A valve lift adjustable valve train

Abstract

The utility model discloses a valve lift adjustable gas distribution mechanism relates to engine field. The valve lift adjustable gas distribution mechanism, including core shaft, first switching sliding sleeve, second switching sliding sleeve, adjusting unit, double cam mechanism and gas distribution subassembly, first switching sliding sleeve and second switching sliding sleeve all movably cover the outside of core shaft, and two adjusting units are connected with first switching sliding sleeve and second switching sliding sleeve respectively, and multiple double cam mechanisms are connected with first switching sliding sleeve and second switching sliding sleeve respectively, and multiple gas distribution subassembly is connected with multiple double cam mechanisms respectively. The valve lift adjustable gas distribution mechanism, the existing engine single cam structure assembly type camshaft is changed to the core shaft with first switching sliding sleeve and second switching sliding sleeve, and adjusting unit is added to control the axial switching movement of first switching sliding sleeve and second switching sliding sleeve, realizes two cylinder linkage's valve lift regulation.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to a valve train mechanism with adjustable valve lift. Background Technology

[0002] As regulations become increasingly stringent regarding fuel consumption and emissions, and as demands for engine miniaturization and integration rise, maintaining a leading position in the market requires new engines to be designed to meet both low-speed power requirements and high-speed fuel economy. This presents a significant challenge for valve trains using traditional single cam profiles. This invention primarily addresses the following two technical challenges:

[0003] 1) Traditional single cam profile valve train cannot simultaneously meet the optimal charging efficiency requirements of low-speed engine power and high-speed economy, resulting in poor fuel economy and high emissions.

[0004] 2) Existing variable valve lift adjustment technologies mostly use single-cylinder solenoid valves for independent adjustment, which has the disadvantages of complex structure, high space requirements, large number of parts, high cost, and complex control logic. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a valve train mechanism with adjustable valve lift, which solves the problem that traditional single cam profile valve train mechanisms cannot simultaneously meet the optimal charging efficiency requirements of low-speed engine power and high-speed fuel economy, resulting in poor fuel economy and high emissions. Existing variable valve lift adjustment technologies mostly use independent adjustment of single-cylinder solenoid valves, which have problems such as complex structure, high space requirements, many parts, high cost, and complex control logic.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a valve lift adjustable valve train, comprising:

[0007] mandrel;

[0008] The first switching sleeve and the second switching sleeve are both movably sleeved on the outside of the spindle, and the first switching sleeve and the second switching sleeve are used for valve lift adjustment of different cylinders.

[0009] The two adjustment units are respectively connected to the first switching sleeve and the second switching sleeve;

[0010] The double cam mechanism is movably sleeved on the outside of the spindle, and multiple double cam mechanisms are respectively connected to the first switching sleeve and the second switching sleeve;

[0011] The valve train assembly, wherein multiple valve train assemblies are respectively connected to multiple double cam mechanisms;

[0012] The first and second switching sleeves are driven to move axially by the adjustment unit, which in turn moves the double cam mechanism relative to the valve train assembly, changing the contact position between the double cam mechanism and the valve train assembly, thereby changing the valve lift.

[0013] Preferably, the adjustment unit includes:

[0014] Adjust the solenoid valve;

[0015] The gradient wedge mechanism is integrally integrated on the outside of the first and second switching sleeves.

[0016] Preferably, the regulating solenoid valve includes:

[0017] The solenoid valve body is located at the top of the gradually changing wedge mechanism;

[0018] The first output pin and the second output pin are disposed at the output end of the solenoid valve body. The solenoid valve body can drive the first output pin and the second output pin to output respectively, and the first output pin and the second output pin are respectively located on both sides of the gradually changing wedge mechanism.

[0019] Preferably, the dual-cam mechanism consists of a first peach-shaped cam plate and a second peach-shaped cam plate of different sizes, and the connection between the first peach-shaped cam plate and the second peach-shaped cam plate is rounded.

