Rocker arm for engine brake

Abstract

The rocker arm for the engine brake comprises a rocker arm body, a cam connecting portion and a valve assembly connecting portion, and the rocker arm body is provided with a first shaft hole penetrating through the left side face and the right side face of the rocker arm body and used for installing a rocker arm shaft and a second shaft hole penetrating through the left side face and the right side face of the rocker arm body and used for an oil way control valve. A main oil duct is arranged between the second shaft hole and the first shaft hole, a connecting port of the main oil duct and the first shaft hole is a first port, and a connecting port of the main oil duct and the second shaft hole is a second port. And the height of the second port relative to the horizontal plane is always higher than that of the first port relative to the horizontal plane, so that oil can flow smoothly. And the second port of the main oil duct is arranged above the first port, and the main oil duct and the first shaft hole are obliquely arranged, so that the rocker arm is ensured to be smoothly filled with oil, and the condition of scrap iron is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of automobile accessories, and in particular relates to a rocker arm for an engine brake. Background Art

[0002] The brake rocker arm plays a vital role in the vehicle's braking system. It converts the braking force in the brake drum into braking torque, thereby slowing down or stopping the vehicle. During driving, the brake rocker arm also helps maintain vehicle stability and prevents excessive brake wear, thereby extending the service life of the brake. If the rocker arm fails, it will pose a great threat to driving safety. Figure 1 As shown, due to the problem of the processing method, an irregular and offset flyhole is formed between the existing rocker arm main oil channel and the rocker arm shaft mounting hole, and the main oil channel supplies oil in an oblique upward manner, which will cause the problem of iron chips not being able to be discharged. This problem of iron chips not being able to be discharged will further lead to problems such as rocker arm wear and loose rocker arm connection, affecting the braking function. Summary of the Invention

[0003] The utility model aims to provide a rocker arm for an engine brake, which ensures smooth oil flow through the rocker arm and prevents the presence of iron filings.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a rocker arm for an engine brake, which includes a rocker arm body, a cam connecting part is provided at the front end of the rocker arm body, and a valve assembly connecting part is provided at the rear end of the rocker arm body. The rocker arm body is provided with a first axial hole that passes through its left and right side surfaces and is used to install the rocker arm shaft, and a second axial hole that passes through its left and right side surfaces and is used for the oil circuit control valve. A main oil channel is provided between the second axial hole and the first axial hole. The connection between the main oil channel and the first axial hole is a first port, and the connection between the main oil channel and the second axial hole is a second port. When the cam connecting part of the rocker arm is at the highest point or at the lowest point or in the switching process from the highest point to the lowest point, the height of the second port relative to the horizontal plane is always higher than the height of the first port relative to the horizontal plane, which can ensure smooth oil flow.

[0005] In another embodiment, the second shaft hole is provided on a side of the rocker arm body close to the valve assembly connection portion and is located obliquely above the first shaft hole.

[0006] In another embodiment, the axes of the second shaft hole and the first shaft hole are parallel, and the angle between the axis of the main oil channel and the second shaft hole is 20° to 80°, which can ensure smooth oil flow and carry away iron chips to prevent their accumulation.

[0007] In another embodiment, the angle formed between the axis of the main oil channel and the second shaft hole is 40° to 50°.

[0008] In another embodiment, an oil storage chamber is provided on the inner side wall of the first axial hole, which is coaxial with the main oil channel and extends from the inner side wall of the first axial hole toward the main oil channel. The junction of the oil storage chamber and the main oil channel is an annular end face, and the annular end face is perpendicular to the axis of the main oil channel, which can further make the oil flow smooth and can smoothly carry away iron chips to prevent iron chips from accumulating.

[0009] In another embodiment, a third axial hole whose axis is perpendicular to the first axial hole is formed on the connecting portion of the valve assembly, and the piston of the valve assembly is installed in the third axial hole, making the structure more compact.

