CN114893295B

CN114893295B - Engine connecting rod and engine

Info

Publication number: CN114893295B
Application number: CN202210583054.XA
Authority: CN
Inventors: 林木森; 樊嘉天; 崔彪; 于洁; 张春丰; 杨振国; 陈后涛; 王树平
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2023-07-04
Anticipated expiration: 2042-05-25
Also published as: CN114893295A

Abstract

The invention belongs to the technical field of automobile parts, and discloses an engine connecting rod and an engine. The engine connecting rod comprises a first connecting part used for being connected with a piston, a second connecting part used for being connected with a crankshaft and an adjusting mechanism, wherein the adjusting mechanism comprises an adjusting component, a transmission component and a shifting component, the first connecting part or the second connecting part is connected with the adjusting component, the adjusting component is configured to adjust the distance between the first connecting part and the second connecting part, the transmission component is connected with the adjusting component in a transmission mode, an external tool can actuate the transmission component so that the adjusting component can adjust the distance between the first connecting part and the second connecting part, the adjusting component is connected with the transmission component through the shifting component, the shifting component is configured to shift the transmission component to a preset position, and the preset position is selected as a position suitable for an external tool to extend into a cylinder body of the engine. The invention can adjust the compression ratio without disassembling the cylinder body of the engine, thereby not only improving the adjusting efficiency, but also ensuring the service life of the engine.

Description

Engine connecting rod and engine

Technical Field

The invention relates to the technical field of automobile parts, in particular to an engine connecting rod and an engine.

Background

In recent years, the global energy price fluctuates drastically, the price advantages of diesel and natural gas alternate, and the market demands for engines capable of realizing dual-fuel driving of diesel and natural gas are urgent. In the research and development of dual-fuel engines, the variable compression ratio technology has great application potential. When diesel is used as the fuel for driving, the thermal efficiency and the maximum power can be improved with a high compression ratio; when natural gas is used as fuel for driving, decreasing the compression ratio can reduce knocking and increase the maximum power. In practical application, the driving mode can be selected according to the specific price of two fuels in the market, and the compression ratio in the cylinder which is matched with the driving mode can effectively ensure the working stability and the fuel economy of the engine.

In the prior art, the compression ratio of the piston cylinder is usually adjusted by adjusting the distance between the first connecting part and the second connecting part, which are connected with the piston and the crankshaft, of the engine connecting rod, however, in the adjusting process, the cylinder body of the engine needs to be disassembled firstly so as to expose the crankshaft or the piston cylinder, and then the crankshaft or the piston cylinder is adjusted, so that the adjusting operation time is long, the crankshaft or the piston cylinder can be polluted, and the service life of the engine is reduced.

Therefore, there is a need to solve the above problems.

Disclosure of Invention

The invention aims to provide an engine connecting rod and an engine, which can adjust the distance between a first connecting part and a second connecting part, which are respectively connected with a piston and a crankshaft, of the engine connecting rod without disassembling a cylinder body of the engine.

To this end, the present invention provides an engine connecting rod including a first connecting portion for connecting with a piston, a second connecting portion for connecting with a crankshaft, and an adjusting mechanism including:

an adjustment assembly, the first connection portion or the second connection portion being connected to the adjustment assembly, the adjustment assembly configured to adjust a spacing between the first connection portion and the second connection portion;

the transmission assembly is connected with the adjusting assembly in a transmission way, and an external tool can actuate the transmission assembly so that the adjusting assembly can adjust the distance between the first connecting part and the second connecting part; a kind of electronic device with high-pressure air-conditioning system

A displacement assembly connected to the transmission assembly by the displacement assembly, the displacement assembly configured to displace the transmission assembly to a preset position selected as a position suitable for the external tool to extend into a cylinder of the engine.

Preferably, the adjusting component is an eccentric component, the eccentric component comprises a first rotating component, the first rotating component is in transmission connection with the transmission component and can rotate around a first rotating shaft, the first connecting part comprises a connecting hole arranged on the first rotating component, and the axis of the connecting hole is arranged at intervals with the first rotating shaft.

