CN210290466U

CN210290466U - Crank throw rocker arm assembly for changing effective crank throw radius of crankshaft

Info

Publication number: CN210290466U
Application number: CN201920898927.XU
Authority: CN
Inventors: 张素英
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-10
Anticipated expiration: 2029-06-19

Abstract

A crank throw rocker arm assembly for changing the effective crank throw radius of a crankshaft is arranged on a crank throw shaft neck of the crankshaft and is provided with a connecting rod shaft neck which is eccentric relative to an inner hole; the axial end part of an inner hole of the crank rocker arm component is provided with a rocker arm, and the end part of the rocker arm is provided with a pin hole parallel to the axis of the inner hole; an annular groove is further designed in the axial middle of an inner hole of the crank rocker arm assembly, and a radial oil hole communicated with the excircle of the connecting rod journal is designed at the bottom of the annular groove; when the rocker arm of the bell crank rocker arm component is driven to rotate around the bell crank journal, the distance from the eccentric connecting rod journal of the bell crank rocker arm component to the center of the crankshaft rotating shaft is changed, namely the effective bell crank radius of the crankshaft is changed.

Description

Crank throw rocker arm assembly for changing effective crank throw radius of crankshaft

Technical Field

The present invention relates to the field of internal combustion engines, and in particular to the field of variable compression ratio internal combustion engines.

Background

The legislation requirements of energy conservation and emission reduction are getting stricter, and various automobile companies and internal combustion engine manufacturers increase the research on the energy conservation and emission reduction technology of the internal combustion engine. The internal combustion engine with the variable compression ratio has the advantages of energy conservation and emission reduction, but most of the variable compression ratio mechanisms have larger changes to the existing internal combustion engine, the mechanisms are complex, the cost is higher, and the industrialization is difficult. Such as the variable compression ratio mechanism of MCE5, france. Therefore, the mechanism with variable compression ratio of the internal combustion engine, which is realized by modifying partial parts of the existing internal combustion engine, has the relative advantages of the mechanism with variable effective crank radius of the internal combustion engine. The effective crank radius of the internal combustion engine refers to the distance from a connecting rod journal matched with a connecting rod bearing bush on a crankshaft assembly to the rotation center of the crankshaft.

Disclosure of Invention

The invention provides a crank throw rocker arm component for changing the effective crank throw radius of a crankshaft, which is arranged on a crank throw journal of the crankshaft, and is provided with a connecting rod journal which is eccentric relative to an inner hole; the axial end part of an inner hole of the crank rocker arm component is provided with a rocker arm, and the end part of the rocker arm is provided with a pin hole parallel to the axis of the inner hole; an annular groove is further designed in the axial middle of an inner hole of the crank rocker arm assembly, and a radial oil hole communicated with the excircle of the connecting rod journal is designed at the bottom of the annular groove; when the rocker arm of the bell crank rocker arm component is driven to rotate around the bell crank journal, the distance from the eccentric connecting rod journal of the bell crank rocker arm component to the center of the crankshaft rotating shaft is changed, namely the effective bell crank radius of the crankshaft is changed.

Optionally, the crank rocker arm assembly is composed of two semicircular caps and is fixedly connected through a threaded connector.

Optionally, the crank rocker arm assembly is composed of two semicircular covers and is fixedly connected through welding.

Optionally, the two semicircular caps of the crank rocker arm assembly are positioned by a part of one of the positioning sleeve and the positioning pin.

Optionally, orifices at two ends of the inner hole of the crank rocker arm assembly are designed with arc transition angles.

Optionally, a rocker arm is designed at one axial end of the inner hole of the crank rocker arm assembly.

Optionally, rocker arms are respectively designed at two axial ends of an inner hole of the crank rocker arm assembly.

Further optionally, the rocker arms at the two axial ends of the crank rocker arm assembly are designed at the two axial ends of one of the semicircular covers.

Optionally, the ring groove of the crank rocker arm assembly has an eccentric amount relative to the inner hole.

When the crank rocker arm component is used for a mechanism of the internal combustion engine with a variable effective crank radius, if the internal combustion engine is a single cylinder, the crank rocker arm component is arranged on a single-crank crankshaft of the internal combustion engine, and only one end of the crank rocker arm component is provided with a rocker arm; if the internal combustion engine is a multi-cylinder engine, each crank throw of a multi-throw crankshaft of the internal combustion engine needs to be provided with the crank throw rocker arm assembly, and rocker arms are respectively designed at two axial ends of an inner hole of the crank throw rocker arm assembly. When the internal combustion engine needs to change the effective crank throw radius of the crankshaft, the internal combustion engine controller drives the rocker arm of the crank throw rocker arm assembly on the crank throw journal to rotate around the crank throw journal through other mechanisms, so that the distance from the eccentric connecting rod journal of the crank throw rocker arm assembly to the center of the crankshaft rotating shaft is changed, namely the effective crank throw radius of the crankshaft is changed.

Drawings

FIG. 1 is a schematic view of a bell crank rocker arm assembly for use in a four cylinder machine variable effective bell crank radius mechanism;

FIG. 2 is a block diagram of the bell crank rocker arm assembly junction;

FIG. 3 is a schematic diagram of the bell crank rocker arm assembly described varying the effective bell crank radius;

Detailed Description

In order to make the objects, features and effects of the present invention more comprehensible, embodiments of the present invention are described in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as specifically described and thus is not limited by the specific embodiments disclosed below.

