JPS60122205A - Hydraulic type tapet for adjusting clearance - 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 Field of the Invention The present invention relates generally to hydraulic clearance adjustment devices, and more particularly to lightweight adjustment devices for use in direct-acting valve systems.

[Conventional technology]

A direct-acting valve device uses a tappet that contacts the engine camshaft at one end and the combustion chamber valve stem at the other end. Direct-acting valve systems do not have rocker arms and/or shock rods, so they have the advantage of being lightweight, having fewer parts, and being more rigid. Due to its light weight and high rigidity, it has a high natural frequency, making it difficult to make mistakes in movement even at high speeds. Direct-acting valve systems also have a greater ability to control the movement of a given valve than other types of valve systems.
The load on the valve spring can be reduced in response to engine turns and engine speed. Because it is lightweight and has high rigidity,
As the valve opening/closing speed and acceleration can be increased, the area covered by the valve lift curve can be increased, and therefore the specific power of the engine can be increased. Similar valve opening/closing speeds/accelerations can be obtained with other overdrive cam systems, but the advantage of direct-acting valve systems is that when the cam lift rotates, the surface in contact with it can rotate, which is similar to the rocker arm type. This is not possible with other valve devices. Therefore, in the direct-acting valve device, the contact pressure of the cam device can be increased.

Furthermore, in other over-rad cam type valve devices, when opening/closing acceleration and speed are large, the cam lobe profile becomes more complex than in the case of a direct acting type. With a direct-acting valve system, the cam profile can be made simpler even when high opening/closing speeds/accelerations are desired, resulting in fewer manufacturing problems and lower costs.

In a direct-acting valve system, the tappet is seated in a guide hole in the upper part of the combustion chamber of the engine and reciprocates within a film of engine lubricant that is supplied thereto. The tappet of a direct acting valve system must be of sufficient diameter to accommodate the valve spring and have an appropriate list value. Therefore, the tappet of a direct acting valve device generally has a length/diameter ratio of about 1.

When the tappet housing pull is made of cast iron, the body of the tappet can be made of a suitable ferrous material or steel alloy to match the hardness and thermal expansion properties of the guide pull.

[Problem that the invention seeks to solve]

However, a long history of research has led to the realization of tappets for direct-acting valve systems made from materials that are substantially lighter than steel, yet have similar durability and wear resistance. It's about finding a way to do it. If the tappet is lightweight, a larger opening/closing acceleration can be obtained for a given valve spring load.

When the cylinder head of an engine is made of aluminum, the tappets of such a direct-acting valve device are designed to absorb the wear characteristics of the aluminum cylinder head so that excessive oil flow does not occur at the operating temperature of the engine. It is desirable that the material matches the thermal expansion characteristics. Tappets made of iron or steel provide the necessary durability and surface abrasion resistance, but have a substantially lower coefficient of thermal expansion. Therefore, if the iron or steel tappet is properly dimensioned relative to the tappet guide bore when the engine is cold, then under normal operating temperatures of the engine the tappet will be inside the guy F'' tare. Yurui becomes ′=!shiai.

Conversely, if the iron or steel tappet is dimensioned properly for the tappet guide port of the aluminum cylinder head under the normal operating temperature of the Ennon, there will be a striped fit relationship at room temperature. Assembling becomes impossible. If the cylinder head is assembled with an appropriate gap when the cylinder head is at normal operating temperature, then when the ennon cools down, the tappet will be gripped by the guide pore.

It has therefore been desired to find a way to realize a hydraulic clearance adjustment tappet for the sump of Ennon's direct-acting valve system in which the cylinder head is made of aluminum or a similar lightweight material with a high coefficient of thermal expansion. .

In addition, the cylinder head of the engine is made of aluminum, and the direct-acting valve device has a hydraulic clearance adjustment valve that can work in contact with the camshaft, which is made of hardened iron-based material. The way to realize
It has also been desired to find out. What is generally required for this is that the cam surface of the lightweight glue rod match the hardened surface of the cam rope in terms of hardness and abrasion resistance. Furthermore, it has been desired to find a way to regulate the leak-down clearance in such a hydraulic clearance adjusting jet in an economical and convenient manner while making the body lightweight.

[Failure to solve the problem]

The present invention provides a body of Yuhata for hydraulic clearance adjustment used in a valve device of an internal combustion engine.
Many of the above-mentioned problems in the conventional technology can be overcome by using a molded material such as plastic or aluminum that has a coefficient of thermal expansion of 22 x 10 pes''C or higher between It is something to be overcome.

The body has a face member joined by molding, which forms the working surface that contacts the cam lobe during actuation.

Also, a hydraulic clearance adjustment device that has a second reaction surface that is ultimately movable within the body and that comes into contact with the part that is integrated with the engine valve when activated. There is. During operation, movement of this second reaction surface relative to the reaction surface of the face member causes adjustment of the valve system valve.

This construction has the advantage of making a hydraulic clearance adjustment device extremely lightweight and inexpensive, which operates satisfactorily in the normal internal combustion engine environment.

The present invention, in accordance with its preferred embodiment, provides a hydraulic clearance adjustment tappet of the type used in direct acting valve systems of high speed internal combustion engines. This hydraulic plank tie according to the invention is of the type commonly known as a bucket tie, i.e., the diameter of its body is substantially larger than the diameter of the hydraulic plant fit therein. belongs to. A portion of the body of the tappet according to the present invention, which accounts for a large portion of its mass, is provided on an aluminum cylinder head and has an outer circumferential surface that is accommodated in such a way that it can directly contact and rise in the cylinder head. The tappet according to the invention has a hydraulic clearance adjustment device in the form of a steel plunger piston structure, in which a one-way valve and a pressure oil chamber are used for clearance adjustment.