[0020] Preferably, the gas distribution assembly includes:

[0021] A roller rocker arm has a roller fixedly installed at its center position, and the roller is in close contact with the first peach-shaped cam or the second peach-shaped cam.

[0022] Valve spring, which is located below one end of the roller rocker arm;

[0023] The valve body has its stem passing through the valve spring and connected to one end of the roller rocker arm;

[0024] A hydraulic tappet, the top of which is connected to the other end of a roller rocker arm;

[0025] When the first or second peach-shaped cam plate rotates, its cam structure drives the roller to rotate, causing the roller rocker arm to swing around its center position, thereby driving the valve body and hydraulic tappet to move back and forth.

[0026] Preferably, valve springs are fitted with valve spring seats and valve spring lower washers at their two ends. The valve spring seats are fixedly connected to the outer side of the valve body rod, and the valve spring lower washers are disposed on the engine cylinder. The valve springs provide a preload force to the valve body when it is closed through their elastic force, ensuring that the valve body can fit tightly against the valve seat ring and preventing cylinder leakage.

[0027] Preferably, the roller rocker arm is configured as a narrow rocker arm, and the outer edge of its roller is rounded, so that the contact position between the first peach-shaped cam plate and the second peach-shaped cam plate and the roller rocker arm can be adjusted when the double cam mechanism moves laterally.

[0028] This utility model discloses a valve lift adjustable valve train, which has the following beneficial effects:

[0029] 1. The valve lift adjustable valve train replaces the existing engine single camshaft structure with a spindle with a first switching sleeve and a second switching sleeve, and adds an adjustment unit to control the axial switching movement of the first switching sleeve and the second switching sleeve, so as to realize the valve lift adjustment of two cylinders.

[0030] 2. This valve lift adjustable valve train, when the engine requires different combustion cycles, uses the solenoid valve body to drive the first output pin or the second output pin, and through pressing and fixing the gradually changing wedge-shaped mechanism on the outside of the first and second switching sleeves, realizes the axial movement of the first and second switching sleeves, changes the contact position of the roller rocker arm roller with the first and second peach-shaped cams of different sizes, thereby changing the valve lift and thus changing the engine's combustion cycle. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the first switching sleeve, the air distribution assembly, and the adjustment unit of this utility model;

[0034] Figure 3 This is a schematic diagram of the one-cylinder and two-cylinder linkage switching strategy of this utility model;

[0035] Figure 4This is a schematic diagram showing the timing of the three-cylinder and four-cylinder linkage switching of this utility model.

[0036] In the diagram: 1. Spindle; 2. First switching sleeve; 3. Second switching sleeve; 4. Adjustment unit; 41. Adjustment solenoid valve; 411. Solenoid valve body; 412. First output pin; 413. Second output pin; 42. Gradient wedge mechanism; 5. Double cam mechanism; 51. First peach-shaped cam; 52. Second peach-shaped cam; 6. Valve train assembly; 61. Roller rocker arm; 62. Valve spring; 63. Valve body; 64. Hydraulic tappet; 65. Valve spring seat; 66. Lower valve spring washer. Detailed Implementation

[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0038] This utility model discloses a valve lift adjustable valve train.

[0039] According to the appendix Figure 1-4 As shown, it includes:

[0040] Mandrel 1;

[0041] The first switching sleeve 2 and the second switching sleeve 3 are both movably sleeved on the outside of the spindle 1, and the first switching sleeve 2 and the second switching sleeve 3 are used for valve lift adjustment of different cylinders.

[0042] Adjustment unit 4, the two adjustment units 4 are respectively connected to the first switching slide 2 and the second switching slide 3;

[0043] The double cam mechanism 5 is movably sleeved on the outside of the spindle 1, and multiple double cam mechanisms 5 are respectively connected to the first switching sleeve 2 and the second switching sleeve 3;

[0044] Valve train assembly 6, and multiple valve train assemblies 6 are respectively connected to multiple double cam mechanisms 5;

[0045] The first switching sleeve 2 and the second switching sleeve 3 are driven to move axially by the adjustment unit 4, which drives the double cam mechanism 5 to move relative to the valve train 6, thereby changing the contact position between the double cam mechanism 5 and the valve train 6, and thus changing the valve lift.

