A grinding device for diesel engine valve and valve seat

Abstract

The utility model relates to polishing technical field, concretely relates to a kind of grinding device for diesel engine valve and valve seat, including shell, its upper end can support and fix cylinder cover. Shell has the inner chamber of upper end open, inner chamber is installed with carousel, valve stem on cylinder cover is downward and is inserted into the inner chamber of shell and is fixed with carousel. The inner chamber of shell is equipped with cam and driving bevel gear coaxially fixed in same rotating shaft, the axial direction of rotating shaft is perpendicular to the axial direction of valve stem. Spring is installed between carousel and cylinder cover, spring provides the elastic force of far away from cylinder cover to carousel, to stop and resist cam. The lower part of carousel is fixedly provided with driven bevel gear, the axial direction of driven bevel gear is perpendicular to the axial direction of driving bevel gear. Grinding device has first state and second state, in first state, the near rest area of cam and carousel abut, driving bevel gear and driven bevel gear mesh. In second state, the far rest area of cam and carousel abut, driving bevel gear and driven bevel gear disengage.

Description

Technical Field

[0001] This utility model relates to the field of grinding technology, and in particular to a grinding device for diesel engine valves and valve seats. Background Technology

[0002] The valve is installed in the valve seat on the cylinder head of the diesel engine. The valve can be engaged or disengaged from the valve seat during the up and down movement to open and close the valve.

[0003] In the relevant technical solutions, for valve and valve seat grinding machines of large low-speed diesel engines (large marine main engines), most of them fix the valve or valve seat on a special grinding machine, rotate the valve and valve seat electrically or pneumatically, and manually step on the lever to pry the valve rod to drive the valve to move up and down to strike and grind. The contact surface between the valve and valve seat is cleaned and ground by grinding with a grinding wheel or wire brush.

[0004] For the grinding of valves and valve seats in small medium and high speed diesel engines (small marine main engines), the basic method is to manually tap and rotate the valves during the disassembly and maintenance of the diesel engine cylinder head to grind the valve and valve seat sealing surfaces. This is time-consuming, labor-intensive, and inefficient. It is also easy for poor grinding skills to lead to misalignment during grinding, resulting in excessive wear of the valves and valve seats.

[0005] The aforementioned process of manually tapping and rotating the valves for grinding is prone to problems such as poor alignment due to insufficient grinding skills, leading to excessive wear on the valves and seats. Furthermore, manual grinding is time-consuming, labor-intensive, and inefficient, resulting in longer maintenance and repair cycles for diesel engines. Utility Model Content

[0006] This invention provides a grinding device for diesel engine valves and valve seats, which can solve at least one of the above-mentioned technical problems.

[0007] To solve the above-mentioned technical problems, one or more embodiments of this utility model provide a grinding device for diesel engine valves and valve seats, including a housing whose upper end can support and fix a cylinder head. The housing has an open inner cavity at the upper end, in which a turntable is installed. The valve stem on the cylinder head passes downward into the inner cavity of the housing and is fixed to the turntable. The inner cavity of the housing is provided with a cam and a driving bevel gear coaxially fixed to the same rotating shaft, the axis of the rotating shaft being perpendicular to the axis of the valve stem. A spring is installed between the turntable and the cylinder head, the spring providing a spring force to the turntable away from the cylinder head to stop the cam. A driven bevel gear is fixedly sleeved on the lower part of the turntable, the axis of the driven bevel gear being perpendicular to the axis of the driving bevel gear.

[0008] The grinding device has a first state and a second state. In the first state, the near-rest region of the cam abuts against the turntable, and the driving bevel gear and the driven bevel gear mesh. In the second state, the far-rest region of the cam abuts against the turntable, and the driving bevel gear and the driven bevel gear disengage.

