Valve roller tappet guide device of marine large methanol engine

Abstract

The utility model discloses a marine large methanol engine valve roller tappet guiding device which comprises a transverse moving mechanism and two transverse moving locking mechanisms, the transverse moving mechanism comprises two inverted L-shaped sliding blocks and four compression springs, and the inner side faces of the long sides of the two inverted L-shaped sliding blocks abut against each other and are overlapped up and down. The transverse movement locking mechanism comprises an inner hexagonal head screw rod, two wedge-shaped sliding blocks, two wedge-shaped top blocks and two wedge-shaped sliding block reset compression springs, the wedge-shaped sliding blocks abut against the inclined faces of the wedge-shaped top blocks respectively, and the middle of the inner hexagonal head screw rod is in threaded connection with the wedge-shaped sliding blocks in the long sides of the L-shaped sliding blocks respectively. According to the utility model, the gap is convenient to check and adjust, the installation and maintenance cost is reduced, and the installation and maintenance efficiency of the marine large methanol engine is obviously improved.

Description

Technical Field

[0001] The utility model relates to a valve distribution system of a new energy engine, in particular to a guide device for a valve tappet of a large marine methanol engine with a cylinder diameter of ≥160mm, belonging to the technical field of new energy engines. Background Art

[0002] The International Maritime Organization has increasingly stringent requirements for ship pollutant emission limits, and the use of marine methanol engines using green fuel is becoming more and more widespread. When a marine methanol engine is running, the valve reciprocates and opens and closes under the action of the engine's intake and exhaust camshafts to achieve the engine's intake work and exhaust gas discharge. When the intake and exhaust cams rotate to the raised position, the roller tappet is driven to move straight upward, and the roller tappet then transmits force to the valve through the ball head, tappet, and rocker arm, pushing the valve to open until the maximum opening angle. When the roller of the tappet rolls down from the maximum lift of the camshaft, the valve begins to close under the action of the valve spring until the roller rests against the camshaft base circle. The valve is completely closed, and the reciprocating motion ensures the normal operation of the engine. During this reciprocating motion, the fixation, guidance, and movement accuracy of the roller tappet are crucial.

[0003] In order to ensure that the roller and the cam have a high centering accuracy, the guide mechanism of the roller tappet of most marine methanol engines currently adopts a convex guide strip machined on the side of the roller tappet, and a guide groove machined in the cylinder head cooling water jacket tappet mounting hole that matches the tappet to match it, and the clearance after installation is controlled between 0.1 and 0.2 mm. On the one hand, this structure is complicated to process. On the other hand, the wear of the marine methanol engine becomes increasingly serious after long-term operation, and the matching clearance between the convex guide strip and the guide groove increases, resulting in abnormal noise and instability in the operation of the marine methanol engine, and parts need to be repaired or replaced, thereby increasing the cost of using the marine methanol engine. In addition, the guide clearance between the convex guide strip and the guide groove needs to be checked during regular maintenance of the marine methanol engine. Since the matching clearance between the concave and convex surface of the convex guide strip and the guide groove is in the cooling water jacket roller tappet mounting hole, it is difficult to check, which seriously affects the operation quality of the marine methanol engine. Utility Model Content

[0004] The utility model aims to provide a valve roller tappet guide device for a large-scale marine methanol engine which is convenient for inspection and maintenance, so as to improve the running quality of the large-scale marine methanol engine.

[0005] The utility model is realized through the following technical solutions:

[0006] A valve roller tappet guide device for a large marine methanol engine, comprising a transverse movement mechanism and two sets of transverse movement locking mechanisms;

[0007] The transverse movement mechanism includes two inverted L-shaped sliders and four compression springs. The inner side surfaces of the long sides of the two inverted L-shaped sliders are stacked up and down, and the end of the long side of one inverted L-shaped slider is adjacent to the inner side surface of the short side of the other inverted L-shaped slider with a gap of D=3-5mm. The compression springs in a group of two are arranged perpendicular to the longitudinal direction of the inverted L-shaped sliders, and one end of the compression springs extends into the compression spring support countersunk holes located at the end of the long side of the inverted L-shaped slider, and the other end of the compression springs rests on the inner side surface of the short side of the other inverted L-shaped slider.

