Camshaft structure of high-power brake engine

Abstract

The utility model discloses a cam shaft structure of a high-power braking engine. The cam shaft structure is used for achieving high-power braking of the engine. The cam shaft structure of the high-power brake engine comprises a cam shaft and a plurality of cam sets, the cam sets are arranged on the cam shaft, and the intervals between the adjacent cam sets are the same; the cam set comprises an air inlet cam, an exhaust cam and an HPD cam, and the exhaust cam is arranged between the air inlet cam and the HPD cam. The rear end of the camshaft is provided with a driving gear and a pulse disc.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a camshaft structure of a high-power brake engine. Background Art

[0002] According to the technical category, engine auxiliary braking can be divided into four main forms: exhaust braking, deflation braking, in-cylinder braking, and high-power braking. High-power braking is a special kind of in-cylinder braking. It breaks through the limitation of braking once in the four strokes (intake stroke, compression release stroke, power stroke, and exhaust stroke) of the existing diesel engine, and achieves two brakings in four strokes, thereby generating higher braking power. However, the existing standard engine camshaft has a combination structure of 6 intake cams and 6 exhaust cams, which can only achieve ordinary compression release braking, and it is difficult to meet the requirements of high-power engine braking. Utility Model Content

[0003] The present application provides a camshaft structure of a high-power brake engine, comprising: a camshaft and a cam group, wherein a plurality of cam groups are arranged on the camshaft, and the intervals between adjacent cam groups are the same; the cam group comprises an intake cam, an exhaust cam and an HPD cam, and the exhaust cam is arranged between the intake cam and the HPD cam; a driving gear and a pulse disk are installed at the rear end of the camshaft.

[0004] Optionally, the intake cam is a disc cam, and the cross-section of the intake cam is based on a circle and is convex in one direction.

[0005] Optionally, the exhaust cam is a disc cam, and the cross-section of the exhaust cam is based on a circle and is convex in one direction.

[0006] Optionally, the HPD cam is a disc-shaped cam, and the cross-section of the HPD cam is a shape based on a circle with three convex ends.

[0007] Optionally, the three protrusions are respectively a first protruding end, a second protruding end and a third protruding end, the center line of the first protruding end and the center line of the third protruding end both pass through the center of the circle and are arranged on the same straight line, and the second protruding end is arranged between the first protruding end and the third protruding end.

[0008] Optionally, the second protruding end is flatter than the first protruding end and the third protruding end.

[0009] Optionally, the intake cam and the exhaust cam are also contact-connected with an intake rocker arm and an exhaust rocker arm, respectively.

[0010] Optionally, the HPD cam is also contact-connected with the brake rocker arm.

[0011] Optionally, a control valve and a driving piston are provided on the brake rocker arm.

[0012] It can be seen from the above technical solutions that this application has the following advantages:

[0013] The camshaft structure of the high-power braking engine of the present application is provided with multiple cam groups on the camshaft, and the intervals between adjacent cam groups are the same; the cam group includes an intake cam, an exhaust cam and an HPD cam, and the exhaust cam is arranged between the intake cam and the HPD cam; the rear end of the camshaft is equipped with a driving gear and a pulse disk. In summary, based on the compression-release braking principle, an HPD cam is added to the original cam group, and the exhaust valve movement can be collapsed through the braking of the HPD cam, realizing two compression releases, thereby obtaining a very high braking power density and realizing high-power braking of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of an embodiment of a camshaft structure of a high-power brake engine provided in the present application;

[0015] Figure 2 A schematic structural diagram of a cross section of an intake cam provided in the present application;

[0016] Figure 3 This is a schematic diagram of the cross-section structure of the HPD cam provided in this application. DETAILED DESCRIPTION

[0017] In order to solve the above technical problems, the present application provides a camshaft structure of a high-power braking engine, which is used to achieve high-power braking of the engine.

[0018] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0019] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0020] It should also be noted that the terms "first", "second", etc. in the specification and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order, sequence or importance.

[0021] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0023] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] See also Figure 1 The present application provides an embodiment of a camshaft structure of a high-power brake engine, the embodiment comprising:

[0025] Camshaft 01 and cam group 02, multiple cam groups 02 are arranged on the camshaft 01, and the intervals between adjacent cam groups 02 are the same; the cam group 02 includes an intake cam 021, an exhaust cam 022 and an HPD cam 023, and the exhaust cam 022 is arranged between the intake cam 021 and the HPD cam 023; the rear end of the camshaft 01 is equipped with a driving gear 03 and a pulse disk 04.

