CN204283526U - A kind of without roller valve rocker - Google Patents

Abstract

The utility model provides a roller-free valve rocker arm, which includes a rocker body with an arched structure, an arc part contacting with a cam is arranged on the outer surface of the arched part of the rocker body, and two inner sides of the arched part of the rocker body The ball pit and the contact arc part with the valve stem are respectively provided at the end of the hydraulic clearance adjuster, and the cam contact arc part, the ball pit and the contact arc part with the valve stem are all integrally connected with the rocker body. Preferably, it also includes two opposing limiting ribs, the limiting ribs are integrated with the cam contact arc, the ball pit, and the valve stem contact arc. The utility model cancels the assembly of the needle roller bearing necessary for the traditional valve rocker arm and the pin hole matched with the needle roller bearing, the overall structure is simpler, and the weight of the valve rocker arm assembly is also greatly reduced, reducing the valve rocker The moment of inertia of the arm is conducive to improving the production efficiency of the valve rocker arm, reducing the production cost, and reducing the mechanical loss of the engine.

Description

A Rollerless Valve Rocker Arm

technical field

The utility model relates to the technical field of valve rocker arms, in particular to a roller-free valve rocker arm for automobile engines.

Background technique

With the rapid development of the automobile industry, people put forward higher and higher requirements for the power and economy of automobile engines, which promotes the development of automobile engines in the direction of strengthening, high speed, low fuel consumption, and low emissions. Products put forward higher requirements. Valve rocker arm is one of the key components of automobile engine, further improving its wear resistance, reducing its own weight, and improving its service life have always been the goals pursued by the design and manufacture of valve rocker arm.

Among the existing valve rocker arm products produced at home and abroad, most of the valve rocker arms have a roller bearing structure. This kind of valve rocker arm with roller bearings needs to be processed in the valve rocker arm assembly. On the rocker arm body, the pin shaft hole matching the bearing is processed first, then the bearing is fixed in the pin shaft hole, and finally the roller and the bearing are assembled. Therefore, this valve rocker arm product not only has many parts and complex structure, but also increases the production process of the entire valve rocker arm and has a long production cycle, which increases the weight of the assembled valve rocker arm assembly itself, and the rotation of the valve rocker arm The inertia is difficult to reduce, and it is easy to cause the valve rocker arm to fly off during high-speed swing, resulting in abnormalities in the engine.

Utility model content

The technical problem to be solved by the utility model is: aiming at the problems existing in the prior art, provide a roller-less valve rocker arm, which reduces its own weight, has a simple structure, and improves the production efficiency of the valve rocker arm assembly.

The technical problem to be solved by the utility model is realized by the following technical solutions: a roller-less valve rocker arm, including a rocker arm body, the rocker arm body is an arched structure, and a cam is arranged on the outer surface of the arched portion. In the contact arc part, the two ends of the inner side of the arch part are respectively provided with a ball pit that cooperates with the ball head of the hydraulic clearance adjuster and a contact arc part with the valve stem. The cam contact arc part, ball pit and The circular arc parts in contact with the valve stem are integrally connected with the rocker arm body.

Preferably, it also includes two limiting ribs standing opposite to each other, and the limiting ribs integrate the cam contact arc, the ball pit, and the valve stem contact arc as a whole.

Preferably, the limiting rib is integrally connected with the rocker body.

Preferably, the two limiting ribs are arranged parallel to each other.

Preferably, an oil injection hole is opened on the rocker body, and the oil injection hole and the ball pit communicate with each other.

Preferably, the angle between the central axis of the oil injection hole and the horizontal plane is an acute angle.

Preferably, the central axis of the oil injection hole is tangent to the contact arc portion of the cam.

Preferably, the valve rocker arm is made of low carbon steel or aluminum alloy.

Compared with the prior art, the beneficial effect of the utility model is that: on the rocker arm body of the arched structure, the arc portion that contacts the cam, the ball pit that cooperates with the ball head of the hydraulic clearance adjuster and the valve stem The circular arc part is integrated and directly processed, which cancels the needle roller bearing which is necessary for the traditional valve rocker arm and the pin hole matched with the needle roller bearing, which greatly shortens the processing technology of the valve rocker arm assembly, and the overall The structure is simpler, and the weight of the valve rocker arm assembly is also greatly reduced, which makes the production and processing of the valve rocker arm products easier, improves the production efficiency of the valve rocker arm, and is conducive to reducing production costs; at the same time, it also makes the valve rocker arm The moment of inertia is reduced, which is beneficial to reduce the mechanical loss of the engine and improve the power performance of the engine.