[0046] The existing engine single-cam structure assembled camshaft is replaced with a spindle 1 with a first switching sleeve 2 and a second switching sleeve 3. An adjustment unit 4 is added to control the axial switching movement of the first switching sleeve 2 and the second switching sleeve 3, so as to realize the valve lift adjustment of two cylinders.

[0047] Specifically disclosed, the adjustment unit 4 includes:

[0048] Adjusting solenoid valve 41;

[0049] The gradient wedge mechanism 42 is integrally integrated on the outside of the first switching sleeve 2 and the second switching sleeve 3.

[0050] Specifically disclosed, the regulating solenoid valve 41 includes:

[0051] The solenoid valve body 411 is located on top of the gradually changing wedge mechanism 42;

[0052] The first output pin 412 and the second output pin 413 are disposed at the output end of the solenoid valve body 411. The solenoid valve body 411 can drive the first output pin 412 and the second output pin 413 to output respectively, and the first output pin 412 and the second output pin 413 are respectively located on both sides of the gradual wedge mechanism 42.

[0053] Specifically disclosed, the double cam mechanism 5 is composed of a first peach-shaped cam plate 51 and a second peach-shaped cam plate 52 of different sizes, and the connection between the first peach-shaped cam plate 51 and the second peach-shaped cam plate 52 is rounded.

[0054] Specifically disclosed, the valve train 6 includes:

[0055] The roller rocker arm 61 has a roller fixedly installed at its center position, and the roller is in close contact with the first peach-shaped cam 51 or the second peach-shaped cam 52.

[0056] Valve spring 62 is located below one end of roller rocker arm 61;

[0057] The valve body 63 has its stem passing through the valve spring 62 and connected to one end of the roller rocker arm 61;

[0058] A hydraulic tappet 64, the top of which is connected to the other end of a roller rocker arm 61;

[0059] When the first peach-shaped cam 51 or the second peach-shaped cam 52 rotates, its cam structure can drive the roller to rotate, causing the roller rocker arm 61 to swing around its center position, thereby driving the valve body 63 and the hydraulic tappet 64 to reciprocate.

[0060] Specifically disclosed, valve spring 62 is equipped with valve spring seat 65 and valve spring lower washer 66 at both ends. Valve spring seat 65 is fixedly connected to the outer side of the valve body 63 rod, and valve spring lower washer 66 is set on the engine cylinder. Valve spring 62 provides preload force to valve body 63 when closed through its elastic force, ensuring that valve body 63 can fit tightly against valve seat ring and prevent cylinder leakage.

[0061] Furthermore, the roller rocker arm 61 is configured as a narrow rocker arm, and the outer edge of its roller is rounded. When the double cam mechanism 5 moves laterally, the contact position between the first peach-shaped cam plate 51 and the second peach-shaped cam plate 52 and the roller rocker arm 61 can be adjusted.

[0062] The roller rocker arm 61 is equipped with a roller that directly contacts either the first peach-shaped cam 51 or the second peach-shaped cam 52. The shape of the first peach-shaped cam 51 or the second peach-shaped cam 52 determines the degree and duration of valve opening. As the contact position between the roller and the first peach-shaped cam 51 or the second peach-shaped cam 52 changes, the valve lift also changes accordingly. The roller rocker arm 61, as an intermediate transmission component, precisely transmits the movement of the first peach-shaped cam 51 or the second peach-shaped cam 52 to the valve, thereby realizing the opening and closing of the valve.

