JPH0247562B2 - 4SAIKURUENJINNOBARUBUSUPURINGUSHIITO - Google Patents

Abstract

PURPOSE:To easily assemble a valve spring seat, by providing holes in a pitch corresponding to the pitch of a valve guide in a sheet of plate and forming a plurality of the valve spring seats by the single sheet of plate. CONSTITUTION:A sheet of plate 250, providing holes 252 in a pitch corresponding to the pitch of a valve guide provided in a cylinder head, is arranged between a valve seat and a valve spring in a cylinder head. In this way, a valve spring seat, in which a single sheet of the plate 250 serves as the plural spring seats, is easily assembled while prevented from wearing by preventing the seat from simultaneously turning together with the spring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a valve spring seat installed in a cylinder head of a four-stroke engine.

[Prior art]

Conventionally, in a four-stroke engine, a substantially disk-shaped valve spring seat having one hole into which a valve guide is inserted is individually attached to each valve seat formed in a cylinder head. That is, if a plurality of valve seats supporting the valve guide are formed, a corresponding number of valve spring seats are required.

As described above, according to the conventional valve spring seat, a valve spring seat must be individually attached to each valve seat, making the assembly work of the cylinder head extremely complicated.

Furthermore, according to conventional valve spring seats, when the engine is started, the spring seat gets twisted together with the valve spring due to factors such as repeated loads from the valve spring.
This had the disadvantage that the valve seat and spring seat wore out.

Furthermore, in the past, so-called oil-cooled engines were considered in which lubricating oil was supplied into a recess formed in the cylinder head located above the combustion chamber, and the cylinder head was cooled by the supplied lubricating oil. However, in the case of such oil-cooled engines, if the lubricating oil supplied to the recess overflows and adheres to the valves and valve springs, mechanical loss occurs, reducing the output of the oil-cooled engine. There are drawbacks to this.

[Purpose of the invention]

In view of the above-mentioned circumstances, this invention has been developed to simplify the assembly work of the cylinder head, prevent slippage, and further reduce the mechanical loss of an oil-cooled engine as much as possible. The purpose is to provide valve spring seats for engines.

[Structure of the invention]

In order to achieve the above-mentioned object, this invention:
Lubricating oil is supplied into a recess formed in the cylinder head located above the combustion chamber, and the cylinder head is cooled by the supplied lubricating oil.
In a valve spring seat in a cycle engine, the valve spring seat is formed by a plate having a plurality of holes with pitches corresponding to the pitches of a valve guide disposed in the cylinder head, and the plate is attached to the cylinder head. The valve is disposed between the formed valve seat and the valve spring and protrudes toward the center of the cylinder head beyond the valve seat so that one end faces the upper surface of the recess. The lubricating oil is prevented from adhering to the valves and valve springs as much as possible.

〔Example〕

Hereinafter, one embodiment of a valve spring seat according to the present invention will be described in detail.

Figures 4 and 5 show a cylinder head 10 to which the valve spring seat of the present invention is installed, and is particularly suitable for parallel 4-cylinder, 4-valve DOHC (double overhead camshaft) engines mounted on motorcycles. This shows the cylinder head.

As shown in FIG. 4, on the exhaust port side (arrow A) and inlet port side (arrow B) of this cylinder head 10, there are bearings of a camshaft (not shown) that drive rocker arms on the exhaust side and inlet side, respectively. Sections 12 and 14 are formed. Further, at the lower part of each of the bearings 12 and 14, there is formed a bearing of a rocker shaft (not shown) that supports each rocker arm on the exhaust side and inlet side, respectively.

On the other hand, on the peripheral surfaces of the bearings 12 and 14, lubricating oil is fed under pressure through an oil gear rally (not shown) formed in the cylinder head 10.
6 are formed respectively.