Description of drawings

Fig. 1 is a three-dimensional structure diagram (bottom view) of a roller-less valve rocker arm of the present invention.

Fig. 2 is a three-dimensional structure diagram (side view) of a roller-less valve rocker arm of the present invention.

Fig. 3 is a front view of a roller-less valve rocker arm of the present invention.

Fig. 4 is a top view of a roller-less valve rocker arm of the present invention.

Fig. 5 is a sectional view along A-A in Fig. 4 .

Fig. 6 is a bottom view of a roller-less valve rocker arm of the present invention.

Fig. 7 is a left view of a roller-less valve rocker arm of the present invention.

Fig. 8 is a right view of a roller-less valve rocker arm of the present invention.

Fig. 9 is a working principle diagram of a roller-less valve rocker arm of the present invention.

Marks in the figure: 1-rocker arm body, 2-cam, 3-return spring, 4-valve stem, 5-hydraulic lash adjuster, 11-arc part in contact with cam, 12-arc part in contact with valve stem, 13-limit rib, 14-ball pit, 15-spray hole.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

A kind of rollerless valve rocker shown in Fig. 1, Fig. 2, Fig. 3, Fig. 5, its main body part is the rocker body 1 of arched structure, in the arched part of described rocker body 1 The outer surface is provided with a cam contact arc portion 11, and the two ends of the inner side of the rocker body 1 arch portion are respectively provided with a ball pit 14 that cooperates with the ball head of the hydraulic clearance adjuster and a contact arc portion 12 with the valve stem. The arc portion 11 in contact with the cam, the ball pit 14 and the arc portion 12 in contact with the valve stem are all integrally connected with the rocker arm body 1 .

The rocker body 1, the cam 2, the valve stem 4, the return spring 3 and the hydraulic clearance adjuster 5 in the roller-less valve rocker arm of the utility model together form a gas distribution mechanism as shown in Fig. 9, wherein the cam 2 is located at Between the hydraulic lash adjuster 5 and the valve rod 4, and in contact with the cam contact arc portion 11 on the outer surface of the arched part of the rocker body 1; the valve rod 4 is at the right end of the rocker body 1, and The inner side of the arm body 1 is in contact with the valve stem contact arc portion 12; the return spring 3 is sleeved on the valve stem 4; the hydraulic clearance adjuster 5 is located at the left end of the rocker arm body 1, and the ball head at the end The part matches with the ball pit 14.

When the gas distribution mechanism is working, the rotary motion of the cam 2 is transmitted through the rocker body 1, so that the rocker body 1 can swing around the hydraulic clearance adjuster 5 as a fulcrum, so that the motion of the cam 2 can be transmitted to the valve stem 4 to drive the valve Rod 4 moves linearly downward. During the downward movement of the valve stem 4, the return spring 3 is compressed, and the return spring 3 applies a reverse thrust to the valve stem 4 to drive the valve stem 4 to reset. Since the cam contact arc portion 11 on the rocker arm body 1 is in direct contact with the high-speed rotating cam 2, in order to reduce the friction and wear between the cam contact arc portion 11 and the cam 2, the use of the valve rocker arm can be improved. As shown in Fig. 2, Fig. 4 and Fig. 5, an oil injection hole 15 is opened on the rocker arm body 1, and the oil injection hole 15 and the ball pit 14 communicate with each other. Usually, the central axis of the oil injection hole 15 is in line with the The angle between the horizontal planes is an acute angle, as shown in Figure 9, to ensure that the lubricating oil sprayed from the oil injection hole 15 can be sprayed to the cam 2 or the arc portion 11 of the rocker body 1 that is in contact with the cam, thereby The friction parts between the cam contact arc portion 11 and the cam 2 are lubricated. If the inclination angle of the appropriate oil injection hole 15 is set, the central axis of the oil injection hole 15 is tangent to the cam contact arc portion 11, so that the lubricating oil ejected from the oil injection hole 15 can be directly injected to the cam 2 and the rocker. The friction parts on the arm body 1 that are in contact with the cam contact arc portion 11 avoid splashing of lubricating oil, which is beneficial to saving the consumption of lubricating oil.