[0008] The transverse movement locking mechanisms are respectively arranged in the long sides of the inverted L-shaped slider, including a hexagonal screw, two wedge-shaped sliders, two wedge-shaped top blocks and two wedge-shaped slider reset compression springs. The longitudinal ends of the inner side surfaces of the long sides of the inverted L-shaped slider are respectively provided with longitudinal rectangular grooves, one end of the transverse rectangular groove is respectively vertically connected to the middle of the longitudinal rectangular groove, and the other end of the transverse rectangular groove is respectively communicated with one end of the waist-shaped through hole that crosses the long side of the inverted L-shaped slider; the wedge sliders are respectively embedded in one end of the longitudinal rectangular groove, the wedge-shaped top blocks are respectively embedded in the transverse rectangular groove, and the inclined surfaces of the wedge sliders are respectively against the inclined surfaces of the corresponding wedge-shaped top blocks; one end of the hexagonal screw passes through the two longitudinal rectangular grooves in sequence along the longitudinal direction of the long side of the inverted L-shaped slider. The middle part of the hexagon socket screw is respectively connected with the wedge-shaped slider through a thread, and one end of the hexagon socket screw is positioned in the countersunk hole at one end of the long side of the inverted L-shaped slider through an elastic retaining ring on the shaft, and the hexagonal head of the other end of the hexagon socket screw is supported in the hexagonal head countersunk hole at the other end of the long side of the inverted L-shaped slider; the wedge-shaped slider reset compression spring is respectively sleeved on the hexagon socket screw extending into the longitudinal rectangular sink groove, and the two ends of the wedge-shaped slider reset compression spring are respectively located between the small end plane of the wedge-shaped slider and an inner end surface of the longitudinal rectangular sink groove; one end of the special hexagon socket screw is respectively passed through the waist-shaped through hole from bottom to top and then screwed into the lower end of the cylinder head cooling water jacket, and the two upper and lower overlapping inverted L-shaped sliders are located between the intake cam tappet and the exhaust cam tappet.

[0009] The purpose of the utility model can be further achieved by the following technical measures.

[0010] Furthermore, the inclined angle α of the inclined surface of the wedge-shaped sliding block is equal to the inclined angle β of the inclined surface of the opposing wedge-shaped top block, and α=β≤30°.

[0011] Furthermore, the thickness of the wedge-shaped slider is equal to that of the wedge-shaped top block, the depth of the longitudinal rectangular groove is equal to that of the transverse rectangular groove, and the difference between the depth H1 of the longitudinal rectangular groove and the thickness H2 of the wedge-shaped slider or the thickness H3 of the wedge-shaped top block is: H1-H2(H3)=0.4-0.6mm.

[0012] Furthermore, the adjacent surface of the wedge-shaped top block and the special hexagon socket screw is a concave arc surface, and the arc radius of the concave arc surface matches the smooth rod radius of the special hexagon socket screw; the ratio of the smooth rod length L1 to the sum of the thickness of the wedge-shaped slider H2 and the thickness of the wedge-shaped top block H3 is L1 / H2+H3=1.2~1.4.

[0013] The utility model adopts two inverted L-shaped sliders whose inner side surfaces of the long sides are against each other and overlapped up and down, and the two inverted L-shaped sliders are relatively moved by a transverse mechanism to adjust the required guide clearance; the utility model is installed at the bottom of the cylinder head cooling water jacket and is located between the intake and exhaust roller tappets. The locking mechanism increases the fitting area between the inwardly moved wedge-shaped slider and the inclined surface of the wedge-shaped top block, and the concave arc surface of the wedge-shaped top block respectively abuts against the corresponding special hexagon socket screws, thereby locking the transverse position of the two inverted L-shaped sliders respectively, and the setting of the guide clearance can be completed by inserting a 0.1mm thick gauge. During the regular maintenance and inspection of large marine methanol engines, it is only necessary to use a gauge to check the guide clearance of the fitting surface, and the guide clearance can be readjusted. The utility model is very convenient to install and check the adjustment clearance, and the guide clearance can be compensated and adjusted without replacing the device of the utility model, which reduces the installation and maintenance costs and significantly improves the installation and maintenance efficiency of large marine methanol engines.

