JPS58167813A - Poppet valve spring retainer with machine /hydraulic regulating mechanism for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The device of the invention lies in the field of pulp adjustment mechanisms for internal combustion engines with overhead cams or rocker arms, and more particularly in the field of pulp adjustment mechanisms for internal combustion engines with overhead cams or rocker arms, and more particularly in the field of pulp adjustment mechanisms for internal combustion engines with overhead cams or rocker arms, and more particularly in The present invention relates to a pulp spring retainer including a mechanism for adjustment of the pulp spring retainer, as well as a hydraulic embodiment thereof.

In a typical overhead cam engine, the pulp is actuated by a rocker arm pushing the pulp stem or a camshaft pushing the packet tappet. The rocker arm is normally actuated by a cam disposed in association therewith. A gap is typically provided between the pulp stem and the rocker arm to accommodate thermal expansion of the pulp stem due to heat generated by fuel combustion within the engine. Adjustment of most of this gap is accomplished through the use of locking screws or shims placed within the packet member located above the pulp spring retainer. Such adjustments are relatively simple, but often require the camshaft to be removed from the vehicle in order to place the shim in place under the packet. In other systems, the packet is adjusted by a threaded member threaded at an angle across the top of the pulp stem, and when the threaded member is rotated upward, the packet rises and the threaded member is rotated downward. When rotated, the packet is adapted to descend.

The gap adjustment device related to the device of this invention is Adol.
No. 9722.2C1 to ph Vents. This system utilizes a threaded pulp stem and provides an adjustment mechanism onto which a nut-like member is rotatably screwed. In such a system, when the nut is rotated for adjustment, the pulp stem Means shall be provided to prevent rotation of the

One object of the present invention is that it is substantially lighter in weight than those used in the current art, is significantly smaller for its weight, and requires less than 5 to 4 elements currently utilized to achieve the same adjustment. To provide a device for adjusting the gap between a pulp stem and a rocker arm that can replace and remove the direct operating point of the pulp stem from its top to reduce stress on the pulp stem and lighten its weight. That's true. Another object of the invention is to ensure that the compressive resistance of the pulp spring is not transmitted directly to the top of the pulp stem as is currently done in the prior art.

The device of the present invention provides for the retention of outer and inner valve springs used in engines with a pulp spring retainer pace which fits over the pulp spring and has an opening through the central portion for receiving the pulp stem. It consists of a lip mechanism for The pulp spring retainer base further has an internally threaded central portion and an internally threaded upwardly extending outer portion. An outer pulp spring lip member disposed below the outer threaded portion of the pulp spring retainer base fits onto and retains the outer pulp spring. The lock bolt receiver has an opening along the periphery of the upper portion of the outer portion of the pulp spring retainer base, the function of which will be described later. A pulp adjustment cap is also provided having a central protrusion at its bottom having a thread on its outer portion for threaded engagement into the inner threaded portion of the pulp spring retainer base. The pulp adjustment cap has a threaded portion around its outer periphery adapted to be engaged into an outer threaded portion of the pulp spring retainer base. The top of the pulp adjustment cap has a polygonal, in a preferred embodiment ~hexagonal, section adapted to engage a wrench for rotation within the pulp spring retainer base. A locking bolt is provided with a cap locking member having an opening for the locking bolt to pass therethrough. The cap locking member has a lip member adapted to engage into selected ones of a plurality of apertures disposed along the periphery of the pulp adjustment cap, and the cap locking member has a lip member adapted to engage into a selected one of a plurality of apertures disposed along the periphery of the pulp adjustment cap to adjust the gap between the pulp stem and the rocker arm. When the pulp adjustment cap is rotated to its desired height within the pulp spring retainer base, the pulp adjustment cap positions the cap locking member with its lip engaged within the opening of the valve adjustment cap closest to the valve adjustment cap. This locks it into place.

