JPH0814247B2 - Engine lubricator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine lubrication device in which an auxiliary machine such as a distributor driven by a camshaft on a cylinder head is arranged coaxially with the camshaft.

(Prior Art) Conventionally, as a lubricating device of this type, for example, there has been one as shown in FIG.

Explaining this, the cam shaft 52 is supported by the cam bearing portion 51a formed on the upper surface of the cylinder head 50,
Distributor 60 driven by camshaft 52
In an engine in which the cylinder head 50 is fitted and attached to one end of the cylinder head 50, the cam shaft 52 and the drive shaft of the distributor 60 are provided between the cam bearing portion 51a and the distributor 60.
A storage chamber 54 is formed to store the shaft coupling 53 for coupling with the shaft 60a, and the lubricating oil leaking from the cam bearing portion 51a is stored in the storage chamber 54 to lubricate the shaft coupling 53. It is not necessary to form a supply passage in the cylinder head 50 for supplying lubricating oil to 53.

Further, an oil guide groove communicating with an oil return hole having one end opened to the storage chamber 54 and the other end opened to the cylinder head 50 is formed so as to be inclined upward, and lubricating oil is required in the storage chamber 54. It is designed to be returned to the oil pan without accumulating.

(Problems to be Solved by the Invention) However, in such a lubricating device, since the thrust flange 52a is formed between the bearing portion 51a and the storage chamber 54, the thrust flange 52a is formed in the bearing portion. Prevents lubricating oil from flowing into the storage chamber 54 from the 51a, and the flange 52a
However, there is a problem that the lubricating oil does not easily collect in the storage chamber 54 after flowing out to the cam chamber 55.

Further, when this engine is mounted on an automobile, when the vehicle leans during turning, etc., the lubricating oil stored in the storage chamber 54 flows out through the oil guide groove.
There was a concern that the storage chamber 54 would be depleted of lubricating oil, resulting in poor lubrication.

The present invention aims to solve these conventional problems.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, an auxiliary machine is arranged coaxially with a camshaft on a cylinder head, and the auxiliary machine is connected to the auxiliary machine via a shaft coupling. In an engine that transmits a rotational force, a cam bracket that bears the cam shaft is provided with a cover portion that covers an upper portion of the shaft coupling, and a recess is formed on an upper surface of the cover portion to collect oil scattered in the cam chamber. A guide groove is formed on the inner peripheral surface of the portion above the shaft coupling in the circumferential direction to form an oil supply hole that opens to the recess and the guide groove, and a strip-shaped oil draining part located on both sides of the oil supply hole in the guide groove. Was formed in the axial direction.

(Operation) Based on the above configuration, while oil splashes that have splashed during valve train movement fall into the recess formed on the cam bracket, the oil that has just adhered to the cam cover flows down, and the engine speed is constantly maintained. It is possible to supply the appropriate amount of oil to the shaft coupling through the oil supply hole, prevent the oil film from depleting at the joint of the shaft coupling, and generate tapping noise, etc. it can.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 attached.

The cylinder head 1 is provided with one cam shaft 2, and the cam shaft 2 transmits rotational force from a crank shaft via a chain or the like (not shown) to open and close an intake / exhaust valve via a rocker arm or the like. A distributor 3 is rotatably driven through a shaft coupling 10 as an auxiliary machine that is fitted and mounted coaxially with the camshaft 2 at the rear portion of the cylinder head 1.

The shaft joint 10 includes a pair of recesses 11 formed at the rear end of the camshaft 2 with the center of rotation interposed therebetween, and a drive shaft 12 of the distributor 3 arranged coaxially with the camshaft 2.
It is composed of a pair of projections 13 that engage with a recess 11 formed at the tip of the.

A semi-circular bearing portion 4 is integrally formed on the upper surface of the cylinder head 1 so as to sandwich each cylinder, and bears the camshaft 2.

On the upper surface of the cylinder head 1, there is integrally formed a semi-arcuate lower bracket portion 5 into which the housing 14 of the distributor 3 is fitted behind the rearmost bearing portion 4, while the rearmost bearing portion 4 and A cam bracket 6 is attached across the lower bracket portion 5.

The cam bracket 6 is fitted with a semi-arcuate bearing cap portion 15 that bears the cam shaft 2 continuously with the bearing portion 4 of the cylinder head 1, and a housing 14 of the distributor 3 protruding rearward from the bearing cap portion 15. The semi-circular upper bracket 16 and the bearing cap 15
And a semi-cylindrical cover part (20) that connects the upper bracket part (16) and covers the shaft joint (10) above.