Further, in the center of the surface of the cylinder head 10 shown in FIG. 4, a recess 20,
22, 24, 26, 28, and 30 are formed, respectively. These recesses 20, 22, 24, 26,
28, 30 are combustion chambers 32, 34, 3 shown in FIG.
6, 38, and as shown in FIG. 6, which is a partially cutaway front view of the cylinder head 10, each combustion chamber 32, 34,
36, 38 (however, the cylindrical spark plug mounting boss 40, 42, 44 formed above the center of each combustion chamber 32, 34, 36, 38)
46). Therefore, each peripheral wall portion 2 of each of the above-mentioned recesses 20, ..., 30
0a, 22a, 24a, 26a, 28a, 30a
are adjacent to the circumferential surfaces of the valve seat 50 that supports the exhaust valve and the valve seat 52 that supports the inlet valve as shown in FIG. It is adjacent to the periphery of the plug seat 54 formed every 38 times. Each recess 20, 2 formed in this way
When lubricating oil is supplied into the recesses 20, 24, 26, 28, 30 from the oil supply passages described later, this oil flows into each recess 20, 22, 24, 26, 2.
8, 30, this accumulated oil generates oil around each combustion chamber 32, 34, 36, 38 (Fig. 5) and around the valve seats 50, 52 and plug seat 54. Heat is drawn out and the main part of the cylinder head 10 is cooled. On the other hand, as shown in FIG.
Each peripheral wall portion 2 of 0, 22, 24, 26, 28, 30
0a, 22a, 24a, 26a, 28a, 30a
There are discharge holes 60, 62, 64, which temporarily store the oil supplied in this recess and then discharge it sequentially.
66, 68, 70, 72, 74 are formed, among which are discharge holes of recesses 20, 24, 26, 30 formed at positions facing both left and right ends of the cylinder head 10 with a cam chain chamber 90 interposed therebetween. 6
0, 66, 68, 74 are discharge passages 80, 82, 8
4 and 86, the stud bolt insertion hole 9
It communicates with 0, 92, 94, and 96. Therefore, the oil supplied to the recesses 20, 24, 26, 30 passes through the discharge holes 60, 66, 68, 74 and the discharge passages 80, 82, 84, 86 to the stud bolt insertion holes 90, 92, . 94, 96, and the insertion holes 90, 92, 94, 96
is returned to the engine's oil pan via the
On the other hand, the discharge holes 62, 64 of the recesses 22, 28,
70, 72 are discharge passages 100, 102, 10
4 and 106, the main exhaust passages 110 and 112 formed on the exhaust port side are communicated with each other. As shown in FIG. 6, the main exhaust passages 110 and 112 are formed on the surface of the cylinder head 10 between the respective exhaust ports. Also,
The discharge passages 100, 102, 104, 106 are formed adjacent to the wall surface of the exhaust port formed in the cylinder head 10, so that the oil supplied to the recesses 22, 28 flows through the discharge passages 100, 102. , 104, 106 into the main exhaust passages 110, 112, the heat generated in the exhaust port is sucked and the exhaust port is cooled at the same time.

Note that the main discharge passages 110 and 112 include discharge passages 100 and 10 that communicate with the recesses 22 and 28.
In addition to holes 120, 122, 124, 1 in the cylinder head 10 above the exhaust port, as shown in FIGS.
Each discharge passage 13 with 26, 128, 130
2, 134, 136, 138, 140, 142 are in communication with each other, so that the oil flowing above the exhaust port of the cylinder head 10 is transferred to each of the discharge passages 132, 134, 136, 138, 140.
It is discharged into the main discharge passages 110 and 112 through the main discharge passages 110 and 112. In addition, in FIG. 4, the symbols 150, 152, 1
54, 156, 158, 160, 162, 164
Reference numerals 170, 172, 174, and 176 indicate flanges formed on the upper portions of the ignition plug mounting bosses 40, 42, 44, and 46, respectively. The flange portions 170, 172, 174, 176 are filled with oil, respectively.
Holes 180, which are part of oil supply passages to be described later, are formed to supply oil into the interiors of the cylinders 6, 28, and 30, respectively. Also, in FIG.
4,196 are exhausts 50, 52, respectively.
This hole 19 is a hole formed below 54 and 56.
0, 192, 194, and 196 communicate with the interiors of spark plug mounting bosses 40, 42, 44, and 46 shown in FIG. In addition, in FIG. 6 and FIG.
0 represents each of the recesses 20, 22, 24, 2, respectively.
The boss portions 210, 212, 214, 216, 218,
220 has female screw portions 210a and 212, respectively.
a, 214a, 216a, 218a, 220a
(Fig. 4) is formed. This female screw part 21
0a, 212a, 214a, 216a, 218
a, 220a is a female screw portion for mounting a plate-shaped lid 230 shown in the enlarged plan view of FIG. Recesses 20, 22, 24, and recess 26, which are symmetrically formed with
28 and 30 respectively independently. Note that this lid body 230 is formed to have a U-shaped cross section to increase its mechanical strength. Further, this lid body 230 is formed with a hole 232 for fitting a mounting bolt and a hole 234 for fitting a pipe forming an oil supply passage described later. Therefore, when this lid body 230 is installed inside the cylinder head 10 shown in FIG.
As shown in the enlarged plan view of the main parts in the figure, each recess 20, 22, 24, 26, 28,
30 will be blocked. In this way, when the concave portion for storing oil is covered with the lid 230, the stored oil is transferred to the concave portions 20, 22, 24, 26, 2.
This prevents the particles from flying out and scattering from the particles 8 and 30 into the cylinder head 10. In addition, the reference numeral 240 in FIG. 8 is a mounting bolt for the lid body 230. On the other hand, in the above-mentioned cylinder head 10, a plate-shaped valve seat 250 according to the present invention is used, as shown in the enlarged plan view of FIG. 1 and FIG. 2, which is a side view thereof. This valve seat 250 has a hole 252 into which a valve guide is inserted.
A plurality of holes are formed with pitches corresponding to the pitches of the valve guide, and the cross section thereof is formed into an L-shape to increase mechanical strength. FIG. 3 is a plan view showing the state in which the valve seat 250 is installed in the cylinder head 10. As is clear from the figure, one end of the shape of the valve seat 250 is located at the recesses 20, 22, 24, 26, 28, 3
The valve seat 50 is placed so as to protrude toward the center of the cylinder head from the valve seat 50 so as to face the top surface of the valve seat 50. Therefore, according to the valve seat 50 described above, the recesses 20, 22, 24, 26, 28,
The valve seat 25 is arranged so that the oil overflowing from inside the valve seat 30 protrudes toward the center of the cylinder head.
One end of the L-shape of the 0 prevents its progress and prevents it from adhering to the valve or valve spring as much as possible. In addition, in Figure 3, Figures 4 and 8
The same parts as in the figure are indicated by the same reference numerals. Note that this valve seat 250 is fixed to the valve seat by a valve spring (not shown).