Within the plastic body, a chamber of pressurized oil is formed in the area around one end of the silant piston mechanism. The tappet according to the invention has a face member made of alloy steel at its cam contact surface to provide wear resistance that matches the ferrous hardened working surface of the engine cam. This face member bar is generally cup-shaped and is embedded in the body when malting it. This construction allows the tappet to work up in the guide bore, and also allows the tappet to match the thermal expansion characteristics of the aluminum cylinder head to maintain an appropriate gap between the tappet and the guide bore. By doing so, it becomes possible to achieve the necessary directional control and lubrication between the upper nine surfaces without causing an excessive flow of oil even at high temperatures.

The body of the tappet according to the invention has a generally biannular outer wall part, a hub part located on the inside thereof at a distance from the outer wall part, and a flared end face part laterally connecting the hub parts. The hub has a web extending radially inward from the outer wall and supporting the hub. The hydraulic syringe and piston assembly is housed within the hub section 9, with an oil reservoir defined between the inner surface of the web, the end of the piston, and the inner circumference of the hub. This unique structure allows the tappet body to have a relatively large diameter on the outer circumferential surface, while providing manufacturing convenience in that the outer wall, hub, and web can be integrally molded. The hydraulic clearance adjustment device is preassembled and then inserted into the hub and retained there.

In this unique construction of the Yuha cutter according to the invention, a sump surface for strictly regulating leakage down can be formed between the piston of the clearance adjustment device and the plunger by a part made of iron or steel. By using the intermediate 70 lantern, a lightweight body can be put to practical use within the normal operating temperature range of the engine. The present invention thus matches the cylinder head material of aluminum with Ennon's hardened iron-based camshaft (!), which functions in contact and has a leak-down surface with suitable wear resistance. The problem can be solved by providing a lightweight tappet for a direct acting pulp machine.

In many embodiments of the present invention, various shapes of the face member are shown, and in which the skirt portion of the face member may be uniform over the entire circumference and may be made of material of the body. It may have a notch forming a retaining surface which acts to prevent relative movement between the two. The skirt portion is generally circumscribed and connected to the disc-shaped face portion of the face member, and may be embedded in the outer wall of the body or in the annular groove portion. Finally, the face of the face member is substantially aligned with the nominal cross-sectional area of the annular outer wall to maximize the area available for contact with the cam. (Margin below) [Embodiments] The features and advantages of the present invention described above and other features will become clear from the following detailed description of several preferred embodiments of the present invention with reference to the drawings.

For a detailed description of embodiments of the invention, reference is made to the description of the drawings.

In the figure, hydraulic clearance adjustment tappet 10
is reliably accommodated in a kite pore 12 provided in a cylinder head 14 of an internal combustion engine 16. One cam loaf 20 per camshaft 18 is in contact with the upper surface of the tappet or cam contact surface 22.
The combustion chamber valve 24, which has a normal structure, is shown in the figure in a position where it touches the valve seat surface, and the stem portion 26 of the valve is located in a position where it is in contact with the valve seat surface. The upper end 30 of the stem portion extends substantially vertically upwardly through B, with the upper end 30 of the stem contacting the lower end surface of the tappet.There is a valve spring 32 which biases the valve toward its closed position; Valve guy +: is received on the outside of the upper end portion of 28, and the upper end is in contact with a retainer 34. This retainer is attached to the upper end of the valve stem by a suitable method such as using a two-piece keeper 36. , fixed J%.Such a structure belongs to the known art.The supply of pressure oil to the tappet IO is carried out by connecting the corridors 3B and 38 and the guide hole 12 from a pressure oil source (not shown). Connecting channel 4
It is done through 0.

Figure 2 shows a typical packet tappet according to existing technology made entirely of steel.
A steel or iron cap 42 is joined to a mild steel body 44 by welding at a solid joint 43. Regarding this type of assembly, the existing technology U, S patent 4
, 270, 496.

3, 4, and 5 show a tappet IO according to a preferred embodiment of the present invention. The body apparatus, which is designated as 46 in its entirety, is
Preferably, it is integrally formed as shown in the figure, with an end wall 50 extending radially inward from the inner surface near the upper end of the tubular outer wall 48 and perpendicular to the axis (see FIG. 4).
A tubular huff 52 extends axially downwardly from the end wall 50, preferably integral therewith. This end wall 50 is a partition wall that prevents the hydraulic pressure applied to the inside of the hub 52 from reaching the cam contact surface 22 of the face member 54. The cam contact surface 22 is the reaction surface of the face member against which the cam lobe 20 contacts during operation. The inner peripheral portion of the huff 52 is approximately parallel to the outer peripheral surface of the tubular outer wall portion 48. The outer circumferential dimensions of the tubular outer wall portion 48 are determined such that it fits within the tappet force hole 12 (FIG. 1) with approximately no gaps. At least one web portion 56 extends radially outwardly from the hub portion 52 to an inner surface of the outer wall portion 48 for supporting the hub portion 52.

