JPH0533682Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to an engine lubrication system, and more specifically, a chain cover that covers a timing chain, and housings for an oil pump and a pressure regulator are integrated. The present invention relates to a lubricating device for an engine formed in

(Prior Art) Generally, in a vehicle engine, an oil pump is driven by rotational power transmitted from the crankshaft through gears, chains, etc., and this transfers lubricating oil from the oil pan to the engine. The oil is supplied to each lubricating part. Since the discharge pressure from the oil pump increases approximately in proportion to the engine speed, a pressure regulator is provided to maintain a constant oil pressure even during high-speed rotation and to prevent oversupply. , which opens to relieve oil when the pressure exceeds a predetermined level.

Conventionally, a lubricating device equipped with such a pressure regulator is known in which both the pressure regulator and oil pump housings are integrally formed with a cover that covers the front surface of the cylinder block. (See, for example, Japanese Utility Model Application Publication No. 137809/1983). In this type, the oil pump is attached to the crankshaft and is directly driven by the rotational force of the crankshaft, and the pressure regulator is arranged in a direction perpendicular to the crankshaft. .

It is also known that the oil pump and pressure regulator housings are integrally formed with a chain cover that is attached to the outer surface of the engine body to cover the timing chain (for example, Japanese Patent Laid-Open No. 57-131808 (see publication). In this case as well, the oil pump is attached to the crankshaft and driven directly by the rotational force of the crankshaft, and the pressure regulator is arranged in a direction perpendicular to the crankshaft. .

Furthermore, it is known that both the housings of the oil pump and the pressure regulator are integrally formed with the cover of the main bearing for rotatably supporting the crankshaft (for example, see Utility Model Publication No. 52-53860). reference). In this device, the oil pump is placed below the crankshaft and parallel to the crankshaft, and is driven to rotate through gears, and the pressure regulator is placed parallel to the crankshaft. It is located in

(Problem to be solved by the invention) By the way, in the above-mentioned Japanese Utility Model Application Publication No. 137809/1983, the cylinder block cover for integrally forming the cylindrical housing of the pressure regulator is relatively thick. Therefore, even if the cylindrical housing is integrally formed in a direction perpendicular to the crankshaft, that is, in a direction along the surface of the cylinder block cover, it can be kept within the thickness of the cylinder block cover itself. There is no need to particularly increase the thickness in the crankshaft direction.

However, when the pressure regulator is provided on the cylinder block cover, it is not easy to remove the cylinder block cover, and therefore maintenance and inspection of the pressure regulator cannot be easily performed.

Therefore, it is conceivable to form the pressure regulator into a chain cover that can be relatively easily attached to and detached from the engine body.

However, since the timing chain is placed directly behind this chain cover, if the pressure regulator housing is formed near the timing chain on the back of the chain cover, interference with the timing chain can be avoided. As a result, the overall dimension of the engine in the crankshaft direction increases accordingly. For this reason, in the above-mentioned Japanese Utility Model Application Publication No. 57-131808, the housing of the pressure regulator is formed by protruding outward from the engine body from the chain cover located at a distance in the direction orthogonal to the timing chain and the crankshaft. However, if it protrudes outside the engine body, the freedom of layout of other equipment placed on the front side of the engine will be restricted, and a special pipe will be provided to circulate the relief oil back to the oil pan. The need for such things arises.

On the other hand, as proposed in the above-mentioned Japanese Utility Model Publication No. 52-53860, it is possible to integrally form an oil gear lary that communicates with the pressure regulator and oil pump positioned in the direction of the crankshaft for the chain cover. Conceivable.

In this case, the cylindrical housing of the pressure regulator is arranged in the crankshaft direction within the range of the thickness of the chain cover in the crankshaft direction, and the cylindrical housing of the pressure regulator is disposed in the direction perpendicular to the crankshaft at the rear end position of the housing in the crankshaft direction. Since an oil gear lary that extends and intersects is provided, the chain cover needs to be considerably thick in the crankshaft direction to accommodate the housing and gear lary. For this reason, the chain cover itself simply covers and protects the timing chain, and in order to make the engine dimensions more compact in the direction of the crankshaft, the chain cover itself is designed to be relatively thin, but the pressure Integrating the regulator increases the size of the engine.

