Crankshaft structure for ductile iron casting of natural gas engine
By designing an integrated crankpin and main journal on the crankshaft of a natural gas engine, and opening weight reduction holes and oil holes on them, the problem of insufficient strength caused by lightweight design is solved, achieving high strength, low cost and high efficiency in production.
Patent Information
- Application Number
- CN202422854738.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-22
AI Technical Summary
The lightweight design of existing natural gas engine crankshafts results in insufficient strength, making them prone to damage, and they also have casting defects.
The crank pin and main journal adopt an integrated structure design, and weight reduction holes and oil holes are opened on the crank pin and main journal to avoid inserting copper bushings and improve the density and mechanical properties of the casting.
It improves the mechanical properties and service life of the crankshaft, reduces weight and cost, while reducing wear and increasing production efficiency.
Smart Images
Figure CN223609110U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to engine parts technical field, specifically, the utility model relates to a kind of for natural gas engine nodular cast iron casting crank structure. BACKGROUND
[0002] Crankshaft is the main rotating machine of engine, after being equipped with connecting rod, it can accept the reciprocating motion of connecting rod, and change it into circular motion, in order to reduce its kinetic energy consumption and cost, the existing crank is designed as hollow lightweight design, which leads to insufficient strength of crank, and is more easily damaged.
[0003] In prior art, solid crankshaft is used, which is not only heavy, but also easy to produce casting defects such as porosity and loose. SUMMARY
[0004] The utility model provides a kind of for natural gas engine nodular cast iron casting crank structure to solve the problems in the above background.
[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a kind of for natural gas engine nodular cast iron casting crank structure, comprising crank pin, main shaft neck, crank pin weight reduction hole and main shaft neck weight reduction hole, the crank pin and main shaft neck are integrated structure, the crank pin weight reduction hole is opened in one side of the crank pin, the main shaft neck weight reduction hole is opened in one side of the main shaft neck;
[0006] The top of the crank pin is provided with crank pin oil hole;
[0007] The top of the main shaft neck is provided with main shaft neck oil hole.
[0008] Preferably, the crank pin oil hole avoids the crank pin weight reduction hole.
[0009] Preferably, the main shaft neck oil hole avoids the main shaft neck weight reduction hole.
[0010] The beneficial effects of the above technical scheme are as follows:
[0011] 1、The crankshaft of the utility model makes the internal organization grain of casting more refined and dense, greatly improves the mechanical properties of casting, in addition, light in weight, low in cost, the strength is in conformity with, and the wear of connection place with other parts is greatly reduced, the service life of crankshaft is increased, the production cost is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0012] Fig. 1 is the partial sectional view of the utility model;
[0013] Fig. 2 is the structure schematic view of the utility model;
[0014] Wherein:
[0015] 1, crank pin; 2, main journal; 3, crank pin weight reduction hole; 4, main journal weight reduction hole; 5, crank pin oil hole; 6, main journal oil hole. DETAILED DESCRIPTION
[0016] The specific embodiments of the present application are further described in detail below with reference to the drawings, by describing the embodiments, the purpose is to help the skilled in the art to have more complete, accurate and in-depth understanding of the concept, technical scheme of the present application, and to help its implementation.
[0017] As Figs. 1-2 shown, the present application is a kind of for natural gas engine nodular graphite castings crank structure, light weight, low cost, strength meets, and other components connection place wear greatly reduces, increase the service life of crankshaft.
[0018] Specifically, as Figs. 1-2 shown, including crank pin 1, main journal 2, crank pin weight reduction hole 3 and main journal weight reduction hole 4, crank pin 1 and main journal 2 are integrated structure, crank pin weight reduction hole 3 is set up in one side of crank pin 1, main journal weight reduction hole 4 is set up in one side of main journal 2;
[0019] Crank pin 1, main journal 2, crank pin weight reduction hole 3 and main journal weight reduction hole 4 are all several, to form crankshaft;
[0020] The top of crank pin 1 is provided with crank pin oil hole 5; the top of main journal 2 is provided with main journal oil hole 6.
[0021] Crank pin oil hole 5 avoids crank pin weight reduction hole 3, and main journal oil hole 6 avoids main journal weight reduction hole 4.
[0022] The following specific working mode is described by specific embodiments: Example 1
[0023] As Fig. 1 shown, when the recommended hollow degree is 0.55, i.e. D1 / D2=0.55, the maximum bending stress of crankshaft is minimum; the length T of weight reduction hole necking portion is (0.2~0.45)h;
[0024] The present application adopts oil channel position change, oil channel drilling formation, without embedding copper sleeve drilling, the maximum hollow degree;
[0025] Main journal hollow degree=50 / 110=0.454; Crank pin hollow degree=42 / 92=0.46; T takes 0.3
[0026] The advantages of this scheme are: no need to embed copper sleeve, avoid the problem of bushing caused by sleeve falling off.
[0027] Fig. 2 The crank pin oil hole 5 and the main shaft neck oil hole 6 avoid the crank pin weight reduction hole 3.
[0028] The above has carried out the exemplary description to the utility model in combination with the drawings, obviously, the utility model concrete implementation is not limited by the above-mentioned mode, as long as the method conception and technical scheme of the utility model are used to carry out various non-essential improvements; or without improvement, the above-mentioned conception and technical scheme of the utility model are directly applied to other occasions, all are within the protection scope of the utility model.
Claims
1. A nodular iron crankshaft structure for a natural gas engine cast, characterized by: Including crank pin (1), main shaft neck (2), crank pin weight reduction hole (3) and main shaft neck weight reduction hole (4), the crank pin (1) is the integral structure with main shaft neck (2), the crank pin weight reduction hole (3) is set up in one side of the crank pin (1), the main shaft neck weight reduction hole (4) is set up in one side of the main shaft neck (2); The top of the crank pin (1) is provided with a crank pin oil hole (5). The top of the main shaft neck (2) is provided with a main shaft neck oil hole (6).
2. A nodular iron crankshaft structure for a natural gas engine cast component according to claim 1, characterized in that: The crank pin oil hole (5) avoids the crank pin weight reduction hole (3).
3. A cast-iron crankshaft structure for a natural gas engine cast component according to claim 1, characterized in that: The main shaft neck oil hole (6) avoids the main shaft neck weight reduction hole (4).