In accordance with the present invention 2 and in a practical manner-1, the outer wall portion 48
, the end wall portion 50, the hub portion 52 and the web portion 56 are 2
Thermal expansion coefficient is at least 22X between 0 and 100°C
It is made by integrally molding a suitable lightweight material with a temperature of 10/unit length/°C. A wear-resistant surface is formed on the outer peripheral surface of the tubular outer wall. The wear-resistant surface may be, for example, anodic electrohard plating (for aluminum bodies) or a high silicon-aluminum alloy surface with a hardness of 8 on the Mohs hardness scale (equivalent to topaz). In the practical manner in which this is currently proceeding, molded in one piece21. The body consisting of the web portion, the end wall portion and the huff portion has a volume density of 285
? Materials smaller than /aJ, such as carbon fiber reinforced plastics, are emerging. The material is 7 grains of carbon fiber,
i' abrasive additives such as Teflon or glass fibers may also be included. It is well known to those who determine the specifications of plastic materials used in high-performance plastics that in order to match the coefficient of thermal expansion of the plastic material to that of the face member 54, it is necessary to add additives. Good to add to plastic materials.

The cam face member 54 consists of a relatively thin disc-shaped face portion 58 and a large annular skirt portion 60 extending in the axial direction from the radially outer end of the face portion 58.

Several radial through passages 62 are formed in the skirt portion 60 at circumferentially spaced intervals. The body 46 is made by injection molding to be integral with the face member 54, and at this time, the material of the body 46 flows into the through passage 62, and stable contact is obtained at the retaining surface formed by the through passage. . Thus, after the lever material has solidified in the mold for the hole 46, the face member 54
and body 46 are permanently coupled to prevent movement therebetween. In this preferred embodiment, the retaining surface is formed by a retaining surface or bore or through passage 62, but as will be explained below, the retaining surface can take many forms within the spirit of the invention. In the proposed approach, the cam face member 54 has a volumetric density of 7.5 g/Cft or more and the reaction surface has a minimum effective depth of 0.012 inches (0.3 ms) or more at the cam contact surface 22. The hardness of Niwa 1 is low on the Rockwell 15 IN scale (both 89
It is made of materials that are. However, it should be noted that materials with a volume density smaller than 7.5 f/ca can also be used as the cam face member if the surface hardness is the same.The cam face member 54 is preferably made of a material with corrosion resistance, for example. It is made of alloyed steel with the necessary amount of chromium added to make it durable, although suitable hard ceramic or cermet materials can be used as an alternative if desired. In the 2t approach actually developed in the present invention, the bulk density of the body member 46 is less than 40% of that of the cam face member 54, but any suitable hard, lightweight material may be used for the cam face member. 3"L, the volumetric density of body member 46 may exceed 40% of that of face member 54.

In the hub portion 52 of the body device 46, there are a total of 6
A hydraulic clearance adjustment device indicated by 4 is housed in the hub 52 so as to extend over the inner circumferential surface of the hub 52 without leaving any gaps. The hydraulic clearance adjustment device 64 includes a generally cup-shaped plunger 66 with an open end proximate the end wall 50 and a closed end slightly below the lower end of the axial hub 52. there extends laterally to form a second reaction surface 68 that contacts the upper end 30 of the valve stem portion 26 (FIG. 1). The inner circumferential surface of the plunger 66 has a precision-finished bore 70 whose diameter, roundness, and surface finish have strict tolerances. Within the plunger 66 is a piston 72 in close close contact therewith, the outer circumferential surface of which is tightly defined to regulate leak-down oil flow between it and the plunger bore 70. To create a gap,
Its dimensions are cut to match the plunger's bore 70. The piston 72 is generally cup-shaped with its open end facing upwardly adjacent the end wall, 50, of the housing member 46 and defining an interior cavity 74 from which a passageway 76 extends vertically downwardly into the piston 72. It penetrates the closed end wall of. A one-way valve in the form of a check ball 78 is connected to the passage 7.
6, and the peripheral edge 80 serves as the valve seat of the check valve 78. This check valve is a cage 8 attached to the lower end of the piston 72.
It is held at 2. A spring 84 is located between the cage 82 and the check ball and presses the check ball 78 against the seat 80 to close the check valve.

The inner peripheral surface of the hub portion 52 of the body 46 has an annular relief portion 86 near its upper end or end on the end wall side, into which hydraulic oil enters. At least one bypass passage 88 is preferably provided emanating from the annular relief 86 and leading to the cavity 74 in the piston 72, which provides access to the oil reservoir for supplying the check valve 78. This is to allow the hydraulic oil to flow from the oil storage chamber through the passage 76 in order to be separated. The web portion 56 extends radially inwardly from the outer wall portion 48 to the hub portion 52 and includes a hydraulic fluid passageway 90 therein which is connected to the annular relief portion 8.
6 is connected to a relief part or groove 92 for collecting hydraulic oil provided on the outer peripheral surface of the tubular outer wall part 48 of the body 46.

While the engine is running, the valve 24 is biased toward the closed position by the spring 32, and when the camshaft 18 rotates in synchronization with events in the combustion chamber and is in the position shown by the solid line in FIG. The top surface of 10 coincides with the base circle of the curve of cam lobe 20, where the top surface of the tappet or cam contact surface 22 makes no contact. The camshaft 18 rotates and the cam lobe 2
1, the cam lobe 20 contacts the top surface 22 of the tappet and pushes the tappet downward to the position shown by the dashed line, opening the combustion chamber valve 24. The camshaft rotates further, and the cam lobe comes to the position shown by the solid line in Figure 1, completing one valve operation and the valve falling back onto the valve seat.

In the embodiment advanced according to the present invention shown in FIG.
It should be noted that various other shapes may be used to reduce the weight of the web portion 56. In this current implementation, the end wall 50 extends across the upper region of the hub portion 52 in a solid manner.

