing the change of the top dead center of an engine piston, has become the research and development direction of many vehicle enterprises.

In the multi-link type variable compression ratio mechanism, the links are generally rotationally connected by link pins, and the current multi-link structure generally adopts a splash lubrication or pressure lubrication method. In the prior art, a splash lubrication mode is adopted, the lubrication condition of the assembled parts is poor, and locking faults are easy to occur. Adopt the pressure lubrication mode to need process the oilhole on the connecting rod round pin in order to form lubricated oil circuit, for the leakproofness of guaranteeing the oil circuit this moment, the quality of connecting rod round pin often can increase correspondingly, but it can influence the mechanism atress, and also does not benefit to the whole lightweight design of mechanism.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a connecting rod pin, which is capable of setting a lubrication oil path and is also beneficial to reducing the quality of the connecting rod pin.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a connecting rod round pin, be equipped with the axial on the connecting rod round pin and run through the through-hole that sets up, and with the through-hole is the mounting hole that the angle was arranged, the mounting hole runs through the both ends of the radial direction of connecting rod round pin, just the mounting hole with the through-hole setting of crossing, and in the mounting hole cartridge is fixed with oil pipe, because of oil pipe's setting, in form the lubricated oil circuit of connecting rod round pin in the mounting hole.

Furthermore, the mounting hole has a middle hole section located in the middle, and end hole sections with inner diameters larger than the middle hole section are respectively arranged at the two ends of the mounting hole, and end pipe sections in interference fit with the inner walls of the end hole sections are respectively constructed at the two ends of the oil pipe.

Further, the inner diameter of the middle hole section is 3-4mm, and the difference between the inner diameters of the end hole section and the middle hole section is not more than 1.5 mm.

Further, the inner diameter of the oil pipe between the end pipe sections at two ends is 1-2 mm.

Furthermore, the oil pipe is in interference fit with the inner wall of the mounting hole, and the part of the oil pipe in the through hole is arranged in an outward bulging mode.

Further, the inner diameter of the mounting hole is between 3 and 4mm, and the inner diameter of the oil pipe outside the outer drum part is between 1 and 2 mm.

Furthermore, at least at the opening of the mounting hole, which is located at the end of the connecting rod pin, the end of the oil pipe is spaced from the opening of the mounting hole and is located inside the mounting hole.

Compared with the prior art, the utility model discloses following advantage has:

connecting rod round pin pass through oil pipe's setting, through mounting hole and oil pipe's in it setting to form the connecting rod round pin lubricating oil circuit that is located on the connecting rod round pin, compare in directly processing oil circuit structure on the connecting rod round pin, can need not consider the leakproofness of oil circuit, and can make the aperture of through-hole further increase, and when processing sets up oil pipe's mounting hole, also can get rid of partial material from this, and then can set up lubricating oil circuit on the connecting rod round pin in, also can do benefit to the quality that reduces the connecting rod round pin.

Another object of the utility model is to provide a variable compression ratio mechanism link assembly, locate bent epaxial regulation connecting rod including rotating, and rotate respectively connect in the execution connecting rod and the drive connecting rod at regulation connecting rod both ends, execute the connecting rod with at least one of them of drive connecting rod is through as above the connecting rod round pin rotate connect in on the regulation connecting rod, and in be equipped with in the regulation connecting rod with the lubricated oil circuit of regulation connecting rod that oil circuit links to each other in the bent axle, the lubricated oil circuit of connecting rod round pin with the lubricated oil circuit of regulation connecting rod links to each other.

Furthermore, the adjusting connecting rod is arranged on the crankshaft through a pivot hole formed in the adjusting connecting rod, the connecting rod pin is rotatably connected into a connecting hole in the adjusting connecting rod, the adjusting connecting rod lubricating oil path comprises an oil hole and an oil hole, one end of the oil hole is communicated with the pivot hole, and the other end of the oil hole is connected with the connecting rod pin lubricating oil path.

The utility model discloses a variable compression ratio mechanism link assembly can set up lubricated oil circuit on the connecting rod round pin through adopting as above connecting rod round pin to when connecting the position and carrying out lubrication to carrying out connecting rod and drive connecting rod, also can reduce the quality of connecting rod round pin, do benefit to the whole lightweight design of mechanism, and have fine practicality.