[0009] The beneficial effects of one or more of the above technical solutions are as follows: This design uses a motor to simultaneously drive the cam and the driving bevel gear. In the first state, the near-rest area of ​​the cam abuts against the turntable, and the driving and driven bevel gears mesh. In the second state, the far-rest area of ​​the cam abuts against the turntable, and the driving and driven bevel gears disengage. In other words, the process of the valve stem and valve seat rotating to achieve grinding and the process of the valve stem moving up and down to add abrasive oil droplets can be achieved alternately without interfering with each other, facilitating automatic grinding of the valve and valve seat.

[0010] In other words, compared to manual grinding in existing technologies, this solution not only shortens the maintenance time for small diesel engines but also significantly reduces the workload and time of workers. Furthermore, this solution improves the precision, efficiency, and safety of the grinding operation on the valve and valve seat sealing surfaces of diesel engines, thereby reducing the cost of diesel engine maintenance. Attached image description: Figure 1 This is a cross-sectional schematic diagram of the overall structure in an embodiment of this utility model.

[0011] In the diagram, 1. Valve stem; 2. Valve seat; 3. Bolt; 4. Oil sand dropper; 5. Cylinder head; 6. Nut; 7. Pressure cap; 8. Spring; 9. Housing; 10. Roller bearing; 11. Wedge; 12. Rubber block; 13. Turntable; 14. Drive bevel gear; 15. Sealed bearing; 16. Cam; 17. Shaft; 18. Motor; 19. Connecting flange; 20. Foot; 21. Oil plug; 22. Inner cavity; 23. Second cavity. Detailed Implementation

[0012] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0013] See Figure 1 This embodiment provides a grinding device for diesel engine valves and valve seats, including a housing 9, the upper end of which can support and fix a cylinder head 5. The housing 9 has an open inner cavity 22, in which a turntable 13 is installed. The valve stem 1 on the cylinder head 5 passes downward into the inner cavity 22 of the housing 9 and is fixed to the turntable 13. The inner cavity 22 of the housing 9 is provided with a cam 16 and a driving bevel gear 14 coaxially fixed to the same rotating shaft 17, the axis of the rotating shaft 17 being perpendicular to the axis of the valve stem 1. A spring 8 is installed between the turntable 13 and the cylinder head 5, the spring 8 providing a spring force to the turntable 13 away from the cylinder head 5 to stop the cam 16. A driven bevel gear is fixedly sleeved on the lower part of the turntable 13, the axis of the driven bevel gear being perpendicular to the axis of the driving bevel gear 14.

[0014] The grinding device has a first state and a second state. In the first state, the near-rest area of ​​the cam 16 abuts against the turntable 13, and the driving bevel gear 14 and the driven bevel gear are engaged. In the second state, the far-rest area of ​​the cam 16 abuts against the turntable 13, and the driving bevel gear 14 disengages from the driven bevel gear.

[0015] In this embodiment, a pressure cap 7 is provided between the housing 9 and the cylinder head 5. The inner diameter of the pressure cap 7 is smaller than the inner diameter of the inner cavity 22 of the housing 9 and the two are coaxial. One end of the spring 8 is abutted against the pressure cap 7, and the other end is abutted against one end of the bearing. The other end of the bearing is in contact with the upper end surface of the turntable 13.

[0016] Specifically, the bearing at the lower end of the spring 8 is a roller bearing 10. In some embodiments, in order to limit the roller bearing 10 in the horizontal direction, an annular groove can be provided on the upper end face of the turntable 13, and the lower end of the roller bearing 10 is inserted into the annular groove.

[0017] In this embodiment, the upper surface of the turntable 13 is provided with a mounting hole. The inner diameter of the mounting hole is larger than the outer diameter of the valve stem 1. A rubber block 12 is provided in the mounting hole. A wedge block 11 is embedded between the outer ring of the rubber block 12 and the inner wall of the mounting hole. The rubber block 12 can be fixedly sleeved on the lower end of the valve stem 1.