A locking bolt is then threaded through the opening in the cap locking member, and then a locking bolt receiver on the pulp spring retainer base is threaded through the opening and then secured in place with a nut threaded onto its extension. Inside the central part of the protrusion located in the center of the underside of the pulp adjustment cap,
A region is defined that is adapted to receive a pulp stem spring member and a pulp stem bushing that fit therein. The pulp stem bushing has a projection on one side thereof that engages the pulp stem spring member.

The pulp stem bushing is adapted to fit into a pulp stem bushing receiving area defined within the pulp spring retainer base. The pulp stem receiving opening defined in the pulp spring retainer base is configured to be slightly narrower at its bottom than at its top.

When the valve stem is placed within the opening, the pulp keeper key is placed in the groove at the top of the pulp stem, and the valve stem is now free to move within the top of the pulp stem recipient opening, but the valve stem recipient It is adapted to prevent it from escaping downward through the opening.

This is because the bottom of the pulp stem receiving opening is narrower than the pulp keeper key located on the pulp stem. When placed on the pulp stem, this key holds the structure of the invention in place on the top of the pulp stem, and the pulp spring is compressed to hold the pulp in an upward position closing its associated port. When the cam or in some cases the rocker arm is activated directly on top of the pulp adjustment cap, the pulp port is opened.

The pulp conditioning cap is supported both at its center and at its periphery, rather than just in one or the other location, to prevent deformation in its center and distribute force loads more evenly on its top surface. It has been found that it is suitable to In operation of this device, the pulp stem rotates to various positions during use, and this rotation is expected to aid in stress distribution. To prevent difficulty in threading the pulp adjustment cap onto the pulp spring retainer base due to misaligned threads between the inner and outer threads, in another embodiment the pulp adjustment cap is made from two pieces. One is an outer threaded ring with a lip for support of the outer portion of the inner cap. This outer threaded ring can have multiple projections extending from its top, and when the cap is screwed into the central thread of the pulp spring retainer base, these projections are grasped with a tool and the outer threaded ring is It can be rotated to raise its lip to provide support around the pulp cap. If the pulp adjustment cap and pulp spring retainer base are to be constructed of aluminum or other light metal that is highly susceptible to wear from rocker arm or cam action, the pulp adjustment cap may also be defined to accept a polygonal hardened steel insert. It can also have an insert opening.

A spring loaded bushing was provided to help hold the pulp in place as the device of the invention was depressed. The spring-loaded bushing further ensures 1111 that the pulp stem moves downward simultaneously or after a very short time after the device of the invention starts its downward movement. Spring-loaded bushings are even more effective, especially when the pulp adjustment cap is adjusted to zero gap.
Allows for possible expansion of the pulp stem. Additionally, the spring loaded bushing helps eliminate some amount of noise caused by the pulp stem directly against the pulp adjustment cap. The spring-loaded bushing can also be pressed down to prevent or minimize upward movement of the pulp stem on its own
Since the depressing force of the pulp cap is not concentrated directly on the pulp stem but on the pulp spring, pressure is maintained on the pulp stem.

In some embodiments, one or more holes are drilled in the pulp spring retainer base and cap to allow oil to circulate within a chamber formed between the pulp spring retainer base and the pulp conditioning cap. Oil circulating through these holes provides lubrication within the chamber and helps reduce noise by filling a relatively wide chamber that is prone to certain resonances. This embodiment also facilitates cooling of the pulp spring retainer base and pulp conditioning cap so that heat from camshaft friction and heat transferred from the pulp head through the pulp stem to the apparatus of the present invention is transferred to their significant This will not cause expansion.

Also disclosed are embodiments of a pulp spring retainer base and pulp adjustment cap member that can be used in conjunction with a hydraulic lifter. No threaded components are provided between the cap member and the pulp spring retainer base because hydraulic lifters do not require the same adjustments that are required with mechanical lifters.

