Adjustable valve lift device

Abstract

The utility model discloses an adjustable valve lift device which comprises a valve adjusting device assembly, a lift adjusting shaft, an adjusting rod, a rocker, a rocker shaft, a rocker roller, a cam, a rocker connecting piece shaft, an elastic check ring for a shaft, a rocker connecting piece, a rocker, a tappet roller, a tappet shaft, a tappet, a supporting seat, a cam shaft, a fixed pressing plate and a valve. The device is simple in overall structure and convenient to machine, the valve can be adjusted in real time, the valve lift is adjusted in real time, transition is smooth, it is guaranteed that an existing valve gap is not affected in the lift changing process from the design principle, and operation reliability is high; in addition, the abrasion contact surfaces of the device are all roller mechanisms, so that the reliability and the service life of each part are greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of adjustable valve lift devices, specifically an adjustable valve lift device. Background Technology

[0002] Valve is a crucial component of an engine, used to supply fuel and expel combustion gases. Valve lift refers to the height the valve rises from its seat. Valve lift is of great importance in diesel engines, directly affecting engine performance and efficiency.

[0003] Traditional engine camshaft valve control systems have a fixed valve lift, determined by the camshaft size, making valve lift adjustment quite difficult. Furthermore, the drawback of fixed valve lift in traditional engines is their inability to flexibly adjust intake and exhaust efficiency according to different operating conditions. This results in insufficient intake and poor exhaust at low speeds, and an inability to fully utilize intake inertia and accelerate exhaust speed at high speeds. Consequently, this affects engine power output, fuel economy, and emissions performance, making it difficult to meet the high performance, high efficiency, and environmental protection requirements of modern automobiles. Currently, some variable valve actuation mechanisms exist on the market, but most are complex in structure, have poor manufacturability, and high manufacturing costs. Utility Model Content

[0004] The present invention proposes an adjustable valve lift device with a simple overall structure, easy processing, high manufacturability and reliability, which can realize real-time valve adjustment and has low manufacturing cost.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an adjustable valve lift device, comprising a valve adjusting device assembly, a support base, a camshaft, a fixed pressure plate, and a valve.

[0006] The valve adjustment assembly includes a lift adjustment shaft, an adjustment rod, a rocker arm, a rocker arm shaft, a rocker arm roller, a cam, a rocker arm connecting shaft, a shaft retaining ring, a rocker arm connecting piece, a rocker arm, a tappet roller, a tappet shaft, and a tappet.

[0007] The rocker arm connector connects the adjusting rod, the rocker arm, and the support base respectively. The other end of the adjusting rod is equipped with a lift adjusting shaft. The middle part of the rocker arm is connected to the rocker arm connector. The lower end face of the rocker arm is arc-shaped. One end of the rocker arm is in contact with the rocker rod through the spherical surface of the rocker rod roller. The other end of the rocker arm is in contact with the tappet through the spherical surface of the tappet roller. The cam is in contact with the rocker rod through the spherical surface of the rocker rod roller.

[0008] Furthermore, the rocker arm connector is connected to the adjusting rod, the rocker arm, and the support base respectively via the rocker arm connector shaft; and each rocker arm connector shaft is fitted with a shaft elastic retaining ring on its contact surface with the rocker arm connector.

[0009] Furthermore, the lift adjustment shaft is connected to the adjustment rod via a sliding bearing, and the lift adjustment shaft is an eccentric shaft.

[0010] Furthermore, the rocker roller is mounted on one end of the rocker via the rocker shaft, and the other end of the rocker is connected to the support base.

[0011] Furthermore, the tappet roller is mounted on one end of the tappet via the tappet shaft, and the other end of the tappet is connected to the valve via a fixed pressure plate.

[0012] Furthermore, the valve adjustment device assembly is provided in two sets, and is symmetrically mounted on the upper part of the cylinder head via support seats.

[0013] This utility model has the following beneficial effects:

[0014] 1. When the valve lift adjustment shaft is mechanically adjusted, the adjusting rod rotates, and the rocker arm connector rotates axially around the central rocker arm connector shaft. The rocker arm support point changes, thereby changing the valve rocker arm ratio and achieving variable valve lift. The valve lift adjustment transition is smooth in real time, and the design principle ensures that the existing valve clearance is not affected during the lift change, resulting in high operational reliability.

[0015] 2. The valve adjustment device assembly has two sets, which are symmetrically installed on the upper part of the cylinder head via support bases. This symmetrical structural design makes the entire device more evenly stressed during operation, thus improving the stability and reliability of the device.

