JPH09250321A - Valve system of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembling work of a valve system by communicating a lubricating-oil junction passage with a lubricating-oil feeding passage without positioning. SOLUTION: A rocker-arm pivotal shaft 48 is inserted into a rocker-arm case 4 through a shaft-penetrating hole 42 from the outside of the rocker-arm case 4, and rocker arms 46, 46 are rockably and externally fitted to this rocker- arm pivotal shaft 48, so that the junction passage outlets 49b, 49b of a lubricating oil junction passage 49 are faced to the sliding clearance between the rocker- arm pivotal shaft 48 and the rocker arms 46, 46, and the end part of the rocker- arm pivotal shaft 48 is inserted into a bearing-receiving hole 43, and the male screw part 48b of the rocker-arm pivotal shaft 48 is fittedly screwed into the shaft-penetrating hole 42. Then, the rocker-arm pivotal shaft 48 is bridged inside the rocker-arm case 4, and also the junction passage inlet 49a is faced to the deep end space 43a of the bearing-receiving hole 43, so that the valve system of an engine in which the lubricating oil junction passage 49 is communicated with a lubricating-oil feeding passage 47 can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine valve operating system.

[0002]

2. Description of the Related Art A conventional valve operating system for an engine is shown in FIG. This leads out the lubricating oil pressure feed passage 147 from the lubricating oil pump 144, and the pressure feed passage outlet 14
7a is opened in the cylinder head surface 150, the rocker arm bracket 151 is internally provided with the first lubricating oil relay passage 152,
A second lubricating oil relay passage 153 is provided inside the rocker arm pivot 148, and the pressure feeding passage outlet 147a and the first lubricating oil relay passage 1 are provided.
The rocker arm bracket 151 is attached to the bracket mounting bolt 15 with the passage entrance 152a of 52 abutted.
It is fixed to the cylinder head 103 at 4.

Then, the passage outlet 152b of the first lubricating oil relay passage 152 and the passage inlet 1 of the second lubricating oil relay passage 153.
The rocker arm pivot 14
8 is fixed to the rocker arm bracket 151, and the rocker arms 146 and 146 are swingably fitted to the rocker arm pivot 148 so that the rocker arm pivot 148 and the rocker arms 146 and 146 slide in the sliding gap of the second lubricating oil relay passage 153. The passage exits 153b and 153b are exposed.

[0004]

In the above prior art, when fixing the rocker arm bracket 151 to the cylinder head 103, it is necessary to align the pressure feed passage outlet 147a with the passage inlet 152a of the first lubricating oil relay passage 152. In addition, when fixing the rocker arm pivot 148 to the rocker arm bracket 151, the passage outlet 152b of the first lubricating oil relay passage 152 and the second lubricating oil relay passage 153 are also provided.
Since it is necessary to align the passage inlet 153a with the valve inlet 153a, it is troublesome to assemble the valve operating device.

An object of the present invention is to provide a valve operating system for an engine which can be easily assembled.

[0006]

As shown in FIG. 1, the present invention relates to a valve operating system for an engine, which is characterized as follows. That is, of the pair of peripheral wall portions 4a and 4b of the rocker arm case 4 that face each other, the shaft through hole 42 is opened in one peripheral wall portion 4a, and the other peripheral wall portion 4b from the inner peripheral surface toward the inside of the meat wall. The shaft receiving hole 43 is recessed,
A lubricating oil pressure transmission passage 47 is led out from the lubricating oil pump 44, an outlet 47a of the pressure transmission passage is opened facing the rear end space 43a of the shaft receiving hole 43, and a lubricating oil relay passage 49 is provided inside the rocker arm pivot 48. The relay passage inlet 49a is formed in the tip end surface 48a of the rocker arm pivot 48, and the relay passage outlets 49b and 49b are opened in the peripheral surface of the rocker arm pivot 48, and the male screw portion 48 is formed at the base end of the rocker arm pivot 48.
b is provided.

Then, a rocker arm pivot shaft 48 is inserted into the rocker arm case 4 from the outside of the rocker arm case 4 through the shaft through hole 42, and the rocker arms 46 and 46 are externally fitted to the rocker arm pivot shaft 48 so as to be rockable. The relay passage outlets 49b and 49b are exposed to the sliding gap between the rocker arm 48 and the rocker arm 46 and 46, the tip end of the rocker arm pivot shaft 48 is inserted into the shaft receiving hole 43, and the male screw portion 48b is screwed into the shaft through hole 42. The rocker arm pivot 48 is installed in the rocker arm case 4, and the relay passage inlet 49a is exposed to the rear end space 43a of the shaft receiving hole 43 so that the lubricating oil relay passage 49 communicates with the lubricating oil relay passage 49. It is characterized by having done.

