JPS5923013A - Valve cage of oil pressure type valve head gap removing device in valve moving mechanism - Google Patents

Abstract

PURPOSE:To secure the circulation of a sufficient quantity of oil and the strength of the titled valve cage by a method wherein a main oil circulating slit of a large width and an oil circulating slit of a small width are formed in the valve cage adopted to hold a check valve with respect to a valve hole between an oil pressure chamber of the oil pressure type valve head gap removing device and an oil sump. CONSTITUTION:The oil pressure chamber 3 is defined by a cylinder 1 and a plunger 2 sliding within the former. The oil pressure chamber 3 is able to communicate with the oil sump 4 within the plunger and the valve hole 5. The check valve 15 adopted to open and close the valve hole 5 is held by the valve cage 12'. The valve cage 12' comprises a main section 12'a and a flange section 12'b and is provided with an oil circulating slit 13' comprising the main oil circulating slit 13'a of a large width and the slit 13'b of a small width. Consequently, it is possible to secure the circulation of a sufficient quantity of oil and the strength of the valve cage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically eliminates the spring force and hydraulic pressure caused by the gap between the valve heads in the valve train of an internal combustion engine, so that the valve train always operates quietly. The present invention relates to a valve cage of a hydraulic valve head gap eliminating device in such a valve operating mechanism.

Such devices as shown in FIGS. 1 to 3 are conventionally known.

First, in order to facilitate understanding of the present invention, the structure of this conventional device will be explained with reference to FIGS. 1σ, and is formed into a bottomed hollow cylinder shape with a closed end wall 1h at the lower part, and this cylinder 1 is formed in a support hole Ea of the engine body E.
is fitted in.

Inside the cylinder 1 is a spherical end 2 from its open end 1a.
A plunger 2 having a diameter A1 is fitted so as to be slidable up and down, and a hydraulic chamber 3 is defined between the inner end of the plunger 2 and the closed end wall 1b of the cylinder 1. An oil reservoir 4 and a valve hole 5 that communicates the oil reservoir 4 with the hydraulic chamber 3 are formed. The oil reservoir 4 includes a through hole 6 formed in the side wall of the plunger 2, an annular oil passage 7 provided between the sliding surfaces of the cylinder 1 and the plunger 2, a through hole 8 formed in the side wall of the cylinder 1, and the outer periphery of the cylinder 1. This oil supply passage 1 communicates with an oil supply passage 10 through an annular oil passage 9 formed in a plane υ.
It is always filled with oil that is sent to the tank.

A cylindrical stopper 11 is integrally formed at the inner end of the plunger 2 and abuts against a step 1C formed on the inner circumferential wall of the inner end of the cylinder 1 to restrict the retreat limit of the plunger 2.

A valve cage 12 is accommodated in the chamber 3. This valve cage 12 is constructed as shown in Figs.
(It consists of a main body part 12a having a cap shape and a flange part 12h integrally extending outward from the end of the main body part 12a. From the middle of the side wall of the main body part 12a to the end of the flange part 12h. A plurality of oil passage slits 13 are vertically drilled up to the edge.
It is held in place.

A check valve 15 for opening and closing the valve hole 5 is accommodated in the valve cage 12 in a floating manner.The check valve 15 opens when the pressure in the hydraulic chamber 3 is reduced, and when the pressure in the chamber 3 increases. A stopper 16 for regulating the valve opening stroke is attached to the valve cage 12.
is located at the bottom of the Further, a resilient spring 17 is housed in the hydraulic chamber 3 and biases the plunger 2 to project above the cylinder 1. The flange portion 12h of the valve cage 12 is held between the resilient spring 11 and the inner end surface of the plunger 2.

The plunger 2 has a rocker arm R with its spherical end 2a.
The swinging tip of this rocker arm R is in contact with the valve head of a poppet valve V that opens and closes the intake air of the internal combustion engine or the 1-no-1 air boat 18, and the rocker arm R is supported in the middle part of the swinging tip of the rocker arm R. Valve drive cam C that moves to open poppet valve V
is placed. The poppet valve VVC is provided with a valve spring S that biases it in the valve closing direction as usual 5, and the resilient force of this valve spring S is much stronger than that of the resilient spring 17.