Furthermore, the utility model discloses an engine is also proposed, be equipped with variable compression ratio mechanism in the engine, just have in the variable compression ratio mechanism as above variable compression ratio mechanism link assembly.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a variable compression ratio mechanism according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a connecting rod pin according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a mounting hole according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another form of the mounting hole according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of another form of a connecting rod pin according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a lubricating oil passage of the adjusting connecting rod according to the embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a lubricating oil passage of the adjusting link according to the embodiment of the present invention;

fig. 8 is an assembly view of a connecting rod pin according to an embodiment of the present invention;

description of reference numerals:

1. a piston; 2. a crankshaft; 3. an execution connecting rod; 4. adjusting the connecting rod; 5. a drive link; 6. an eccentric shaft; 7. a link pin; 8. an oil pipe;

401. a pivot hole; 402. a link arm; 403. connecting holes; 404. a straight oil hole; 405. a transverse oil hole; 406. an oblique oil hole;

701. a through hole; 702. mounting holes; 7021. an end bore section.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

While the present embodiment relates to a link pin, the present embodiment also relates to a variable compression ratio mechanism link assembly to which the link pin 7 is applied, and for convenience of description and understanding of the link pin 7, in the present embodiment, the structure, characteristics, and the like of the link pin 7 will be specifically described in the description of the variable compression ratio mechanism link assembly.

Further, it should be noted that although the link pin 7 is provided in the connecting rod assembly in the present embodiment, it is undeniable that the link pin 7 of the present embodiment may be used in other application scenarios similar to the connecting rod assembly, in addition to the variable compression ratio mechanism connecting rod assembly described below, and the specific use of the link pin 7 in other scenarios may be referred to the following description.

Before describing the connecting rod assembly, it is necessary to describe the variable compression ratio mechanism of the present embodiment, that is, the variable compression ratio mechanism of the multi-connecting rod type which uses the eccentric shaft 6 to cooperate with the multi-connecting rod mechanism to be driven by the multi-connecting rod mechanism when driving the eccentric shaft 6 to rotate, so as to realize the change of the top dead center of the piston 1.

As shown in fig. 1, the multi-link type variable compression ratio mechanism of the present embodiment is constructed by including a piston 1, an actuating connecting rod 3 having one end hingedly connected to the piston 1, a driving connecting rod 5 having one end rotatably connected to an eccentric wheel on an eccentric shaft 6, and an adjusting connecting rod 4 rotatably provided on a crankshaft 2 and having both ends rotatably connected to the actuating connecting rod 3 and the driving connecting rod 5, respectively. The adjusting connecting rod 4 is rotatably mounted on a connecting rod journal of the crankshaft 2, and the actuating connecting rod 3 and the adjusting connecting rod 4 of the drive connecting rod 5 are rotatably connected by a connecting rod pin 7 according to the present embodiment. The two end parts of the connecting rod pin 7 are in interference fit with the adjusting connecting rod 4, and the middle part of the connecting rod pin is in clearance fit with the executing connecting rod 3 or the driving connecting rod 5.

The eccentric shaft 6 is generally driven by a motor, a speed reducer is arranged between the eccentric shaft and the motor, when the variable compression ratio mechanism works, the engine ECU sends a control instruction to the motor according to the current engine load, and the motor rotates to drive the eccentric shaft 6 to rotate through the speed reducer. The rotation of the eccentric shaft 6 is transmitted via the drive connecting rod 5, the adjusting connecting rod 4 and the actuating connecting rod 2, so that the top dead center of the piston 1 is changed, thereby achieving the adjustment of the engine compression ratio.

Furthermore, instead of having both the actuating link 3 and the drive link 5 connected to the adjusting link 4 via the link pin 7, as an alternative embodiment, it is of course also possible to have one of the actuating link 3 and the drive link 5 pivotally connected to the adjusting link 4 via the link pin 7 according to the present embodiment. It should be noted that whether the actuator link 3 and the drive link 5 are connected by the link pin 7, respectively, or only one of them is connected by the link pin 7, the same applies to the actuator link 3 and the drive link 5 based on the lubrication path formed by the link pin 7 as described below. Therefore, the arrangement of the lubrication path is described below by taking only the actuator connecting rod 3 as an example.

