JPS6095112A - Sealed type hydraulic lash adjuster - Google Patents

Abstract

PURPOSE:To reduce the cost and also to improve the durability of the seal by inserting a seal ring between the outer surface of the plunger and the inner surface of the plunger body allowing the seal ring to slide and thus by forming a space to absorb the hydraulic fluid. CONSTITUTION:A plunger 31 capable of sliding motion is fitted in a plunger body 35, while a nonreturn valve 19 partitions a high-pressure chamber 7 and a reservoir chamber 17. The reservoir chamber 17 is sealed by a seal ring 38 which is inserted between the outer surface of the plunger 31 and the inner surface of the plunger body 35 so that the seal ring is allowed of sliding motion. Since a diagram fixed between the outer surface of the plunger and the inner surface of the plunger body is not used as a seal, the fitting of the seal can be done easily and the cost is reduced. Moreover, as a thick seal can be used, durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 1 jill valve 44% for a V cycle engine.
! ! 't K Regarding the lash adjuster used, the closed type oil field lash adjuster that uses special trap hydraulics (
Hereinafter, it is simply referred to as lash adjuster).

According to K, the lash adjuster operates the valve train with zero lash by using the elastic force and hydraulic pressure of the bulge.
'i? This is aimed at achieving easy driving and maintenance-free operation, and is being used in various types of engines.

7 and 2 show one conventional example of the lash adjuster. This lash adjuster 1 supports one end of a rocker arm 3 that opens and closes a valve 2 of a cycle engine. A keel valve cam 5 is disposed above tl, and the valve system is operated with zero rush from this button.

That is, in the lash adjuster l, a plunger 8 that forms a high pressure chamber 7 between the plunger body 6 and the plunger body 6 is slidably inserted into a bottomed cylindrical plunger body 6 shown in FIG. is urged upward by the resilient portion t4' 9 K, and a stop ring 10 fitted into the upper end of the plunger body 6 prevents the plunger 8 from falling off upward.

The plunger 8 has a plunger body 6 at its upper and lower parts.
Large diameter portions 11 and 12 that slidably fit into the inner circumferential surfaces of the two are respectively cut out, and a space 13 is formed between these two diameter portions 11 and 12.
is formed and has a structure.

The space portion 13 has an outer circumferential edge that is liquid-tightly pressure fitted into the inner circumferential groove 14 of the plunger body 6, and an inner circumference 6 that is liquid-tightly fitted into the outer circumferential annular groove 15 of the plunger 8. , an oil reservoir chamber 17 is defined below the diaphragm 1G in a fluid-tight manner.

Further, the plunger 8 is provided with a communication passage 18 that communicates the oil reservoir chamber 17 and the high pressure chamber 7.
A check valve 19 is provided at the high pressure chamber 7 (lull opening) to prevent oil from flowing from the high pressure chamber 7 to the oil reservoir chamber 17.

The check valve 19 has a ball cage 20 attached to the bottom surface of the plunger 8 defining the high pressure chamber 7 by a stop ring 21, and a check ball 2 inside the ball cage 20.
2 is housed in the building.

The upper end of the plunger 8 is formed into a hemispherical shape so as to be rotatably in contact with the lower end of the rocker arm 3. Further, 23 is a plug 25 f'i? that closes the hydraulic oil injection hole 24 communicating with the OIJ recording/delay passage 18. R
This is a communication hole that connects the upper part of the space 13 to the outside. .

(Constructed in this way) also has a lash adjuster 1il.

When a trap gap (lash) is about to occur, such as between the rocker arm 3 of the valve train and the 1IiII valve cam 5, the plunger 8, which is biased upward by the bow intermediate member 9, is moved upward. , absorb this gap. Further, as the plunger 8 moves upward, the oil in the reservoir chamber 17 flows into the high pressure chamber 7 through the communication passage 18, and the check valve 19 prevents the flow in the opposite direction. , for
The entire lash adjuster 1 becomes stiff as appropriate and transmits the operating force of the valve drive cam 5 to the valve 2 via the rocker arm 3. A portion of the hydraulic oil is returned into the oil reservoir chamber 17 through the gap between the plunger body 6 and the plunger 8, such as when the lash adjuster 1 is kept in a compressed state for a long time.

However, with such a lash adjuster,
As for diaphragm locking, there are holes on the inner circumferential surface of the plunger body 6 and on the outer circumferential surface of the plunger 8, respectively. rH
4, 15 had to be formed, and the processing was very difficult. In addition, an expensive diaphragm is used as the seal (1) I material, which has the disadvantage of increasing the overall cost.

The present invention has been made in view of the above circumstances, and there is no need to provide an annular groove in the plunger body or plunger for locking the seal part, and the plunger body and plunger can be easily processed using a simple machining pressure. It is an object of the present invention to provide a closed type hydraulic lash adjuster which can be used as a seal at the end of the girder, and which can reduce the cost without any trouble.

Hereinafter, an example of the present invention will be described in FIG. 3 and V1.
, 41. Note that this is the same as the conventional example shown in the figure.
ii are given the same reference numerals and their explanations will be omitted.

As is clear from the figure, the plunger 31T/i of this embodiment has a t1' configuration from the lower plunger 32 and the upper flange 33.
337t1 The upper plunger 32 has a shape 1i1+S i and a concave lXB54 on the upper plunger 33 Tψ:l
'4 is 11-person JL ((, it is said to be one weight.