[0016] 3. The rocker arm connector is connected to the support base, adjusting rod and rocker arm respectively through three rocker arm connector shafts. Each rocker arm connector shaft is equipped with two shaft elastic retaining rings at both ends. This connection method not only ensures the connection between the various components, but also effectively prevents the axial movement of the shaft and improves the reliability of the device.

[0017] 4. The lower end face of the rocker arm is arc-shaped, and one end of the rocker arm contacts the rocker arm through the spherical surface of the rocker arm roller, while the other end contacts the tappet through the spherical surface of the tappet roller. This spherical contact reduces friction and wear between components, improving the accuracy of motion transmission. The camshaft and rocker arm also make contact through the spherical surface of the rocker arm roller, further enhancing the smoothness and stability of motion transmission. Because all wear contact surfaces of this device are roller mechanisms, the reliability and lifespan of each component are greatly improved. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of an adjustable valve lift device proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the valve adjustment device assembly of an adjustable valve lift device proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of a rocker arm connector for an adjustable valve lift device proposed in this utility model;

[0021] Figure 4 This is a front view of the rocker arm connector of an adjustable valve lift device proposed in this utility model;

[0022] Figure 5 This is an exploded view of the rocker arm connector of an adjustable valve lift device proposed in this utility model.

[0023] Legend: 1. Valve adjustment assembly; 101. Lift adjustment shaft; 102. Adjustment rod; 103. Rocker arm; 104. Rocker arm shaft; 105. Rocker arm roller; 106. Cam; 107. Rocker arm connecting shaft; 108. Shaft retaining ring; 109. Rocker arm connecting piece; 110. Rocker arm; 111. Tappet roller; 112. Tappet shaft; 113. Tappet; 2. Support seat; 3. Camshaft; 4. Fixed pressure plate; 5. Valve. Detailed Implementation

[0024] The technical solutions of the present utility model will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof:

[0025] like Figures 1 to 5 As shown, this embodiment provides an adjustable valve lift device, including a valve adjustment device assembly 1, a support base 2, a camshaft 3, a fixed pressure plate 4, and a valve 5.

[0026] The valve adjustment device assembly 1 includes a lift adjustment shaft 101, an adjustment rod 102, a rocker arm 103, a rocker arm shaft 104, a rocker arm roller 105, a cam 106, a rocker arm connecting shaft 107, a shaft elastic retaining ring 108, a rocker arm connecting piece 109, a rocker arm 110, a tappet roller 111, a tappet shaft 112, and a tappet 113. The components cooperate with each other and realize valve lift adjustment through mechanical transmission, forming a complete adjustable valve lift device, providing a structural basis for adjusting valve lift.

[0027] The rocker arm connector 109 connects the adjusting rod 102, the rocker arm 110, and the support base 2 respectively. One end of the adjusting rod 102 is equipped with a lift adjusting shaft 101. The middle part of the rocker arm 110 is connected to the rocker arm connector 109. The lower end face of the rocker arm 110 is arc-shaped. One end of the rocker arm 110 is in spherical contact with the rocker arm 103 through the rocker arm roller 105. The other end of the rocker arm 110 is in spherical contact with the tappet 113 through the tappet roller 111. The cam 106 is in spherical contact with the rocker arm 103 through the rocker arm roller 105.

[0028] Furthermore, the rocker arm connector 109 is connected to the adjusting rod 102, the rocker arm 110, and the support base 2 via rocker arm connector shafts 107; and two shaft elastic retaining rings 108 are installed on the outer end of the contact surface between each rocker arm connector shaft 107 and the rocker arm connector 109. This connection method not only ensures the firmness of the connection between the various components and effectively prevents axial movement of the shaft, but also allows the rocker arm connector shaft 107 to rotate hingedly, with the shaft elastic retaining rings 108 limiting the movement, ensuring that the rocker arm connector 109 can rotate flexibly and the connection is stable, maintaining transmission reliability.

[0029] Furthermore, the lift adjustment shaft 101 is connected to the adjustment rod 102 via a sliding bearing, and the lift adjustment shaft 101 is an eccentric shaft. When the lift adjustment shaft 101 is adjusted, the adjustment rod 102 rotates, and the rocker arm connector 109 rotates axially around the intermediate rocker arm connector shaft 107, thereby changing the position of the rocker arm 110 support point.

