A vibration-damping valve bridge

Abstract

An embodiment of the present application discloses a shock-absorbing valve bridge, which is used to reduce the impact of collision on the valve chain system, thereby reducing the incidence of valve chain failures caused by collision shock. The present application includes: a valve bridge body, a spring cap, and a spring structure; a deep hole is provided on the valve bridge body, and the deep hole is located at the center of the position where the rocker arm head presses the valve bridge body; one side of the spring structure is fixedly connected to the bottom of the deep hole, and the other side is fixedly connected to the spring cap; the spring cap is accommodated in the deep hole; when the valve bridge body is subjected to collision shock, the spring structure is used to apply a reverse force to the spring cap to attenuate the collision impact force received by the spring cap.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of engines, and in particular, to a vibration-damping valve bridge. Background Art

[0002] With the development of technology, the rotational speed of automobile engines has become higher and higher. The traditional two-valve system is no longer able to complete the gas exchange work within such a short time, which limits the improvement of engine performance. It was not until the subsequent popularization of the multi-valve technology that the overall quality of the engine achieved a qualitative leap.

[0003] Currently, most multi-valve engines in automobiles are four-valve type, and two overhead camshafts are used to control the valves arranged on both sides of the combustion center line of the cylinder. The valves are arranged at an inclined position on both sides of the center of the cylinder combustion chamber, which can maximize the diameter of the valve head, increase the gas flow area, and form a compact combustion chamber with a spark plug located in the center.

[0004] When the vehicle is driving on the road, if the whole vehicle collides with an uneven road surface, the push rod, tappet, valve bridge and other freely movable parts will collide with fixed parts such as rocker arms. The instantaneous high-speed collision will generate stress and deformation, and propagate in the parts in the form of waves, which easily damages the valve chain parts such as valves and rocker arm bolts, resulting in failures in the valve chain system. Summary of the Invention

[0005] The embodiments of the present application provide a vibration-damping valve bridge, which is used to reduce the impact of collision on the valve chain system, thereby reducing the incidence of valve chain failures caused by collision impact.

[0006] The present application provides a vibration-damping valve bridge, including:

[0007] A valve bridge body, a spring cap and a spring structure;

[0008] A deep hole is provided on the valve bridge body, and the deep hole is located at the center of the position where the rocker arm head presses the valve bridge body;

[0009] One side of the spring structure is fixedly connected to the bottom of the deep hole, and the other side is fixedly connected to the spring cap;

[0010] The spring cap is accommodated in the deep hole;

[0011] When the valve bridge body is subjected to a collision impact, the spring structure is used to apply a reverse force to the spring cap to attenuate the collision impact force received by the spring cap.

[0012] Optionally, the bottom surface of the deep hole is an inner concave spherical surface, and the inner concave spherical surface is used to buffer the spring structure when the spring structure deforms under the impact force.

[0013] Optionally, a buffer rubber is provided on the inner wall of the deep hole, and the buffer rubber is used to reduce the acting force generated between the spring cap and the inner surface of the deep hole.

[0014] Optionally, the bottom area of the deep hole is smaller than the area at the pressing position.

[0015] Optionally, the spring cap is of a hard cap type structure.

[0016] Optionally, the spring cap and the spring structure are detachably connected.

[0017] Optionally, the spring structure includes at least two springs for increasing the buffering force against collision.

[0018] Optionally, the elastic strengths between the springs in the spring structure are different.

[0019] Optionally, the outer surface of the spring cap is wrapped with a rubber coating, and the rubber coating is used to slow down the impact force received by the spring cap.

[0020] Optionally, a rubber impact reduction block is embedded at the top of the spring cap, and the rubber impact reduction block is used to increase the friction between the spring cap and the rocker arm head.

