JPS58128408A - Four-cycle diesel engine - Google Patents

Abstract

PURPOSE:To reduce the weight of an operating mechanism of suction and exhaust valves by providing a working arm is engaged with a working arm drive part formed on a crankshaft to make coincident motion with the crankshaft, pivotally mounting said arm to an engine and actuating suction and exhaust valves by means of the working arm. CONSTITUTION:A cam groove 12 serving as a working arm drive part, is formed at one side of a crankshaft 6, and in particular, said groove 12 is formed in a drive part chamber 9 which is positioned in the proximity to a working arm chamber 10. An arm supporting part 17 is formed in the working arm chamber 10, while working arm 19 being swingably pivoted to said part by means of a supporting rod 18. A long slot 20 is formed in the upper end part of the working arm 19 and a pin 21 of a connecting member 22 is engaged in the long slot 20. The connecting member 22 is connected to a spool 23 of a spool type suction and exhaust valve. Another long slot 25 is formed in the lower end part of the working arm 19 and a pin 26 of a block member 27 which is slidable along a slide rail 28 is engaged in the long slot 25. The block member 27 has a guide member 30 at its lower end, which is engaged with a cam groove 12.

Description

[Detailed description of the invention] This Ji@ is 4-9F-ita-β daidase! 11 on the engine
Suru.

In general, the 40 types of Nijin are equipped with a camshaft for operating the intake and exhaust valves), and a reduction gear mechanism) and a tatsun axis 0 @ rotation /! The deceleration is transmitted to the camshaft, which operates the intake and exhaust valves via the power shaft. However, as mentioned above, the 1kII structure required a power shaft and a group of gears for reduction, which placed a heavy burden on the weight of the 2s F drawing.

The present invention is intended to solve the above-mentioned problems, and to significantly reduce the weight of Enzone and reduce the cost by 1. The present invention will be described below with reference to the drawings.

In No. 111, which is a schematic longitudinal cross-sectional view of the engine according to the present invention, reference numeral 1 is the Enrin main body, a fist consisting of a V-enda middle case, etc., and a V Rimme head is arranged on the upper side of the Enrin main body 10. has been done. (S is a piston, S is a connecting gear, and 6 is a tumbler shaft). It is being

A drive section chamber 9 is formed in the crank chamber sowIIPIC within the main body l, and an operating arm w11 is formed above and below the drive section chamber 90. The cutting shaft 6 is polished inside the drive section chamber, and the tack shaft 60 is provided with a cam groove 1 inside the drive section chamber as the operating shaft drive section. is formed. The tip of the interior of the nine-tawner shaft 60 drive unit (the right end in Figure 1) is
It is supported by a drive wall 16 via a bearing 1b.

An arm support 1117 is formed on the operating arm 1tit@, and a substantially vertical operating arm 19 is pivotally connected to the arm support portion 17 via a horizontal support shaft 18 so as to be able to freely vibrate. At the top end, there is an inscription of ``Ko-kō-raku O'', and 01
Connecting member for 41L2@! ! ! The O-bin 21 is engaged and the connecting member! Two company spool μ type suction and exhaust valve spools! It is connected to 8. The small diameter part of the spool is fitted into the cylindrical part 2za of the connected spool. It is designed so that it can be moved integrally with the Oiku materials 22.

A KFi hole 26 is formed at the lower end of the actuating arm 19 and is a long hole! IIK is engaged with the horizontal pipe 270. The block body 27 is a guide hole parallel to the crankshaft 6! 9 and a guide hole! Slide tray parallel to the crankshaft via 9, II/! 8K.

They are fitted so that they can move freely in the longitudinal direction of the crankshaft. At the lower ends of the two splitter bodies, downwardly protruding guide plates 80 are pivotally mounted on a vertical axis so as to be rotatable and non-removable. Kt to follow the shape of the bottom of the
The cam groove 1 is formed in an arc shape when viewed from the left side of the ST diagram.
2 is engaged.