[0030] Furthermore, the rocker roller 105 is mounted on one end of the rocker 103 via the rocker shaft 104, and the other end of the rocker 103 is connected to the support base 2. The rocker 103 uses the connection point with the support base 2 as a fulcrum, and drives the rocker roller 105 to swing via the rocker shaft 104, transmitting motion to the rocker roller 105 and providing power input for subsequent transmission.

[0031] Furthermore, the tappet roller 111 is mounted on one end of the tappet 113 via the tappet shaft 112, and the other end of the tappet 113 is connected to the valve 5 via the fixed pressure plate 4. The tappet roller 111 transmits motion to the tappet 113, and the tappet 113 drives the valve 5 to perform reciprocating linear motion, realizing the transmission of motion from the roller to the valve 5, and driving the valve 5 to open and close.

[0032] Furthermore, the valve adjusting device assembly 1 is provided in two sets, and is symmetrically installed on the upper part of the cylinder head via support base 2. The valve adjusting device assembly 1 is positioned by the support base 2, and the movement is transmitted to the valve 5 through the fixed pressure plate 4, ensuring stable installation of the device and realizing a reliable connection between the valve 5 and the adjusting device.

[0033] When in use, when the starter motor drives the lift adjustment shaft 101 to rotate, the adjustment rod 102 rotates, causing the rocker arm connector 109 to rotate axially around the intermediate rocker arm connector shaft 107, thereby changing the support point position of the rocker arm 110, that is, the position of the rocker arm 110 is changed, thereby adjusting the lift of the valve 5.

[0034] The cam 106 rotates, and its contour curve drives the rocker arm 103 to swing around its connection point with the support 2 via the rocker arm roller 105. One end of the rocker arm 110 is in spherical contact with the rocker arm 103 via the rocker arm roller 105, and the other end is in spherical contact with the tappet 113 via the tappet roller 111. This contact method reduces friction. Since the wear contact surfaces of this device are all roller mechanisms, the reliability and lifespan of each component are greatly improved. When the support point of the rocker arm 110 changes, the valve rocker arm ratio is changed. The motion transmitted by the rocker arm 103 is changed in amplitude by the rocker arm 110, and then the tappet roller 111 and the tappet 113 drive the valve 5 to perform reciprocating linear motion with different strokes, ultimately realizing the adjustment of valve lift.

Claims

1. An adjustable valve lift device, characterized in that: It includes a valve adjustment assembly (1), a support base (2), a camshaft (3), a fixed pressure plate (4), and a valve (5). The valve adjustment assembly (1) includes a lift adjustment shaft (101), an adjustment rod (102), a rocker arm (103), a rocker arm shaft (104), a rocker arm roller (105), a cam (106), a rocker arm connecting shaft (107), a shaft elastic retaining ring (108), a rocker arm connecting piece (109), a rocker arm (110), a tappet roller (111), a tappet shaft (112), and a tappet (113); The rocker arm connector (109) connects the adjusting rod (102), the rocker arm (110), and the support base (2) respectively. The other end of the adjusting rod (102) is equipped with a lift adjusting shaft (101). The middle part of the rocker arm (110) is connected to the rocker arm connector (109). The lower end face of the middle part of the rocker arm (110) is arc-shaped. One end of the rocker arm (110) is in spherical contact with the rocker arm (103) through the rocker arm roller (105). The other end of the rocker arm (110) is in spherical contact with the tappet (113) through the tappet roller (111). The cam (106) is in spherical contact with the rocker arm (103) through the rocker arm roller (105).

2. The adjustable valve lift device according to claim 1, characterized in that: The rocker arm connector (109) is connected to the adjusting rod (102), the rocker arm (110) and the support base (2) respectively via the rocker arm connector shaft (107); and each rocker arm connector shaft (107) is equipped with an elastic retaining ring (108) on the contact surface with the rocker arm connector (109).

3. The adjustable valve lift device according to claim 2, characterized in that: The lift adjustment shaft (101) is connected to the adjustment rod (102) via a sliding bearing, and the lift adjustment shaft (101) is an eccentric shaft.

4. The adjustable valve lift device according to claim 3, characterized in that: The rocker roller (105) is mounted on one end of the rocker (103) via the rocker shaft (104), and the other end of the rocker (103) is connected to the support base (2).

5. An adjustable valve lift device according to claim 4, characterized in that: The tappet roller (111) is installed at one end of the tappet (113) via the tappet shaft (112), and the other end of the tappet (113) is connected to the valve (5) via the fixed pressure plate (4).

6. An adjustable valve lift device according to claim 5, characterized in that: The valve adjustment device assembly (1) is provided in two sets and is symmetrically installed on the upper part of the cylinder head via a support (2).

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