In order to improve the reliability and stability of the operation of the gas distribution mechanism, two limiting ribs 13 parallel to each other can be arranged on both sides of the rocker body 1, and the limiting ribs 13 will contact the arc portion 11 and the ball of the cam. The pit 14 is integrated with the valve stem contact arc portion 12, and the limiting rib 13 is integrally connected with the rocker body 1, as shown in FIGS. 1 , 2 , 6 , 7 and 8 . With such a structure, when the gas distribution mechanism is working, the swing range of the hydraulic clearance adjuster 5 and the valve rod 4 can be limited by two limiting ribs 13, which can effectively prevent the rocker body 1 from moving at the upper end of the valve rod 4. It also reduces the processing steps of the valve rocker arm, which is beneficial to reduce the production cost.

In the valve rocker arm of the utility model, the arc portion 11 in contact with the cam, the arc portion 12 in contact with the valve stem, and the ball pit 14 are all integrally connected with the rocker body 1, and the rocker body 1 and the arc portion in contact with the cam 11. The structure of the arc portion 12 in contact with the valve stem and the ball pit 14 is relatively simple. For this, the rocker body 1, the arc portion 11 in contact with the cam, the ball pit 14 and the The valve stem contact arc portion 12 is integrally processed and formed at one time. In order to facilitate processing, the valve rocker arm is made of low-carbon steel or aluminum alloy. Since low-carbon steel or aluminum alloy has good stamping ductility and mechanical strength, the above-mentioned valve rocker arm is made of low-carbon steel or aluminum alloy. , the entire valve rocker arm structure can be directly integrated and stamped through a special production mold, and the valve rocker arm products can be mass-produced through a special production mold, which not only greatly improves production efficiency, but also ensures that the valve rocker arm produced by the mold The consistency and stability of the quality of the arm product reduces the overall cost of the valve rocker arm product.

Because the three contact surfaces on the valve rocker arm that need to be in contact with the hydraulic clearance adjuster 5, the valve stem 4 and the cam 2 are integrally and directly processed and formed, there is no need to make the pin holes that match the needle bearings necessary for the traditional valve rocker arm , reducing the processing steps, and meanwhile, the valve rocker arm assembly of the utility model does not need the assembly of the needle bearing. Therefore, its overall structure is simpler, and the weight of the valve rocker arm assembly is also greatly reduced, thereby reducing the moment of inertia of the valve rocker arm, which is beneficial to reducing the mechanical loss of the engine and improving the power performance of the engine; moreover, the valve rocker arm product Production and processing are also easier, which improves the production efficiency of valve rocker products and reduces production costs.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. It should be pointed out that any modification, equivalent replacement and improvement made within the spirit and principles of the utility model, etc., All should be included within the protection scope of the present utility model.

Claims (8)

1. A roller-free valve rocker arm, comprising a rocker body (1), characterized in that: the rocker body (1) is an arched structure, and an arc contacting with the cam is arranged on the outer surface of the arched portion part (11), the two ends of the inner side of the arched part are respectively provided with a ball pit (14) matching with the ball head of the hydraulic clearance adjuster and a contact arc part (12) with the valve stem, and the contact circle with the cam The arc portion (11), the ball pit (14) and the arc portion (12) in contact with the valve stem are all integrally connected with the rocker arm body (1). 2. A rollerless valve rocker arm according to claim 1, characterized in that it further comprises two limiting ribs (13) facing each other, and the limiting ribs (13) will be in contact with the cam The arc portion (11), the ball pit (14), and the contact arc portion (12) of the valve stem are connected as a whole. 3. The rollerless valve rocker arm according to claim 2, characterized in that: the limiting rib (13) is integrally connected with the rocker arm body (1). 4. A rollerless valve rocker arm according to claim 2, characterized in that the two limiting ribs (13) are arranged parallel to each other. 5. A roller-less valve rocker arm according to any one of claims 1-4, characterized in that: an oil injection hole (15) is opened on the rocker arm body (1), and the oil injection hole ( 15) communicate with the ball pit (14). 6. A rollerless valve rocker arm according to claim 5, characterized in that: the angle between the central axis of the oil injection hole (15) and the horizontal plane is an acute angle. 7. A rollerless valve rocker arm according to claim 5, characterized in that: the central axis of the oil injection hole (15) is tangent to the cam contact arc portion (11). 8. A rollerless valve rocker arm according to any one of claims 1-4, characterized in that: the valve rocker arm is made of low carbon steel or aluminum alloy.