CN209539808U - 18 cylinder diesel crankshaft of V-type - Google Patents

Abstract

The utility model discloses a V-type 18-cylinder diesel engine crankshaft. The crankshaft of the V-type 18-cylinder diesel engine includes: a main journal, a connecting rod journal, a crank arm and a balance weight. and connecting rod journals are respectively connected to both sides of the crank arm, and the one main journal, one connecting rod journal and one crank arm form a crank throw; the ratio of the diameter of the main journal to the cylinder bore is 0.91 to 1.1; The ratio of the diameter of the connecting rod journal to the bore diameter is 0.76 to 0.8; the ratio of the thickness of the crank arm to the bore diameter is 0.21 to 0.24; the ratio of the cylinder center distance to the bore bore is 1.3 to 1.5, and the radius of the balance weight The ratio to stroke is 0.9‑1. The V-type 18-cylinder diesel engine crankshaft can effectively reduce the torsional vibration performance of the crankshaft, and improve the crankshaft strength and bearing oil film thickness, so that the diesel engine crankshaft can withstand higher explosion pressure.

Description

V-type 18-cylinder diesel engine crankshaft

technical field

The utility model relates to the field of engines, in particular to a crankshaft of a V-type 18-cylinder diesel engine.

Background technique

The current diesel engines are improving their power density and reducing their size. For this reason, each component needs to bear as much load as possible in the case of the smallest possible external dimensions. It is particularly important to strengthen the crankshaft that directly transmits the power of the diesel engine.

The existing high-power V-type 18-cylinder diesel engine (90 degrees) has poor crankshaft strength and torsional vibration performance, and cannot bear greater explosion pressure.

The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and should not be considered as an acknowledgment or in any form to imply that the information constitutes the prior art already known to those skilled in the art.

Utility model content

The purpose of this utility model is to provide a V-type 18-cylinder diesel engine crankshaft with simple and reasonable structure, which can effectively reduce the torsional vibration performance of the crankshaft, and improve the crankshaft strength and bearing oil film thickness, so that the diesel engine crankshaft can withstand higher burst pressures.

In order to achieve the above object, the utility model provides a V-shaped 18-cylinder diesel engine crankshaft, including: a main journal, a connecting rod journal, a crank arm and a balance weight, the main journal is installed on the cylinder body, and the connecting rod shaft The neck is connected to the big end hole of the connecting rod, and the main journal and the connecting rod journal are respectively connected to both sides of the crank arm, and the one main journal, one connecting rod journal and one crank arm form a crank throw; the main journal The ratio of the diameter of the crank arm to the bore diameter is 0.91 to 1.1; the ratio of the diameter of the connecting rod journal to the bore bore is 0.76 to 0.8; the ratio of the thickness of the crank arm to the bore bore is 0.21 to 0.24; The ratio is 1.3-1.5, and the ratio of the radius of the balance weight to the stroke is 0.9-1.

In a preferred embodiment, the crankshaft of the V-type 18-cylinder diesel engine has nine crank throws, and the nine crankshafts are evenly distributed along the radial direction of the crankshaft of the V-type 18-cylinder diesel engine.

In a preferred embodiment, in the clockwise direction, the included angle between the first crank and the sixth crank of the nine bell cranks is 60 degrees, and the included angle between the sixth crank and the seventh crank is 60 degrees. , the angle between the seventh turn and the second turn is 60 degrees, the angle between the second turn and the fifth turn is 60 degrees, the angle between the fifth turn and the eighth turn is 60 degrees, and the angle between the eighth turn The angle between the third crank and the fourth is 60 degrees, the angle between the third and the fourth is 60 degrees, the angle between the fourth and the ninth is 60 degrees, and the angle between the ninth and the first The angle is 60 degrees.

In a preferred embodiment, the center of the main journal is provided with an axially extending first lightening hole, the first lightening hole is cylindrical, and a reinforcing rib is arranged in the middle of the first lightening hole; A second lightening hole is opened in the connecting rod journal, and the second lightening hole runs through the left and right end surfaces of the connecting rod journal, and the second lightening hole is arc-shaped.

In a preferred embodiment, the single row firing order of the crankshaft of the V-type 18-cylinder diesel engine is as follows: the first cylinder, the fourth cylinder, the eighth cylinder, the second cylinder, the sixth cylinder, the ninth cylinder, the third cylinder, The fifth cylinder and the seventh cylinder fire evenly at 80 degrees.