[0063] When the engine requires different combustion cycles, the solenoid valve body 411 drives the first output pin 412 or the second output pin 413 to press and fix the gradual wedge mechanism 42 on the outside of the first switching sleeve 2 and the second switching sleeve 3, thereby realizing the axial movement of the first switching sleeve 2 and the second switching sleeve 3. This changes the contact position between the roller of the roller rocker arm 61 and the first peach-shaped cam 51 and the second peach-shaped cam 52 of different sizes, thereby changing the valve lift and thus changing the engine's combustion cycle.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A valve lift adjustable valve train, characterized in that, include: mandrel (1); The first switching sleeve (2) and the second switching sleeve (3) are both movably sleeved on the outside of the spindle (1), and the first switching sleeve (2) and the second switching sleeve (3) are used for valve lift adjustment of different cylinders. Adjustment unit (4), the two adjustment units (4) are respectively connected to the first switching sleeve (2) and the second switching sleeve (3); The double cam mechanism (5) is movably sleeved on the outside of the spindle (1), and multiple double cam mechanisms (5) are respectively connected to the first switching sleeve (2) and the second switching sleeve (3); The valve train assembly (6) is connected to a plurality of double cam mechanisms (5); The first switching sleeve (2) and the second switching sleeve (3) are driven to move axially by the adjustment unit (4), which drives the double cam mechanism (5) to move relative to the valve train assembly (6), thereby changing the contact position between the double cam mechanism (5) and the valve train assembly (6) and thus changing the valve lift.

2. The valve lift adjustable valve train according to claim 1, characterized in that, The adjustment unit (4) includes: Adjusting solenoid valve (41); The gradient wedge mechanism (42) is integrated on the outside of the first switching sleeve (2) and the second switching sleeve (3).

3. The valve lift adjustable valve train according to claim 2, characterized in that, The regulating solenoid valve (41) includes: The solenoid valve body (411) is located on top of the gradually changing wedge mechanism (42); The first output pin (412) and the second output pin (413) are disposed at the output end of the solenoid valve body (411). The solenoid valve body (411) can drive the first output pin (412) and the second output pin (413) to output respectively, and the first output pin (412) and the second output pin (413) are respectively located on both sides of the gradient wedge mechanism (42).

4. The valve lift adjustable valve train according to claim 1, characterized in that, The double cam mechanism (5) is composed of a first peach-shaped cam plate (51) and a second peach-shaped cam plate (52) of different sizes, and the connection between the first peach-shaped cam plate (51) and the second peach-shaped cam plate (52) is rounded.

5. A valve lift adjustable valve train according to claim 4, characterized in that, The gas distribution assembly (6) includes: The roller rocker arm (61) has a roller fixedly installed at its center, and the roller is in close contact with the first peach-shaped cam (51) or the second peach-shaped cam (52); Valve spring (62) is located below one end of roller rocker arm (61); The valve body (63) has its stem passing through the valve spring (62) and connected to one end of the roller rocker arm (61); A hydraulic tappet (64) has its top end connected to the other end of a roller rocker arm (61); When the first peach-shaped cam (51) or the second peach-shaped cam (52) rotates, it can drive the roller to rotate through its cam structure, so that the roller rocker arm (61) swings at its center position, thereby driving the valve body (63) and the hydraulic tappet (64) to move back and forth.

6. The valve lift adjustable valve train according to claim 5, characterized in that, The valve spring (62) is equipped with a valve spring seat (65) and a valve spring lower washer (66) at both ends. The valve spring seat (65) is fixedly connected to the outer side of the valve body (63) rod, and the valve spring lower washer (66) is set on the engine cylinder.

7. A valve lift adjustable valve train according to claim 5, characterized in that, The roller rocker arm (61) is configured as a narrow rocker arm, and the outer edge of its roller is rounded. When the double cam mechanism (5) moves laterally, the contact position between the first peach-shaped cam (51) and the second peach-shaped cam (52) and the roller rocker arm (61) can be adjusted.

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