Furthermore, it is necessary not only to simply return the oil relieved from the pressure regulator to the oil pan side, but also to make effective use of the relief oil.

The present invention was devised in view of these circumstances, and its purpose is to prevent an increase in engine dimensions in the crankshaft direction without restricting the degree of freedom in layout, while also providing The purpose is to promote lubrication of timing chains, etc. with relief oil from the shear regulator.

(Means for solving the problem) In order to achieve the above object, the invention described in the utility model registration claims includes an oil pump attached to the crankshaft so as to be directly driven by the rotation of the crankshaft, It is equipped with a pressure regulator that relieves the oil discharged from the oil pump, and includes a crankshaft sprocket fixed to the front end of the cylinder block of the crankshaft, and a pressure regulator located above the crankshaft sprocket. A timing chain is wound between the timing chain and the camshaft sprocket, and a chain cover is attached to the front end surface of the cylinder block to cover the timing chain. It is assumed that the cylindrical housing of the pressure regulator, which communicates with the housing of the pump and extends in a direction parallel to the crankshaft, is formed integrally with the chain cover.

In this device, the housing of the pressure regulator extends vertically from the inner surface of the chain cover located above the crankshaft to the cylinder block side between the crankshaft and the camshaft. Protrude between a pair of timing chains. A relief hole is formed in the housing of the pressure regulator and opens downward so as to face the crankshaft sprocket.

(Function) With the above configuration, in the invention described in the claimed scope of utility model registration, the cylindrical housing of the pressure regulator is connected to the driving side and the driven side from the inner surface of the chain cover located above the crankshaft. It is integrally formed with the chain cover so that it protrudes into the space between the timing chains.
Even if the cylindrical housing is arranged in the direction of the crankshaft, effective use of the space between the timing chains prevents the engine dimensions from increasing in the direction of the crankshaft, and eliminates any protrusions to the outside of the engine body. There is no restriction on the freedom of layout.

Moreover, since the relief hole of the pressure regulator is opened downward to face the crankshaft sprocket, the relief oil spouted from the relief hole can damage the crankshaft, crankshaft sprocket, and timing chain. This will promote lubrication.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an engine lubricating system according to an embodiment of the present invention, in which 1 is an oil pump, 2 is a housing on the front side of this oil pump, 3 is a chain cover 3, 4 is an engine, and 5 is a pressure leg. 6 is the crankshaft.

As shown in FIG. 3, the engine 4 includes a cylinder block 14 and a cylinder block 1.
The cylinder block 14 is basically composed of a cylinder head 17 disposed above the cylinder block 14, and an oil pan 10 disposed below the cylinder block 14. The crankshaft 6 is disposed in the cylinder block 14 in the front-rear direction (horizontal direction in FIG. 1), and the camshaft 18 is disposed in the cylinder head 17 parallel to the upper position of the crankshaft 6. has been done. A crankshaft sprocket 6a is fixed to the front end of the crankshaft 6 protruding from the front end side of the cylinder block 14, and this crankshaft sprocket 6a and the camshaft sprocket 18 of the camshaft 18 are connected to each other.
A timing chain 19 is wound around the camshaft 18 so that the driving power of the crankshaft 6 is transmitted to the camshaft 18. Further, another crankshaft sprocket 6b is also fixed to the crankshaft 6,
A balancer chain 27 is wound around this crankshaft sprocket 6b. The chain cover 3 for covering the timing chain 19 and balancer chain 27 is attached to the mounting flange 14a on the front end surface of the cylinder block 14 with bolts (not shown).