Compared with the prior art, the crankshaft of the V-type 18-cylinder diesel engine according to the present invention has the following beneficial effects: the crankshaft of the V-type 18-cylinder diesel engine is equipped with a suitable ignition sequence, which can effectively reduce the torsional vibration performance of the crankshaft and improve the strength of the crankshaft And bearing oil film thickness, so that the diesel engine crankshaft can withstand higher explosion pressure, improve the reliability of engine operation.

Description of drawings

Fig. 1 is a schematic structural view of a crankshaft of a V-type 18-cylinder diesel engine according to a first embodiment of the present invention.

Fig. 2 is a partial structural schematic diagram of a crankshaft of a V-shaped 18-cylinder diesel engine according to the first embodiment of the present invention.

Fig. 3 is a schematic diagram of crank throw distribution of the crankshaft of the V-type 18-cylinder diesel engine according to the first embodiment of the present invention.

Detailed ways

The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

As shown in FIG. 1 , the crankshaft of a V-type 18-cylinder diesel engine according to a preferred embodiment of the present invention specifically includes: a main journal 11 , a connecting rod journal 12 , a crank arm 13 and a balance weight. Among them, the main journal 11 is installed on the cylinder block, the connecting rod journal 12 is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, and the main journal 11 and the connecting rod journal 12 are respectively connected with the two ends of the crank arm 13. Side connection, a main journal 11, a connecting rod journal 12 and a crank arm 13 form a crank throw. The crankshaft of the V-type 18-cylinder diesel engine has nine crankshafts. By designing the main parameters of the nine crankshafts and matching the proper ignition sequence, the torsional vibration performance of the crankshaft can be effectively reduced, and the strength of the crankshaft and the thickness of the bearing oil film can be improved. So that the diesel engine crankshaft can withstand higher explosion pressure.

Specifically, the engine crankshaft is the main rotating part of the engine. After the connecting rod is installed, it can undertake the up and down (reciprocating) motion of the connecting rod and become a circular (rotating) motion, which is an important part of the engine. The rotation of the crankshaft is the power source of the engine. It is also the source power of the entire mechanical system.

The main journal 11 is a hollow structure, that is, the center of the main journal 11 is provided with a first lightening hole extending axially. Preferably, the first lightening hole is cylindrical. A reinforcing rib is arranged in the middle of the first lightening hole.

The connecting rod journal 12 is a hollow structure, that is, there is a second weight reducing hole in the connecting rod journal, and the second weight reducing hole runs through the left and right end faces of the connecting rod journal. Preferably, the second weight reducing hole is arc.

One end of the main journal 11 and one end of the connecting rod journal 12 are respectively connected with both sides of the crank arm 13 to form a crank throw.

The balance block is used to balance the centrifugal force and moment generated by the crankshaft connecting rod journal and the crank arm, so that the crankshaft runs smoothly and reduces the load on the main journal bearing bush, so that the engine runs smoothly and reduces the main journal load. There are two types of balance weights, one is made integral with the crankshaft; the other is made separately and fixed on the crank with screws. The latter is called an assembled balance weight, and the engine generally uses an integrated balance weight.

(1) The main design parameters of crankshaft:

As shown in Figure 2, the diameter d1/D (bore diameter) of the main journal is 0.91 to 1.1, which can effectively improve the strength of the crankshaft.

The diameter d2/D (bore diameter) of the connecting rod journal is 0.76-0.8, which effectively improves the strength of the crankshaft and the stiffness of the connecting rod journal, and prevents the deformation of the journals of the two cylinders.

The thickness H/D (bore diameter) of the crank arm is 0.21 to 0.24, which effectively reduces the distance between the cylinder centers and the length of the engine.

The cylinder center distance L/D (bore diameter) is 1.3 to 1.5, effectively reducing the cylinder center distance and ensuring the compactness of the engine.

The radius P/S (stroke) of the balance weight is 0.9-1, which can effectively improve the oil film level of the bearing journal.