Preferably, the first rotating member includes a first worm wheel, the transmission assembly includes a worm, and the displacement assembly includes a second worm wheel, and the worm is rotatably fixed at the preset position and is in transmission connection with the first worm wheel by the second worm wheel.

Preferably, the number of teeth of the first worm wheel is greater than the number of teeth of the second worm wheel.

Preferably, the first rotating member includes a first gear, the transmission assembly includes a second gear, the displacement assembly includes a third gear, the second gear is rotatably fixed at the preset position, and the first gear, the third gear and the second gear are sequentially meshed.

Preferably, the first connection part includes a bush, the first worm wheel is sleeved on the bush and rotates together with the bush, and the connection hole is formed in the bush.

Preferably, the rod body of the engine connecting rod is provided with a containing groove for installing the adjusting mechanism and a through hole for connecting with the bushing, and the through hole penetrates through the groove wall of the containing groove.

Preferably, the adjusting component is an eccentric component, the eccentric component comprises a first rotating piece, the transmission component comprises a second rotating piece, the shifting component comprises a connecting rod, the first rotating piece can rotate around a first rotating shaft, the first connecting part comprises a connecting hole arranged on the first rotating piece, and the axis of the connecting hole is parallel to the first rotating shaft;

the second rotating piece is rotatably fixed at the preset position, one end of the connecting rod is eccentrically hinged to the first rotating piece, and the other end of the connecting rod is eccentrically hinged to the second rotating piece.

Preferably, the adjustment mechanism further comprises a locking assembly configured to lock the transmission assembly.

In another aspect the invention provides an engine comprising a piston, a crankshaft and an engine connecting rod as described above.

The invention has the beneficial effects that: according to the invention, the transmission assembly is shifted to the preset position suitable for the external tool to extend into the cylinder body of the engine through the shifting assembly, so that the distance between the first connecting part and the second connecting part can be adjusted without disassembling the cylinder body of the engine, the efficiency of adjusting the compression ratio of the engine is improved, and the service life of the engine is ensured.

Drawings

FIG. 1 is a schematic view of an engine according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an adjustment mechanism of the engine connecting rod of FIG. 1;

fig. 3 is a schematic view of the structure of a rod body of the engine connecting rod in fig. 2.

In the figure:

11. a cylinder; 12. a piston cylinder liner; 13. a piston; 14. a crankshaft;

21. a rod body; 211. a receiving groove; 212. a through hole; 22. a first connection portion; 23. a second connecting portion; 24. an adjusting mechanism; 241. an adjustment assembly; 2411. a first worm wheel; 2412. a bushing; 24121. a connection hole; 242. a displacement assembly; 2421. a second worm wheel; 2422. needle roller bearings; 243. a transmission assembly; 2431. a worm; 2432. a bearing seat; 244. a locking assembly;

3. an external tool; 31. a first adjusting lever; 32. and a second adjusting rod.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In order to solve the above-mentioned problems, the present embodiment provides an engine, as shown in fig. 1, the engine includes a piston 13, a crankshaft 14 and an engine connecting rod, the engine connecting rod includes a rod body 21, a first connecting portion 22, a second connecting portion 23 and an adjusting mechanism 24, the first connecting portion 22 and the second connecting portion 23 are respectively disposed at two ends of the rod body 21, the first connecting portion 22 is used for connecting with the piston 13, the second connecting portion 23 is used for connecting with the crankshaft 14, the adjusting mechanism 24 includes an adjusting component 241, a shifting component 242 and a transmission component 243, the second connecting portion 23 is connected with the adjusting component 241, the adjusting component 241 is configured to adjust a distance between the first connecting portion 22 and the second connecting portion 23, the transmission component 243 is connected with the adjusting component 241 in a transmission way, the adjusting component 241 is connected with the transmission component 243 by the shifting component 242, the shifting component 243 is configured to a preset position, the preset position is selected to be suitable for the cylinder body of the external tool 3 to extend into the position of the engine 11, thereby the engine can not be connected with the engine 23, and the first connecting portion 23 can not be compressed by the engine can be connected with the second connecting portion 23, the engine can not be connected with the adjusting component 23, and the engine can not be compressed by the adjusting component 23, as long as well as the adjusting component can be connected with the engine can be adjusted.