Then, the upper plunger 33 and the inner peripheral surface of the 11 plunger body 35 are fitted with Jl'l iF・b flexible KIIJ.
] The large f) part 36 is pulled, and the large diameter i7i! 37, a seal link 38 with f;
The seal ring 38 is inserted so as to be movable up and down with an appropriate tightening margin so as to fit liquid-tightly onto the outer peripheral surface of the small diameter part of the seal ring 38.
is defined. The oil reservoir chamber 17 is bored in the lower plunger 32 and the upper plunger 33.
, 91. through the communication path 39°40. It is communicated with the compression cord '7. Also, the seal ring 38 and the large 1r portion 36 of the amplifier plunger 33! : Between ttll14
41 is inserted, and by kneading, the seal ring 38 is pushed downward by a small amount in the figure.

The lash adjuster 113 formed in this way
When a gap is about to occur between the rocker arm and the valve drive cam, the plunger 31, which is pushed upward by the resilient member 9, is moved upwards.
・、11 t、Absorb this moment (see Figure 1)
.

1. With the upward movement of the plunger 31, the oil resurpa≦
Made in I17! 11 oil is connected, via direct route 39.40! 1. Pressure 2<, 7 flows in and is prevented from sliding in the opposite direction by the Ot1 and 3yt stop valves 19.
The entire lash adjuster IB is rigid with a length of 1 to 11, and transmits the operating force of the valve operating cam to the valve via the rocker arm 17.

Further, when the plunger 31 moves up and down with respect to the plunger body 35, the mail reservoir ff1l? The 77 volumes of the high-pressure chambers 7 and 7 are vaporized by different amounts of 1j1, but the changes in volume between the two are absorbed by the vertical movement of the seal ring 38.

In addition, in the above examples, 11 of the present invention is L)OIICi
NW describes an example applied to the IIIJ valve mechanism, but it is not limited to this (,0IIC type or 0
1 (This invention applies to V-type valve train 4tR as well as 7j'j iil
It is Noh.

As explained above, according to the present invention, a seal ring is freely disposed between the outer circumferential surface of the plunger and the inner circumferential surface of the flansha body, and as the plunger moves up and down. Since the change in the hydraulic oil filling space is absorbed by the movement of the seal ring itself, the sealing member and the thick-walled diaphragm as shown in the conventional example are not used. A seal ring can be used to improve durability.

In addition, since the seal ring is biased by the resilient member in the direction where the hydraulic oil filling space becomes narrower, even if the plunger moves 1/IJ and the hydraulic oil filling space changes to become narrower, This change can be quickly responded to, thereby preventing air from entering the hydraulic fluid. Furthermore, as mentioned above, the seal ring is damaged by the elastic member to apply appropriate pressure to the oil, so the check valve TP valve can be manufactured quickly! FiJ1 can be increased, and responsiveness can be improved by 1.

Furthermore, there is no need to provide an annular groove in the plunger body or plunger for sealing (for locking the illumination material).
tR1 A plunger body and a plunger can be obtained by simple machining, and a seal ring with a simple structure can be obtained with a reduced number of parts.
Therefore, the cost can be reasonably reduced by 1τ.

In addition, by using a sealing member having an X-shaped cross section as the seal ring, it is possible to improve the sealing performance, and there is an effect that the reliability can be further improved.

[Brief explanation of the drawing]

Fig. 7 and trJ co(91 shows a conventional example of a lash adjuster, Fig. 2 is a schematic configuration diagram of the entire valve, Fig. 2 shows a vertical 111 side of the lash adjuster [21
Figures 1, 3 and 3 show one embodiment of the present invention, in which Figures 2 and 3 are vertical views, and Figures μ are explanatory views showing the state in which the flange is extended. 1B...Lash adjuster, 7...
High pressure chamber, 17...Oil reservoir chamber, 19...
...Check valve, 31...Plunger, 32.
...Lower plunger, 33...Upper plunger, 35...Francia body, 37.
・・・・・・! 2 +11i section, 38...Seal ring, 39...Communication path, 40...Communication path, 41...S11 shot) 1b ring. 1 person Hon IB Gimoe Kogyo Co., Ltd. 3; ~ 1 +'
4 Fig. 2 2 31j; 7f noon, /1 [port 1 3

Claims (1)

[Scope of Claims] 1) A bottomed cylindrical plunger body, a lower plunger that is slidably fitted into the plunger body and forms a high pressure chamber between it and the bottom of the plunger body, and the lower plunger 1) Old “
; The upper plunger forming 6 is inserted in the space 011 so as to be slidably and in close contact between the outer circumferential surface of the upper plunger and the inner circumferential surface of the plunger body; a seal ring forming a mail reservoir chamber, a communication passage bored in the lower plunger to communicate the oil reservoir chamber and the high pressure chamber, and -El of the communication passage;
A check valve is provided in the ls to allow hydraulic oil to flow from the oil reservoir chamber to the high pressure chamber. A closed type hydraulic lash adjuster comprising a resilient member for biasing. 2) The sealed hydraulic lash adjuster according to claim 1, wherein the seal ring has an X-shaped cross section.