CN210265468U

CN210265468U - V6 crankshaft structure

Info

Publication number: CN210265468U
Application number: CN201921318237.9U
Authority: CN
Inventors: 黄第云; 唐克远; 蔚兴建
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-04-07
Anticipated expiration: 2029-08-14

Abstract

The utility model discloses a V6 crankshaft structure. The two-end crank throw of the V6 crankshaft structure comprises: a main journal; a connecting rod journal; two sides of the crank arm are respectively connected with one end of the main journal and one end of the connecting rod journal to form a crank throw; and the balance weight is arranged on crank arms of crank throws at two ends of the V6 crank structure. The V6 crankshaft structure not only balances the centrifugal force and moment generated by the crankshaft connecting rod journal and the crank arm, enables the crankshaft to run smoothly and reduces the load born by the main journal bearing bush, but also reduces the processing and assembling difficulty of the V6 crankshaft.

Description

V6 crankshaft structure

Technical Field

The utility model relates to an engine field especially relates to a V6 crankshaft structure.

Background

V6 refers to the number of cylinders and the arrangement mode of the cylinders of the engine, V6 refers to a 6-cylinder engine, and the cylinders are arranged in a V shape, so that each cylinder is coordinated with each other, noise is little, and operation is smooth. The V-engine is small in length and height dimensions and very convenient to arrange, and is generally considered to be a relatively advanced engine.

The V6 engine is usually provided with counterweights on the pulleys and flywheels, which are used to balance the centrifugal forces and moments generated by the crankshaft connecting rod journals and the crank arms, so as to smooth the crankshaft operation and reduce the load borne by the main journal bearing bushes, thereby smoothing the engine operation and reducing the main journal load. The balance weight is of two types, one type is integrated with the crankshaft; the other is made separately and fixed on the crank by a screw. However, the counterweight of the V6 engine is arranged on the belt pulley and the flywheel, and is difficult to process and assemble.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure is reasonable V6 crankshaft structure, this V6 crankshaft structure both balance the centrifugal force and the moment that crankshaft connecting rod axle journal and crank arm produced, make the load that the bent axle operates steadily and reduce the main journal axle bush and bear, have reduced the processing and the assembly difficulty of this V6 bent axle again.

In order to achieve the above object, the utility model provides a V6 crankshaft structure, this V6 crankshaft structure's both ends crank throw all includes: a main journal; a connecting rod journal; two sides of the crank arm are respectively connected with one end of the main journal and one end of the connecting rod journal to form a crank throw; and the balance weight is arranged on crank arms of crank throws at two ends of the V6 crank structure.

In a preferred embodiment, the thickness of the crank arm with the counterweight is 0.3 to 0.5 times the cylinder center distance.

In a preferred embodiment, the thickness of the crank arm without the counterweight is 0.09 to 0.15 times the cylinder center distance.

In a preferred embodiment, the radius of rotation of the counterweight is 1-1.2 times the radius of rotation of the crank arm with the counterweight.

In a preferred embodiment, the offset angle of the counterweight is 20-35 degrees.

Compared with the prior art, according to the utility model discloses a V6 bent axle construction has following beneficial effect: according to the V6 crankshaft structure, the balance weight is arranged on the crank arm at the outermost side of the crankshaft, and the balance weight is not required to be arranged on the belt pulley and the flywheel, so that the centrifugal force and the moment generated by the crankshaft connecting rod journal and the crank arm are balanced, the crankshaft runs stably, the load borne by the main journal bearing bush is reduced, and the processing and assembling difficulty of the V6 crankshaft is reduced.

Drawings

Fig. 1 is a front view structural diagram of a V6 crankshaft structure according to a first embodiment of the present invention.

Fig. 2 is a side view schematic structure diagram of a V6 crankshaft structure according to a first embodiment of the present invention.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 and 2, the two-end bell cranks of the V6 crankshaft structure according to the preferred embodiment of the present invention each include: main journals 11, connecting rod journals 12, crank arms 13, and counterweights. The main journal 11 is installed on the cylinder body, the connecting rod journal 12 is connected with the connecting rod big end hole, the connecting rod small end hole is connected with the cylinder piston, the main journal 11 and the connecting rod journal 12 are respectively connected with two sides of the crank arm 13, the V6 crank shaft structure arranges the balance weight on the crank arms of the crank throws at two ends of the crank shaft (the two crank throws at the outermost sides), the balance weight is not needed on the belt pulley and the flywheel, the centrifugal force and the moment generated by the crank shaft connecting rod journal and the crank arm are balanced, the crank shaft operates stably, the load born by the main journal bearing bush is reduced, and the processing and assembling difficulty of the V6 crank shaft is reduced.