Referring to fig. 1 to 3, in the present embodiment, the engine includes a cylinder body 11, a cylinder liner 12, a piston 13, a crankshaft 14, a piston cylinder cover and an engine connecting rod, wherein the cylinder liner 12, the piston 13, the crankshaft 14 and the engine connecting rod are all disposed in the cylinder body 11, the cylinder liner 12, the piston 13 and the piston cylinder cover enclose a piston cylinder, fuel enters the piston cylinder from the piston cylinder cover, a first connecting portion 22 of the engine connecting rod is connected to the piston 13, and a second connecting portion 23 of the engine connecting rod is connected to the crankshaft 14.

Since the engine connecting rod is typically connected to the piston 13 and the crankshaft 14 using a connecting pin and a bush, respectively, the first connecting portion 22 includes a piston pin and the second connecting portion 23 includes a bush in this embodiment, and one end of the engine connecting rod is connected to the piston 13 via the piston pin and the other end is connected to the crankshaft 14 via the bush. Preferably, the first connecting portion 22 or the second connecting portion 23 may be provided in an eccentric structure, so that a space between the first connecting portion 22 and the second connecting portion 23 may be adjusted, and thus a compression ratio of the piston cylinder may be changed, and not only is an adjustment precision high, but also a structure is stable, and reliability is high.

Suitably, in this embodiment, the adjusting component 241 is an eccentric component, the eccentric component includes a first rotating member, the first rotating member is in transmission connection with the transmission component 243 and can rotate around a first rotating shaft, the first connecting portion 22 further includes a connecting hole 24121 disposed on the first rotating member, the piston pin is connected with the engine connecting rod through the connecting hole 24121, and an axis of the connecting hole 24121 is spaced from the first rotating shaft, so that a distance between the first connecting portion 22 and the second connecting portion 23 can be changed when the first rotating member is rotated.

By means of the structure, preferably, in the embodiment, the worm and gear structure can be adopted to enable the eccentric assembly to rotate, so that the structure is good in strength and high in adjusting accuracy. The first rotating member includes a first worm wheel 2411, the first worm wheel 2411 can rotate around a first rotation axis, the transmission assembly 243 includes a worm 2431 and a bearing seat 2432, the bearing seat 2432 is fixedly connected to the engine connecting rod, the worm 2431 is connected to the engine connecting rod through the bearing seat 2432, and can rotate around a second rotation axis, and the second rotation axis is disposed at a preset position where the external tool 3 is convenient to extend into the cylinder 11. The shift assembly 242 includes a second worm gear 2421 and a needle bearing 2422, the inner ring of the needle bearing 2422 is sleeved on a third rotating shaft, the third rotating shaft is fixedly connected to the rod body 21 and located between the first rotating shaft and the second rotating shaft, the outer ring of the needle bearing 2422 is connected with the second worm gear 2421, and the worm 2431 is connected to the first worm gear 2411 by the second worm gear 2421 in a transmission manner, so that the first worm gear 2411 can rotate. Wherein the second worm gear 2421 not only can shift the worm 2431 to a preset position suitable for the external tool 3 to extend into the cylinder 11, but also improves the adjustment accuracy of adjusting the interval between the first connection part 22 and the second connection part 23, so that the interval between the first connection part 22 and the second connection part 23 can be arbitrarily changed to realize the stepless variation of the compression ratio in the section, thereby being capable of arbitrarily adjusting the compression ratio of the piston cylinder in the adjustment section. Preferably, the number of teeth of the first worm gear 2411 is greater than the number of teeth of the second worm gear 2421.