A chamber is provided within the cap member which, when placed within the pulp spring retainer base, is held in place by a semicircular clip that fits within a groove provided in the upper exterior portion of the pulp spring retainer base. Retained. A hydraulic piston is disposed above the pulp stem bushing and a preload spring and ball combination is provided therebetween to capture hydraulic fluid upon downward thrust of the cam or rocker arm. The piston is hollow in its upper portion and has an opening in its bottom aligned with the ball. The ball acts as a hydraulic pulp for the piston, which is directly above the ball located in the bore just above the pressure≠yamba. When the cap member is depressed, the cap member moves the piston inwardly toward the center of its chamber, thereby compressing the oil within the pressure chamber; this action reduces the minimum compressibility of the oil within. provides a means for transmitting movement of the cap member to the pulp spring retainer base. Upon release of the pressure acting on the device of this invention,
Some of the oil is routed rearward through the central hole of the piston from an oil sump formed in the hollow part of the piston and a corresponding hollow part of the cap member. This flow is the return of oil under pressure]
The hole allows oil to enter the sump above the pole when no force is acting on it. The design of the hydraulic embodiment of this invention has advantages over current technology which incorporates the hydraulic lifter into a separate housing drilled into the top of the cylinder head. Hydraulic embodiments of the invention are held in place by the clip on the valve stem and the pressure of the pulp spring acting upwardly against the pulp spring retainer base. This embodiment substantially simplifies the construction of the hydraulic lifters and significantly reduces their weight. The pulp stem bushing acts as a seal and prevents oil from escaping from the pressure chamber down the pulp stem. In some embodiments, the pulp stem bushing can be screwed into place or sealed in place with an O-ring or press-fit cup insert to prevent movement from its seat. In this embodiment, holes are provided in the pulp spring retainer base midway between its outer periphery and its central portion, these holes serve to lighten the structure and allow oil circulation; , as previously mentioned, reduces noise from resonance, and the hole acts as an oil sump from which the pressure chamber draws oil for its proper operation.

It should be noted that in this embodiment there is an additional oil sump, and oil is still provided to the pressure chamber C by trapping the pulp sp, when the motor is to be operated with a low amount of oil. be.

Another embodiment of the hydraulic version of the invention utilizes a hardened steel upper cap member and an aluminum lower cap member with a sump defined therein. Below the sump is a hardened steel cup member with an opening defined therein. No bushing is used, but a second hardened steel cup member is disposed within the pulp spring retainer base and includes a hollow piston member. Within the upwardly directed hollow is a spring cap and a pawl that control the inflow of oil from the sump.

In FIG. 1, a pulp spring retainer base 10 has an outer pulp spring retaining lip 12 projecting from its bottom portion, into which an outer pulp spring 20 is engaged. This figure also shows the inner valve spring lip 4 where the inner pulp spring 18 engages and the pulp stem receiving opening 16 where the pulp stem enters.
can be seen. The opening 16 is slightly narrower at its bottom than at its top and serves to engage the pulp stem by means of a small clip inserted into a groove in the top of the pulp stem. The pulp stem has been omitted from this figure since such pulp stems and clips in grooves are well known in the prior art and are used in the prior art to hold pulp spring caps in place. A valve stem bushing receiving ledge 52 can be seen in the central portion of the pulp spring retainer base 10. The protrusion 21 is centrally located above the pulp stem receiving opening and has a threaded portion 22 along its inside.

Pulp spring retainer base IO has an upwardly extending portion 23 along its periphery, and portion 23 has an internally threaded portion 211 along its interior.