[0021] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0022] In the present application, a valve bridge including a valve bridge body, a spring cap and a spring structure is provided. A deep hole is provided on the valve bridge body to accommodate the spring cap and the spring structure. When the valve bridge body is subjected to a collision impact, the spring structure can apply a reverse acting force to the spring cap to attenuate the collision impact force received by the spring cap, so as to reduce the impact of the collision on the valve train system and reduce the incidence of valve train failures caused by the collision impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the shock-absorbing valve bridge in the embodiment of the present application. DETAILED DESCRIPTION

[0024] A four-valve engine is controlled by two overhead camshafts to control the valves arranged on both sides of the cylinder combustion center line. The valves are arranged at inclined positions on both sides of the center of the cylinder combustion chamber, which can maximize the diameter of the valve head, increase the airflow passage area, and form a compact combustion chamber with a spark plug located in the center.

[0025] Today's heavy-duty four-valve diesel engines mostly use valve bridges. When the engine is working, as the camshaft rotates, the power passes through the tappet and push rod, driving the rocker arm to rotate around the rocker shaft, so that the rocker arm drives the valve bridge to open the valve, thereby inputting air into the engine and discharging the exhaust gas after combustion in the engine. When the vehicle and the engine are in a stationary state, the valve bridge is in contact with the top of the valve stem under the action of gravity.

[0026] When the vehicle is driving on the road, if the vehicle collides with an uneven road surface, the freely movable parts such as the push rod, tappet, and valve bridge will collide with the fixed parts such as the rocker arm. The instantaneous high-speed collision will generate stress and deformation, and propagate in the parts in the form of waves, which is likely to damage the valve train parts such as the valve and rocker arm bolts, resulting in failures in the valve train system.

[0027] Based on this, the present application provides a valve bridge. When the valve bridge body is subjected to a collision impact during the operation of a four-valve engine, the spring structure provided inside the valve bridge can apply a reverse force to the spring cap to attenuate the collision impact force received by the spring cap.

[0028] Next, the technical solutions in the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] Please refer to Figure 1 , the present application provides a shock-absorbing valve bridge, which includes: a valve bridge body 1, a spring cap 2, and a spring structure 3; a deep hole 4 is provided on the valve bridge body 1, and the deep hole 4 is located at the center of the position where the rocker arm head presses the valve bridge body 1; one side of the spring structure 3 is fixedly connected to the bottom of the deep hole 4, and the other side is fixedly connected to the spring cap 2; the spring cap 2 is accommodated in the deep hole 4; when the valve bridge body 1 is subjected to a collision impact, the spring structure 4 is used to apply a reverse force to the spring cap 2 to attenuate the collision impact force received by the spring cap 2.

[0030] Specifically, for the deep hole 4 on the valve bridge body 1, the depth of the deep hole 4 is not limited, but it will not penetrate the valve bridge body 1. When the spring cap 2 in the deep hole 4 is subjected to an impact force, the spring cap 2 will move downward due to the pressure of the impact force, and then will press the spring structure 3 downward, causing the spring structure 3 to also undergo a certain deformation. In order to reduce the wear of the spring structure 3, the bottom surface of the deep hole 4 is set as a concave spherical surface. In this way, when the spring structure 3 undergoes deformation due to an instantaneous impact force, the speed of deformation can be slowed down, thereby playing a certain buffering role for the spring structure 3. Further, the bottom area of the deep hole is smaller than the area at the pressing position, that is, smaller than the area where the rocker arm head contacts the valve bridge body 1, so as to prevent the rocker arm head from sinking into the deep hole 4.

[0031] Optionally, for the spring cap 2, the spring cap 2 can be set as a hard cap-shaped structure, which can be made of a metal material, or a non-metal material such as plastic or rubber. In order to slow down the impact force on the spring cap 2 during the process of the valve train system being subjected to collision and impact, a rubber coating can be wrapped on the outer surface of the spring cap 2 to increase the friction between the spring cap 2 and the rocker arm head; a rubber impact block can also be embedded in the top of the spring cap 2. Further, in order to reduce the wear of the spring cap 2 during the operation of the valve train system, a buffer rubber can also be provided at the inner wall of the deep hole 4, so as to achieve the effect of reducing the acting force generated between the spring cap 2 and the inner surface of the deep hole 4.