The fuel injection ring 81 is fixed to the working arm chamber wall s2, and its structure is parallel to the crankshaft 6 in the working arm chamber. On the other hand, on the operating rod side (right side in Figure 1) of the plotter, which has a weight of 70, is the operating rod I.
An I pump operating surface 01L is engraved on which the l& can be pushed.

The fuel injection engine s1 is injected into the injection nozzle/l via three high-pressure pipes.
14.

Next, the shape of the groove 1!0 and the structure of the Sudep type intake and exhaust valves will be explained in detail. Cam groove 120 As shown in Fig. 1, which is an open view of the viewer, the cam groove 18 has an arc-shaped first groove and a second groove that extend outward from each other in the axial direction. End A of Figure 2 of Lu @ Kamonate attack, Ryoji s5, Hatake 6
intersect in an X-shape when viewed in the direction of arrow B in FIG.

That is, the guide body 8 first moves to the position of the 11aO temporary Si wire (
Assuming that the crankshaft 6 is located at the position (approximately the position where exhaust begins), the crankshaft 6 is at the xriao arrow! Sekihiro rotates once in the rotation direction corresponding to the direction, guided by the guide body 16Fi first path 86,! 11 &, from the 1st road sk past the end A, the 2nd road 8gEl), 1st jll! The guide body O is guided by. That is, at the threshold at which the crankshaft 6 makes two rotations, the guide body sO moves left and right along the length direction of the crankshaft (
It vibrates once each time (left and right in Figure 1) and returns to its original position.

Sday β type intake and exhaust valve 071L goo fi'2@ is V1
hmm! It is fitted into the valve hole s7 of the head 2 so as to be rotatable and movable in the axial direction). !
A gas passage hole ss perpendicular to the spool 1 is formed, and a perfectly circular shadow-shaped groove IA9 is formed in the lengthwise direction of the spool. The intake passage 46 and the exhaust passage 4, which are connected to the cylinder head 2, are connected to the cylinder head 2.
As shown in FIG. 8, which is a partial cross-sectional view of the valve hole, the spool 21B is rotated and axially opened into the valve hole s7 at nine positions spaced apart from each other in the circumferential direction of the valve hole s7. Opening and closing of the combustion chamber 46 of the selection passages 46, 46 by sliding, and ma! *40 seals are to be performed.

That is, spoo, a'i! Move s in the longevity direction KIII,
As shown in Figure 1, the passage hole 1JI is used for intake and exhaust passage 46.46.
The spool length direction is aligned with the spool length direction, and the passage hole s8 is aligned with the intake passage 4! by rotating the DK sday*gs clockwise to the state shown in FIG. When they meet, the combustion chamber 40 and the intake passage 4h are connected, and the passage hole s8 is connected to the exhaust passage by rotating the spout fi/28 counterclockwise (see the foreshadowing in Figure 8). 46, the selective exhaust passage 46 and the combustion chamber 40 are communicated with each other. Furthermore, by pushing the spool 28 to the left side from the position 1 in FIG. 1), the baking chamber 4 is sealed.

Sude p! ! 80 The sliding excitation operation is performed by the actuating arm 1G, but Sday μ! The rotational movement of 8 is performed by using the guide groove 119 for the sprue and plow and the guide body 42 that engages with the guide groove 111 from above. That is, the guide body 42 is supported downwardly on the upper wall of the dollar head 2 so as to be rotatable around a vertical axis and cannot fall off.
゛While the 2s is reciprocating along the lengthwise direction, the guide groove 89 is inserted into the fourth
It is designed to move in the direction of arrow F in the figure. When the snow can be pulled to the right in FIG. 1 as close as possible to the maximum extent, the action of the guide groove 89 and the guide body 420 causes the spool to move clockwise in FIG. 8. rotated by
See you again Sude A/! When the field is pushed to the left in FIG. 1 to approximately the maximum extent, the spoop β2s is rotated counterclockwise in FIG.