As shown, a pulp adjustment cap 26 is threaded onto the pulp spring retainer base 10, and the cap 26 has a hexagonal member 3 on its top to facilitate its rotation.
2, which will be described below in connection with the pulp spring retainer base IO. In such a pulp spring retainer base, the cap receiver can be configured as an insert into the opening 33. A portion of the pulp adjustment cap 26 protrudes downwardly at the central portion, and its screw 27 engages the central threaded portion 22 of the pulp spring retainer base IO. The outer portion of the pulp adjustment cap is also threaded to allow vertical adjustment when rotated within the pulp spring retainer base 10. The pulp adjustment cap has a separate externally threaded ring portion 35 with a lip 37.
The lip 57 is adapted such that the pulp conditioning cap is supported by the lip around the periphery of the cap. A plurality of three adjustment lugs protrude from the threaded ring portion.When the cap is centrally threaded, the adjustment lugs can be adjusted by grasping and rotating the adjustment lugs with a tool designed to engage the lugs. , the threaded portion 35 may be adapted to be retrograde against and support the cap. Also seen in FIG. 1 is a lock bolt 36 which passes through a cap lock member 38 and into a lock bolt receiving opening 3 defined in the valve spring retainer base 10. The cap lock member is disposed within a selected one of a plurality of cap lock member holes IIO found in the valve adjustment cap.

The valve stem bushing 116 is provided to rest on its ledge 52 within the valve spring retainer base, and the spring member 115 is adapted to engage the protruding portion 47 of the valve stem bushing and the projection 42 of the valve adjustment cap above it. to maintain pressure on the valve stem as described above. A plurality of openings 50 are provided in the valve spring retainer base and adjustment cap member to permit oil flow therethrough.

In the hydraulic embodiment of the invention, as seen in FIG. 2, the pulp spring retainer base 60 has a shape similar to that of the pulp spring retainer base of the mechanical embodiment, but The difference is that the central portion 62 and outer portion 64 of the retainer base are not threaded. Retainer cap 66
It is held in place by a retainer clip 68 that is disposed within the Fi pulp spring retainer base and fits into a groove 70 in the pulp spring retainer base 60. In the first embodiment the valve stem bushing 72
The pulp stem receiver is disposed on a ledge 74 above the open aperture with a piston 78 disposed thereabove, the piston 78 being positioned within a pressure chamber 80 formed by a protrusion 82 extending from the pulp spring retainer base 60. are doing.

A pawl member 84 and a play 86 are arranged below the piston, and a spring member 88 is arranged below them. At least one opening 90 is provided to allow oil to enter the oil sump 81 for the hydraulic operation described above and at least one □-opening 92 is provided to allow oil to enter the pulp spring retainer base 60 and cap 66. It is arranged to make it easier to read.

A second hydraulic embodiment is shown in FIG. 5 which utilizes a hardening cap 91 on a lower cap 92 with an oil sump 94 defined therein and an oil inlet opening 96.
is provided to allow oil to enter the oil sump.

No bushings are used and this embodiment has an upper hardened steel cap 100 with an opening 106 located below the sump and a lower hardened steel cap 102 located above the opening 101 of the valve stem receiver. cap 1
There is a hollow piston 1014 within 02. A pole 10 aligned with the opening of the top cap 300 within the upwardly facing hollow portion.
There are 8. A cup 110 and a spring 112 are located below the pawl 108, and the spring 112 extends to the inside of the hollow piston 1oII.

FIG. 4 shows a cap member 200 made of solid material.
2 shows another embodiment of the device of the invention, having: It is noted that the pulp spring retainer base and bushing can be constructed from aluminum or other lightweight metal, and the cap member can be constructed from the same material or from materials such as hard steel as described above for wear resistance. Should.

FIG. 5 shows yet another embodiment having a cap member with a circular top 300 defining an opening 302 for receiving the protrusion of a rotating tool. In this embodiment, only the central portion of the engagement between the cap and the valve spring retainer base 304 is threaded, and the peripheral area 306 is free of threads or other engagement means.

This embodiment is useful, for example, when using a rocker arm that only hits the central portion of the cap member.

FIG. 6 shows yet another embodiment having a cap member that is threaded only on the periphery. This embodiment is particularly useful for small retainer members such as those used in motorcycles and other small engines.