[0032] Optionally, for the spring structure 3, in order to be able to judge whether the spring structure 3 needs to be replaced according to the wear condition of the spring structure 3, the spring cap 2 and the spring structure 3 can be set as a detachable connection. When it is determined that the spring structure 3 is severely worn and needs to be replaced, the connection between the spring cap 2 and the spring structure 3 can be disassembled, and after replacing the new spring structure 3, the connection with the spring cap 2 can be re-established. Moreover, in order to improve the anti-impact performance, that is, to increase the buffering force against collision, the spring structure 3 can at least include two springs, and the elastic strengths between the springs are different, some with greater elastic force and some with smaller elastic force.

[0033] For the valve train system, it is composed of two parts: the valve group and the valve drive group. Among them, the valve group is composed of parts such as the intake valve, exhaust valve, valve guide, and valve bridge body, and the valve drive group is composed of the camshaft, rocker arm shaft, rocker arm, push rod, and tappet, etc.

[0034] In the embodiment of the present application, when the four-valve engine is working, the valve bridge body 1 is driven by the camshaft through the tappet and the push rod. When the convex part of the cam lifts the tappet, the tappet can push the push rod to move upward together. The thrust acting on the rocker arm causes the rocker arm to rotate around the axis. The other end of the rocker arm compresses the valve spring to make the valve bridge body 1 move downward, that is, to open the combustion chamber. As the camshaft continues to rotate, when the convex part of the camshaft leaves the tappet, the valve bridge body 1 moves upward under the action of the valve spring force, that is, to close the combustion chamber. During the process of opening or closing the combustion chamber, due to the small gap between the spring cap 2 and the deep hole 4, when there is a collision impact, the air sealed by the spring cap 2 and the hole is difficult to leak out immediately, playing a certain air spring role. While the spring cap 2 moves downward, the spring structure 3 gives it a reverse acting force to prevent the spring cap 2 from moving downward, thereby slowing down the instantaneous collision speed between the valve bridge body 1 and the rocker arm during the collision impact, that is, reducing the collision impact force.

[0035] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to illustrate the relative positional relationship between each component or component part, and does not particularly limit the specific installation orientation of each component or component part.

[0036] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific situation.

[0037] In addition, the terms "install", "set", "be provided with", "connect", "be 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 directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, components or component parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific situation.

[0038] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to cooperate with the content disclosed in the specification for those of ordinary skill in the art to understand and read, and are not used to limit the implementable limiting conditions in the present application. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present application can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

Claims

1. A vibration-damping valve bridge, characterized in that, Including: A valve bridge body, a spring cap and a spring structure; A deep hole is provided on the valve bridge body, and the deep hole is located at the center of the position where the rocker arm head presses the valve bridge body; One side of the spring structure is fixedly connected to the bottom of the deep hole, and the other side is fixedly connected to the spring cap; The spring cap is accommodated in the deep hole; the bottom surface of the deep hole is an inner concave spherical surface, and the inner concave spherical surface is used to buffer the spring structure when the spring structure deforms under impact force; a buffer rubber is provided at the inner wall of the deep hole, and the buffer rubber is used to reduce the acting force generated between the spring cap and the inner surface of the deep hole; When the valve bridge body is subjected to a collision impact, the spring structure is used to apply a reverse force to the spring cap to attenuate the collision impact force received by the spring cap; The outer surface of the spring cap is wrapped with a rubber coating, and the rubber coating is used to slow down the impact on the spring cap; A rubber impact reduction block is inlaid on the top of the spring cap, and the rubber impact reduction block is used to increase the friction between the spring cap and the rocker arm head.

2. The vibration-damping valve bridge according to claim 1, characterized in that, The bottom area of the deep hole is smaller than the area of the pressing position.

3. The vibration-damping valve bridge according to claim 2, characterized in that, The spring cap is a hard cap-type structure.

4. The vibration-damping valve bridge according to claim 3, characterized in that, The spring cap and the spring structure are detachably connected.

5. The vibration-damping valve bridge according to claim 4, characterized in that, The spring structure includes at least two springs for increasing the buffer force against collision.

6. The vibration-damping valve bridge according to claim 5, characterized in that, The elastic strengths between the springs in the spring structure are different.

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