[0014] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the utility model;

[0016] Figure 2 yes Figure 1 AA step cross-sectional view, at this time, the wedge-shaped slider is in the initial state where the wedge-shaped slider and the inclined surface of the wedge-shaped top block are against each other;

[0017] Figure 3 yes Figure 1 AA step section view, at this time, the wedge-shaped slider is in a locked state with the inclined surface of the wedge-shaped top block completely against each other;

[0018] Figure 4 yes Figure 1 BB cross-sectional view, at this time, the wedge-shaped slider is in a locked state with the inclined surface of the wedge-shaped top block completely against each other;

[0019] Figure 5 yes Figure 3 CC section view;

[0020] Figure 6 yes Figure 5 DD cross-sectional view;

[0021] Figure 7 The utility model is a partial view of a device installed at the lower end of a cylinder head cooling water jacket of a large marine methanol engine. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 to Figure 6 As shown, the valve roller tappet guide device of a large marine methanol engine of this embodiment includes a transverse movement mechanism 1 and two sets of transverse movement locking mechanisms 2.

[0024] The transverse movement mechanism 1 includes two inverted L-shaped sliders 11 and four compression springs 12. The inner side surfaces of the long sides 111 of the two inverted L-shaped sliders are stacked up and down, and the end of the long side 111 of one inverted L-shaped slider is adjacent to the inner side surface of the short side 112 of the other inverted L-shaped slider with a gap of D=4mm, so as to facilitate the adjustment of the position of the inverted L-shaped slider 11. The compression springs 12 in a group of two are arranged vertically and spaced apart from each other in the longitudinal direction of the inverted L-shaped slider 11. One end of the compression spring 12 extends into the compression spring support countersunk hole 113 located at the end of the long side of the inverted L-shaped slider, and the other end of the compression spring rests on the inner side surface of the short side 112 of the other inverted L-shaped slider.

[0025] The transverse locking mechanism 2 is respectively arranged in the long side 111 of the inverted L-shaped slider, including a hexagonal screw rod 21, two wedge-shaped sliders 22, two wedge-shaped top blocks 23 and two wedge-shaped slider return compression springs 24. The longitudinal ends of the inner side surface of the long side 112 of the inverted L-shaped slider are respectively provided with longitudinal rectangular grooves 114, one end of the transverse rectangular groove 115 is respectively vertically connected to the middle part of the longitudinal rectangular groove 114, and the other end of the transverse rectangular groove 115 is respectively communicated with one end of a waist-shaped through hole 116 that crosses the long side 112 of the inverted L-shaped slider.

[0026] The wedge-shaped sliders 22 are respectively embedded in one end of the longitudinal rectangular grooves 114, and the wedge-shaped top blocks 23 are respectively embedded in the transverse rectangular grooves 115, and the inclined surfaces of the wedge-shaped sliders 22 are respectively against the inclined surfaces of the corresponding wedge-shaped top blocks 23. One end of the hexagonal screw 21 passes through the two longitudinal rectangular grooves 114 in sequence along the long side 111 of the inverted L-shaped slider, and the middle of the hexagonal screw 21 is respectively threadedly connected with the wedge-shaped slider 22. The end of the hexagonal screw 21 is positioned and supported in the countersunk hole 117 at one end of the long side 112 of the inverted L-shaped slider through the shaft elastic retaining ring 25, and the hexagonal head 211 at the other end of the hexagonal screw 21 is supported in the hexagonal head countersunk hole 118 at the other end of the long side 112 of the inverted L-shaped slider. The wedge-shaped slider reset spring 24 is respectively sleeved on the hexagonal screw 21 extending into the longitudinal rectangular groove 114, and the two ends of the wedge-shaped slider reset spring 24 are respectively located at the small end plane 221 of the wedge-shaped slider and the Figure 2 Between the lower inner end surfaces 1141 of the longitudinal rectangular sink shown.