[0026] First, the various components in this embodiment are introduced below:

[0027] Camshaft 01: The main body of camshaft 01 is a cylindrical rod with a length approximately the same as that of the cylinder group. A plurality of cams are mounted on it to drive the rocker arm to open and close the valve. Six cam groups 02 are arranged on the camshaft 01 of the high-power brake engine of the present application.

[0028] Cam set 02: Cam set 02 includes a plurality of regular or irregular cams with protruding ends. When the cams are working, the mechanism in contact with the cams can perform reciprocating motion or up and down or swing motion according to a set rule and route. A cam set 02 of the present application includes an intake cam 021, an exhaust cam 022 and an HPD cam 023, which are arranged in the above order.

[0029] Intake cam 021: The intake cam 021 is a cam mechanism that controls the opening and closing of the intake valve. It is installed on the camshaft 01 and rotates with the rotation of the camshaft 01. Then the structure on the intake cam 021 transmits the rotational power to the intake valve. In order to meet the combustion requirements of the engine, the intake cam 021 controls the opening and closing time of the intake valve, thereby controlling the amount of air entering.

[0030] Exhaust cam 022: Exhaust cam 022 is a cam mechanism that controls the opening and closing of the exhaust valve. It is installed on the camshaft 01 similar to the intake cam 021 and cooperates with the intake cam 021. The exhaust cam 022 controls the opening and closing time of the exhaust valve to achieve the best match between the exhaust system and the engine.

[0031] HPD cam 023: In order to achieve high-power braking on the existing ordinary compression braking engine, the present application sets an HPD cam 023 on the camshaft 01. The HPD cam 023 drives the newly added brake rocker arm on the engine to reciprocate, thereby collapsing the exhaust lift in the original engine working cycle and adding an additional compression release brake, thereby achieving high-power braking.

[0032] Driving gear 03: connected to the transmission system to drive the camshaft 01 to rotate. Driving gear 03 has a timing mark.

[0033] Pulse disc 04: In order to ensure that the time and state of valve movement are consistent with the time and state of cam movement, the pulse disc 04 is needed to control the driving gear 03, and then control the time and speed of camshaft 01 rotation. The pulse disc 04 can be integrated with the driving gear 03. There are signal teeth on the pulse disc 04. The signal teeth cooperate with the timing mark of the driving gear 03 to ensure that the camshaft 01 rotates to the correct angular position.

[0034] The camshaft 01 structure of the high-power brake engine is based on the compression-release brake principle. The engine of the present application is a six-cylinder engine, corresponding to 6 cam groups 02, and also includes 6 collapsible valve bridges. After the engine oil enters the brake oil channel and brake rocker arm corresponding to the HPD cam 023, the HPD cam 023 drives the brake rocker arm to reciprocate, and then sends the engine oil into the collapsible valve bridge, so that the exhaust lift cannot be transmitted to the valve, that is, the exhaust stroke is collapsed into a compression-release stroke. Together with the previous compression-release stroke in the original four-stroke working cycle, there are a total of two compression-release strokes, thereby obtaining a very high braking power density and realizing high-power braking of the engine.

[0035] In an optional embodiment, the intake cam 021 is a disc cam, and the cross-section of the intake cam 021 is based on a circle and is convex in one direction.

[0036] In an optional embodiment, the exhaust cam 022 is a disc cam, and the cross-section of the exhaust cam 022 is based on a circle and is convex in one direction.

[0037] In an optional embodiment, the intake cam 021 and the exhaust cam 022 are also contact-connected with the intake rocker arm and the exhaust rocker arm, respectively.

[0038] In the above three optional embodiments, the shapes of the intake cam 021 and the exhaust cam 022 are consistent, and are both standard cam shapes on ordinary engines: based on a circle, protruding in one direction to form an "egg shape". The position of the intake rocker arm corresponds to the intake cam 021, and the position of the exhaust rocker arm corresponds to the exhaust cam 022. In a cam group 02, the intake cam 021 and the exhaust cam 022 are sequentially installed on the camshaft 01, and the protruding parts of the intake cam 021 and the exhaust cam 022 are staggered at a certain angle, so that the intake cam 021 and the exhaust cam 022, when rotating with the camshaft 01, respectively touch the intake rocker arm and the exhaust rocker arm at different times, thereby making the intake rocker arm and the exhaust rocker arm staggered to open and close the intake valve and the exhaust valve to complete different stroke operations.

