Adjusting structure of engine valve clearance
By adopting the axial sliding structure of the rocker arm on the rocker arm shaft and the limit block fixing method in the motorcycle engine, the problem of low selection efficiency of valve adjustment gaskets in the prior art is solved, and the cylinder head assembly efficiency is improved.
Patent Information
- Application Number
- CN202420857977.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-23
AI Technical Summary
In the prior art, when selecting valve adjustment gaskets, the assembled rocker and rocker shaft need to be removed, resulting in inefficient assembly.
The axial sliding structure of the rocker arm on the rocker arm shaft is adopted, so that the rocker arm can be dislocated left and right with the intake and exhaust valve, which facilitates the replacement and measurement of valve adjustment gaskets, and the rocker arm is axially fixed through the limit block.
It effectively improves the assembly efficiency of the cylinder head, simplifies the valve clearance adjustment process, and reduces costs.
Smart Images
Figure CN222650048U_ABST
Abstract
Description
Technical field:
[0001] The utility model belongs to the technical field of engines, in particular to an adjustment structure for engine valve clearance. Background technology:
[0002] In the assembly structure of a motorcycle engine, the cylinder head needs to be equipped with camshafts, rocker shafts, rocker arms, intake valves, exhaust valves and other parts. Among them, the valve clearance between the rocker arm and the intake valve and exhaust valve needs to be adjusted with valve adjusting gaskets. That is, by selecting valve adjusting gaskets of appropriate thickness, the rocker arm and the intake valve or exhaust valve maintain an effective valve clearance, ensuring that the intake valve and exhaust valve can accurately and stably perform opening and closing actions when the engine is operating normally.
[0003] However, when selecting valve adjustment gaskets, the adjustment gaskets are first installed on the intake and exhaust valves, and then the rocker arms and rocker arm shafts are assembled, and finally the valve clearance is measured. If the valve clearance is not appropriate, the assembled rocker arms and rocker arm shafts need to be removed, and the valve adjustment gaskets need to be re-selected, which is inefficient. Summary of the invention:
[0004] The purpose of the utility model is to provide an adjustment structure for the valve clearance of an engine, which adopts a structure in which a rocker arm slides axially on a rocker arm shaft, so that the rocker arm can be misaligned left and right with the corresponding intake and exhaust valves, so as to facilitate the replacement and measurement of the valve adjustment gasket, and after the valve adjustment gasket is selected and matched, the rocker arm is axially fixed with the help of a limit block, thereby effectively improving the assembly efficiency of the cylinder head.
[0005] The utility model is achieved in this way:
[0006] The adjustment structure of the engine valve clearance includes a cylinder head and an intake and exhaust valve arranged on the cylinder head. The cylinder head is equipped with a rocker shaft. A rocker arm whose outer end cooperates with the intake and exhaust valves is rotatably connected to the rocker shaft. The rocker shaft is provided with an axial sliding stroke along its axial direction. The rocker arm slides on the axial sliding stroke, and the rocker arm slides along the axial sliding stroke and can be misaligned with the corresponding intake and exhaust valves to the left and right. A detachable limit block is provided on the axial sliding stroke, and a limit space for axially fixing the rocker arm is formed between the limit block and the axial sliding stroke.
[0007] In the above-mentioned engine valve clearance adjustment structure, an assembly through hole is provided on the limit block, and an assembly screw hole corresponding to the position of the assembly through hole is provided on the rocker arm shaft located on the axial sliding stroke, and the tail end of the fastening screw passes through the assembly through hole and is screwed on the assembly screw hole to realize a detachable connection between the limit block and the rocker arm shaft.
[0008] In the above-mentioned engine valve clearance adjustment structure, the corresponding end surface of the limit block is provided with an arc-shaped opening groove that fits on the outer wall surface of the rocker arm shaft, and the arc surface angle of the arc-shaped opening groove is less than or equal to 90°.
[0009] In the above-mentioned engine valve clearance adjustment structure, two bearing seats are arranged at intervals on the left and right sides of the cylinder head, the two ends of the rocker arm shaft are respectively connected to the two bearing seats, and the rocker arm shaft located between the two bearing seats forms the axial sliding stroke, and the limit space is formed between the limit block and one of the bearing seats.
[0010] The outstanding advantages of the utility model compared with the prior art are:
[0011] The utility model has the advantages of simple structure, reasonable design and low cost, and adopts the structure of axial sliding of the rocker arm on the rocker arm shaft, so that the rocker arm can be misaligned with the corresponding intake and exhaust valves to facilitate the replacement and measurement of the valve adjustment gasket, and after the valve adjustment gasket is selected and matched, the rocker arm is axially fixed with the help of a limit block, which effectively improves the assembly efficiency of the cylinder head. Description of the drawings:
[0012] Figure 1 It is an overall stereogram of the utility model;
[0013] Figure 2 It is an exploded view of the limit block and the overall structure of the utility model.
