CN206360741U - A kind of intake and exhaust rocking arm - Google Patents

Abstract

The utility model provides an intake and exhaust rocker arm, which belongs to the technical field of engines. The utility model solves the technical problems of sliding friction between the intake and exhaust rocker arm and the valve pressure block in the transmission process, large frictional resistance and easy damage of components. The intake and exhaust rocker arm includes a rocker arm main body and a roller bearing 1 that can be in contact with the cam. The rocker arm main body includes side plate 1 and side plate 2 that are oppositely arranged, and the roller bearing 1 is hinged to the side plate 1 and side plate 2. Between the two side plates, one end of the main body of the rocker arm has a connection plate 1 which is fixedly connected with the side plate 1 and the side plate 2, and the lower side of the connection plate 1 is provided with a roller bearing 2, and the two ends of the roller bearing 2 are connected with the side plate respectively. The first is connected with the second side plate, the second roller bearing can freely rotate around its own axis, and the second roller bearing and the first roller bearing are arranged in parallel to the axis. The utility model improves the strength of the two side plates and converts the relative motion between the rocker arm and the valve system from sliding friction to rolling friction, reduces the frictional resistance, and improves the working stability of the valve rocker arm.

Description

An intake and exhaust rocker arm

technical field

The utility model belongs to the technical field of machinery and relates to an intake and exhaust rocker arm.

Background technique

The function of the intake and exhaust rocker arm mechanism is to open or close the intake and exhaust passages regularly under the action of the camshaft and push rod of the valve mechanism, so that fresh air can enter the cylinder, and the exhaust gas after combustion is discharged from the cylinder to realize The intake and exhaust process in the working cycle. The intake and exhaust rocker arm is an important part of the engine valve train, and the roller rocker arm is gradually applied to more automobile engines because of its high fuel efficiency and good mute effect.

The Chinese patent whose authorization number is CN 202970826 U discloses a diesel engine intake rocker arm transmission mechanism, including an intake rocker arm, a camshaft, a hydraulic tappet, a valve pressure block, and a roller bearing; wherein the intake rocker arm includes two A side support arm and a rocker shaft; the camshaft is a single overhead camshaft, which transmits the timing phase transmitted from the crankshaft to the roller bearing, and the roller bearing is connected to the intake rocker arm through the rocker shaft; the hydraulic lifter The column and the intake rocker arm are respectively positioned under the two ends of the intake rocker arm.

The above-mentioned roller rocker arm transmission mechanism is stable in transmission, but there are still some defects: there is sliding friction between the rocker arm and the valve pressure block in the transmission process, the friction resistance is large, and the parts are easily damaged.

Contents of the invention

The utility model provides an intake and exhaust rocker arm aiming at the above-mentioned problems in the existing technology. The technical problem to be solved by the utility model is: how to improve the working stability of the intake and exhaust rocker arm.

The purpose of this utility model can be achieved through the following technical solutions:

An intake and exhaust rocker arm, comprising a rocker arm main body and a roller bearing 1 that can be in contact with a cam, the rocker arm main body includes side plates 1 and 2 that are oppositely arranged, and the roller bearing 1 is hinged to the Between the side plate 1 and the side plate 2, the feature is that one end of the main body of the rocker arm has a connecting plate 1 fixedly connected with the side plate 1 and the side plate 2, and the lower side of the connecting plate 1 is provided with a roller Sub-bearing 2, the two ends of the roller bearing 2 are respectively connected to the side plate 1 and the side plate 2, the roller bearing 2 can freely rotate around its own axis, and the roller bearing 2 is arranged in parallel with the axis of the roller bearing 1 .