[0008]

The functions and effects of the present invention are as follows (see FIG. 1). That is, by inserting the rocker arm pivot 48 into the rocker arm case 4, the rocker arm 46.
46 is externally fitted, the tip end portion of the rocker arm pivot shaft 48 is inserted into the shaft receiving hole 43, and the male screw portion 48b is inserted into the shaft through hole 42.
Since the lubricating oil relay passage 49 can be communicated with the lubricating oil pressure transmission passage 47 without alignment by simply screw-fitting into the valve fitting assembly work of the valve gear can be easily performed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 3 are views for explaining an embodiment of the present invention. In this embodiment, a horizontal diesel engine is used. The configuration is as follows. That is, FIG.
As shown in FIG. 3, the cylinder head 3 and the rocker arm case 4 are sequentially arranged on the top dead center side of the cylinder block 7, the cylinder liner 8 is arranged in the cylinder block 7, and the cooling water jacket 21 is arranged around the cylinder liner 8. Place and
A radiator 41 is arranged above the cooling water jacket 21 so that the cooling water jacket 21 and the radiator 41 communicate with each other. A fuel tank 6 is arranged above the crankcase 1 of the cylinder block 7.

In this embodiment, the valve gear is as follows. That is, as shown in FIG. 1, of the pair of peripheral wall portions 4a and 4b of the rocker arm case 4 facing each other, one peripheral wall portion 4a is provided with a shaft through hole 42, and the other peripheral wall portion 4b is provided with an inner peripheral surface thereof. The shaft receiving hole 43 is recessed from the inside toward the meat wall, and the lubricating oil pump 44 extends from the lubricating oil pressure passage 4
7, the pressure feed passage outlet 47a is opened so as to face the inner end space 43a of the shaft receiving hole 43, a lubricating oil relay passage 49 is internally provided in the rocker arm pivot shaft 48, and the relay passage inlet 49a is provided in the rocker arm pivot shaft 48. The relay passage outlets 49b and 49b are formed on the peripheral surface of the rocker arm pivot shaft 48, and the male screw portion 48b is provided at the base end portion of the rocker arm pivot shaft 48 while being provided on the tip end surface 48a.

Then, a rocker arm pivot shaft 48 is inserted into the rocker arm case 4 from the outside of the rocker arm case 4 through the shaft through hole 42, and the rocker arms 46 and 46 are externally fitted to the rocker arm pivot shaft 48 so that the rocker arm pivot shaft 48 is rockable. The relay passage outlets 49b and 49b are exposed to the sliding gap between the rocker arm 48 and the rocker arm 46 and 46, the tip end of the rocker arm pivot shaft 48 is inserted into the shaft receiving hole 43, and the male screw portion 48b is screwed into the shaft through hole 42. The rocker arm pivot 48 is installed in the rocker arm case 4, and the relay passage inlet 49a is exposed to the rear end space 43a of the shaft receiving hole 43 so that the lubricating oil relay passage 49 communicates with the lubricating oil relay passage 49. I am allowed. A decompression shaft 40 is installed in the rocker arm case 4 in parallel with the rocker arm pivot shaft 48.

A biasing spring 55 is fitted between the rocker arms 46, 46 and is fitted around the rocker arm pivot 48.
The spring pressure of the biasing spring 55 causes the rocker arm 46.
The rocker arms 46, 46 are positioned by bringing the rocker arms 46 into contact with the peripheral wall portions 4a, 4b of the rocker arms 4. A spacer cylinder may be used instead of the biasing spring 55.

In this embodiment, as shown in FIGS. 2 and 3, the cylinder block 7 is divided into a head-side portion 7a and a crankcase-side portion 7b.
a and the cylinder head 3 are formed in a series by integral casting, and the crankcase side portion 7b and the crankcase 1 are formed in a series by integral casting, and a liner tip fitting hole 16 is formed in the head side portion 7a. A liner base end fitting hole 17 is opened in the crankcase side portion 7b, the base end portion 8a of the cylinder liner 8 is inserted into the liner base end fitting hole 17 from the cylinder head 3 side, and the cylinder liner 8 to the crankcase 1 side is inserted. In the state where the leading end 8b of the cylinder liner 8 is fitted into the liner leading end fitting hole 16 while preventing the slip-off, the head-side portion 7a and the crankcase-side portion 7b are connected by the connecting bolt 20.

As described above, since the cylinder head 3 and the head-side portion 7a of the cylinder block 7 are integrally cast, head mounting bolts are unnecessary. For this reason,
Distortion of the cylinder liner 8 due to tightening of the head mounting bolt is eliminated, and seizure between the cylinder liner 8 and the piston 13 due to this is not caused. Further, since the head mounting bolt is not required, the modification for increasing the inner diameter of the cylinder can be performed without being disturbed by the head mounting bolt, and the modification for increasing the displacement can be easily performed.

Further, the head-side portion 7a can be separated from the crankcase-side portion 7b, and the cylinder liner 8 and the piston 13 can be inserted into and removed from the crankcase-side portion 7b from the position where the head-side portion 7a was located. it can. For this reason, the engine assembling work and the maintenance work are simplified as compared with the case of performing these insertion / removal work through the narrow crankcase 1.