Specifically, the crankshaft of the engine is the main rotating element of the engine, and after the connecting rod is installed, the crankshaft can receive the up-and-down (reciprocating) motion of the connecting rod and change into a circulating (rotating) motion, and the crankshaft is an important element on the engine. The rotation of the crankshaft is the power source of the engine. And is also the source power of the whole mechanical system.

The main journal 11 is a bearing portion of the crankshaft, and is supported in a main bearing housing of the crankcase by a main bearing. Crankshafts can be divided into fully supported crankshafts and non-fully supported crankshafts, depending on the number of main journals.

The connecting rod journal 12 is used for being connected with a connecting rod big end hole, a connecting rod bearing bush is arranged in the connecting rod big end hole, and the connecting rod is assembled with the connecting rod journal through the connecting rod bearing bush and is one of the most important matching pairs in the engine. The common antifriction alloys mainly include white alloys, copper-lead alloys and aluminum-based alloys.

Both sides of the crank arm 13 are connected to one end of the main journal 11 and one end of the connecting rod journal 12, respectively, to form a bell crank. The V6 crankshaft structure has a throw at each end.

An inertia ring (the mass is the mass of two connecting rod big ends + the mass of one reciprocating connecting rod small end) needs to be arranged on the connecting rod journal, and the inertia product of the inertia ring around the central line of the crankshaft is less than 400 kgcm. This is achieved by adjusting the angles of the L1 and R2, the counterweights, of the thickest crank arms (crank arms at both ends of the V6 crank structure). The balance weights are distributed on crank arms of crank throws at two ends of the crankshaft (two crank throws at the outermost sides), and are used for balancing centrifugal force and moment generated by a crankshaft connecting rod journal and the crank arms without the need of making balance weights on belt pulleys and flywheels, so that the crankshaft runs stably, the load borne by a main journal bearing bush is reduced, an engine runs stably, and the load of the main journal is reduced.

Preferably, the thickness L1 of the crank arm with the counterweight is 0.3-0.5 of the cylinder center distance L.

Preferably, the crank arm without counterweight has a thickness L2 of 0.09 to 0.15 times the cylinder center distance L.

Preferably, the counterweight has a radius of rotation R2 that is 1-1.2 times the radius of rotation R1 of the crank arm with the counterweight.

Preferably, as shown in fig. 2, the offset angle a of the counterweight is 20-35 degrees.

In conclusion, the V6 crankshaft structure arranges the balance weight on the crank arm at the outermost side of the crankshaft, and does not need to do balance weight on the belt pulley and the flywheel, thereby not only balancing the centrifugal force and moment generated by the crankshaft connecting rod journal and the crank arm, enabling the crankshaft to run stably, reducing the load born by the main journal bearing bush, but also reducing the processing and assembling difficulty of the V6 crankshaft.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A V6 crankshaft structure, characterized in that, the both ends crank throw of this V6 crankshaft structure includes:

a main journal;

a connecting rod journal;

two sides of the crank arm are respectively connected with one end of the main journal and one end of the connecting rod journal to form a crank throw; and

and the balance weights are arranged on crank arms of crank throws at two ends of the V6 crankshaft structure.

2. The V6 crankshaft structure of claim 1, wherein the crank arm with the counterweight has a thickness of 0.3-0.5 times the cylinder center distance.

3. The V6 crankshaft structure of claim 2, wherein the thickness of the crank arm without the counterweight is 0.09-0.15 times the cylinder center distance.

4. The V6 crankshaft structure of claim 3, wherein the counterweight has a radius of rotation that is 1-1.2 times the radius of rotation of the crank arm with the counterweight.

5. The V6 crankshaft structure of claim 4, wherein the offset angle of the counterweight is 20-35 degrees.