JPS6210403Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention includes a cam cap that is inserted through a pair of rocker shafts arranged in parallel to which rocker arms of an internal fuel engine are attached, and the rocker arms are connected to an air intake valve and an exhaust valve. This cam cap is for lubricating a valve train, and relates to a cam cap that can easily and inexpensively form an oil flow path between rocker shafts by bridging bolt holes provided on both sides of a rocker arm with an inclined oil communication hole. .

[Background technology]

In order to simultaneously make the oil supplied to one rock shaft flow into the other rock shaft between rock shafts such as overhead cam caps arranged in parallel with each other in the engine, as shown in FIG. A horizontal hole c communicating with the central oil hole b is provided, and the horizontal holes c are connected by an oil connecting hole e formed in the rib d of the cam cap 1a, or as shown in FIG.
An oil communication hole e was provided in the rib d to connect the bolt holes f and f below the rocker shafts a and a. The rocker arm is lubricated by oil passing through a guide hole (not shown) that branches to the oil hole b of the rocker shaft a.

However, the one shown in Figure 6 is a rotsukashaft a.
It is necessary to provide a horizontal hole c, which increases the number of man-hours for machining the part, and it is also necessary to drive a locking shaft a in order to correctly align the horizontal hole c and the oil communication hole e in the longitudinal direction, which increases the time and effort of driving. also increases. Further, in the case shown in FIG. 7, it is necessary to seal the opening of the oil connection hole d using a plug g, which increases the cost of parts and the number of man-hours for installation.

[Purpose of invention]

The present invention aims to provide a lubrication structure for a valve train that can simplify the structure and reduce the cost of the device, as well as solve the above-mentioned problems, based on the fact that the oil connection hole is formed at an angle in the rib. The purpose is

[Disclosure of the invention] Valve train lubrication structure (hereinafter referred to as structure) of the invention
is a pair of rock shafts 9 and 1 with oil holes penetrated through them.
The cylinder head is fixed to the cylinder head 40 using first and second mounting bolts 16 and 17, which are inserted parallel to each other on both sides and pass through the oil holes of the rocker shafts 9 and 10 at right angles, respectively. 40, the first and second mounting bolts 16, 1 are opposed to each other on both sides of the cam cap.
7 is inserted with a gap between the first and second bolt holes 14 and 15, one end of which communicates with the first bolt hole 14 below the rocker shaft 10, and the other end near the inner edge of the rocker shaft 9. The lubricating oil flowing into one bolt hole is connected to the second bolt hole 14 through an inclined oil communication hole 32 which is blocked by the outer edge of the locking shaft 9. It can be allowed to flow through.

〔Example〕

An example of the structure of the present invention is shown below as cam cap 1.
The first to third camshafts support the upper part of the camshaft 2 in order to reduce the number of man-hours for processing and assembly and to form an oil reservoir.
An example in which the bearing parts 3, 4, and 5 are integrally connected and formed will be explained based on the drawings.

In FIGS. 1 to 5, a cam cap 1 has an oil seal attachment hole 6 and a distributor drive gear attachment portion 7 formed at its front end to form the first bearing portion 3. On both sides of the camshaft 3, support pieces 12 and 13 are provided horizontally above the through holes 11 and 11 for fitting the rocker shafts 9 and 10 parallel to the camshaft 2, respectively.
Further, the support pieces 12 and 13 have first and second mounting bolts 1 passing through the centers of the through holes 11 and 11 and through bolt holes 14 and 15 perpendicular to the through holes 11 and 11, respectively.
6 and 17 are opposed on both sides of the cam cap 1.
Further, behind the first bearing portion 3, similar support pieces 21 to 26 are spaced apart from each other with the vertical ribs 20 in between, and are equally spaced and form an opening 31 for mounting the rocker arm 30 between the vertical ribs 20. At the same time, the second bearing part 4 is also connected to the rearmost pillar pieces 25, 2 by the support pieces 21, 22 adjacent to the first bearing part 3.
A third shaft piece portion 5 is formed between the two portions 6, respectively. An oil communication hole 32 is bored in the horizontal rib 19 between the strut pieces 12 and 13 of the first bearing part 3. The oil communication hole 3
2 has one end connected to the cam cap 1 as shown in Fig. 4.
The lower end and the through hole 11 communicate with the second bolt hole 15 approximately in the center, and the other end communicates with the first bolt hole 14.
A hole is opened at an angle from the side surface of one support piece 12 so that the axis passes slightly above the intersection point k between the support piece 12 and the through hole 11. The rock shafts 9 and 10 are provided with an oil hole 34 in the center, and each support piece 12 and 1
3, 21 to 26 each bolt hole 14, 1
At positions 5 and 33, vertical holes 35 are provided which penetrate orthogonally to the oil holes 34, and therefore, as shown in FIG. 35 and into each bolt hole 14, 15, 33, respectively.
17, the other end of the oil connecting hole 32 in the first bearing part 3 passes through the vicinity of the inner lower edge x of the locking shaft 9 and communicates with the first bolt hole 14, and the outer open end 36 of the oil connecting hole 32 passes through the vicinity of the inner lower edge x of the locking shaft 9 and communicates with the first bolt hole 14. 9, and the first and second bolt holes 14, 15 are bridged by the oil connection hole 32. Note that the cylinder head 40 to which the cam cap 1 is attached has its first bearing portion 3.
An oil hole 4 from which lubricating oil is discharged by an oil pump (not shown) is provided on the journal surface 41 of the lower bearing portion below.
2 is formed, and an oil groove 43 extending through the journal surface 41, the lower surface of the cam cap 1, and around the thread 18 of the mounting bolt 15 is connected to the oil hole 42.