The variable compression ratio mechanism connecting rod assembly of the present embodiment includes the adjusting connecting rod 4 as described above, and the actuating connecting rod 3 and the driving connecting rod 5 rotatably connected to both ends of the adjusting connecting rod 4, respectively. In the overall design of the link pin 7 of the present embodiment, the link pin 7 is provided with a through hole 701 axially penetrating therethrough, and mounting holes 702 arranged at an angle to the through hole 701 and penetrating through both ends of the link pin 7 in the radial direction, the through hole 701 is substantially a lightening hole opened in the link pin 7, the mounting holes 702 intersect with the through hole 701, and an oil pipe 8 is also inserted and fixed in the mounting holes 702.

By the arrangement of the oil pipe 8, the link pin lubricating oil path is formed in the mounting hole 702 of the link pin 7 in this embodiment. In addition, in the specific arrangement of the mounting hole 702, in this embodiment, one end of the mounting hole 702 is opened at the end of the link pin 7, and the other end is opened at the middle of the link pin 7.

At this time, an exemplary structure of the link pin 7 of the present embodiment may be as shown in fig. 2 and 3, in which the mounting hole 702 provided radially through the link pin 7 has a middle hole section in the middle and end hole sections 7021 having larger inner diameters than the middle hole section are provided at both ends. The middle hole section is also the part indicated by the reference mark a in fig. 3, and corresponds to the above three-section type formation of the installation hole 702, and both ends of the oil pipe 8 are also respectively provided with an end pipe section which is in interference fit with the inner wall of the end hole section 7021.

The inner diameter of the end pipe sections at the two ends of the oil pipe 8 is larger than that of the other parts of the oil pipe 8, namely the end pipe sections are expanded sections formed at the end parts of the oil pipe 8. In specific implementation, the arrangement of the oil pipe 8 in the mounting hole 702 may be generally that after the oil pipe 8 in clearance fit with the mounting hole 702 is inserted into the mounting hole 702, the two ends of the oil pipe 8 are respectively machined to form end pipe sections of an expanded diameter structure, and the end pipe sections are in interference fit with the inner walls of the end hole sections 7021 at the two ends of the mounting hole 702.

Through the interference fit, the sealing between the two ends of the oil pipe 8 and the mounting hole 702 can be realized, and meanwhile, the oil pipe 8 can be positioned in the mounting hole 702 by utilizing the end hole segment 7021 of the mounting hole 702 with the two ends in the stepped shape and the end pipe segment of the oil pipe 8, so that the oil pipe 8 is inserted and fixed in the mounting hole 702.

In this embodiment, the inner diameter of the middle section of the installation hole 702 may be 3-4mm, and the difference between the inner diameters of the end section 7021 and the middle section should be no greater than 1.5 mm. In addition, for the oil pipe 8, the inner diameter of the oil pipe 8 between the end pipe sections at both ends, that is, the middle part of the oil pipe 8, can be between 1 and 2 mm. In practice, for example, the inner diameter of the central bore segment may be 3mm, 3.2mm, 3.5mm or 4mm, the difference between the inner diameters of the end bore segment 7021 and the central bore segment may be 0.5mm, 1mm, 1.2mm or 1.5mm, and the inner diameter of the central portion of the oil pipe 8 may be 1mm, 1.2mm, 1.5mm, 1.8mm or 2 mm.

In addition, in addition to the structural forms shown in fig. 2 and 3, another exemplary structural form of the connecting rod pin 7 of the present embodiment is shown in fig. 4 and 5, in which the cross section of each position of the mounting hole 702 is the same, the oil pipe 8 is in interference fit with the inner wall of the mounting hole 702, and the portion of the oil pipe 8 located in the through hole 701 is also provided for the outer drum.