[0018] In this embodiment, a bolt 3 is also included. The bolt 3 is used to pass through the screw holes on the cylinder head 5, the pressure cap 7 and the housing 9 to fix the three together. The upper end of one of the bolts 3 is fixedly sleeved on the support plate. An oil sand dripper 4 is connected to the support plate. The nozzle of the oil sand dripper 4 faces the valve seat 2 on the cylinder head 5.

[0019] Specifically, the bolt 3 here is a long bolt 3, with its upper and lower ends protruding from the upper and lower ends of the cylinder head 5, respectively. Nuts 6 are provided at the upper and lower ends of the long bolt 3 to lock it to the upper and lower end faces of the cylinder head 5.

[0020] In this embodiment, the lower end of the inner cavity 22 of the housing 9 is sealed, and the bottom wall of the housing 9 is provided with an oil plug 21 that communicates with the inner cavity 22.

[0021] It is known that when the lower end of the inner cavity 22 is blocked, it can collect and contain the oil sand liquid flowing down from the valve and valve seat 2 at the upper end of the inner cavity 22. After this part of the liquid is accumulated, it can submerge the lower end of the driving bevel gear 14, thereby realizing the oil lubrication between the driving bevel gear 14 and the driven bevel gear.

[0022] In addition, in order to achieve the alignment of the housing 9 and the cylinder head 5, valve stem 1 and other structures, so that the entire valve stem 1 is in a vertical state, multiple adjustable pads 20 (such as rotatable bolt 3 pad 20 structures) are provided on the lower end face of the housing 9, and the distance between the lower end face of the pads 20 and the lower end face of the housing 9 is adjusted by rotating the pads 20.

[0023] In this embodiment, at least one end of the rotating shaft 17 extends out of the housing 9, and the end of the rotating shaft 17 extending out of the housing 9 is connected to the motor 18.

[0024] Specifically, one end of the rotating shaft 17 is rotatably mounted on one side wall of the housing 9 via a sealed bearing 15, and another sealed bearing 15 is rotatably mounted between the other end of the rotating shaft 17 that extends through the other side wall of the housing 9 and that side wall.

[0025] More specifically, the rotating shaft 17 extends out of the housing 9 and is coaxially fixed to the output shaft of the motor 18 via a connecting flange 19. The motor 18 is fixed by a bracket supported by the ground or a workbench. Specifically, the motor here is a pneumatic or electric variable speed motor.

[0026] In this embodiment, the inner cavity 22 includes a first cavity and a second cavity 23 disposed above the first cavity. The first cavity is used to accommodate the rotating shaft 17, the cam 16 and the driving bevel gear 14, and the second cavity 23 is used to accommodate the turntable 13 and the spring 8.

[0027] Specifically, the cross-sections of the first cavity and the second cavity 23 are both circular, and the first cavity and the second cavity 23 are two cavity structures arranged coaxially.

[0028] In this embodiment, the lower end of the turntable 13 has a stop rod, which is coaxially arranged with the turntable 13, and the outer diameter of the stop rod is smaller than the inner diameter of the driven bevel gear.

[0029] Working principle: First, place the cleaned cylinder head 5 of the diesel engine on the workbench, and install the valves and valve seats 2, after removing carbon deposits, into the cylinder head 5 of the diesel engine. Second, fit the pressure cap 7, spring 8, and bearing onto the valve stem 1 of the valve to install it in the cylinder head 5 of the diesel engine.

[0030] The third step is to remove the turntable 13 from the grinding device and install it on the valve stem 1. Select a rubber block 12 of appropriate size and model (matching the valve model, with different models available) and a wedge block 11 for fixing (matching the rubber block 12) and fix them on the valve stem 1.

[0031] The fourth step is to install the cylinder head 5 and turntable 13 with the valves fixed into the housing 9 of the grinding device. The cylinder head 5 and housing 9 are fixed by bolts 3 and nuts 6. Note that the base circle (i.e., the near rest section) of the cam 16 is located at the top, and the driving bevel gear 14 and the driven bevel gear are in a meshing state.