[0039] In an optional embodiment, the HPD cam 023 is a disc-shaped cam, and the cross-section of the HPD cam 023 is a shape based on a circle with three convex ends.

[0040] In an optional embodiment, the three protrusions are respectively a first protruding end 0231, a second protruding end 0232 and a third protruding end 0233, the center line of the first protruding end 0231 and the center line of the third protruding end 0233 both pass through the center of the circle and are arranged on the same straight line, and the second protruding end 0232 is arranged between the first protruding end 0231 and the third protruding end 0233.

[0041] In an optional embodiment, the HPD cam 023 is also in contact connection with the brake rocker arm.

[0042] In the above three optional embodiments, the basic circle of the cross section of the HPD cam 023 is consistent with the basic circle of the cross section of the intake cam 021. In order to enable the HPD cam 023 to correspond to the time point when the intake cam 021 and the exhaust cam 022 work, the positions of the three protrusions of the HPD cam 023 are set so that the center line of the first protruding end 0231 and the center line of the third protruding end 0233 both pass through the center of the basic circle and are set on the same straight line, and the second protruding end 0232 is set between the first protruding end 0231 and the third protruding end 0233.

[0043] When the first protruding end 0231 on the HPD cam 023 contacts the brake rocker arm, the engine operating time point is the top dead center of the compression stroke; when the second protruding end 0232 contacts the brake rocker arm, the engine operating time point is when the exhaust valve has just opened; when the third protruding end 0233 contacts the brake rocker arm, the engine operating time point is the original top dead center of the exhaust stroke.

[0044] In an optional embodiment, the second protruding end 0232 is flatter than the first protruding end 0231 and the third protruding end 0233 .

[0045] In the above optional embodiment, the second protruding end 0232 is flatter than the first protruding end 0231 and the third protruding end 0233, so that the contact area between the second protruding end 0232 and the brake rocker arm is larger than the contact area between the first protruding end 0231 and the third protruding end 0233 and the brake rocker arm. The second protruding end 0232 compresses the brake rocker arm for a long time, thereby causing the exhaust stroke to be collapsed when the second protruding end 0232 compresses the brake rocker arm, and becomes a compression release stroke.

[0046] In an optional embodiment, a control valve and a drive piston are provided on the brake rocker arm.

[0047] In the above optional embodiment, a control valve and a driving piston are integrated on the brake rocker arm. The control valve is used to cut off the oil flow in one direction, and the driving piston is used to squeeze the oil. When the brake rocker arm reciprocates, the oil is sent to the collapsible valve bridge, and the driving piston squeezes the oil to complete the collapse. The control valve cuts off the oil and seals the squeezed oil in the high-pressure oil chamber of the valve bridge to prevent oil leakage.

[0048] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A camshaft structure for a high-power brake engine, characterized in that: include: A camshaft and a cam group, wherein a plurality of cam groups are arranged on the camshaft, and the intervals between adjacent cam groups are the same; the cam group comprises an intake cam, an exhaust cam and an HPD cam, and the exhaust cam is arranged between the intake cam and the HPD cam; a driving gear and a pulse disk are installed at the rear end of the camshaft.

2. The camshaft structure according to claim 1, characterized in that: The intake cam is a disc cam, and the cross section of the intake cam is based on a circle and is convex in one direction.

3. The camshaft structure according to claim 1, characterized in that: The exhaust cam is a disc cam, and the cross section of the exhaust cam is based on a circle and is convex in one direction.

4. The camshaft structure according to claim 1, characterized in that: The HPD cam is a disc-shaped cam, and the cross section of the HPD cam is a shape based on a circle with three convex ends.

5. The camshaft structure according to claim 4, characterized in that: The three protrusions are respectively a first protruding end, a second protruding end and a third protruding end. The center lines of the first protruding end and the third protruding end both pass through the center of the circle and are arranged on the same straight line. The second protruding end is arranged between the first protruding end and the third protruding end.

6. The camshaft structure according to claim 5, characterized in that: The second protruding end is flatter than the first protruding end and the third protruding end.

7. The camshaft structure according to claim 1, characterized in that: The intake cam and the exhaust cam are also contact-connected with an intake rocker arm and an exhaust rocker arm respectively.

8. The camshaft structure according to claim 7, characterized in that: The HPD cam is also in contact connection with the brake rocker arm.

9. The camshaft structure according to claim 8, characterized in that: The brake rocker arm is provided with a control valve and a driving piston.

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