Next, to explain the operation of this conventional device, the poppet valve l'
When is closed, the plunger 2 moves upward with the force of the spring 17, pushes up the base end of the rocker arm R, and
Eliminate the gap between the swinging tip of the rocker arm H and the valve head of the poppet valve V. At this time, if the pressure inside the hydraulic chamber 3 is reduced due to the pressure of the plunger 2, the check valve 15 will open. Oil from the oil reservoir 4 is supplied into the hydraulic chamber 3 through the valve hole 5, and the hydraulic chamber 3 is filled with oil.

Next, when the cam surface of the valve drive cam C comes into contact with the rocker arm H due to the rotation of the valve drive cam C, the middle part of the rocker arm R is pushed downward and a valve opening force is applied thereto. Hydraulic pressure is generated in the closed hydraulic chamber 3, and the plunger 2 is supported by this hydraulic pressure, so that the rocker arm R is attached to the spherical end 2a of the plunger 2.
The poppet valve V is swung toward the poppet valve V side using the fulcrum as a fulcrum, and the poppet valve V is opened against the elastic force of the valve spring S. During this time, the oil in the hydraulic chamber 3 leaks slightly from between the sliding surfaces of the cylinder 1 and the plunger 2, but the leaked amount is replenished from the oil reservoir 4 when the poppet valve V is closed next time.

By the way, in such a valve head gap elimination device, when the pressure in the hydraulic chamber 3 is reduced and the check valve 15 is opened, the oil in the oil reservoir 4 is replenished into the hydraulic chamber 3 through the oil passage slit 13 of the valve cage 12. However, the replenishment time is short! h′
When the internal combustion engine is rotated at high speed, the oil passage slit 13 of the valve cage 12 is closed.
It is desirable to set the opening (-1 area) as large as possible. Therefore, the oil passage slit 13 has a wide width W and a long length L, that is, the oil passage slit 13 is made to have a wide width W and a long length L. However, if the oil passage slit 13 is made too large, the strength of the valve cage 12 itself will be impaired.

Further, the valve cage 12 is produced by press working from the viewpoint of productivity and cost, but in order to facilitate the press working, the oil passage slit 13 should extend to a position where it opens at the edge of the flange portion 12h. However, in order to most efficiently remove the debris from the valve cage 12 after the bus processing, the barrel polishing method (many grindstone-like pieces and many valve cages 12 are removed in a container) A method of polishing by placing the container in a container and rotating the container is adopted. In this case, the width W of the flange portion 125 of the oil passage slit 13 is larger than its thickness T. During the aforementioned barrel polishing, the oil passage slit 13 of one valve cage 12 is inserted into the oil passage slit 13 of the other valve cage 12. There is a concern that the edges of the flange portion 12b may get caught, which not only makes it troublesome to separate them after the polishing, but also causes deformation of the valve cage 12.

Therefore, in the present invention, a wide main oil passage slit with a predetermined width is formed in the side wall of the main body part of the valve cage in the vertical direction, and a main oil passage slit with a width narrower than the main oil passage slit is provided in the flange part of the valve cage. By forming a narrow slit that is thinner than the thickness of the flange part, the main purpose is to provide a valve cage that has high strength, high productivity, and low cost while ensuring the necessary oil flow. It is something.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 4 and 5. Like the conventional valve cage 12', the valve cage 12' has an annular flange portion 127h extending outwardly from the edge of the cap-shaped main body portion 12'a. The main body part 12'a is provided with seven oil passages l-13' extending therethrough, that is, on the side wall of the main body part 12'a, there are vertically extending holes at intervals in the circumferential direction. A plurality of upper oil passage slits 13'a are bored in the direction, and the main oil passage slit 13' is formed in the flange portion 12'h.
The end oil passage slit 1 is connected to a and opens at its edge.
Seven 3'h are provided. End oil passage l-13//
The iD width nyt is designed to increase the passage area of the entire oil passage 113' (which causes stress concentration during drawing and use of the valve cage 12'). Oil passage slit 13'a and end oil passage slit 13
The boundary point P of the area change between the main body part 12'a and the boundary point P of the area change is located at the flange part 12'b.
The difference R, -R2 between the radius R1 of the main body part 12'a and the maximum radius R2 of the main body part 12'a, and the radius r of the outer peripheral side connecting part between the main body part 12'a and the flange part 12'h. Set it to be larger than the radius. As described above, the boundary point P of area change is between the main body part 12'a and the flange part 12'h.
It is no longer located at the connecting curved part with the valve cage 12.
' Stress concentration during drawing press processing and use can be avoided.