However, if the solid portion of the end wall 50 crosses the hub portion 52, the hydraulic oil between the peripheral edge of the cam face member 54 and the outer wall is sealed, and mechanically the solid portion crosses the hub portion 52. It is not necessary as long as it has a structure that can withstand the force.

During engine operation, when the cam lobe 20 is in the position shown in FIG. The plunger 66 is pushed downward until its reaction surface 68 abuts the upper end 30 of the valve stem 26, thereby clearing the valve assembly of grease.

formed between the closed end of the plunger 66 and the piston 72.
The expansion of the high pressure chamber 98, which is located in the chamber 98, pulls the valve 78 open and away from the valve seat 80, thereby allowing oil to flow into the chamber 98. When the chamber 98 stops expanding, the check ball 78 is closed by the tension of the spring 84. As the cam lobe 20 continues to rotate, the sloped surface of the cam lobe begins to exert a downward force on the upper surface 22 of the tappet 10, which tends to force the piston 72 into the bore 70 of the plunger 66.
The oil trapped in chamber 98 rebels against this. The oil trapped within chamber 98 substantially prevents movement of piston 72 relative to plunger 66 and transmits motion to upper end 30 of valve stem 26 via lower surface 68 of the plunger. As anyone who owns one will understand, a small movement of the plunger 66 relative to the piston 72 occurs, and the degree of this movement is precisely finished and the passage (relief) between the bore 70 and the outer circumferential surface of the piston 72. The piston 72 and plunger 66 thus act as one rigid body, transmitting the effect of further valve lift of the cam lobe 20 to the valve 24, causing the valve to open.

There are many ways to retain the residual clearance device 64 within the hub 52 in the assembled condition. For example, hub 52
A circumferential groove that opens radially inward is provided in the groove, and a snap ring is fitted into the groove to prevent the clearance adjustment device 64 from protruding downward. Alternatively, the hub 52
The lower end of the clearance adjusting device 64 can be deformed so as to extend radially inward to restrict the downward movement of the clearance adjustment device 64 in the same manner as in the above example. Yet another method is U.S. Patent 4.37
There is a method described in No. 3,477. However, a particularly advantageous method for retaining the clearance adjustment device 64 is to use a bottle crown shaped retainer 100, which
What distinguishes the retainer 100 is a plurality of projections 102 projecting radially inwardly from a skirt portion 104 thereof.

When assembling, place the beam retainer 100 over the hub 52 and the concentric position, and push it up until the body part 106 touches the bottom surface of the hub 52. This will cause the protrusion 102 to align with the hub 52.
It bites into the outer surface of the material, forming a bond there that cannot be easily separated. Body portion 106 has an opening 108 therethrough, which opening 108 is of slightly smaller diameter than the bore of hub 62. The lower end of the plunger 66 has a reduced diameter portion in which a shoulder 110 is formed. When the clearance adjustment device 64 is at its lowest position, this shoulder 110 This corresponds to body part 106 of 100. The use of a crown-shaped retainer 100 is attractive, particularly in the preferred embodiment of the present invention, because the plastic body material is relatively soft. In other words, the outer circumferential surface of the hub 52 may be a uniform surface that can be easily molded because the projections 102 can easily bite therein. This option does not require that the hub 52 be machined or molded into a shape to match and receive the retainer, as is the case with other designs. In FIG. 3, the retainer is omitted in order to clearly show the details of the portion covered by the retainer.

FIG. 6 shows an alternative embodiment of the cam face member at 112, which is substantially similar to the face member 54, except that the outer circumferential surface of the skirt portion 60 is shaved. Skirt part 116 and face part 1
A shoulder 114 is formed between 18. In the embodiment of the cam face member shown in FIG. 5, the outer diameter of the skirt portion 60 is made slightly smaller than the outer diameter of the tubular outer wall portion 48, and the outer surface of the skirt portion 60 is substantially entirely covered with a plastic material. It allows you to surround yourself with others. In this case, however, a small portion of the surface area of the cam contact surface 22 remains in sacrificial contact. In the cam puff ace member 112 in the embodiment shown in FIG.
4, thereby making the cam contacting surface 120 of the face member 112 substantially the same size as the nominal cross-sectional area of the outer wall portion 48.

A second alternative embodiment of the cam face member shown generally at 122 in FIGS. 7 and 8 includes face portion 1.
24 and a skirt portion 126. Face part] 2
4 forms a cam contact surface 128, which in this example has substantially the same size as the nominal cross-sectional area of the tubular outer wall 48. The diameter of the skirt portion 126 is less than the diameter of the face portion 124, and it is connected thereto by a downwardly directed, radially tapered passage portion 130. In FIG. 7, the cam face member 122 has a structure that maximizes the size of the cam contact surface 128 that contacts the cam lobe 20, and the heat generated by the body 46 and the cam face member 122 (7) l'13'1. The structure allows for some degree of mismatch in expansion coefficients. In the skirt portion 126, several large four-trapezoidal notches 132 are arranged at intervals on the circumference, and a pair of holding surfaces 134 that fit together are formed therein. Holding surface 13
4 is not substantially aligned in the axial direction, so that when the body 46 is made by injection molding, it will closely embrace the body material flowing into this portion.