The oil pump 1 is connected to the chain cover 3.
a front housing 2 integrally formed with the
Correspondingly, there is a plate-shaped back housing 7 that is adhered and fixed from the rear side, an outer rotor 8 that is assembled between both 2 and 7, and this outer rotor 8.
It is constructed in a trochoidal manner with an inner rotor 9 meshing with the inner rotor 9. The outer rotor 8 is clamped and fixed between the housings 2 and 7, the inner rotor 9 is fixed to the crankshaft 6, and the oil pump 1 is directly driven by the rotation of the crankshaft 6. ing.

A suction pipe 1 whose tip is introduced into the oil pan 10 is connected to the suction port at the bottom of the oil pump 1.
1 is connected, and the discharge port at the top of the oil pump 1 is
It is connected to the lower end of a discharge passage 12 formed by the chain cover 3 and the back housing 7.
As shown in FIG. 2, the upper end of this discharge passage 12 is
Suction port 13 to the pressure regulator 5
The oil pump 1 is connected to the inlet 16 of the main oil passage 15 via the main oil passage 15.
The oil discharged from the cylinder block 14 is supplied into the cylinder block 14 (see Figure 1).

The pressure regulator 5 includes a cylindrical housing 5 integrally formed with the chain cover 3.
A, a plunger 22 as a valve body that is slidably inserted into the housing 5a, and a spring 24 that biases the plunger 22.

The housing 5a is connected to the chain cover 3.
The plunger 2 is attached to the boss portion 20 integrally formed with the plunger 2.
A mounting hole 21 for accommodating the holder 2 is formed by drilling. The boss portion 20 is located above the crankshaft 6, and is connected to the chain cover 3 at an intermediate position between the driving timing chain 19a and the driven timing chain 19b, which extend in the vertical direction when viewed from the front (see FIG. 3). It projects rearward (to the right in FIGS. 1 and 2) parallel to the crankshaft 6 from the inner surface of the timing chain 6, and is disposed in the space between the timing chains 19a and 19b.

A base 23 is screwed and fixed to the rear end of the mounting hole 21, and one end of the spring 24 is supported by the base 23. The other end of this spring 24 connects the plunger 22, and the front end opening of the mounting hole 21 communicates with the suction port 13, and the plunger 22 receives a compressive restoring force from the other end of the spring 24 to close the front end opening. It's becoming like that. Further, a relief hole 25 is opened downward on the lower surface of the front end side of the housing 5a so as to face the crankshaft 6 and the crankshaft sprocket 6a. The relief hole 25 and the suction port 13 are communicated with each other by being pushed by the hydraulic pressure and retreating against the spring 24, so that the oil is relieved. As a result, the main oil passage 15
The oil pressure inside the engine is always maintained below a predetermined value to prevent excessive oil supply during high-speed rotation. Then, the relief oil scattered from the relief hole 25 is applied to the balancer chain 27, timing chain 19, and both crankshaft sprockets 6a, 6b, and after lubricating these, it passes through the space inside the chain cover 3 and flows into the oil pan 10 below. It is starting to be circulated.

Note that 26 in FIG. 2 is an air vent hole communicating with the atmosphere.

In the engine lubricating device configured as described above, the cylindrical housing 5a of the pressure regulator 5
However, the chain cover 3 located above the crankshaft 6
Since the cylindrical housing 5a is integrally formed with the chain cover 3 so as to protrude from the inner surface thereof into the space between the pair of timing chains 19a and 19b on the drive side and the driven side, the cylindrical housing 5a is Even if the timing chains 19a and 19b are arranged, the space between the timing chains 19a and 19b can be effectively utilized to prevent the engine size from increasing in the direction of the crankshaft 6. For this reason, compared to the conventional device in which the pressure regulator housing protrudes outside the engine body in a direction perpendicular to the crankshaft, there is no need to protrude to the outside of the engine body, allowing for freedom in layout. You can increase it without limiting it. Moreover, compared to the case where the housing of the pressure regulator is integrally formed on the inner surface of the chain cover 3 near the oil pump 1 in a direction perpendicular to the crankshaft 6,
The crankshaft 6 of the entire engine 1 can avoid interference with the timing chain 19 and the like.
There is no need to increase the directional dimension.