[0014] In the figure: 1. Cylinder head; 2. Inlet and exhaust valves; 3. Rocker arm shaft; 4. Rocker arm; 5. Limit block; 6. Assembly through hole; 7. Assembly screw hole; 8. Fastening screw; 9. Bearing seat. Specific implementation method:
[0015] The present invention is further described below with reference to specific embodiments. Figure 1 —2:
[0016] The adjustment structure of the engine valve clearance includes a cylinder head 1 and an intake and exhaust valve 2 arranged on the cylinder head 1. The cylinder head 1 is equipped with a rocker shaft 3. The rocker shaft 3 is rotatably connected to a rocker arm 4 whose outer end cooperates with the intake and exhaust valve 2. The rocker shaft 3 is provided with an axial sliding stroke along its axial direction. The rocker arm 4 is slidably matched on the axial sliding stroke, and the rocker arm 4 slides along the axial sliding stroke and can be misaligned with the corresponding intake and exhaust valve 2 to the left and right. A detachable limit block 5 is provided on the axial sliding stroke, and a limit space for axially fixing the rocker arm 4 is formed between the limit block 5 and the axial sliding stroke.
[0017] The utility model has a simple structure, reasonable design and low cost. It adopts a structure in which the rocker arm 4 slides axially on the rocker arm shaft 3, so that the rocker arm 4 can be misaligned with the corresponding intake and exhaust valves 2 to the left and right, so as to facilitate the replacement and measurement of the valve adjustment gasket. After the valve adjustment gasket is selected and matched, the rocker arm 4 is axially fixed with the help of the limit block 5, which effectively improves the assembly efficiency of the cylinder head 1.
[0018] Furthermore, the limit block 5 can be detachably connected to the cylinder head 1, and can also be detachably matched with the rocker shaft 3. In the present embodiment, the specific detachable manner of the limit block 5 is as follows: an assembly through hole 6 is provided on the limit block 5, and an assembly screw hole 7 corresponding to the position of the assembly through hole 6 is provided on the rocker shaft 3 located on the axial sliding stroke, and the tail end of the fastening screw 8 passes through the assembly through hole 6 and is screwed on the assembly screw hole 7 to realize the detachable connection between the limit block 5 and the rocker shaft 3.
[0019] At the same time, in order to improve the assembly stability between the limit block 5 and the rocker arm shaft 3, the corresponding end face of the limit block 5 is provided with an arc-shaped opening groove that fits on the outer wall of the rocker arm shaft 3, and the arc angle of the arc-shaped opening groove is less than or equal to 90°.
[0020] In addition, the axial sliding stroke can be a one-way limiting structure formed by one side wall of the cylinder head 1 and the rocker shaft 3. In the present embodiment, two bearing seats 9 are arranged at intervals on the left and right sides of the cylinder head 1, and the two ends of the rocker shaft 3 are respectively connected to the two bearing seats 9, and the rocker shaft 3 located between the two bearing seats 9 forms the axial sliding stroke, and the limiting space is formed between the limiting block 5 and one of the bearing seats 9.
[0021] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.
Claims
1. An adjustment structure for engine valve clearance, comprising a cylinder head (1), and an intake and exhaust valve (2) arranged on the cylinder head (1), a rocker arm shaft (3) being mounted on the cylinder head (1), and a rocker arm (4) whose outer end cooperates with the intake and exhaust valve (2) being rotatably connected to the rocker arm shaft (3), characterized in that: The rocker arm shaft (3) is provided with an axial sliding stroke along its axial direction, the rocker arm (4) is slidably fitted on the axial sliding stroke, and the rocker arm (4) slides along the axial sliding stroke and can be displaced left and right with the corresponding intake and exhaust valve (2), a detachable limit block (5) is provided on the axial sliding stroke, and a limit space for axially fixing the rocker arm (4) is formed between the limit block (5) and the axial sliding stroke.
2. The engine valve clearance adjustment structure according to claim 1, characterized in that: The limit block (5) is provided with an assembly through hole (6), and the rocker arm shaft (3) located on the axial sliding stroke is provided with an assembly screw hole (7) corresponding to the position of the assembly through hole (6), and the tail end of the fastening screw (8) passes through the assembly through hole (6) and is screwed on the assembly screw hole (7) to achieve a detachable connection between the limit block (5) and the rocker arm shaft (3).
3. The engine valve clearance adjustment structure according to claim 1 or 2, characterized in that: The corresponding end surface of the limit block (5) is provided with an arc-shaped opening groove which fits on the outer wall surface of the rocker arm shaft (3), and the arc surface angle of the arc-shaped opening groove is less than or equal to 90°.
4. The engine valve clearance adjustment structure according to claim 1, characterized in that: The cylinder head (1) is provided with two bearing seats (9) spaced apart on the left and right sides, the two ends of the rocker arm shaft (3) are respectively connected to the two bearing seats (9), and the rocker arm shaft (3) located between the two bearing seats (9) forms the axial sliding stroke, and the limiting space is formed between the limiting block (5) and one of the bearing seats (9).