Thus, the cam cap 1 is placed on the cylinder head 40, the cam shaft 2 is supported from above, and the through hole 1 is
The first and second mounting bolts 16 and 17 pass through the vertical holes 35 of the rocker shafts 9 and 10, which are tightly fitted into the shafts 9 and 10.
Fix it using. At this time, the upper ends of the first and second bolt holes 14 and 15 are sealed using seal washers interposed on the first and second mounting bolts 16 and 17, respectively. Therefore, the lubricating oil pumped through the oil groove 43 rises through the gap between the second bolt hole 15 and the second mounting bolt 17 and enters the vertical hole 3.
5 and flows into the oil hole 34 of one rock shaft 10, and at the same time flows through the oil connection hole 32, rising while filling the other gap from below, and flowing into the oil hole 34 of the rock shaft 9. The camshaft 2 can be lubricated in the second and third bearing parts 4 and 5 by the lubricating oil passing through the oil holes 34 in the shaft shafts 9 and 10, and the camshaft 2 can be pivotally mounted on the horizontal hole (not shown). It is possible to lubricate the rock shaft 30 that is used.

[Effect of idea]

As mentioned above, the structure of the present invention has one end communicating with one bolt hole of the mounting bolts placed opposite to each other on both sides of the cam cap at the bottom of the rocker shaft, and the other end communicating with the bolt hole of the mounting bolt placed on both sides of the cam cap, and the other end passing near the inner outer edge of the rocker shaft. By providing an inclined oil communication hole that communicates with the hole, the lubricating oil that flows into one bolt hole can flow into the other bolt hole, and unlike conventional devices, there is no side hole in the shaft for connecting with the oil communication hole. There is no need to provide one, and the processing becomes easy.Furthermore, since the oil communication hole is blocked by the outer edge of the rock shaft, there is no need to seal the opening of the oil communication hole with a plug, thus reducing parts costs. In addition, the work for aligning the rocker shaft with the horizontal hole can be eliminated. By simplifying the lubrication structure of the valve train in this way, the cost of the device can be reduced and productivity can be improved. In the cam cap of the present invention, the pipe member communicating with the oil pump may be directly connected to the oil hole 34, or a groove (not shown) may be provided vertically in the bolt hole to smooth the oil flow path. You can also do that.

[Brief explanation of the drawing]

Figure 1 is a front view showing the cam cap of the present invention;
Fig. 2 is a plan view thereof, Fig. 3 is a vertical sectional view showing its assembly, Fig. 4 is a sectional view taken along the line A-A, Fig. 5 is a sectional view taken along the line A-A showing the assembled state, and Fig. 6 is a sectional view taken along the line A-A. 7 are cross-sectional views showing conventional devices. 1...Cam cap, 2...Cam shaft, 9,10
...Lotsukashaft, 14...First bolt hole,
15...Second bolt hole, 16...First mounting bolt, 17...Second mounting bolt, 32...Oil communication hole, 40...Cylinder head, x...Inner lower edge, y... ...outer edge.

Claims (1)

[Scope of utility model registration request] A pair of rocker shafts having oil holes penetrated through them are inserted in parallel on both sides, and are fixed to the cylinder head using first and second mounting bolts that pass through the oil holes of the rocker shafts at right angles, respectively. The cam cap is provided with a cam cap that holds the camshaft between the cam cap and the cylinder head, and the first and second bolt holes, which are opposed to each other on both sides of the cam cap, are inserted with a gap between the first and second bolt holes. , by means of an inclined oil communication hole, one end of which communicates below the first bolt hole, the other end of which passes near the inner lower edge of the locking shaft and communicates with the second bolt hole, and is blocked by the outer edge of the locking shaft. A lubrication structure for a valve train that is characterized by being connected.