[0027] like Figure 4 and Figure 7 As shown, one end of the special hexagon socket screw 3 passes through the waist-shaped through hole 116 from bottom to top and is screwed into the lower end of the cylinder head cooling water jacket 10, and the two inverted L-shaped sliders 1 overlapped up and down are located between the intake cam tappet 20 and the exhaust cam tappet 30.

[0028] like Figure 4 As shown, the angle α of the inclined surface of the wedge slider is equal to the angle β of the inclined surface of the wedge top block, and α=β≤30°. Since the horizontal component of the normal force generated when the small angle inclined surfaces of the wedge slider 22 and the wedge top block 23 are pressed against each other is much greater than the vertical component, the inverted L-shaped slider 1 is reliably locked in the desired position. The thickness of the wedge slider 22 and the wedge top block 23 are equal, the depth of the longitudinal rectangular groove 114 is equal to the depth of the transverse rectangular groove 115, and the difference between the depth H1 of the longitudinal rectangular groove and the thickness H2 of the wedge slider or the thickness H3 of the wedge top block is: H1-H2(H3)=0.5mm. When the inner side surfaces of the long sides 111 of the two inverted L-shaped sliders are superimposed against each other, the relative movement of the two inverted L-shaped sliders 11 in the corresponding longitudinal rectangular groove 114 and transverse rectangular groove 115 is facilitated.

[0029] The adjacent surface of the wedge-shaped top block 23 and the special hexagon socket screw 3 is a concave arc surface 231, and the arc radius of the concave arc surface 231 matches the radius of the polished rod 31 of the special hexagon socket screw 3. Figure 5 As shown, the ratio of the length of the polished rod L1 to the sum of the thickness of the wedge-shaped slider H2 and the thickness of the wedge-shaped top block H3 is L1 / H1+H2=1.3, so that the concave arc surfaces 231 of the upper and lower wedge-shaped top blocks 23 can fit with the adjacent surfaces of the special hexagon socket screws 3, and the inverted L-shaped slider 1 can be locked by the abutting wedge-shaped sliders 22 and wedge-shaped top blocks 23. The center distance of the waist-shaped through hole 116 is E=4mm.

[0030] The installation and adjustment process of the utility model is as follows:

[0031] 1) If Figure 2 As shown, the wedge-shaped slider 22 is respectively inserted into one end of the longitudinal rectangular groove 114 of the long side 111 of the inverted L-shaped slider, and the wedge-shaped top block 23 is respectively inserted into the transverse rectangular groove 115 of the long side 111 of the inverted L-shaped slider. The large end plane 222 of the wedge-shaped slider is respectively against the end surface of one end of the longitudinal rectangular groove 114, and the inclined surface of the wedge-shaped slider is respectively against the corresponding inclined surface part of the wedge-shaped top block. Then, the wedge-shaped slider reset compression spring 24 is respectively inserted into the longitudinal rectangular groove 114, and the two ends of the wedge-shaped slider reset compression spring 24 are respectively located at the small end plane 221 of the wedge-shaped slider and Figure 2 to Figure 4 Between the other end surface 1141 of the lower part of the longitudinal rectangular sink shown.