(2) The firing sequence corresponding to the crankshaft structure

As shown in Figure 3, the V-shaped 18-cylinder diesel engine divides all cylinders into two groups, and arranges adjacent cylinders together at a certain angle, so that the two groups of cylinders form a plane with an angle, and the cylinders are V-shaped when viewed from the side. The height and length of the V-shaped 18-cylinder diesel engine are small, and it is convenient to arrange. It facilitates increased displacement and power by enlarging the cylinder diameter and is suitable for higher cylinder counts. The V-shaped 18-cylinder diesel engine crankshaft has nine crankshafts. Seen from the front end of the crankshaft, the nine crankshafts are evenly distributed along the radial direction of the V-shaped 18-cylinder diesel engine crankshaft. In the clockwise direction, the first crankshaft 1 and the second crankshaft The included angle of the six curved turns 6 is 60 degrees, the included angle between the sixth curved turn 6 and the seventh curved turn 7 is 60 degrees, the included angle between the seventh curved turn 7 and the second curved turn 2 is 60 degrees, and the included angle between the second curved turn 2 and the The angle between the fifth crank 5 and the eighth crank 8 is 60 degrees, the angle between the eighth crank 8 and the third crank 3 is 60 degrees, and the third crank 3 It is 60 degrees with the fourth crank 4 included angle, the 4th crank 4 and the 9th crank 9 included angles are 60 degrees, and the 9th crank 9 and the first crank 1 included angles are 60 degrees.

The single-row ignition sequence of the crankshaft of the V-type 18-cylinder diesel engine is: 1-4-8-2-6-9-3-5-7, each cylinder is evenly fired at 80 degrees, and proper firing is conducive to the improvement of the torsional vibration performance of the shaft system .

In summary, the crankshaft of the V-type 18-cylinder diesel engine is equipped with a suitable ignition sequence, which can effectively reduce the torsional vibration performance of the crankshaft, and improve the strength of the crankshaft and the thickness of the oil film of the bearing, so that the crankshaft of the diesel engine can withstand higher explosion pressure and improve the reliability of the engine operation. sex.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are 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 purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various exemplary embodiments of the present invention and various Different options and changes. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (5)

1. a V-type 18-cylinder diesel engine crankshaft, is characterized in that, comprises: main journal, connecting rod journal, crank arm and balance weight, and described main journal is installed on the cylinder body, and described connecting rod journal and connecting rod The big head hole connection, the main journal and the connecting rod journal are respectively connected with the two sides of the crank arm, and the one main journal, one connecting rod journal and one crank arm form a crank throw; the diameter of the main journal and the cylinder bore The ratio of the diameter of the connecting rod journal to the bore is 0.76 to 0.8; the ratio of the thickness of the crank arm to the bore is 0.21 to 0.24; the ratio of the cylinder heart distance to the bore is 1.3 to 1.5, the ratio of the radius of the balance weight to the stroke is 0.9-1. 2. V-type 18-cylinder diesel engine crankshaft as claimed in claim 1, is characterized in that, described V-type 18-cylinder diesel engine crankshaft has nine crank throws, and these nine crankshafts are along the diameter of described V-type 18-cylinder diesel engine crankshafts. Uniform distribution. 3. The V-type 18-cylinder diesel engine crankshaft as claimed in claim 2, wherein, in the clockwise direction, the angle between the first crank and the sixth crank of the nine bell cranks is 60 degrees, and the sixth crank The included angle between the seventh curved turn and the seventh curved turn is 60 degrees, the angle between the seventh curved turn and the second curved turn is 60 degrees, the angle between the second curved turn and the fifth curved turn is 60 degrees, the fifth curved turn and the eighth The angle between the eighth and the third is 60 degrees, the angle between the third and the fourth is 60 degrees, the angle between the fourth and the ninth is 60 degrees, the angle between the ninth crank and the first crank is 60 degrees. 4. The V-type 18-cylinder diesel engine crankshaft as claimed in claim 1, wherein the center of the main journal is provided with a first lightening hole extending axially, the first lightening hole is cylindrical, and the first lightening hole is cylindrical. A reinforcing rib is provided in the middle of the first weight-reducing hole; a second weight-reducing hole is opened in the connecting rod journal, and the second weight-reducing hole runs through the left and right end surfaces of the connecting rod journal. The holes are arc-shaped. 5. V-type 18-cylinder diesel engine crankshaft as claimed in claim 1, is characterized in that, the single-row firing order of this V-type 18-cylinder diesel engine crankshaft is successively: the first cylinder, the fourth cylinder, the eighth cylinder, the second cylinder, The sixth cylinder, the ninth cylinder, the third cylinder, the fifth cylinder, and the seventh cylinder all fire at an average 80 degrees.