[0010] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art: the utility model sets the second port of the main oil channel above the first port and makes the main oil channel and the first shaft hole inclined, ensuring smooth oil flow to the rocker arm and no iron filings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of a rocker arm in the prior art;

[0012] Figure 2 This is a schematic structural diagram of the rocker arm of the present invention;

[0013] Figure 3 It is a cross-sectional view of the rocker arm of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0015] See attached Figure 2-3 As shown, the rocker arm for the engine brake includes a rocker arm body 1, a cam connecting portion 2 is provided at the front end of the rocker arm body 1, a valve assembly connecting portion 3 is provided at the rear end of the rocker arm body 1, a first axial hole 4 that passes through the left and right sides of the rocker arm body 1 and is used to install the rocker arm shaft, and a second axial hole 5 that passes through the left and right sides of the rocker arm body 1 and is used for the oil circuit control valve, a main oil channel 7 is provided between the second axial hole 5 and the first axial hole 4, the connection between the main oil channel 7 and the first axial hole 4 is a first port 8, and the connection between the main oil channel 7 and the second axial hole 5 is a second port 9. When the cam connecting portion 2 of the rocker arm is at the highest point or at the lowest point or in the switching process from the highest point to the lowest point, the height of the second port 9 relative to the horizontal plane is always higher than the height of the first port 8 relative to the horizontal plane.

[0016] The second axial hole 5 is located on the side of the rocker arm body 1 near the valve assembly connection portion 3 and is located obliquely above the first axial hole 4. The axes of the second axial hole 5 and the first axial hole 4 are parallel, and the axis of the main oil gallery 7 forms an angle of 20° to 80° with the second axial hole 5. The axes of the second axial hole 5 and the first axial hole 4 are parallel. Preferably, the angle between the axis of the main oil gallery 7 and the second axial hole 5 is 40° to 50°, and can be 42°, 45°, or 48°.

[0017] An oil storage chamber 0 is provided on the inner side wall of the first shaft hole 4, which is coaxial with the main oil channel 7 and extends from the inner side wall of the first shaft hole 4 toward the main oil channel 7. The junction between the oil storage chamber 0 and the main oil channel 7 is an annular end face, which is perpendicular to the axis of the main oil channel 7. The oil storage chamber is more regular, which is convenient for the discharge of iron chips.

[0018] A third axial hole 6 with an axis perpendicular to the first axial hole 4 is formed on the valve assembly connecting portion 3. The piston of the valve assembly is installed in the third axial hole 6. The piston is a prior art and will not be described in detail here.

[0019] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A rocker arm for an engine brake, comprising a rocker arm body, a cam connection portion provided at a front end of the rocker arm body, a valve assembly connection portion provided at a rear end of the rocker arm body, a first axial hole penetrating through left and right side surfaces of the rocker arm body for mounting a rocker arm shaft, and a second axial hole penetrating through left and right side surfaces of the rocker arm body for an oil circuit control valve, a main oil passage being provided between the second axial hole and the first axial hole, a connection between the main oil passage and the first axial hole being a first port, and a connection between the main oil passage and the second axial hole being a second port, characterized in that: When the cam connection portion of the rocker arm is at the highest point or the lowest point or in a switching process from the highest point to the lowest point, the height of the second port relative to the horizontal plane is always higher than the height of the first port relative to the horizontal plane.

2. The rocker arm for an engine brake according to claim 1, wherein: The second shaft hole is provided on a side of the rocker arm body close to the valve assembly connection portion and is located obliquely above the first shaft hole.

3. The rocker arm for an engine brake according to claim 1, wherein: The axes of the second shaft hole and the first shaft hole are parallel, and the angle formed between the axis of the main oil passage and the second shaft hole is 20° to 80°.

4. The rocker arm for an engine brake according to claim 3, wherein: The included angle between the axis of the main oil channel and the second shaft hole is 40° to 50°.

5. The rocker arm for an engine brake according to claim 1, wherein: An oil storage chamber is provided on the inner side wall of the first axial hole, which is coaxial with the main oil channel and extends from the inner side wall of the first axial hole toward the main oil channel. The junction of the oil storage chamber and the main oil channel forms an annular end surface, and the annular end surface is perpendicular to the axis of the main oil channel.

6. The rocker arm for an engine brake according to claim 1, wherein: The valve assembly connecting portion is provided with a third axial hole whose axis is perpendicular to the first axial hole.

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