Moreover, the relief hole 25 of the pressure regulator 5 is connected to the crankshaft sprocket 6a, 6.
Because it opens downward to face b.
The relief oil spouted from the relief hole 25 can promote lubrication of the crankshaft 6, crankshaft sprockets 6a, 6b, timing chain 19, balancer chain 27, etc. Since the front end edge of the oil pan 10 is extended to and connected to the lower end of the chain cover 3, the relief oil from the relief hole 25 can be circulated without providing a special relief oil recovery pipe.

Further, since the pressure regulator 5 can be attached to the chain cover 3 in advance, ease of assembly can be improved. Furthermore, in the use stage, by removing the chain cover 3, the pressure regulator 5 can also be taken out together with it, making maintenance and inspection extremely easy.

(Effect of the invention) As explained above, the engine lubrication device described in the claims for utility model registration is applicable to an engine in which both the housings of the oil pump and the pressure regulator are integrally formed on the chain cover. Then, the cylindrical housing of the pressure regulator is integrated with the chain cover with the cylindrical housing protruding from the inner surface of the chain cover located above the crankshaft into the space between the pair of timing chains on the driving side and the driven side. Therefore, even if the cylindrical housing is disposed in the crankshaft direction, the space between the timing chains can be effectively utilized to prevent an increase in engine dimensions in the crankshaft direction.

For this reason, compared to the conventional device in which the pressure regulator housing protrudes outside the engine body in a direction perpendicular to the crankshaft, there is no need to protrude to the outside of the engine body, allowing for freedom in layout. You can increase it without limiting it. Furthermore, compared to the case where the pressure regulator housing is integrally formed on the inner surface of the chain cover near the oil pump in a direction perpendicular to the crankshaft, interference with the timing chain etc. can be avoided and the above-mentioned There is no need to increase the overall dimension of the engine in the crankshaft direction to avoid interference with the timing chain.

Moreover, since the relief hole of the pressure regulator is opened downward to face the crankshaft sprocket, the relief oil spouted from the relief hole can cause damage to the crankshaft,
It is possible to promote lubrication of the crankshaft sprocket, timing chain, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of the engine lubricating system of the present invention, Fig. 2 is a sectional view of the main parts of the pressure regulator, and Fig. 3 is a front view showing the mounting position of the pressure regulator. This is a cross-sectional view taken along the - line in FIG. 1. 1...Oil pump, 2...Housing, 3...
... Chain cover, 4 ... Engine, 5 ... Pressure regulator, 5a ... Cylindrical housing, 6 ... Crankshaft, 6a, 6b ... Crankshaft sprocket, 14 ... Cylinder block, 1
8...Camshaft, 18a...Camshaft sprocket,
25... Relief hole.

Claims (1)

[Claims for Utility Model Registration] The oil pump is equipped with an oil pump attached to the crankshaft so as to be directly driven by the rotation of the crankshaft, and a pressure regulator that relieves the oil discharged from the oil pump. A timing chain is wound between the crankshaft sprocket fixed to the front end of the cylinder block of the crankshaft and the camshaft sprocket positioned above the crankshaft sprocket, and covers the timing chain. A chain cover is attached to the front end surface of the cylinder block, and the chain cover has a housing for the oil pump and a pressure leg that communicates with the oil pump housing and extends in a direction parallel to the crankshaft. In an engine lubricating device in which a cylindrical housing of a pressure regulator is integrally formed with the chain cover, the housing of the pressure regulator is connected from an inner surface of the chain cover at a position above the crankshaft. It protrudes between a pair of timing chains extending vertically between the crankshaft and camshaft on the cylinder block side, and a relief hole is provided in the housing of the pressure regulator. A lubricating device for an engine, characterized in that it is opened downward so as to face the crankshaft sprocket.