Next, the oil supply passages for supplying oil into the recesses 20, 22, 24, 26, 28, and 30 formed in the cylinder head 10 will be described in detail.

9 and 10 are a top view and a bottom view, respectively, of a cylinder head cover 260 that covers the cylinder head 10 shown in FIG. 4.

This cylinder head cover 260 is formed to cover the entire surface of the cylinder head 10 shown in FIG. 4, and has a hole 262 for taking out blow-by gas in the center thereof. Further, insertion holes 270, 272, 274, and 276 for inserting a spark plug and a tool for attaching and removing the spark plug are formed in the longitudinal direction of the center thereof. Note that each insertion hole 270, 27
2, 274, 276 have guide grooves 270a, 272a, 27 for the ignition plug and a tool for attaching and removing the ignition plug.
4a and 276a are formed, respectively. On the other hand, as shown in FIG. 10, on the bottom surface of the head cover 260, oil is supplied under pressure from an oil supply device (not shown) to each cylinder head cover 260.
an oil supply passage 280 that guides to the central part of 60;
282 is formed. This oil supply passage 2
80, 282 have one end communicating with the supply hole 290, 292 formed in the cylinder head cover 260 on the inlet port side, and the other end thereof branches into an insertion hole 270, for installing a spark plug. 2
Flange portion 2 formed at 72, 274, 276
70b, 272b, 274b, and 276b. These flange parts 270b, 272b, 2
74b and 276b are equipped with cylinder head cover 2.
Insertion holes 310, 312, 3 for bolts (described later) for fixing the cylinder head 60 to the cylinder head 10 (Fig. 4)
14,316,318,320,322,324
are formed respectively, and the other ends of the branched oil supply passages 280, 282 are inserted into these insertion holes 310, 312, 314, 316, 318, 32.
It is connected to 0,322,324. Therefore, as shown by the arrows, the oil supplied from the supply holes 290, 292 passes through the oil supply passages 280, 282 to the insertion holes 310, 312, 3, respectively.
14,316,318,320,322,324
You will be guided to. In addition, these insertion holes 310, 312, 316, 318, 320, 32
2,324 is the mounting boss 40,4 shown in FIG.
2, 44, 46 flange portions 170, 172,
They are formed at positions corresponding to holes 180 formed in holes 174 and 176, respectively. In addition, the reference numeral 330 in FIGS. 9 and 10 indicates the cylinder head cover 260, respectively, and the cylinder head 10 (FIG. 4).
This is the insertion hole for the fixing bolt that is fixed to the on the other hand,
The insertion hole 31 of the cylinder head cover 260
0,312,314,316,318,320,
The oil guided to the cylinder heads 322 and 324 is transferred to the cylinder head as shown in FIG. The oil passage 342 formed in the tightening bolt 340 and the flange portions 170, 172,
Each recess 20, 22, 24, 26, 28,
Supplied within 30 minutes. Note that in the cylinder head 10 shown in FIG.
The oil supplied to each hole 180 of holes 2, 174, and 176 is passed through a pipe 344 to the recesses 20, 22,
I tried to lead it to within 24, 26, 28, 30, but
Of course, without using the pipe 344, each flange portion 170, 172, 174, 176 is connected to each recess 2.
0, 22, 24, 26, 28, and 30, and an oil passage may be formed inside the flange portion. Note that the tightening bolt 340 shown in FIGS. 11 and 12 has an oil passage 342 formed in a T-shape inside thereof, as shown in the enlarged partial cross-sectional perspective view of the tightening bolt 340 shown in FIG. The oil that enters from the circumferential surface 340a of this bolt 340 flows as shown by the arrow.
It is guided to the lower end of the bolt 340. In addition, the first
In Figures 1 and 12, Figures 4, 6, and 8
The same parts as in FIG. 3, FIG. 3, and FIG. 10 are designated by the same reference numerals. On the other hand, each recess 20 of the cylinder head 10,
As described above, the oil supplied into the recesses 20, 22, 2
4, 26, 28, 30 peripheral wall portions 20a, 22
Discharge holes 60, 62, 64, 66, 68, 70 formed in a, 24a, 26a, 28a, 30a,
72, 74 (Fig. 4), the oil is discharged into the stud bolt insertion holes 90, 92, 94, 96 or the main exhaust passages 110, 112, and is further discharged into the engine oil pan through an oil return passage (not shown). will be returned within.