Boss portions 17 are integrally formed on both ends of the bearing cap portion 15 of the cam bracket 6, and two bolts 18 that pass through the boss portions 17 are screwed into the screw holes 19 of the cylinder head 1, respectively. Boss portions 21 are formed at both ends of the upper bracket portion 16 of the cam bracket 6, and two bolts 22 which pass through the boss portions 21 are respectively screwed into the screw holes 23 of the cylinder head 1 and four bolts 18 are provided. The cam bracket 6 is fastened to the cylinder head 1 by 22, 22.

Inside the lower bracket portion 5 of the cylinder head 1 and the upper bracket portion 16 of the cam bracket 6, an annular seal 24 is interposed between the lower bracket portion 5 of the cylinder head 1 and the housing 14 of the distributor 3 to ensure oil tightness.

A cam cover 7 is provided above the cylinder head 1, and a cam chamber 30 is defined between the cam cover 7 and the cam cover 7.
A seal 25 is provided at a joint portion of the cam cover 7 with the cylinder head 1 and the cam bracket 6 so as to be oil-tight.

An oil supply hole 8 is formed in the cover portion 20 of the cam bracket 6, and the oil supply hole 8 is located immediately above the shaft coupling 10 and opens.

A guide groove 26 for opening the oil supply hole 8 is formed inside the cover portion 20 of the cam bracket 6. The guide groove 26 is located in the outer peripheral direction of the shaft coupling 10 and is formed in a semi-arc shape.
In the middle of the process, two oil cutting parts 27 project in a strip shape so as to sandwich the opening of the oil supply hole 8.

Guide ribs 28 that linearly connect the left and right boss portions 17 to each other are formed on the outer upper surface of the cam bracket 6, and left and right guide ribs 29 are formed so as to surround the oil supply hole 8 from the left and right boss portions 17, respectively. , 29 form a recessed portion 9, and the recessed portion 9 collects the oil splashes in the cam chamber 30 and guides them to the oil supply hole 8.

The left and right guide ribs 29 project from the left and right boss portions 17 toward the cam cover 7 in a taper shape, and the respective tip portions of the left and right guide ribs 29 and the opening edge portions of the oil supply holes 8 are substantially aligned with the edge portion of the seal 25 that seals the cam cover 7 with oil. Arranged to do so.

The cam cover 7 is formed with a rear wall portion 33 that inclines above the concave portion 9 of the cam bracket 6 at a predetermined angle, and a rib 35 that protrudes downward from the ceiling wall portion 34 of the cam cover 7 is provided.
Is formed at a predetermined distance from the front.

A shaft hole 31 is formed in the camshaft 2, and a through hole 32 that opens from the shaft hole 31 to the bearing portions 4 and 15 is formed. Pressurized oil discharged from an oil pump is introduced into the shaft hole 31 via a supply passage (not shown) formed in the cylinder head 1. A plug 39 is press-fitted into one end of the shaft hole 31 to ensure oil tightness.

Two oil removing holes 36 are formed behind the bearing portion 4 of the cylinder head 1, and each oil removing hole 36 is formed in the cylinder head 1.
The upper oil is made to flow down to an oil pan through a cylinder block (not shown).

 Next, the operation will be described.

During operation of the engine, the rotation of the camshaft 2 causes the shaft 12 of the distributor 3 to rotate via the shaft coupling 10, and the distributor 3 ignites the high voltage generated in the coil as the shaft 12 rotates to the ignition plug of each cylinder. Distribute power according to the order.

The oil stored in the oil pan is sucked up by an oil pump, lubricates each bearing portion 4 from the shaft hole 31 of the camshaft 2 through the through hole 21, and also passes through the supply passage (not shown) to the bearing portion of the rocker shaft. Etc. Lubricate other valve mechanism.

In this way, the oil that lubricates the camshaft 2 and the rocker shaft is scattered in four directions inside the rocker chamber 30 as the camshaft 2 and the rocker shaft rotate at high speed, and a part of this oil splash is shown in FIG. As shown by the arrow, the water drops into the recess 9 formed on the cam bracket 6 and is collected in the oil supply hole 8, and a part of the oil adheres to the cam cover 7 to form a wall flow and is formed on the cam bracket 6. It is guided to the oil supply hole 8 via the recess 9.

The oil collected by the recess 9 passes through the oil supply hole 8 and is guided to the guide groove 26 side formed on the inner periphery of the cover 20.
In this case, since the mist-like scattered oil gathers in the concave portion 9, the flow rate is not so large, and therefore the oil having passed through the oil supply hole 8 tends to form a wall flow along the guide groove 26. However, since this flow is dammed by the oil draining portions 27 formed in strips on both sides of the oil supply hole 8,
It surely drops onto the shaft coupling 10 from the lower edge of the oil draining portion 27. Further, a part of the dropped oil is scattered in the outer peripheral direction by the shaft joint 10 rotating at a high speed, but a part of this oil is collected again by the guide groove 26 and dripped from the oil draining section 27 to the shaft joint 10. It will be. In this way, the oil captured on the upper surface of the cam bracket 6 or the cover portion 20 is surely supplied to the shaft coupling 10, whereby the concave portion 11 of the cam shaft 2 and the distributor drive shaft.
An oil film layer is secured at the joint between the protrusions 12 and the protrusions 13 to prevent tapping noise and the like.