In FIGS. 5, 6, and 7, the skirt portion extends substantially parallel to the axial direction of the body 46, but it is preferable for the yacht to have the skirt portion slanted outward or inward for retention in the cam face member 138. In another embodiment of the tappet 10 according to the invention shown in FIGS. 9 and 10, the body is designated as a whole at 136 and the cam face member is designated as a whole at 138. I'm being ignored. For simplicity, the clearance adjustment device is not shown. The housing 136 includes a tubular outer wall portion 140, a tubular hub portion 142, and a plurality of wafer portions 44 arranged at intervals on the circumference so as to interconnect the outer wall portion 140 and the hub portion 142. ing. The cam face member 138 has a face portion 146, and an annular skirt portion 148 extends downwardly from the face portion 146 midway between the radial center and the outer circumference. Hub portion 142 has an enlarged diameter portion 150 to which skirt portion 148 is joined by molding. Several radial passages 152 are formed in the skirt portion 148 at circumferentially spaced intervals, and these are retaining surfaces to which the material of the hub 142 flows during the molding process. Make gentle contact. An oil passageway 90 runs through one of the webs 144 in FIGS.
It passes in the same way as explained in the figure. Skirt part 148
There is a local discontinuity 155 to avoid hitting the passageway 90 where it exists. Once the clearance adjustment device 64 is incorporated, the embodiment of the invention shown in FIG. 10 operates in substantially the same manner as described above.

11 and 12 show a coupe 1-10 in accordance with another embodiment of the present invention, in which the body is indicated generally at 154 and the cam face member is indicated generally at 156.

The embodiment of FIG. 12 is very similar to that of FIG. 4, with the body having a tubular outer wall 158. There is a huff section 1.60 and a plurality of circumferentially spaced web sections 162 interconnecting the huff section 1.60. The body 154 has an enlarged diameter portion 164. Cam face member 1
56 has a face portion 166, and a tubular skirt portion 168 protrudes from the face portion 166 at the same radial position as the outer peripheral edge of the face portion 166. A plurality of radial passages 170 are formed in the skirt portion 168 to increase the diameter of the hole 154 and enter the P portion 164. 170. Figure 9, section i
As in the embodiment of FIG. 12, the operation of the tappet shown in FIG. 12 when looking into the clearance adjustment device 64 is substantially the same as that described above.

〔Effect of the invention〕

As explained above, according to the unique structure of the single tappet, the clearance is adjusted by precisely fitting the piston into the 3% bore formed in the plunger that is accommodated in the hub so that it can slide there. Therefore, there is no need to provide a leak-down regulating surface by precise fitting on the inner circumferential surface of the tapetum hub. An oil chamber that is supplied to a one-way check valve and adjusts the clearance is formed around the planter and in the open area of the tubular outer tube part of the web and housing, and the middle member of the cam face.

The tappet according to the present invention is a unique lightweight tappet with a guide bore surface suitable for direct contact with a Niresin aluminum cylinder head. The outer circumferential surface of the body of the tappet according to the present invention is provided with a hard surface or hard coating that is materially compatible with the aluminum cylinder head and is slidable therein. The tappet is made of a suitable lightweight material whose hardness properties match those of an aluminum cylinder head and whose coefficient of thermal expansion is comparable to that of an aluminum cylinder head.
'L', it maintains the gap between them properly, guides the reciprocating movement of the tappet without any trouble, and maintains a proper film of lubricant in the gap. .

The tappet according to the present invention is made of a hardened iron-based material, and the cam face member of the engine is made of a hardened iron-based material by joining the cam face member to the body with a mold knob. A drive surface with wear resistance matching the above can be obtained.