[0032] Then, one end of the hexagonal screw rod 21 passes through the wedge-shaped slider reset compression springs 24 in the two longitudinal rectangular grooves 114 in sequence along the long side 111 of the inverted L-shaped slider. The middle part of the hexagonal screw rod 21 is threadedly connected with the wedge-shaped slider 22 respectively. One end of the hexagonal screw rod 21 is positioned in the countersunk hole 117 at one end of the long side 111 of the inverted L-shaped slider through the shaft elastic retaining ring 25. At this time, under the action of the elastic force of the wedge-shaped slider reset compression spring 24, the hexagonal head 211 at the other end of the hexagonal screw rod 21 abuts against the bottom surface of the hexagonal head countersunk hole 118 at the other end of the long side 111 of the inverted L-shaped slider, eliminating the thread gap between the hexagonal screw rod 21 and the threaded hole of the wedge-shaped slider 22, thereby improving the position accuracy of locking the inverted L-shaped slider 11.

[0033] Next, place one end of the compression spring 12 into the compression spring support countersunk hole 113 at the end of the long side 111 of the inverted L-shaped slider, and then overlap the inner side surfaces of the long sides 111 of the two inverted L-shaped sliders up and down, leaving a gap of D=4mm between the end of the long side 111 of one inverted L-shaped slider and the inner side surface of the short side 112 of the other inverted L-shaped slider, and the other end of the compression spring 12 rests on the inner side surface of the short side 112 of the other inverted L-shaped slider.

[0034] 2) If Figure 1 and Figure 7 As shown, pinch the outer side surfaces of the upper and lower inverted L-shaped sliders 11, and the four compression springs 12 are all compressed. After aligning the waist-shaped through holes 116 of the upper and lower inverted L-shaped sliders 11, one end of the special hexagon socket screw 3 is passed through the waist-shaped through holes 116 from bottom to top and then screwed into the lower end of the cylinder head cooling water jacket 10. The inverted L-shaped slider is located between the intake cam tappet 20 and the exhaust cam tappet 30, and the installation of the transverse movement mechanism 1 and the transverse movement locking mechanism 2 is completed.

[0035] 3) Use an Allen wrench to loosen the special Allen screws 3 respectively, and the upper and lower inverted L-shaped sliders 11 move outward respectively under the elastic force of their two compression springs 12, so that the outer planes of the short sides 112 of the upper and lower inverted L-shaped sliders 11 at both ends are completely fitted with the adjacent intake roller tappet guide plane 201 or exhaust roller tappet guide plane 301.

[0036] 4) Use a 0.1mm thick feeler gauge to insert between the outer plane of the short side 112 of the inverted L-shaped slider and the intake guide flat roller tappet guide plane 201, or between the exhaust guide flat roller tappet guide plane 301, and then use an hexagonal wrench to tighten the special hexagonal screws 3 respectively.

[0037] 5) Use the corresponding specification of the hexagon wrench to rotate the hexagon screw 21 clockwise, and the wedge slider 22 moves toward the wedge slider reset spring 24, and the wedge slider reset spring 24 is compressed. The inclined surface of the wedge slider 22 and the inclined surface of the wedge top block 23 are completely fitted, pushing the wedge top block 23 to move toward the corresponding special hexagon socket screw 3, until the concave arc surface 231 of the wedge top block 23 abuts against the corresponding special hexagon socket screw 3, thereby locking the relative position of the inverted L-shaped slider 11 and the special hexagon socket screw 3. Finally, pull out the 0.1mm thick feeler gauge to complete the clearance adjustment between the upper and lower inverted L-shaped sliders 11 and the adjacent intake guide flat roller tappet guide plane 201, or between the upper and lower inverted L-shaped sliders 11 and the adjacent intake guide flat roller tappet guide plane 301.

[0038] like Figure 2 As shown, in process 1), the ratio of the width E1 of the inclined surface of the wedge slider 22 and the corresponding inclined surface of the wedge top block 23 to the width E of the wedge top block is: E1 / E=0.4, so that the contact area between the inclined surface of the wedge slider 22 and the corresponding wedge top block 23 in the initial state reaches 40% of the inclined surface area, thereby improving the movement accuracy of the wedge slider 22.