The oil that has lubricated the shaft coupling 10 falls on the cylinder head 1 and is returned to the oil pan through the oil return hole 36.

Since the concave portion 9 formed on the cam bracket 6 is arranged adjacent to the cam portion 38 of the cam shaft 2 through the guide rib 28, the oil splashes scattered from the cam portion 38 and the rocker arm can be effectively collected. To be

The tips of the left and right guide ribs 29 are joined to the seal 25 of the cam cover 7 so as to sandwich the opening of the oil supply hole 8 and the recess 9 is connected to the lower end of the cam cover 7.
The oil flowing down along with is effectively guided to the oil supply hole 8 through the recess 9.

Further, since the rear wall portion 33 of the cam cover 7 is located above the concave portion 9, the oil dropped from the rear wall portion 33 is dropped into the concave portion 9 and is effectively collected.

The oil scattered from the camshaft 2 and the like increases with the engine speed, and the amount of oil collected by the reaction unit 9 increases according to the engine speed, and a sufficient amount of oil passes through the oil supply hole 8 throughout the entire operating range. Guided by the joint 10, the amount of oil according to the engine speed can always be supplied to the shaft joint 10 through the oil supply hole 8, and the oil film is exhausted at the joint of the shaft joint 10 and a tapping sound is generated. Therefore, the distributor 3 can be driven smoothly.

Further, in the cam bracket 6, the bearing cap portion 15 and the upper bracket portion 16 are integrally formed via the cylindrical cover portion 20, so that the support rigidity of the distributor 3 is enhanced and the cam bracket 6 is scattered from the shaft coupling 10. The oil splashes are captured in the guide groove 26 formed inside the cover portion 20 and a part of the oil splashes is again fed from the oil draining portion 27 to the shaft coupling 10.
Some of them are quickly flown down to the cylinder head 1 along the guide grooves 26.

The present invention is applied not only to the distributor but also to a crank angle sensor or the like for detecting the rotation angle of the crankshaft, as an accessory driven by a camshaft via a shaft coupling.

(Effects of the Invention) As described above, according to the present invention, in a lubricating device for an engine that transmits a rotational force from a camshaft to an auxiliary machine such as a distributor via a shaft coupling, the cam bracket bearing the camshaft is provided with A cover portion is formed to cover the upper side of the shaft joint, a recess is formed on the upper surface of the cover portion to collect the oil scattered in the cam chamber, and a guide groove is formed in the circumferential direction above the shaft joint on the inner peripheral surface of the cover portion. Since the oil supply hole that opens to the recess and the guide groove is formed, and the belt-shaped oil draining parts located on both sides of the oil supply hole are formed in the guide groove in the axial direction, the shaft coupling can be reliably made with a relatively simple structure. It is possible to lubricate, so that good lubrication is always performed to reliably suppress the generation of hammering noise at the joint part, and the oil can be quickly returned to the cylinder head or camshaft. It is not necessary to add passages, and it is possible to avoid an increase in cost associated with the formation of these passages.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG.
Fig. 3 is a vertical sectional view taken along line -A, Fig. 3 is a lateral sectional view taken along line BB in Fig. 4, Fig. 4 is an exploded perspective view of the same, and Fig. 5 is a perspective view of a cam bracket. FIG. 6 is a longitudinal sectional view showing a conventional example. 1 ... Cylinder head, 2 ... Cam shaft, 3 ... Distributor, 4 ... Bearing part, 6 ... Cam bracket, 8 ... Lubrication hole, 9 ... Recess, 10 ... Shaft joint, 15 ...
… Bearings, 20 …… Covers, 28 …… Guide ribs, 29 ……
Left and right guide ribs.

Claims (1)

[Claims] 1. A cam bracket for bearing a camshaft in an engine in which an auxiliary machine is disposed coaxially with a camshaft on a cylinder head, and the rotational force is transmitted from the camshaft to the auxiliary machine through a shaft coupling. A cover portion that covers the upper portion of the shaft coupling is formed, and a concave portion that collects oil scattered in the cam chamber is formed on the upper surface of the cover portion, and a guide groove is circumferentially formed on the inner peripheral surface of the cover portion above the shaft coupling. A lubricating device for an engine, characterized in that an oil supply hole is formed to open in the recess and the guide groove, and strip-shaped oil cut portions located on both sides of the oil supply hole are formed in the guide groove in the axial direction.