The foregoing description of the present invention has been made with respect to specific embodiments having features and advantages such as those described, and such specific embodiments may differ from those skilled in the art. It should be noted that the above description should not be construed in a restrictive manner.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a tappet installed in a direct-acting valve device of an internal combustion engine after 2 tons, Fig. 2 is a cross-sectional view of a typical bucket-shaped tappet made of steel according to the prior art, and Fig. 3 is a sectional view of a tappet installed in a direct-acting valve device of an internal combustion engine. 1 and 4 of the preferred embodiment of the hydraulic tappet according to the invention viewed from the planojar side, and 4-4 of FIG.
Fig. 5 is a cross-sectional view of the face member assembly in the tappet shown in Fig. 4;
The figure shows a first modification of the face member shown in FIG. 5, FIG. 7 shows a second modification of the face member shown in FIG. 5, and FIG. 9 is a cross-sectional view showing the relationship between the material of the clearance adjustment body member and the retaining surface in the skirt portion of the face member, and FIG. 9 is a view similar to FIG. 3, showing an embodiment using an alternative tappet. The figure shown in Figure 10 is 10-10 in Figure 9.
11 is a view similar to FIG. 3, showing another alternative embodiment, and FIG. 12 is a sectional view at 12 in FIG.
It is a sectional view at -12. lO: Hydraulic clearance adjustment cup l-(overall) 14
Niji cylinder head 16: Internal combustion engine (whole) 18 Two camshaft 20: Cam rope 22: Cam contact surface (reaction surface) of tappet 24: (Side part connected to engine valve device) 46: Hozoe device (whole) 48: Outer wall Part 50: End wall part 52: Hub part 54: Cam face member (whole) 56: Part interconnected to the outer wall part and the hub part 58: Face part 60 of the face member Varnishing part 62: Through passage 64: Hydraulic clearance adjustment device 68 Nib plunger reaction surface 72: Piston 74: Hollow space in the piston (fluid part) 78: Chesoki ball one-way valve 80: Valve seat 86: Relief portion 88: Bypass passage 90: Fluid passage 96: Plunger Sprinkle 98: Pressure chamber 100: Retainer 132: Discontinuous portion 134: Retaining surface Patent applicant Eaton Corporation Agent
Tadashi Wakabayashi = Go = = ;;・1- Second distribution: Big ≧ Mi, 4-0 Procedural amendment (... January 21, 1985 Commissioner of the Japan Patent Office 1, Indication of the case 1988 Patent application No. 226017
No. 2, @ Akira's name: Hydraulic clearance adjustment tappet 3, Relationship with the person making the amendment Patent applicant: Eaton Corporation 4, Agent address: 1-9-20-5 Akasaka, Minato-ku, Tokyo, Details subject to amendment "Claims" column and [Detailed description of the invention column] 6. Contents of amendment (1) The scope of claims will be amended as shown in the attached sheet. (2) Correct the 10th line of the specification tube 22 chastity 1-I-pore to "Laid-bore". (3) Rockwell 15n on page 26, line 19 of the specification
Correct N to 15N. (4) Correct the 9 rearance adjustment circle on the 19th line of the 32nd page of the specification to the rearance adjustment circle 9. (5) Correct the 9 rearance adjustment circle on the 19th line of the specification tube 39 to the 19th line - Correct the registration mark to 1 inch. Claims 1. A hydraulic clearance adjustment tappet used in a valve device (18, 24) of an internal combustion engine (16), the face member forming a reaction surface (22) that comes into contact with a body device (46) and a cam lobe (20). (54
) and a hydraulic type having a structure operably connected to the body device (46) and forming a reaction surface (68) in contact with a portion (24) connected to the valve device (18, 24) of the internal combustion engine. clearance adjustment means, the reaction surface (68) being operable with respect to the reaction surface (22) of the face member (54), thereby adjusting the clearance of the valve device (1-8, 24). In a hydraulic clearance adjustment tappet for adjusting clearance, the body device (46) is formed of a moldable material having a relatively high coefficient of thermal expansion, such as aluminum or plastic, and the face member (54) is
The body device (46) is connected to the face member (54).
By molding it into a part of the
A hydraulic clearance adjustment tappet characterized by being combined with. 2. The face member (54) has the reaction surface (
22), a generally disc-shaped face portion (
58) and a generally annular skirt portion (60) extending axially from said face portion (58) and connected to said body arrangement (46). Hydraulic clearance adjustment tappet. 3. The body device (46) has a volume density of 2.85 g.
The tappet for hydraulic clearance adjustment according to claim 1, which is made of a material smaller than 1/Cm. 4. The face member (54) is made of steel;
The temperature of the body device (46) is in the range of 20°C to 100°C,
The tappet for hydraulic clearance adjustment according to claim 1, which is made of a material having a coefficient of thermal expansion not substantially smaller than 22XlO-6/unit length/'0. 5. Claim in which the face member (54) adds a limit of a retaining surface (62) which reacts against the material of the body device (46) and prevents relative movement between the adjacent two. A hydraulic clearance adjustment tappet according to item 1. 6. Hydraulic clearance adjustment tappet used in internal combustion engine valve devices (18, 24), which has a coefficient of thermal expansion of 22XIO' in the range of 20°C to 100°C.
-6/unit length/° C. formed of a material having a coefficient of thermal expansion not substantially less than (1) an annular wall (48); (11) within the annular wall (48); an annular hub portion (52) positioned at a distance therefrom; and a portion (56) interconnecting the wall portion (48) and hub portion (52); a face member (20) forming a reaction surface (22) in contact with said body device (46) and coupled to said body device (46) by molding said body device (46) with a portion of said face member (54); 54)
and a valve device (
reaction surface (2) that contacts the part incorporated in (18, 24);
2) is equipped with a hydraulic clearance/asses adjustment means to form the