As for the arrangement form of the oil pipe 8 shown in fig. 5, in a specific implementation, the oil pipe 8 is inserted into the installation hole 702 in a clearance fit manner, and then pressure is applied to both ends of the oil pipe 8, or high-pressure liquid is introduced, so that the oil pipe 8 generates plastic deformation to be in interference fit with the inner wall of the installation hole 702, and the part located in the through hole 701, that is, the part indicated by the reference sign B, has no external constraint characteristic, so that the part bulges outwards.

Through the interference fit with the inner wall of the mounting hole 702, the sealing between the oil pipe 8 and the mounting hole 702 is realized, and the outer bulge area on the oil pipe 8 is utilized, so that the oil pipe 8 can be limited, and the oil pipe 8 is inserted and fixed in the mounting hole 702.

In this configuration, the internal diameter of the bore 702 is between 3 and 4mm and the internal diameter of the tubing 8 outside the outer drum region is between 1 and 2mm, consistent with the previous configuration. In addition, it should be noted that in the present embodiment, at the opening of the installation hole 702, the end of the oil pipe 8 is also spaced from the opening of the installation hole 702, so that the end of the oil pipe 8 is actually located inside the installation hole 702. The design can facilitate the butt-joint communication of a connecting rod pin lubricating oil path formed in the mounting hole 702 and the inclined oil hole 406, and reduces the assembly difficulty.

However, it should be noted that, in addition to having both ends of the oil pipe 8 inside the mounting hole 702, the present embodiment may also have only the end of the oil pipe 8 inside the mounting hole 702 at the opening of the mounting hole 702 at the end of the link pin 7. In addition, since the inner diameter of the opening of the mounting hole 702 is generally larger than that of the oblique oil hole 406, this has an influence on the lubrication efficiency. In order to increase the flow rate of the lubricating oil as much as possible and improve the lubricating efficiency, the present embodiment preferably makes the size of the inner hole of the oil pipe 8 not larger than the size of the oblique oil hole 406.

In this embodiment, the through hole 701 and the mounting hole 702 of the link pin 7 are formed by machining, and the oil pipe 8 may be made of a material having low density and good ductility. When the connecting rod pin 7 of the present embodiment is applied to the connecting rod assembly, an adjusting connecting rod lubricating oil passage connected to the lubricating oil passage in the crankshaft 4 is also provided in the adjusting connecting rod 4, and the connecting rod pin lubricating oil passage in the connecting rod pin 7 is connected to the adjusting connecting rod lubricating oil passage, so that the lubricating oil finally enters the position of the connecting rod pin 7 from the crankshaft 4 to lubricate the rotation connecting position of the actuating connecting rod 3 or the driving connecting rod 5.

As shown in fig. 6 and 7, the adjusting link 4 is provided on the crankshaft 2 through a pivot hole 401 formed on itself, and the link pin 7 is rotatably coupled to a coupling hole 403 on the adjusting link 4, the coupling hole 403 being located on a link arm 402 of the adjusting link 4. As an exemplary configuration, the adjusting link lubricating oil passage of the present embodiment includes an oil hole having one end communicating with the pivot hole 401 and the other end connected to the link pin lubricating oil passage.

At this time, the oil holes specifically include a straight oil hole 404, a transverse oil hole 405 connected to the other end of the straight oil hole 404, and an oblique oil hole 406 connected to the transverse oil hole 405 and having one end communicated with the connecting hole 403.

Wherein, the straight oil hole 404 is communicated with the lubricating oil path in the crankshaft, arranged along the radial direction of the pivot hole 401, and located in the middle of the thickness direction of the adjusting connecting rod 4, so as to ensure the structural strength of the adjusting connecting rod 4. The transverse oil hole 405 is axially arranged along the pivot hole 401, and when the transverse oil hole 405 is formed, a hole can be formed in one side of the adjusting connecting rod 4, and one end of the transverse oil hole is sealed after the transverse oil hole is communicated with the straight oil hole 404. The oblique oil hole 406 extends into the link arm 402 to have one end thereof connected to the link pin lubricating oil passage as described above, and the present embodiment is a preferred embodiment in which the other end of the oblique oil hole 406 also communicates with the pivot hole 401 without blocking it.