K? −/< − is formed. That is, when the engine is stopped, the guide body 42 engages with either end of the guide groove 8- in the spool length direction.The operation will now be briefly explained in sections 6 to 8. Figure 6 shows the time of intake, Figure 6 shows the time of compression, Figure 7 shows the time of ignition and explosion, and Figure 8 shows the time of exhaust.As shown in Figure 6, the intake passage 41 and passage hole 8#I are The heel of the air intake through the cam groove l snow Of! i
@The operating arm tS rotates counterclockwise from the position shown in Fig. 6, and it's amazing! 8 into the direction of arrow D1 to seal the combustion chamber 4° as shown in Fig. 6. At this time, combustion chamber 4
Compression of ° is performed. Next, the operating arm 19 is *g
From the position shown in the figure, it is further rotated counterclockwise to the position 1 in Figure 7, and the actuation surface tyt1b of the injection d pump 81 is pressed to cause fuel to be injected, ignited, and exploded. During the ignition and explosion strokes, the spool 28 rotates counterclockwise in the direction of arrow E in FIG. 7 due to the action of the guide groove 89. After the explosion, when the actuating arm le rotates clockwise from the position shown in FIG. 7, it pulls the spoo A/28 in the direction of arrow DI to the position shown in FIG. 8. Then, exhaust is performed.

After exhausting, the action of the guide groove sfI is applied to the sprue, A/! I
rotates clockwise in the direction of arrow E in Fig. 8, and the position 111 in Fig. 6
Return to

In addition, Figure 1 shows the state of the cabinet moving from Figure 8 to Shape 11 in Figure 6.

As explained above, the present invention forms an actuation arm driving part, for example, a cam groove 12, in the tarasciter shaft 6, and the actuation arm i engages with the cam @11 and moves by the rotation of the crank @6.
ll is pivotally attached to the engine, and the actuating arm 19 is configured to operate the suction and exhaust valves (for example, the spool-type micro and exhaust valve sprues μ2s). The weight of the engine, which does not require a power shaft and a group of gears for reduction, can be significantly reduced, and costs can also be reduced. If the actuating arm 19 also operates the fuel injection cylinder 81, it is possible to further reduce weight and cost.

In addition, in the illustrated engine, a single actuating arm operates a single sprue-type intake and exhaust valve, but a spool-type suction and exhaust valve that has multiple sprues, for example, one for intake and one for exhaust. class, each with a spool of
In the case of an exhaust valve, a total of two operating arms, one for intake and one for exhaust, may be provided. Also, in an engine that has one pair of intake passages and one exhaust passage for each combustion chamber,
If you have two spools as shown in Figure 1, you can use one operating arm to operate the two spools. The spool may be operated.

Of course, the present invention is not equipped with a spout-type suction and exhaust valve as shown in the figure, but with a mushroom-type suction and exhaust valve.
It can also be applied to the prepared nine engines.

Also, the drive section is not as specified, but may be one in which a cam flange is latent in the tarastator shaft and a fork-shaped guide body is engaged with the cam flange.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of a 4-cycle μ diesel engine according to the present invention, Fig. 2 is an exploded view of the drive unit as viewed from the I arrow, Fig. 8 is a partial view of Fig. 1-11 is an enlarged partial cross-sectional view of the figure, and FIGS. 5 to 8 are schematic vertical cross-sectional views of the engine showing states during intake, compression, ignition, explosion, and exhaust, respectively. ...Tarashita axis, 1! ...Cam groove (-Ii of the operating arm drive part), 19... Operating arm, 28... Spoop p (an example of an intake and exhaust valve) Patent applicant: Yanmar Diesel P Co., Ltd. 5th F! ! 6m Fig. 8

Claims (1)

[Claims] The Tatsunta axis Kf'F111 arm skeleton is used, and it is attached to the actuating arm drive part, and is pivoted to the actuating arm Enzon that lifts up by the Tatsunku axis O1m rotation, and is attached to the actuating arm drive part.
4+ Itap Day (! engine) characterized by being configured to operate the intake and exhaust valves.