a hydraulic system characterized in that a reaction surface (22) extends generally parallel to and is movable relative to the reaction surface (22) of the face member (54) for adjusting the clearance of the valve device (46); Tappet for adjusting clearance. 7. The face member (54) is made of steel and consists of an outer wall part (48), a hub part (52) and mutually connecting parts! 7. A hydraulic clearance adjustment tappet according to claim 6, wherein (46) is made essentially of a glass material. 8. The body device (46) has a volume density of 2.85 gr/
The hydraulic clearance adjustment R-t according to claim 6, which is made of a material smaller than cr/L6. 9. The face member (54) includes a generally disc-shaped face portion forming the reaction surface (22), and a generally annular face portion extending axially from the face portion and coupled to the body device (46). A tappet for a hydraulic clearance manufacturing part according to claim 6, characterized in that the skirt part (60) is formed by a skirt part (60). 10. The skirt portion (60) is connected to the annular outer wall portion (
48) The hydraulic clearance adjustment tappet according to claim 9, which extends in the axial direction of the hydraulic clearance adjustment tappet. 11. The tappet for hydraulic clearance training according to claim 9, wherein the skirt portion (60) extends in the axial direction of the hub (52). 12. The hydraulic clearance adjustment tappet according to claim 9, wherein the skirt portion (60) is continuous over substantially the entire circumference. 13. The skirt portion (60) has at least one discontinuous portion (032) on its circumference.
Hydraulic clearance adjustment tappet as described in section. 14. The skirt portion (60) is the same as the 7I? operative to exert a reactionary effect on the material of the eye device (46);
A hydraulic clearance adjustment tappet according to claim 9, which defines a retaining surface to prevent relative movement between the two adjacent ones. 15. The tapos for hydraulic clearance barb according to claim 14, wherein the deep support surface is formed of a through hole (62) extending generally in the radial direction. The hydraulic clearance adjustment tappet according to claim 9, which has an extent substantially the same as the nominal cross-sectional area of the annular outer wall. 17. A hydraulic clearance adjustment tappet (lO) used in a pulp unit (18, 24) of an internal combustion engine, comprising an annular outer wall (48) with a wear-resistant surface on the outer periphery (a)<l) ); (11) an annular hub portion (52) located within and spaced from the outer wall portion (48) and having an inner surface defining a hole; (i+i+ the hub portion (52)); end wall portions each attached to one end in the axial direction and extending in the angular direction of the shaft, and a 6φ web structure extending inward from the outer wall portion (48) and supporting the hub portion (52); Z O"0-10
The reaction surface (46), which is made of a material whose thermal expansion coefficient is not substantially small at 0°C and has a coefficient of thermal expansion of 22 x 10-67 unit length/'O, and (bl) a reaction surface that contacts the cam of the internal combustion engine ( 22), which circumscribes at least a portion of the reaction surface (22) and is positioned to wrap around it radially outwardly of the hole, is molded into the die device (46). has seven rung means extending generally axially and having a reaction surface (
(22) a face member made of a material having a surface hardness of at least 89 Rockwell 15N school; (c) a hydraulic clearance adjustment device movably housed within said hole; The adjusting device has a reaction surface in contact with a portion integral with a portion of the basole 2j device, the reaction surface extending generally parallel to and movable relative to the reaction surface of the face member. The pressure oil chamber (98) and the end wall portion cooperate with a piston (72) and a portion of the hub portion, which together form a first fluid portion (74) of the oil storage chamber. to cause pressurized oil to flow into the oil reservoir (68) forming a second fluid portion (86) of the oil reservoir, thereby changing the position of the reaction surface relative to the reaction surface of the face member. One-way valve (78, 8
0); the hydraulic clearance adjustment device having means (96) for applying a bias in a direction to separate the reaction surface from the reaction of the face member; Hub (5
2) at least one piston master passageway (88) operably communicating between the second oil reservoir portion and the first oil reservoir portion for all positions of the piston and the plunger; has, (at said tapetsu) (10)
from the wear-resistant light surface through the annular outer wall to supply pressurized oil to the one-way valve and passageway (90). said fluid passageway (90) reaching said fluid passageway (90) and a means for holding said clearance adjustment device within said hub (52); 18. A tappet for hydraulic clearance adjustment, characterized in that the structure forming the oil passage has a radius extending between the annular outer wall portion (48) and the hub portion (52). 18. The hydraulic clearance adjustment tappet according to claim 17, comprising a directional web portion. 19. The body device (46) has a volumetric density of 2.85.
The tappet for hydraulic clearance adjustment according to claim 17, which is made of a material smaller than gr/c1rL3. Additionally, the face member (54) is made of steel;
Hydraulic clearance according to claim 17, wherein said body arrangement (46) consisting of an outer wall (48), a hub part (52), an end face part and a web part is made essentially of plastic or aluminum material. Adjustment tappet. 21. A hydraulic clearance adjustment tappet used in a valve device of an internal combustion engine, which is made of a material whose thermal expansion coefficient is not substantially smaller than 22XlO/unit length/°C in the range of 20°C to 100°C. a generally cup-shaped insert member with a reaction surface in contact with the cam lobe (20), into which body material enters and joins said body arrangement 1i (46) with said insert; an insert member having at least one recess; and operably connected to the body device (46);
having a structure forming a reaction surface that contacts a portion connected to a valve device of the internal combustion engine, the reaction surface being movable relative to the reaction surface of the face member in order to adjust the clearance of the valve device; A hydraulic clearance adjustment tappet characterized by having a hydraulic clearance adjustment device.