It should be noted that the use of the adjustable valve spring retainers of the present invention has many advantages, in addition to their compact and lightweight construction, which accomplishes similar functions in the prior art. It is. One advantage is that the pulp spring retainer cap can be set with a smaller gap or zero lash than is possible with current gap adjustment devices, eliminating the significant problem of pulp head being forced into the pulp chamber upon thermal expansion of the pulp stem. This should not occur. The gap above the bushing allows the stem to expand into the gap by its upward movement. Because the bushing in the mechanical embodiment is not rigidly held in place, the pulp stem can move slightly into the pulp stem retainer of the present invention. This movement also allows the combustion chamber pressure to aid in pulp closure. That is, the combustion chamber pressure forces the pulp upward only against the very weak pressure of the pulp bushing spring, thereby sealing the combustion chamber. If the bushing is constructed of a soft material and the bore in which the bushing is located is of the same dimensions as the pulp stem receiving opening, the pulp stem retainer of the present invention will be able to handle the problem when the engine over-revs and the piston hits the pulp head. When the pulp stem hits the case, its deformation gives an advantageous place of movement. This breaking or deformation of the bushing dissipates breaking forces, minimizes pulp damage, and thus facilitates repairs to the device of this invention without requiring pulling the head away from the engine to reach the damaged pulp. can be done.

Although the invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that many changes and modifications may be substituted without departing from the principle or spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective cross-sectional view of the apparatus of the invention incorporating a mechanical starter. FIG. 2 is a cross-sectional perspective view of the apparatus of the present invention utilizing a hydraulic lifter. FIG. 5 shows another embodiment of the hydraulic type. FIG. 4 is an embodiment with a solid cap; FIG. 5 is an embodiment with a circular central threaded cap. FIG. 6 is an embodiment with a peripheral threaded cap. 10. Pulp fly retainer base, 12.11
1. Lip, 16. Valve stem receiver opening, 18.
20...Pulp spring, 21...Protrusion, 22...Threaded part, 24...Inner threaded part, 26...Pulp adjustment cap, '□52...Hexagonal member, 33...Cap holder is open, 35... Externally threaded ring part, 56...
・Lock bolt, 37...Lip, 38...Cap lock member, 59...Adjustment protrusion, 110...Cap lock member hole, 115...Spring member, lI6...Pulp stem bushing, 50...Oil flow opening, 60... Pulp spring retainer base, 66... Retainer cap, 68... Retainer clip, 72... Pulp stem bushing, 76... Nokuru stem receiver is open, 78...
・Piston, 80・・Pressure chamber, 81・・Oil sump, 84・
-Ball member, 86...Plate, 8g...Spring member, 90.92...Oil flow opening. Drawing seawall (no tr in content) FIG, 1 4 FIG, 2 FIG, 3 Procedure amendment (method) July 6, 1980 Commissioner of the Patent Office Kazuo Wakasugi L. Indication of the case 1988 Patent Application No. 1I9258a Name of the invention (device), product 0≠minute5, relationship with the case of the person making the amendment Patent applicant fJ (name) Alfriend A. Frack 4, agent

Claims (1)