As shown in FIG. 1, the intake pipe 1 led out from the rocker arm case 4 and the cylinder head 3 is formed in the integrally cast product including the head-side portion 7a and the cylinder head 3.
4 and the exhaust pipe 15 are also included. For this reason, a part of the heat of the Linda head 3 is partially absorbed by the rocker arm case 4 and the intake pipe 14.
Heat is also radiated from the exhaust pipe 15 and the amount of heat stored in the cylinder head 3 is reduced, so that the cylinder head 3 is less likely to be damaged by a heat load. The rocker arm case 4 is extended to a position farther from the cylinder head 3 than the rocker arm pivot shaft 48 and the decompression shaft 40.

As shown in FIG. 2, the fuel injection pump 18 is provided in the integrally cast product including the crankcase-side portion 7b.
This pump mounting seat 19 is also included.
The head side portion 7a is seated on the head. Therefore, the pump mounting seat 19 can also be used as the mounting seat of the head-side portion 7a of the cylinder block 7, and it is not necessary to separately form these, so that the engine can be made compact.

A bottom dead center side opening 23 is opened at the bottom dead center side end surface of the crankcase 1, and this is closed by a bottom dead center side lid body 24. The top dead center side end surface of the rocker arm case 4 is top dead center. The side opening 25 is opened, and this is closed by the top dead center side lid body 26. The bottom dead center side opening 23 is used for attaching / detaching the counterweight 30 to / from the crankshaft 29, maintaining the crankcase 1, and the like. The top dead center side opening 23 is used when the valve spring 45 and the rocker arm 46 are taken in and out, maintenance of the rocker arm case 4 and the like are performed. A crankshaft insertion hole 32 and a balancer shaft insertion hole 33 are formed in the crankshaft shaft end side wall 31 of the crankcase 1, and the crankshaft 29 and the balancer shaft 34 are inserted into the crankcase 1 via these. .

The crankshaft shaft end side wall 3 of the crankcase 1
A timing transmission case 35 is provided on the outside of 1, and a timing transmission device 36 is accommodated inside the case. This timing transmission case 3
The case peripheral wall 37 of No. 5 is included in the one-piece cast product including the crank case side portion 7b. Timing transmission case 35
The case end wall 38 is detachably attached to the case peripheral wall 37. The timed rolling case 35 is also used as the injection pump case 39, and the case peripheral wall 37 is also used as the pump mounting seat 19 of the fuel injection pump 18 as described above.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of essential parts of an engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the engine according to the embodiment of the present invention.

FIG. 3 is a vertical sectional side view of the engine according to the embodiment of the present invention.

FIG. 4 is a cross-sectional plan view of an essential part of an engine according to a conventional technique.

[Explanation of symbols]

4 ... Rocker arm case, 4a and 4b ... peripheral side wall, 42 ...
Shaft through hole, 43 ... Shaft receiving hole, 43a ... Back end space, 4
4 ... Lubricating oil pump, 46 ... Rocker arm, 47 ... Lubricating hydraulic pressure passage, 47a ... Pressure feeding passage outlet, 48 ... Rocker arm pivot shaft, 48a ... Tip surface, 48b ... Male part, 49 ... Lubricating oil relay passage, 49a ... Relay passage inlet , 49b ... Relay passage exit.

Claims (1)

[Claims] 1. A peripheral wall portion of a pair of peripheral wall portions (4a), (4b) of a rocker arm case (4) facing each other.
A shaft through hole (42) is formed in (4a), and a shaft receiving hole (43) is formed in the other peripheral wall portion (4b) from the inner peripheral surface thereof toward the inside of the meat wall so that the lubricating oil pump (44) The lubricating oil pressure passage (47) is led out, and the pressure passage passage outlet (47a) is connected to the shaft receiving hole.
(43) is opened facing the rear end space (43a), the lubricating oil relay passage (49) is internally provided in the rocker arm pivot (48), and the relay passage inlet (49a) is provided at the tip end surface of the rocker arm pivot (48) ( Four
8a) and relay passage outlets (49b) and (49
b) is opened in the peripheral surface of the rocker arm pivot (48), and a male screw part (48b) is provided at the base end of the rocker arm pivot (48), and the rocker arm case (4) is passed through the shaft through hole (42) from the outside of the rocker arm case (4). Insert the rocker arm pivot (48) into (4), and insert the rocker arm pivot (48) into the rocker arm.
(46)-(46) are fitted so as to be swingable so that the relay passage outlets (49b)-(49b) face the sliding gap between the rocker arm pivot (48) and the rocker arm (46)-(46). No, the tip end of the rocker arm pivot (48) is inserted into the shaft receiving hole (43), and the male screw part (48b) is screwed into the shaft through hole (42) to attach the rocker arm pivot (48) to the rocker arm case ( 4) Inside the relay passage entrance
(49a) faces the rear end space (43a) of the shaft receiving hole (43), and the lubricating oil relay passage (49) is provided in the lubricating hydraulic pressure transmission passage (47).
A valve operating device for an engine, characterized in that