Claims (1)

[Claims] 1 Hydraulic clearance Thj used in the valve device (18, 24) of the internal combustion engine (1G), which is in contact with the body device (46) and the cam lobe (20) A face member (
54) and a structure forming a reaction surface (68) operably connected to the body device (46) and in contact with the part (24) connected to the valve device (]8, 24.) of the internal combustion engine. In the hydraulic clearance adjustment Yuhata which adjusts the clearance of the reaction valve device (18, 24), the body device (46) is made of a material such as aluminum or plastic. said face member (54) is formed of a moldable material having a relatively high coefficient of thermal expansion, said A hydraulic clearance adjustment Yuha cut characterized by being combined with a body device (46). 2. said face member (54) having a generally disc-shaped face portion (58) forming a reaction surface (22) and extending axially from said face portion (58), said face member (54) 2. A hydraulic slip cover according to claim 1, comprising a generally annular skirt portion (60) connected to a skirt portion (46). 3. The body device (46) has a volume density of 285 g.
1/CnL” The hydraulic clearance adjustment tight according to claim 1, which is made of a material smaller than 1/CnL. 4. The face member (54) is made of steel,
Claim 1, wherein said body device (46) is formed of a material having a coefficient of thermal expansion not substantially less than 22XIO-6/unit length/-C in the range 20''C to 100'C. Hydraulic clearance adjustment tappet according to paragraph 5. The face member (54,) exerts a reaction on the material of the body device (46), causing a relative difference between the two adjacent ones. Hydraulic clearance adjustment kit according to claim 1 which defines the limit of the holding surface (62) that prevents movement. 6. Hydraulic type used in internal combustion engine valve device (] 8, 24) It is suitable for roughness adjustment and has a coefficient of thermal expansion of 22X in the range of 20"C-100"C1.
10/unit length/'C of a material having a coefficient of thermal expansion not substantially less than (i) an annular wall (48
); (II) an annular hub portion (52) located within and spaced apart from said annular wall portion (48); forming a body device (46) consisting of a connecting portion (56) and a reaction surface (22) in contact with the cam lobe (20);
The body device (46) is connected to the face member (54).
) by molding with a part of the body device (46
) is movably incorporated into the face member (54) and the hub portion (52), and the valve device (
reaction surface (2) that contacts the part incorporated in (18, 24);
2), the reaction surface (22) is generally parallel to the reaction surface (22) of the face member (54) in order to adjust the clearance of the valve device (46). Hydraulic clearance adjustment tool featuring scales that extend and move relative to this. 7. The face member (54) is made of steel, and the body device (46) consists of an outer wall part (48), a hub part (52) and an interconnecting part; substantially made of plastic material. A hydraulic clearance adjustment kit according to claim 6. 8. The body device (46) has a volume density of 2.85 gr/
The evening wave soot for hydraulic clearance adjustment according to claim 6, which is formed of a particle smaller than α6. 9. The face member (54) has the reaction surface (
22); and a generally annular skirt portion (60) extending axially from the face portion and joining the body device (46). Hydraulic clearance adjustment gear described in Section 6!・. 10. The tappet for hydraulic clearance adjustment according to claim 9, wherein the skirt portion (60) extends in the axial direction of the annular wall portion (48). 1], the skirt city (60) is Ai + hub (52)
) extends in the axial direction of claim 9.
Terminal for hydraulic clearance adjustment as described in section
. 12. The hydraulic clearance adjustment tappet according to claim 9, wherein the skirt cap (60) is continuous over substantially the entire circumference. 13. Claim 9, wherein the skirt portion (6o) has at least one discontinuous portion o32) on its circumference.
Hydraulic clearance adjustment tab l- as described in Section 1-. J4. The skirt portion (6o) is connected to the body device (
Hydraulic clearance 61.46) defining a retaining surface of the sump which acts to counteract the debris of 61.46) and prevents relative movement between the adjacent two. °Clean evening cover. 15. A hydraulic clearance adjustment device according to claim 14, wherein the retaining surface comprises a generally radially extending through hole (62). 16. The hydraulic clearance adjustment tappet according to claim 9, wherein the face portion (54) has an extent substantially coextensive with the nominal cross-sectional area of the annular outer wall. 17. Soto (]0) for hydraulic clearance adjustment used in the valve device (18, 24) of an internal combustion engine, (a) (1) annular with a wear-resistant surface on the outer periphery; (11) an annular hub portion (52) located within and spaced from the outer wall (48) and having an inner surface defining an aperture; end wall portions extending in a direction perpendicular to 'lQb attached to one end of the hub portion (52) in the axial direction; Equipped with a supporting web structure,] 0'0-1
Thermal expansion coefficient is 22X], O-6/
a body arrangement (46) formed of a material not substantially less than unit length/°C; (1)) a reaction surface (22) in contact with a cam of an internal combustion engine;
and is molded into said body arrangement (46) in a position circumscribing at least a portion of said reaction surface (22) and surrounding said body arrangement (46) radially outwardly of said aperture, generally axially (c) a face member having 7 run means extending in the direction and made of a material having a surface hardness of at least 89 Rockwell 15N scale at the reaction surface (22); (c) a hydraulic clearance adjustment device; The clearance adjustment device is movably housed within the hole, and has a reaction surface that contacts a portion of the nokulp sling that is integral with the part, and the reaction surface is approximately in contact with the reaction surface of the face member. The oil pressure chamber (98) and the end wall jointly form a first fluid portion (74) of the oil storage chamber. a piston (72) and a plunger (68) cooperating with a portion of said hub part to form a second fluid part (86) of said oil reservoir and for allowing pressurized oil to flow into said oil reservoir, thereby a one-way valve (78, 80) for changing the position of the reaction surface of the face member relative to the reaction surface;
the hydraulic clearance adjustment device having means (96) for applying a bias in a direction that separates the reaction surface from the reaction of the face member; and the body device (46). (52
) at least one piston passageway (88) operably communicating between the second oil reservoir portion and the first oil reservoir portion for all positions of the piston and the syringe. and (d) said annular outer wall so as to supply pressure oil to the passage (90) by passing said Yuhatu l-(10) into the internal combustion engine and then sending said one-way valve to the passage (90). the body device (46) configured to supply pressurized oil to the body passageway (90) through which the body passageway (90) reaches the second oil portion from the wear-resistant surface; 18. A hydraulic clearance adjustment device characterized in that it has means (100) for holding the clearance adjustment device within the hub (52). The hydraulic clearance adjustment jet according to claim 17, comprising a radial web section extending between the outer wall section (48) and the hub section (52). 19. The body device (46). However, the volume density is 285g
A hydraulic clearance adjustment tappet according to claim 17, which is made of a material smaller than r/Cm3. 20. The face member (54) is made of steel, and the body armor 5 (46) consisting of the outer wall part (48), the hub part (52), the end face part and the web part is substantially made of plastic or aluminum. A hydraulic clearance adjustment tab L- according to claim 17, which is made of a material. 21. A hydraulic clearance adjustment device used in a valve device of an internal combustion engine, which has a temperature of 20°c-ioooC.
a body arrangement (46) made of a material having a coefficient of thermal expansion not substantially less than 22X10/unit length/'C and a generally cup-shaped insert member with a reaction surface in contact with the cam lobe (20); an insert member having at least one recess into which material of the body enters and is coupled to the body device (46); and an insert member operable to act on the body device (46). are connected,
having a structure forming a reaction surface that contacts a portion connected to a valve device of the internal combustion engine, the reaction surface being movable relative to the reaction surface of the face member in order to adjust the clearance of the valve device; A hydraulic clearance adjustment cover comprising a hydraulic clearance adjustment device.