With the above structure, in order to enhance the structural strength of the adjusting mechanism 24, the first rotating member further includes a bushing 2412, the first worm wheel 2411 is sleeved on the bushing 2412, the first worm wheel 2411 and the bushing 2412 are connected by a key, the first worm wheel 2411 rotates together with the bushing 2412, the connecting hole 24121 is disposed on the bushing 2412, and the connecting hole 24121 is disposed at a distance from the first rotating shaft, so that when the first worm wheel 2411 and the bushing 2412 rotate around the first rotating shaft, the distance between the connecting hole 24121 and the bearing bush can be changed.

Further, in order to improve the structural strength of the engine connecting rod, in the present embodiment, the rod body 21 of the engine connecting rod is provided with a receiving groove 211 for installing the adjusting mechanism 24 and a through hole 212 for connecting with the bushing 2412, the through hole 212 penetrates through the groove wall of the receiving groove 211, the adjusting component 241, the driving component 243 and the shifting component 242 are all disposed in the receiving groove 211, the through hole 212 is used for connecting with the bushing 2412, the bushing 2412 penetrating through the through hole 212 can seal the notch of the receiving groove 211, not only improving the strength of the adjusting mechanism 24, but also sealing the driving component 243 and the shifting component 242 into the receiving groove 211.

Further, to be able to lock the transmission assembly 243, in the present embodiment, the adjustment mechanism 24 further comprises a locking assembly 244, the locking assembly 244 being configured to lock the transmission assembly 243. The locking assembly comprises a lock nut detachably connected to the bearing seat 2432 and a fastening thread arranged on the worm 2431 and used for being meshed with the lock nut, the external tool 3 comprises a first adjusting rod 31 used for rotating the transmission assembly 243 and a second adjusting rod 32 used for loosening the lock nut, wherein the adjusting end of the second adjusting rod 32 is provided with an inserting hole for accommodating the adjusting end of the first adjusting rod, when the external tool 3 is inserted into the cylinder 21 through a preset hole on the cylinder 21, the lock nut is loosened through the second adjusting rod 32, and then the worm 2431 is rotated through the first adjusting rod 31 so as to adjust the compression ratio of the piston cylinder. Be provided with the portion of inserting that pegs graft with first regulation pole 31 on the worm 2431, be provided with the foolproof groove of pegging graft with the portion of inserting on the first regulation pole 31, wherein the cross-section in foolproof groove is right trapezoid, be provided with the scale on the second regulation pole 32, be provided with the mark line on the first regulation pole 31, the mark line of first regulation pole 31 can rotate to different scales according to the corner of the portion of inserting that the cross-section is right trapezoid to can directly obtain the real-time position of piston through the mark line, and then can confirm the compression ratio of piston cylinder accurately, the simple operation, and adjustment efficiency has been improved.

It will be appreciated that in other embodiments, the adjustment mechanism 24 may also be a gear adjustment mechanism or a cam link adjustment mechanism. In the gear adjusting mechanism, the first rotating member may further include a first gear sleeved on the bushing, the bushing is rotatably connected to the rod body 21, the first gear is connected to the bushing through a key and can rotate together with the bushing around the first rotation shaft, the connecting hole for connecting with the piston pin is disposed on the bushing, the axis of the connecting hole is spaced from the first rotation shaft, the transmission assembly 243 may further include a second gear, the displacement assembly 242 may further include a third gear, the second gear is rotatably fixed at a preset position, and the first gear, the third gear and the second gear are sequentially meshed, so that the compression ratio of the piston cylinder can be adjusted when the external tool 3 actuates the second gear; in the cam link adjusting mechanism, the eccentric assembly includes a first rotating member, the driving assembly 243 includes a second rotating member, the displacement assembly 242 includes a link rod, the first rotating member is rotatable about a first rotation axis, the first connecting portion 22 includes a connecting hole 24121 provided on the first rotating member, an axis of the connecting hole 24121 is parallel to the first rotation axis, the second rotating member is rotatably fixed at a predetermined position, one end of the link rod is eccentrically hinged to the first rotating member, and the other end of the link rod is eccentrically hinged to the second rotating member, thereby adjusting a compression ratio of the piston cylinder when the external tool 3 actuates the second rotating member, which is not particularly limited herein.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. An engine connecting rod comprising a first connecting part (22) for connecting with a piston (13), a second connecting part (23) for connecting with a crankshaft (14) and an adjusting mechanism (24), characterized in that the adjusting mechanism (24) comprises:

-an adjustment assembly (241), the first connection portion (22) or the second connection portion (23) being connected to the adjustment assembly (241), the adjustment assembly (241) being configured to adjust a spacing between the first connection portion (22) and the second connection portion (23);

-a transmission assembly (243) drivingly connected to said adjustment assembly (241), an external tool (3) being able to actuate said transmission assembly (243) so that said adjustment assembly (241) adjusts the spacing between said first connection portion (22) and said second connection portion (23); a kind of electronic device with high-pressure air-conditioning system

-a displacement assembly (242), the adjustment assembly (241) being connected to the transmission assembly (243) by the displacement assembly (242), the displacement assembly (242) being configured to displace the transmission assembly (243) to a preset position selected as a position suitable for the external tool (3) to extend into the cylinder (11) of the engine;

the adjusting component (241) is an eccentric component, the eccentric component comprises a first rotating piece, the first rotating piece is connected with the transmission component (243) in a transmission way and can rotate around a first rotating shaft, the first connecting part (22) comprises a connecting hole (24121) arranged on the first rotating piece, and the axis of the connecting hole (24121) is arranged at intervals with the first rotating shaft;

the first rotating member comprises a first worm wheel (2411), the transmission assembly (243) comprises a worm (2431), the displacement assembly (242) comprises a second worm wheel (2421), the worm (2431) is rotatably fixed at the preset position, and the second worm wheel (2421) is in transmission connection with the first worm wheel (2411);

the adjustment mechanism (24) further comprises a locking assembly (244), the locking assembly (244) being configured to lock the transmission assembly (243);

the locking assembly (244) comprises a locking nut which is detachably connected to the bearing seat (2432) and a fastening thread which is arranged on the worm (2431) and is used for being meshed with the locking nut, the external tool (3) comprises a first adjusting rod (31) used for rotating the transmission assembly (243) and a second adjusting rod (32) used for loosening the locking nut, an adjusting end of the second adjusting rod (32) is provided with an inserting hole for accommodating the adjusting end of the first adjusting rod, an inserting part which is inserted with the first adjusting rod is arranged on the worm (2431), a fool-proof groove which is inserted with the inserting part is arranged on the first adjusting rod (31), the section of the fool-proof groove is in a right trapezoid shape, scales are arranged on the second adjusting rod (32), marking lines are arranged on the first adjusting rod (31), and the marking lines of the first adjusting rod (31) can rotate to different scales according to the rotating angle of the inserting part of which the section is in the right trapezoid shape.

2. The engine connecting rod of claim 1, wherein the number of teeth of the first worm gear (2411) is greater than the number of teeth of the second worm gear (2421).

3. The engine connecting rod of claim 1, wherein the first rotating member further comprises a bushing (2412), the first worm wheel (2411) is sleeved on the bushing (2412) and rotates together with the bushing (2412), and the connection hole (24121) is provided on the bushing (2412).

4. An engine connecting rod according to claim 3, characterized in that the rod body (21) of the engine connecting rod is provided with a receiving groove (211) for mounting the adjusting mechanism (24) and a through hole (212) for connecting with the bushing (2412), the through hole (212) penetrating the groove wall of the receiving groove (211).

5. An engine comprising a piston (13), a crankshaft (14) and an engine connecting rod according to any one of claims 1-4.