[0032] Fifth step: Adjust the grinding device to a level position by using the foot 20. Connect the motor 18 to the shaft 17 of the cam 16 via the connecting flange 19. Install the oil sand dripper 4 containing suitable grinding oil sand on the upper end of one of the bolts 3 and open the valve of the oil sand dripper 4. During operation, the grinding oil sand drips into the valve and valve seat 2.

[0033] Step 6: Following the diesel engine manufacturer's instructions for maintaining and repairing the valves and valve seats 2, start the motor 18 at an appropriate speed. The spring 8 remains compressed, causing the lower end of the turntable 13 to press against the cam 16 with moderate pressure. When the cam 16 is at its upper apex (the apex of the far-end section), the valve rises to its highest position, and the driving bevel gear 14 disengages from the driven bevel gear. When the cam 16 is at its base circle (near the end section), the valve contacts the sealing surface of the valve seat 2, and the driving bevel gear 14 meshes with the driven bevel gear. The rotation of the shaft 17 drives the turntable 13 to rotate, causing the valve and valve seat 2 sealing surfaces to rotate relative to each other for grinding.

[0034] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0035] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A grinding device for diesel engine valves and valve seats, characterized in that, The device includes a housing with its upper end capable of supporting and fixing a cylinder head; the housing has an open inner cavity with a turntable installed in the inner cavity, and the valve stem on the cylinder head passes downward into the inner cavity of the housing and is fixed to the turntable; The inner cavity of the housing is provided with a cam and a driving bevel gear coaxially fixed to the same rotating shaft, the axis of the rotating shaft being perpendicular to the axis of the valve stem; a spring is installed between the turntable and the cylinder head, the spring providing elastic force to the turntable away from the cylinder head to stop the cam; a driven bevel gear is fixedly sleeved on the lower part of the turntable, the axis of the driven bevel gear being perpendicular to the axis of the driving bevel gear. The grinding device has a first state and a second state. In the first state, the near rest area of ​​the cam abuts against the turntable, and the driving bevel gear and the driven bevel gear mesh. In the second state, the far rest area of ​​the cam abuts against the turntable, and the driving bevel gear and the driven bevel gear disengage.

2. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, A pressure cap is provided between the housing and the cylinder head. The inner diameter of the pressure cap is smaller than the inner diameter of the housing cavity and the two are coaxial. One end of the spring abuts against the pressure cap, and the other end abuts against one end of the bearing. The other end of the bearing is in contact with the upper end face of the turntable.

3. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, The upper surface of the turntable is provided with a mounting hole. The inner diameter of the mounting hole is larger than the outer diameter of the valve stem. A rubber block is provided in the mounting hole. A wedge is embedded between the outer ring of the rubber block and the inner wall of the mounting hole. The rubber block can be fixedly sleeved on the lower end of the valve stem.

4. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, It also includes bolts for passing through threaded holes in the cylinder head, gland and housing to secure the three together; the upper end of one of the bolts is fixedly fitted to a support plate on which an oil sander is connected, the nozzle of the oil sander facing the valve seat on the cylinder head.

5. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, The lower end of the inner cavity of the housing is sealed, and the bottom wall of the housing is provided with an oil plug that communicates with the inner cavity.

6. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, At least one end of the rotating shaft extends out of the housing, and the end of the rotating shaft extending out of the housing is connected to the motor.

7. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, The inner cavity includes a first cavity and a second cavity located above the first cavity. The first cavity is used to accommodate the rotating shaft, cam, and drive bevel gear, and the second cavity is used to accommodate the turntable and spring.

8. The grinding apparatus for diesel engine valves and valve seats according to claim 1, characterized in that, The lower end of the turntable has a stop rod, which is coaxially arranged with the turntable, and the outer diameter of the stop rod is smaller than the inner diameter of the driven bevel gear.

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