The working principle of the intake and exhaust rocker arm is as follows: one end of the main body of the rocker arm is in contact with the valve bridge, the other end is hinged with the adjustment mechanism, the first roller bearing is in contact with the cam on the camshaft, and the first and second side plates are roller bearings To provide stable force support, the valve bridge exerts an upward force on one end of the rocker arm body due to the elastic force of the pre-tightened spring set on the valve, so that the pair of roller bearing cams also produce an upward force, thereby maintaining the relative position. Stable, when the engine is running, the crank linkage mechanism starts to operate, the camshaft starts to rotate, the cam is an irregular circle, and once the roller bearing can rotate freely, it also moves up and down accordingly, and the end of the corresponding rocker arm body in contact with the valve bridge It also moves accordingly. After reasonable detailed design of the mechanism, the engine valve opening and closing time matches the cam phase, so as to achieve normal and lasting operation. By setting the roller bearing 2, the friction between the valve bridge and the rocker arm is rolling friction during the operation of the engine, which reduces the resistance compared with the sliding friction; the roller bearing 2 is arranged between the side plates and connected with the side plates, Long-term operation is under stress, and the side plates are easily deformed, which affects the matching accuracy, causing the rotation of the roller bearing to be blocked. By setting the connecting plate 1, the strength of the two side plates is increased, and the transmission is more stable; the axis of the roller bearing 2 is parallel to the roller bearing 1. Arrangement to ensure a stable direction of force transmission between the cam and the valve system.

In the aforementioned intake and exhaust rocker arm, an oil hole is provided on the first connecting plate, and the outlet of the oil hole faces the second roller bearing, and the oil hole is cylindrical, conical or hemispherical. There is rolling friction between the roller bearing 2 and the valve system, and the frictional resistance is relatively small. By opening an oil hole on the connecting plate 1, it is convenient to connect with the oil supply system to provide lubrication for the roller bearing 2, further reducing the frictional resistance.

In the aforementioned intake and exhaust rocker arm, the second roller bearing is arranged between the first side plate and the second side plate, and the outer diameter of the second roller bearing is smaller than that of the first roller bearing. In addition to the characteristics of rolling, the roller bearing is also a force bearing unit. When the roller rocker arm is working, the rocker arm body swings around the end that is in contact with the adjustment mechanism. From the principle of leverage, the load ratio of the roller bearing 2 can be known. The roller bearing arranged in the middle of the rocker arm body should be small, so the use of a roller bearing with a smaller outer diameter can meet the strength requirements and reduce cost and weight.

In the aforementioned intake and exhaust rocker arm, the end of the second side plate close to the second roller bearing has a platform stage, and the second roller bearing is arranged between the platform stage and the first side plate. The size of the roller bearing 2 is different from that of the roller bearing 1. By setting a platform stage on the side plate 2, the gap between the roller bearing 2 and the side plate is reduced to make the structure more compact, and the axial movement of the roller bearing is limited, so that The rocker arm works more stably.

In the above-mentioned intake and exhaust rocker arm, the other end of the main body of the rocker arm has a connecting plate 2 connecting the side plate 1 and the side plate 2, and the connecting plate 2 is provided with a hemispherical groove opening downward, An oil passage is opened at the bottom of the hemispherical groove, and the outlet of the oil passage faces the first roller bearing. Because the rocker arm will swing back and forth during the working process, the hemispherical groove is set to slide relative to the ball head of the hydraulic tappet in the adjustment mechanism, so as to realize normal operation. The oil channel opened at the bottom of the hemispherical groove is connected with the oil supply channel of the adjustment mechanism, The oil is sprayed through the outlet to the first roller bearing in contact with the cam to provide lubrication and reduce frictional resistance.

In the above-mentioned intake and exhaust rocker arm, the second connecting plate has a clamping protrusion, and the clamping protrusion is arranged at an end of the second connecting plate. The contact between the hemispherical groove and the adjustment mechanism is mainly guaranteed by the pressure of the cam on the rocker arm. However, the working conditions of the engine system are complicated. Such cooperation is extremely easy to be disengaged and invalidated by external force. By setting the clamping protrusion of the clamping ring, it is convenient for the clamping spring to lock it. It is connected with the hydraulic tappet, so that the hydraulic tappet is not easy to fall out, and the stability of the structure is better.

In the aforementioned intake and exhaust rocker arm, the second roller bearing is connected to the first side plate and the second side plate by riveting. The working environment around the engine is greatly affected by vibration, and the roller bearing 2 is often not disassembled frequently. The connection by riveting can ensure high connection stability, and riveting is more scientific and reasonable here.

