JPS5985410A - Tappet mechanism of variable cylinder quantity engine - Google Patents

Abstract

PURPOSE:To reduce the total height of an engine by installing an actuator at a separated position from a tappet part, in a mechanism for varying the number of cylinders in operation by allowing the check valve of a hydraulic type valve gap adjusting mechanism to be inoperative by pressing said valve. CONSTITUTION:An actuator 50 of a solenoid valve which operates a rod 71 for pressing the check ball 72 of a hydraulic tappet 70 is arranged at a position departed from the installation part for the hydraulic tappet 70, and the driving force of the actuator 50 is transmitted to the rod 71 through a cable means 60, hydraulic means, or a vacuum means. Therefore, projection of the actuator 50 from a cylinder cover is prevented, and the total height of an engine can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve operating mechanism for a variable cylinder engine that is fully equipped with pressure-feed hydraulic tappets and has an automatic tappet balance adjustment mechanism, and particularly relates to a hydraulic tappet check ball operating section. 2. Description of the Related Art As a variable cylinder engine for the purpose of saving energy and improving fuel efficiency of the engine, a method has already been provided in which a well-known pressure-feeding hydraulic tappet is installed in the valve train of the engine. Figure 1 shows one of these methods, and shows the OHC valve mechanism lO of the engine.
A well-known pressure-feeding hydraulic tappet 20 is disposed on the hydraulic tappet 20, and a solenoid valve 30i, which is actuated by sensing an input signal from the engine via a microcomputer, is mounted on a head force bar 40. The operation of the valve 80 presses the check ball 21 of the hydraulic tappet 20 via the iron rod 22, thereby removing the rigidity of the hydraulic tappet 20, thereby creating a valve lift. ! 71'V stop, that is, opening and closing of intake and exhaust valve ■1! ! It is configured to stop 71.

That is, normally, the rocker arm 18 performs a rocking motion around the fulcrum A of the rocker-to-boat 14, and the valve 11 repeats opening and closing operations according to the word of mouth of the camshaft 12. For example, the load on the engine is small. When. When the solenoid valve 80 is activated and the iron 22 presses the check ball 21 completely downward, the pressure chamber 28 and the compartment of the reservoir 24 are communicated with each other, and the oil in the pressure chamber 28 can be moved into the reservoir 4. 12, when the tappet body 25 moves up and down, the tappet body 25
Move upward relative to. At this time, the rigidity of the hydraulic tappet 20 is removed, so the Ronca arm 18 is
The pivoting motion is repeated using the point as a full fulcrum, and the valve lift mechanism is stopped, thereby preventing the valve 11 from opening and closing.

By the way, as shown in FIG. 1, conventionally, a method has been adopted in which a solenoid valve 30 as an actuator is directly installed in the mounting part of the hydraulic tappet 20, so that the solenoid pulp 80 is not connected to the cylinder end cover 40 of the engine. Since the engine is installed protrudingly, the overall height of the engine body increases, creating a problem in which it is difficult to install the engine within a space of a predetermined size in the engine room.

A technical problem of the present invention is to prevent the overall height of the engine body from increasing.

The technical means of the present invention to achieve the above object is to install an actuator such as a solenoid pulp that drives a cylinder that presses a check ball of a hydraulic tappet in a separate position from the mounting part of the hydraulic tappet, and to The driving force is transmitted to the rod by cable means, hydraulic means, or vacuum means.

According to the above technical means, by separating the solenoid pulp from the cylinder head, the solenoid pulp becomes less susceptible to heat and vibration from the cylinder head, and the durability is greatly improved.

Further, conventionally, a solenoid pulp was attached to each hydraulic tapeft, but in the present invention, it is possible to operate a plurality of hydraulic tapefts with one solenoid pulp. In other words, by branching the piping, the number of actuators can be reduced to one per the number of actuators.

Next, an embodiment illustrating a specific example of the technical means of the present invention described above will be described.

2 and 8 show the first embodiment, the basic configuration of which is that the solenoid valve actuator 50 is connected to the rod 71' (
i7 is driven to press the check ball 72. An iron core 51 is arranged in the solenoid pulp 50,
A bobbin 58 is provided between the iron core 51 and the magnetic outer yoke 52.
A solenoid coil 54 wound on top is installed. An axially movable rod 55 is disposed in a hollow portion within the iron core 51, and a cable 60 -'AM 60 n is attached to the upper end 7 flange 56 of the rod 55. The other end 60b of the cable 60 is connected to the front door 1 of the hydraulic tapeft 70.
is fixed. When the solenoid pulp 5 () receives an electric signal, the rod 55 moves upward in the drawing due to the excitation action of the solenoid coil 54.

As a result, the other end 60b of the cable 60 presses the entire length of the door 1 downward and pushes down the check ball 72, so that the pressure chamber 73 and the reservoir 74 are brought into communication and the rigidity of the hydraulic tappet 70 is removed.