Incidentally, engines mounted on motorcycles are usually mounted tilted forward in the direction of travel in order to reduce the height of the vehicle body as much as possible.
is slanted so that the exhaust port side is lower,
For this reason, the oil discharged into the cylinder head after lubricating other sliding parts such as the camshaft also flows through the discharge holes 120, 122, 124 shown in FIG. 4, similar to the oil temporarily stored in the recess. ,12
6, 128, 130 side, and is discharged into the main discharge passages 110, 122 through the discharge holes.

In addition, in the above embodiment, as shown in FIG.
00 are finished in a flat shape along the surface of the combustion chamber, and each recess 20,
By increasing the contact surface between the oil temporarily stored in 22, 24, 26, 28, and 30 and the bottom surface 400,
In order to enhance the cooling effect of the oil, the bottom surface 400 may be finished in an uneven shape, as shown in the enlarged cross-sectional view of the main part in FIG. 14, in which the same parts as in FIG. As shown in FIG. 15, which is a plan view of the main part in FIG. will be smoothly guided to the discharge hole.

〔Effect of the invention〕

As described above, in this invention, a plurality of holes are formed in one plate into which the valve guide is inserted,
Since this is used as a valve spring seat and placed between the valve seat and the valve spring, one plate serves as many valve spring seats, making the assembly work of the cylinder head extremely simple.

In addition, since one plate fits into multiple valve guides at the same time, it does not move independently, which prevents the valve spring seat from twisting around and improves the durability of the valve seat and spring seat. be able to.

Furthermore, in the valve spring seat of this invention, the valve spring seat is arranged so as to protrude toward the center side of the cylinder head from the valve seat so that the top surface of the recess where cooling lubricating oil is temporarily stored is located inside the recess. To prevent lubricating oil overflowing from adhering to the valves and valve springs as much as possible, thereby reducing mechanical loss of the oil-cooled engine as much as possible and improving the output of the oil-cooled engine. I can do it.

[Brief explanation of the drawing]

1 and 2 are an enlarged top view and a side view of a valve spring seat according to the present invention, FIG. 3 is an enlarged view of main parts of a cylinder head equipped with a valve spring seat of the present invention, and FIGS. 4 and 2 are 5 is a top view and a bottom view of a cylinder head using the valve spring seat of the present invention, FIG. 6 is a partially cutaway front view of FIG. 4, and FIG.
The figure is an enlarged plan view of the lid body, Figure 8 is an enlarged top view of the main parts of the cylinder head with the lid attached, Figures 9 and 10 are top views and bottom views of the cylinder head cover, and Figure 11 is a top view of the cylinder head cover. Fig. 12 is a sectional view of the cylinder head with the cylinder head cover attached, Fig. 12 is a DD sectional view of Fig. 11, Fig. 13 is an enlarged partial cross-sectional perspective view of the cylinder head tightening bolt, and Fig. 14 is a cross-sectional view of the other recessed parts. FIG. 15 is a sectional view of a main part of a cylinder head showing an embodiment, and FIG. 15 is a top view of the main part of FIG. 14. 10... Cylinder head, 50, 52... Valve seat, 250... Valve spring seat, 25
2...hole.

Claims (1)

[Scope of Claims] 1. A valve spring for a four-stroke engine, which supplies lubricating oil into a recess formed in a cylinder head located above a combustion chamber, and cools the cylinder head with the supplied lubricating oil. In the seat, the valve spring seat is formed by a plate having a plurality of holes with pitches corresponding to the pitches of the valve guide disposed in the cylinder head, and the plate is connected to the valve seat formed in the cylinder head. and the valve spring, and is arranged so as to protrude further toward the center of the cylinder head than the valve seat so that one end faces the upper surface of the recess.
Cycle engine valve spring seat.