FIG. 1 is a schematic diagram of a bell crank rocker arm assembly for use in a four cylinder variable effective bell crank radius mechanism. The mechanism comprises a crankshaft 1, a crank rocker arm component 2 and other parts. The crank rocker arm assembly 2 is mounted to all four throws of the crankshaft 1.

FIG. 2 is a block diagram of the bell crank rocker arm assembly as described. The crank rocker arm component 2 is composed of an upper semicircular cover 2-1 and a lower semicircular cover 2-2 and is fixedly connected through a threaded connecting piece 2-3. The crank rocker arm component 2 is provided with a connecting rod journal 2a which is eccentric relative to the inner hole 2 b; the axis 2a1 of the connecting rod journal 2a is eccentric by an amount δ relative to the axis 2b1 of the bore 2 b.

With continuing reference to fig. 2, the orifices at both ends of the inner bore of the crank rocker arm assembly are designed with arc transition angles 2 g.

Continuing with fig. 2, the two axial ends of the inner bore of the crank rocker arm assembly are respectively provided with a rocker arm 2d, and the end of the rocker arm 2d is provided with a pin hole 2e parallel to the axis of the inner bore 2 b.

With continued reference to fig. 2, the rocker arms 2d at both axial ends of the crank rocker arm assembly 2 are designed at both axial ends of the lower semicircular cover 2-2.

Continuing with fig. 2, the inner hole 2b of the crank rocker arm assembly 2 is further designed with a ring groove 2c in the axial middle, the bottom of the ring groove 2c is designed with a radial oil hole 2f communicating with the outer circle of the connecting rod journal 2a, and the ring groove 2c also has an eccentric amount relative to the inner hole 2 b.

The upper semicircular cover 2-1 and the lower semicircular cover 2-2 of the crank rocker arm component 2 can be fixedly connected by using a welding process instead of the threaded connecting piece 2-3, so that the upper semicircular cover 2-1 and the lower semicircular cover 2-2 are fixed, and the corresponding threaded connecting piece structure can be cancelled by the upper semicircular cover 2-1 and the lower semicircular cover 2-2;

the upper dome 2-1 and the lower dome 2-2 of the bell crank arm assembly 2 may use locating sleeves or pins to improve the accuracy of the positioning.

The crank rocker arm component 2 can also be designed into a whole part without adopting a structure formed by combining an upper semicircular cover and a lower semicircular cover. In order to sleeve the crank throw rocker arm component 2 on the crank throw of the crankshaft, the crankshaft is designed into a combined assembly type structure.

FIG. 3 is a schematic diagram of the described bell crank rocker arm assembly 2 varying the effective bell crank radius. When the rocker arm 2d of the crank arm assembly 2 is driven by other mechanism parts on the crankshaft 1 to rotate around the crank (shown as a rocker arm and a push rod which are arranged at the center of the crankshaft), the distance from the axis 2a1 of the connecting rod journal 2a of the crank arm assembly 2 to the center of the rotating shaft of the crankshaft is changed, namely the effective crank radius of all the crankshaft cranks is changed, and the effective crank radius of the crankshaft cranks shown has a difference of delta h in height.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto, and those skilled in the art can make possible variations and modifications of the present invention using the above-described methods and techniques without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protection scope of the present invention, unless the contents of the technical solution of the present invention.

Claims

1. A crank throw rocker arm component for changing the effective crank throw radius of a crankshaft is characterized in that the crank throw rocker arm component is arranged on a crank throw journal of the crankshaft, and the crank throw rocker arm component is provided with a connecting rod journal which is eccentric relative to an inner hole; the crank rocker arm component is characterized in that a rocker arm is designed at the axial end part of an inner hole, and a pin hole parallel to the axis of the inner hole is designed at the end part of the rocker arm; an annular groove is further designed in the axial middle of an inner hole of the crank rocker arm assembly, and a radial oil hole communicated with the outer circle of the connecting rod journal is designed at the bottom of the annular groove; when the rocker arm of the crank rocker arm component is driven to rotate around the crank journal, the distance from the eccentric connecting rod journal of the crank rocker arm component to the center of the crankshaft rotating shaft is changed, namely the effective crank radius of the crankshaft is changed.

2. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 1 wherein the bell crank rocker arm assembly is comprised of two half caps and is fixedly attached by a threaded connection.

3. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 1 wherein the bell crank rocker arm assembly is comprised of two half domes and is fixedly attached by welding.

4. The assembly of claim 2 or 3, wherein the two half-domes are located by a feature of one of a locating bushing and a locating pin.

5. The crank throw rocker arm assembly that changes the effective crank throw radius of the crankshaft of claim 1 wherein the bore end orifices are designed with rounded transition angles.

6. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 1 wherein the bore is designed with a rocker arm at one axial end.

7. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 1 wherein the bore is designed with rocker arms at each axial end.

8. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 7 wherein the rocker arms at both axial ends are designed at both axial ends of either dome.

9. The bell crank rocker arm assembly for varying the effective bell crank radius of a crankshaft of claim 1 wherein the ring groove is also eccentric with respect to the bore.

10. An internal combustion engine employing the crank arm assembly of any one of claims 1 to 8 for varying the effective crank radius of the crankshaft.

11. An automobile using the bell crank rocker arm assembly of any one of claims 1 to 8 for varying the effective bell crank radius of the crankshaft.