In this embodiment, in addition to the above configuration, it is needless to say that the adjusting link lubrication passage may have another configuration provided in the adjusting link 4, and the communication state between the adjusting link lubrication passage and the link pin lubrication passage may be as shown in fig. 8. The connecting rod assembly of the variable compression ratio mechanism of the embodiment adopts the connecting rod pin 7, and a lubricating oil path can be arranged on the connecting rod pin 7, so that the quality of the connecting rod pin 7 can be reduced while the connecting part of the execution connecting rod 3 and the driving connecting rod 5 is lubricated, the whole lightweight design of the mechanism is facilitated, and the variable compression ratio mechanism has good practicability.

Finally, the present embodiment also relates to an engine in which a variable compression ratio mechanism is provided, and in which the variable compression ratio mechanism connecting rod assembly as described above is provided.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A connecting rod pin (7), characterized in that: be equipped with on connecting rod round pin (7) axial through set up through-hole (701), and with through-hole (701) are mounting hole (702) that the angle was arranged, mounting hole (702) run through connecting rod round pin (7) radial direction's both ends, just mounting hole (702) with through-hole (701) set up in the intersection, and in mounting hole (702) interpolation dress is fixed with oil pipe (8), because of the setting of oil pipe (8), in form connecting rod round pin lubricating oil circuit in mounting hole (702).

2. The link pin of claim 1, wherein: the mounting hole (702) is provided with a middle hole section positioned in the middle, and end hole sections (7021) with the inner diameters of the two ends larger than that of the middle hole section are respectively arranged, and end pipe sections which are in interference fit with the inner walls of the end hole sections (7021) are respectively constructed at the two ends of the oil pipe (8).

3. The link pin of claim 2, wherein: the inner diameter of the middle hole section is 3-4mm, and the difference between the inner diameters of the end hole section (7021) and the middle hole section is not more than 1.5 mm.

4. The link pin of claim 2, wherein: the inner diameter of the oil pipe (8) between the two end pipe sections is 1-2 mm.

5. The link pin of claim 1, wherein: the oil pipe (8) is in interference fit with the inner wall of the mounting hole (702), and the oil pipe (8) is located at the outer drum of the through hole (701).

6. The link pin of claim 5, wherein: the inner diameter of the mounting hole (702) is between 3 and 4mm, and the inner diameter of the oil pipe (8) outside the outer drum part is between 1 and 2 mm.

7. The link pin according to any one of claims 1 to 6, wherein: at least the opening of the mounting hole (702) at the end of the connecting rod pin (7), and the end of the oil pipe (8) is spaced from the opening of the mounting hole (702) and is positioned inside the mounting hole (702).

8. The utility model provides a variable compression ratio mechanism link assembly, includes to rotate and locates regulation connecting rod (4) on bent axle (2), and rotate respectively connect in execute connecting rod (3) and drive connecting rod (5) of adjusting connecting rod (4) both ends, its characterized in that: at least one of the actuating connecting rod (3) and the driving connecting rod (5) is rotatably connected to the adjusting connecting rod (4) by a connecting rod pin (7) according to any one of claims 1 to 7, and an adjusting connecting rod lubricating oil passage connected to a lubricating oil passage in the crankshaft (2) is provided in the adjusting connecting rod (4), and the connecting rod pin lubricating oil passage is connected to the adjusting connecting rod lubricating oil passage.

9. The variable compression ratio mechanism link assembly of claim 8, wherein: the adjusting connecting rod (4) is arranged on the crankshaft (2) through a pivot hole (401) formed in the adjusting connecting rod, the connecting rod pin (7) is connected to a connecting hole (403) in the adjusting connecting rod (4) in a rotating mode, the adjusting connecting rod lubricating oil path comprises an oil hole, one end of the oil hole is communicated with the pivot hole (401), and the other end of the oil hole is connected with the connecting rod pin lubricating oil path.

10. An engine, characterized in that: a variable compression ratio mechanism is provided in the engine, and the variable compression ratio mechanism has therein the variable compression ratio mechanism link assembly described in claim 8 or 9.

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