As described above, according to the present invention, the knob cage 12
' consists of a cap-shaped main body part 12'a and a flange part 12'b integrally extending outward from the end of this main body part 12'a, and the main body part 12'a has a main body part 12'a. Oil passage slit 1
3'a, and the flange portion 12'h is formed with an end oil passage slit 13'/l which is continuous with the main oil passage slit l-13/a and opens at its edge. ; m oil slit) 13'h is narrower than the main oil passage slit 13'a and thinner than the thickness T' of the end oil passage slit 13'h, so that the oil passage slit 13' is As a whole, it is possible to secure a passage area necessary and sufficient for the required oil to pass through, and to increase the rigidity of the flange portion 12'h, thereby increasing the strength of the valve cage 12'. Further, by eliminating the engagement between the valve cages 12' during the barrel polishing described above, productivity can be increased and costs can be reduced, and the precision of the valve cages 12' can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional valve head gap elimination device, Fig. 2 is a plan view of a conventional valve cage, and Fig. 3 is a longitudinal cross-sectional view thereof.
4 and 5 show an embodiment of the present invention, with FIG. 4 being a plan view of the valve cage, and FIG. 5 being a longitudinal sectional side view thereof. C... Valve train cam, R... Rocker arm, 1... Cylinder, 2... Plunger, 3... Hydraulic chamber, 4...
・Oil sump, 5... Valve hole, 12'... Valve cage, 1
2'a...Main part, 12'h...Flange part, 13
〆... Oil passing slit, 13'σ... Main oil passing slit, 13'h... End oil passing slit, 15... Check valve, 17... Resilient spring (resilient member) Patent Applicant Honda Motor Co., Ltd. Representative Patent Attorney Ochiai w ″”'-：
71:: + Figure 4 Figure 5 Figure 2 Figure 3 Procedural amendment (L prefecture) Showa 5 "p + 11 u ta I + Patent Office 1 Hosho Palace 1, Elementary school 1 Cow display Showa 5 Hui, 4! Arrival request No. 33: (No. 77 2, Name of the invention Valve cage 3 of a hydraulic valve head gap elimination device in several structures, considering correction, relationship with 1st generation (system cow'I 'iF'l' l l
f h；il°1 person's name (s:+2) Book 111 techniques (
] Noi Kogyo Co., Ltd. 4, Agent 〒10
5 5. hli Contents of amendment in column 1, "Detailed Description of the Invention" in the original subject specification 1゜Specification 1, page 10, line 14 - 1 Please make it narrower. Insert the following sentence after ``. In this case, the width 1/I/ may be made extremely small so that the opposing inner surfaces of the slits 13'b aVc abut each other. ” Below 1-

Claims (1)

[Claims] The plunger (2) is fitted into the cylinder (1) with the sliding groove V, and the hydraulic chamber (
3), and this hydraulic chamber (3) is connected to the plunger (2) K.
It communicates with the oil reservoir (4) through the formed valve hole (5), and the valve hole (5) is opened when the pressure in the hydraulic chamber (3) is reduced;
Also, the check valve (15) is closed when the pressure is high.
In the hydraulic chamber (3), the plunger (2) is provided with a valve cage (12') that accommodates and holds the check valve (15).
) is forced to protrude outward from the cylinder (1) by the spring force (17), and its outer end supports the rocker arm (/?) of the valve mechanism, and the valve drive cam (/?) of the mechanism. The valve opening force of C) acts on the plunger (2) as a pressing force in one direction, 5 Vct, and the valve cage (12'
) has a cap-shaped main part (12'CZ) and this main part (12'CZ).
The flange part (12'l) integrally extends outward from the end of the main body part (12'(L)K
is the main oil passage slit 1-(13'a), and the flange portion C12'b) is provided with the main oil passage slit 1-(13/
1-1 end lubricating ring connected to a)
(13'/l), and the end oil passage slit (13'/l) is formed.
b) is narrower than the main oil passage slit (13'a);
and a valve cage of a front substitute valve head clearance elimination device in a valve operating mechanism, which is formed to be thinner than the width of the end oil passage ring (13'a).