Compared with prior art, the utility model has the following advantages:

1. The intake and exhaust rocker arm is equipped with a connecting plate and a roller bearing at the end where the main body of the rocker arm is in contact with the valve system, which improves the strength of the two side plates and reduces the relative movement between the rocker arm and the valve system by sliding friction. It is converted into rolling friction, which reduces the frictional resistance and improves the working stability of the valve rocker arm.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the cooperation between the intake and exhaust rocker arm and the cam.

Fig. 2 is a schematic front view of the intake and exhaust rocker arm.

Fig. 3 is a schematic bottom view of the intake and exhaust rocker arm.

In the figure, 1. Rocker arm main body; 2. Roller bearing one; 3. Cam; 4. Roller bearing two; 5. Side plate one; 6. Side plate two; 61. Platform stage; 7. Connecting plate one; 71. Oil hole; 8. Connecting plate two; 81. Hemispherical groove; 82. Oil passage; 83. Clamping bump; 9. Valve bridge.

detailed description

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figures 1-3, the intake and exhaust rocker arm includes a rocker arm body 1 and a roller bearing 1 that can abut against the cam 3, and the rocker arm body 1 includes a side plate 1 5 and a side plate 2 6 that are oppositely arranged. , the roller bearing one 2 is hinged between the side plate one 5 and the side plate two 6, one end of the rocker arm main body 1 has a connecting plate one 7 fixedly connected with the side plate one 5 and the side plate two 6, and the connecting plate one 7 The lower side is provided with roller bearing two 4, and the two ends of roller bearing two 4 are connected with side plate one 5 and side plate two 6 respectively, and roller bearing two 4 can rotate freely around its own axis, and roller bearing two 4 is connected with roller Bearing 1 and 2 are arranged in parallel to the axis. One end of the rocker arm main body 1 is in contact with the valve system, and the other end is hinged with the adjustment mechanism. The roller bearing 12 is in contact with the cam 3 on the cam 3 shaft. One end of 1 produces an upward force, so that the roller bearing 1 also produces an upward force on the cam 3, thereby maintaining a stable relative position. When the engine is running, the crank linkage mechanism starts to operate, and the 3-axis of the cam starts to rotate, and the cam 3 is an irregular circle, so the roller bearing 1 and 2 also undulate and move accordingly, and the end of the corresponding rocker arm body 1 in contact with the valve system also moves accordingly. After reasonable detailed design of the mechanism, the engine valve opening and closing time and Cams 3 are phase matched for proper and long lasting operation. By setting the roller bearing 2 4, the friction between the valve pressure block and the rocker arm is rolling friction during the operation of the engine, which is greatly reduced compared with the resistance of sliding friction; the roller bearing 2 4 is arranged between the side plates, and the long-term The side plate is easily deformed by force during operation, which affects the matching accuracy, causing the rotation of the roller bearing to be blocked. By setting the connecting plate 17, the strength of the two side plates is increased, and the transmission is more stable; the roller bearing 2 4 and the roller bearing 1 2 are The axes are arranged in parallel to ensure a stable direction of force transmission between the cam 3 and the valve system. Further speaking, the connecting plate 1 7 is provided with an oil hole 71 , the outlet of the oil hole 71 faces the roller bearing 2 4 , and the oil hole 71 is cylindrical, conical or hemispherical. There is rolling friction between the roller bearing 2 4 and the valve system, and the frictional resistance is relatively small. By opening the oil hole 71 on the connecting plate 1 7, it is convenient to connect with the oil supply system to provide lubrication for the roller bearing 2 4, further reducing the frictional resistance .

As shown in FIG. 3 , the second roller bearing 4 is arranged between the first side plate 5 and the second side plate 6 , and the outer diameter of the second roller bearing 4 is smaller than that of the first roller bearing 2 . In addition to the rolling characteristics, the roller bearing is also a force bearing unit. When the roller rocker arm is working, the rocker arm body swings around the end that is in contact with the adjustment mechanism. The load on the roller bearing 24 can be known from the principle of leverage It is smaller than the first roller bearing 2 arranged in the middle of the rocker arm body, so the smaller size of the roller bearing second 4 can meet the strength requirement and reduce the cost and weight. Furthermore, the end of the side plate 2 6 close to the roller bearing 2 4 has a stage 61 , and the roller bearing 2 4 is arranged between the stage 61 and the side plate 1 5 . The size of the roller bearing 2 4 is different from that of the roller bearing 1 2. By setting the stage 61 on the side plate 6, the fit gap between the roller bearing 2 4 and the side plate is reduced, making the structure more compact and limiting the roller bearing Axial movement improves structural stability.