Next, FIGS. 4 and 5 show a second embodiment. The working oil pumped by the oil pump is solenoid pulp 80
Input boat 819 passage 821 passage 88. Output boat 8
4 to an input chamber 91 of a hydraulic tappet 90. A solenoid coil 88 wound around a bobbin 87 is installed between the iron J685 and the yoke 86. When the solenoid noggle 81) receives an electric signal, the excitation action of the solenoid coil 88 causes the valve member 89 to be
85 plays a role and opens passage 88. The result is (
乍! (Hydraulic tapets from l cut oil hi output boat 84)
91) 0) Introduced into input chamber 91. The plunger rod 92G-j is disposed so as to be able to slide inside the body 93, and is displaced downward as shown in the figure by the oil pressure in the input chamber 91 to press the check ball 94, so that the pressure chambers 95 and 11 < 96 7'l' off-shore, hydraulic tappet 90σ) Rigid force < 1 fork removal force) f'L Figures 6 and 7 show the present invention σ
J 8th real 1st direct example is shown. In this embodiment, a pump actuator is used as the drive source, and the plunger rod of the hydraulic tappet is moved via the hydraulic oil by the action of the master IJ counter. The master cylinder 100 is connected to the J by the diaphragm l 131.
A signal negative pressure chamber 1tjz2 configured, the negative pressure chamber 113
2) The entire IUB communicates with, for example, an engine manifold negative pressure source. A diaphragm 101 is fixed to the piston 104, and a diaphragm 101 is fixed to the piston 104.
(J5 consists of n1 diagnosis piston 105 and negative pressure chamber 11)
A piston return spring 106 disposed within the piston 2 urges the piston upward in the drawing. The working oil in the reservoir 107 is supplied to the can 1 member 1 through an oil supply hole 108 and a passage 109.
It is supplied to the cylinder 112 via the outer periphery of the cylinder 10 .

Now, when the signal negative pressure is supplied to the negative pressure chamber 102, the piston 1 (J4) moves downward in the figure, and at this time the cup member 11
When the oil relief hole 118i is closed, the oil in the cylinder 112 is pressurized, and the pressurized oil is supplied from the first check pulp 114' and the push-open output boat 115 to the pressure chamber 121 of the hydraulic tappet 120. When the negative pressure in the negative pressure chamber 102 becomes smaller, the piston 104 is moved upward in the drawing by the piston return spring 106 and the cylinder return spring 116. At this time, the oil pressure in the cylinder 112 decreases, so the oil in the pressure chamber 121 of the hydraulic tappet 120 pushes up the second check valve 117i integrated with the first check pulp 114, allowing oil to escape from the cylinder 112. The oil returns to the reservoir 107 through the hole 1t3y. When pressure oil is supplied to the pressure chamber 121 of the hydraulic tappet 120, the plunger rod 122 moves downward in the drawing, and as a result, the check ball 123i is pushed open. At this time, since the pressure chamber 124I and the reservoir 125 are communicated with each other, the hydraulic pressure is removed. Incidentally, FIG. 8 is a partially enlarged view of FIG. 6.

Furthermore, FIG. 9 shows a fourth embodiment of the present invention, in which a plunger rod of a hydraulic tappet is directly driven by a vacuum. (Hydraulic tube shown in Figure 9)
At 130, the outer periphery of the diaphragm 183 is sandwiched between the body 131 and the cover 182, and the diaphragm 13
3, a signal negative pressure chamber 184 is formed. The negative pressure chamber 18
4 communicates with, for example, the manifold negative pressure source of the engine via the boat No. Now, when the negative pressure signal '' is supplied to the negative pressure chamber 134, the f plunger wand 186 moves downward in the figure against the urging force of the spring 187 and the check ball 188i
Pressure chamber 139 and plunger 140 communicate with each other by pressing down (o). Therefore, the oil reservoir 1 in the pressure chamber 139
Since the rigidity of the hydraulic tappet (130) is removed, the valve lift mechanism stops.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view showing a conventional valve mechanism of a variable cylinder engine, FIGS. 2 and 8 are sectional views showing a first embodiment of the present invention, and FIGS. FIG. 5 is a sectional view showing a second embodiment of the invention, FIGS. 6, 7 and 8 are sectional views showing a third embodiment of the invention, and FIG. 9 is a sectional view showing a fourth embodiment of the invention. FIG. 50/80...Solenoid valve, 70/90/12
0.130...Hydraulic tappet, 71.92.122.
186...Plunger rod, 72.94.123.
188... Plunger rod, 60... Cable,
100... Master Cylinda Patent Applicant Aisin Seiki Co., Ltd. Representative Rei Nakai Figure 2 Figure 4 Figure 9 Figure 13': 1

Claims (1)

[Claims] an actuator means for detecting and operating an engine human power signal in a valve train equipped with a pressure-feeding hydraulic tapent;
A valve operating mechanism for a variable cylinder engine, wherein a suppressing means for pressing a check ball of the hydraulic tappet by the actuation of the actuator means is disposed, and the actuator means is installed at a different position from the hydraulic tappet part.