[0039] In addition to the above-mentioned embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A valve roller tappet guide device for a large marine methanol engine, characterized in that: Including transverse movement mechanism and 2 sets of transverse movement locking mechanisms; The transverse movement mechanism includes two inverted L-shaped sliders and four compression springs. The inner side surfaces of the long sides of the two inverted L-shaped sliders are stacked up and down, and the end of the long side of one inverted L-shaped slider is adjacent to the inner side surface of the short side of the other inverted L-shaped slider with a gap of D=3-5mm. The compression springs in a group of two are arranged perpendicular to the longitudinal direction of the inverted L-shaped sliders, and one end of the compression springs extends into the compression spring support countersunk holes located at the end of the long side of the inverted L-shaped slider, and the other end of the compression springs rests on the inner side surface of the short side of the other inverted L-shaped slider. The transverse movement locking mechanisms are respectively arranged in the long sides of the inverted L-shaped slider, including a hexagonal screw, two wedge-shaped sliders, two wedge-shaped top blocks and two wedge-shaped slider reset compression springs. The longitudinal ends of the inner side surfaces of the long sides of the inverted L-shaped slider are respectively provided with longitudinal rectangular grooves, one end of the transverse rectangular groove is respectively vertically connected to the middle of the longitudinal rectangular groove, and the other end of the transverse rectangular groove is respectively communicated with one end of the waist-shaped through hole that crosses the long side of the inverted L-shaped slider; the wedge sliders are respectively embedded in one end of the longitudinal rectangular groove, the wedge-shaped top blocks are respectively embedded in the transverse rectangular groove, and the inclined surfaces of the wedge sliders are respectively against the inclined surfaces of the corresponding wedge-shaped top blocks; one end of the hexagonal screw passes through the two longitudinal rectangular grooves in sequence along the longitudinal direction of the long side of the inverted L-shaped slider. The middle part of the hexagon socket screw is respectively connected with the wedge-shaped slider through a thread, and one end of the hexagon socket screw is positioned in the countersunk hole at one end of the long side of the inverted L-shaped slider through an elastic retaining ring on the shaft, and the hexagonal head of the other end of the hexagon socket screw is supported in the hexagonal head countersunk hole at the other end of the long side of the inverted L-shaped slider; the wedge-shaped slider reset compression spring is respectively sleeved on the hexagon socket screw extending into the longitudinal rectangular sink groove, and the two ends of the wedge-shaped slider reset compression spring are respectively located between the small end plane of the wedge-shaped slider and an inner end surface of the longitudinal rectangular sink groove; one end of the special hexagon socket screw is respectively passed through the waist-shaped through hole from bottom to top and then screwed into the lower end of the cylinder head cooling water jacket, and the two upper and lower overlapping inverted L-shaped sliders are located between the intake cam tappet and the exhaust cam tappet.

2. The valve roller tappet guide device for a large methanol engine for a ship as claimed in claim 1, characterized in that: The inclined angle α of the inclined surface of the wedge-shaped sliding block is equal to the inclined angle β of the inclined surface of the opposing wedge-shaped top block, and α=β≤30°.

3. The valve roller tappet guide device for a large marine methanol engine as claimed in claim 1, characterized in that: The thickness of the wedge-shaped slider is equal to that of the wedge-shaped top block, the depth of the longitudinal rectangular groove is equal to that of the transverse rectangular groove, and the difference between the depth H1 of the longitudinal rectangular groove and the thickness H2 of the wedge-shaped slider or the thickness H3 of the wedge-shaped top block is: H1-H2(H3)=0.4-0.6mm.

4. The valve roller tappet guide device for a large-scale methanol engine for a ship as claimed in claim 1, characterized in that: The adjacent surface of the wedge-shaped top block and the special hexagon socket screw is a concave arc surface, and the arc radius of the concave arc surface matches the polished rod radius of the special hexagon socket screw; the ratio of the polished rod length L1 to the sum of the thickness of the wedge-shaped slider H2 and the thickness of the wedge-shaped top block H3 is L1 / H2+H3=1.2~1.4.

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