As shown in Figures 1 and 3, the other end of the rocker arm main body 1 has a connecting plate 2 8 connecting the side plate 1 5 and the side plate 2 6, and the connecting plate 2 8 is provided with a hemispherical groove 81 with the opening facing downward, and the hemispherical groove 81 The bottom is provided with an oil passage 82, and the outlet of the oil passage 82 faces the roller bearing one 2. Because the rocker arm will swing back and forth during the working process, the hemispherical groove 81 is set to slide relative to the ball head of the hydraulic tappet in the adjustment mechanism, thereby realizing normal operation. The oil passage 82 provided at the bottom of the hemispherical groove 81 and the oil supply passage of the adjustment mechanism Connected, the oil is sprayed through the outlet to the roller bearing 1 in contact with the cam 3 to provide lubrication for it and further reduce frictional resistance. Further speaking, the connecting plate 2 8 has a clamping protrusion 83 , and the clamping protrusion 83 is arranged at the end of the connecting plate 2 8 . The contact between the hemispherical groove 81 and the adjustment mechanism is mainly guaranteed by the pressure of the cam 3 on the rocker arm. However, the engine system has complicated working conditions. Such cooperation is extremely easy to come out and fail due to external force. Connected to the bump 83, the lower end of the hydraulic tappet column head is generally designed with a corresponding card slot, and the smooth transition of the edge of the card slot provides a certain stroke space for the clamping piece to follow the rotation of the rocker arm, and at the same time makes the hydraulic tappet not easy to fall out, thus having a better performance. stability.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (7)

1. a kind of intake and exhaust rocking arm, including rocker arm body (1) and the roller bearing one (2) for being in contact with cam (3), described Rocker arm body (1) includes the side plate one (5) and side plate two (6) being oppositely arranged, and the roller bearing one (2) is articulated with the side plate Between one (5) and side plate two (6), it is characterised in that described rocker arm body (1) one end has and side plate one (5) and side plate two (6) Mutually solid connecting plate one (7), the downside of the connecting plate one (7) is provided with the roller bearing two (4) that can be contacted with air valve bridge (9), The two ends of the roller bearing two (4) are connected with side plate one (5) and side plate two (6) respectively, and the roller bearing two (4) can be around certainly Body axis is freely rotated, and roller bearing two (4) is arranged with the roller bearing one (2) in diameter parallel.

2. a kind of intake and exhaust rocking arm according to claim 1, it is characterised in that the connecting plate one (7) is provided with oilhole (71), oilhole (71) outlet is towards the roller bearing two (4), and the oilhole (71) is cylinder or cone or hemisphere Shape.

3. a kind of intake and exhaust rocking arm according to claim 1 or 2, it is characterised in that the external diameter of the roller bearing two (4) Less than the roller bearing one (2).

4. a kind of intake and exhaust rocking arm according to claim 3, it is characterised in that the side plate two (6) is close to the roller One end of bearing two (4) has step section (61), and the roller bearing two (4) is located at the step section (61) and the side plate one (5) between.

5. a kind of intake and exhaust rocking arm according to claim 1 or 2, it is characterised in that rocker arm body (1) other end tool There is the connecting plate two (8) for connecting the side plate one (5) and side plate two (6), the connecting plate two (8) is provided with downward opening half Ball groove (81), half ball groove (81) bottom offers oil duct (82), and the outlet of the oil duct (82) is towards the roller bearing One (2).

6. a kind of intake and exhaust rocking arm according to claim 5, it is characterised in that have on the connecting plate two (8) in length Square clamping projection (83), is easy to be connected with jump ring, and the clamping projection (83) is located at the end of the connecting plate two (8).

7. a kind of intake and exhaust rocking arm according to claim 1, it is characterised in that the roller bearing two (4) passes through riveting Mode be connected with side plate one (5) and side plate two (6).