Claims: L. A device for adjusting the gap between a pulp stem and its operating mechanism in an internal combustion engine, the pulp spring retainer member being adapted to be held on the pulp stem; and a dual adjustment mechanism incorporated into the valve spring retainer member for adjusting the gap between the actuation mechanism and the device. a lower pulp spring retainer member with a pulp stem receiving opening defined therein; a lip mechanism for retaining the pulp spring; a cap member; a first portion of the gap between said cap member and said actuation mechanism (cam and/or rocker arm); 2. The apparatus of claim 1, further comprising: a mechanism for adjustment of the cap member associated with the valve spring retainer member for adjustment and a second adjustment of the gap between the pulp stem and the cap member. a pulp stem receiving opening of the valve spring retainer member is adapted to hold the pulp stem and restricting protrusion of the pulp stem into the pulp stem receiving opening by the cap member; 3. The apparatus of claim 2, further comprising a mechanism for allowing thermal expansion and reciprocating movement of the pulp stem. 4. a pulp stem receiving opening of the valve spring retainer member adapted to retain the pulp stem, and a lip mechanism incorporated into the pulp spring retainer for retaining the inner pulp spring member; an outer, upwardly extending internally threaded portion incorporated into the pulp spring retainer; a central, upwardly extending internal thread incorporated into the pulp spring retainer, the inner portion of which defines a bushing ledge; a bushing member having a central protrusion defined on an upper side and disposed on the bushing ledge; a lock bolt receiving aperture defined in a periphery of the upwardly extending portion of the pulp spring retainer base; a pulp adjustment cap including a mechanism for retention of the pulp spring retainer base, the mechanism adapted to allow upward and downward adjustment of the pulp adjustment cap within the pulp spring retainer base; and; a spring member disposed between the valve bushing and the pulp adjustment cap; 5. The apparatus of claim 4, wherein the pulp adjustment cap includes a threaded outer portion and a threaded central projection, both adapted to engage a threaded portion of the pulp spring retainer member. . 6. said pulp adjustment cap comprising an outer threaded ring member adapted to threadably engage an outer threaded portion of said pulp spring retainer member, the lip of said inner periphery of the ring and the center of said pulp spring retainer member; a cap member having an inner threaded portion adapted to engage the threaded portion, an outer periphery thereof adapted to rest on the inner lip of the outer threaded ring member, and the outer threaded ring member; 5. The apparatus according to claim 4, further comprising a mechanism for rotating the pulp adjusting cap independently of the pulp adjusting cap. 7. a plurality of apertures defined within the outer periphery of the top plane of the pulp adjustment cap and selection of the apertures to lock the pulp cap in place and prevent rotation of the pulp cap within the pulp spring retainer member; 7. Apparatus according to claim 4 or 5 or 6, further comprising a locking mechanism adapted to engage into an object. 8. An operable projection is disposed within a central portion of the pulp adjustment cap to facilitate rotation of the pulp adjustment cap within the pulp spring retainer member. The device according to paragraph 6 or paragraph 7. 9. The apparatus of claim 8, wherein said protrusion is a member insertable into an opening defined in said pulp conditioning cap. 10. The adjustment mechanism of the cap member associated with the pulp spring retainer member incorporates a hydraulic system, the hydraulic system retaining the cap member within an upper portion of the pulp spring retainer member; a ring clip; a sump defined within the regulating cap; a pulp bushing mounted above the pulp stem receiving opening; a pressure chamber defined above the valve bushing; a sump disposed within the pressure chamber and extending upwardly to the sump. an extending piston member having a hollow section in an upper portion; a pole member disposed below the opening of the piston; a cup member disposed below the pole member; a cup member disposed between the cup member and the pulp bushing. 3. The apparatus of claim 2, including: a spring member; an opening mechanism defined in the pulp spring retainer member and the cap member to permit entry of oil into the sump; IL: a ring clip in which the adjustment mechanism of the cap member associated with the pulp spring retainer member incorporates a hydraulic system, the hydraulic system retaining the cap member within an upper portion of the pulp spring retainer member; further defining an oil sump including an upper portion constructed from a material such as hardened steel and a lower portion constructed from a material such as lightweight aluminum, and having an inlet/outlet opening for the inflow of oil; a lower cap member disposed above the receiver opening; a piston member disposed above the lower cap member having a hollow portion defined in its upper portion; an upper cap member disposed below within the pulp adjustment cap; a ball member aligned below the opening of the upper cap member; a cup member disposed below the ball member; and below the cup member. 3. The apparatus of claim 2 including: a spring member disposed within and extending into and in contact with the hollow portion of said piston member.