JPS6313376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a relief oil guide device applied to automobile engines and the like.

[Prior Art] This type of engine generally uses an oil pump to pump up oil from the oil pan and forcefully send it to various parts of the engine as lubricating oil.
When the pressure of the oil discharged from the oil pump rises above a set pressure, a portion of the oil is released into the crankcase via a relief valve, and the released oil is returned to the oil pan by its own weight. There are many people who have done this.

However, with such a configuration, when the relief valve opens and high-pressure oil is forcefully jetted out from the oil relief hole of the relief valve, the oil becomes a mist and tends to diffuse into the crankcase.
Therefore, there are problems in that the chances of contact between the oil and the blow-by gas increase, which promotes deterioration of the oil, and also leads to an increase in the size of the oil separator provided in the blow-by gas reducing device. Also,
In such a device, when high-pressure oil spurts out from the oil relief hole of the relief valve and expands rapidly, or when the oil jetted out from the oil relief hole hits an opposing object that is in front of the oil relief hole, There is a problem in that a loud noise is generated when a collision occurs. Particularly, as shown in Fig. 1, in an engine of the type in which an oil pump a is integrated into a cover c attached to the end of a cylinder block b, oil ejected from an oil relief hole e of a relief valve d flows into the cylinder. This has the disadvantage that it collides with the end face _b1 of block b and makes a loud noise.

Therefore, various types of oil relief holes have been developed in which the oil escape hole is not directly exposed inside the crankcase, and examples of the prior art include the following.

First, as shown in Japanese Patent No. 135782, there is a system in which an oil guide path is connected to an oil relief hole of a relief valve, and this oil guide path is guided into the oil surface of an oil pan (hereinafter referred to as This technique will be referred to as the "first prior art").

Also, Utility Application No. 54-6651 (Utility Application No. 55-106772)
As described in the specification and drawings attached to the application No. 1), some relief valves are provided with a baffle plate or a cover around the oil relief hole.
(Hereinafter, this technique will be referred to as the "second prior art").

Furthermore, as shown in Japanese Utility Model Publication No. 60-23446, a pipe with the same diameter as the relief oil relief hole is connected to the relief oil relief hole instead of a baffle plate or cover, and a pipe cut-off is installed at the end of the relief oil relief hole. Some devices are provided with an opening having an opening area smaller than the area (hereinafter, this technique will be referred to as the "third prior art").

Furthermore, as shown in Japanese Utility Model Application Publication No. 53-45333, there is also a cylinder block in which a cover with fins is provided on the outer wall of the cylinder block, and a relief passage is formed between the cover and the cylinder block outer wall. (Hereinafter, this technology will be referred to as the "fourth prior art").

[Problems to be solved by the invention] However, the first prior art requires a long pipe, which not only leads to increased costs, but also requires prevention of interference between the pipe and the crankshaft. Therefore, there is a problem that assembly workability deteriorates.

Further, in the second prior art, the noise generated when the jet from the oil relief hole collides with the baffle plate or cover is transmitted to the outside from the large opening directly below. In addition, there is a problem in that the oil jet collides with a cover or the like and becomes fine, which then flows out as oil mist from an opening in the cover or the like, increasing the amount of oil mist in the blow-by gas.

Furthermore, if the relief oil escape hole and the pipe have the same diameter as in the third prior art,
The relief oil discharged from the relief oil escape hole reaches the opening without being decelerated, and is vigorously jetted out from the opening. As a result, the oil jet collides with obstacles and the oil surface, producing a large amount of noise.

Furthermore, in the fourth prior art, the relief oil jetted from the relief hole hits the cover that forms the outermost wall, so there is a problem in that the sound is likely to leak directly to the outside.

The present invention aims to solve all of these problems and to prevent problems caused by the oil escape hole being exposed inside the crankcase.

[Means for Solving the Problems] In order to achieve the above objectives, the present invention employs the following configuration.

That is, the engine relief oil guide device according to the present invention has an internal space in the oil relief hole of the hydraulic pressure adjustment relief valve that communicates with the engine's oil pump, the vertical dimension and the depth dimension each being larger than the inner diameter of the oil relief hole. A housing-shaped lid body having a cylinder block is connected, an opening with an area smaller than the bottom area is provided on the bottom surface of the lid body, and this lid body is attached to the outer wall of the cover attached to the end face of the cylinder block. It is characterized by being positioned so that it does not come into direct contact.

[Function] With this configuration, the oil escape hole is covered by the lid, so oil is not directly injected into the crankcase.

Furthermore, since a long pipe is not required, there is no problem of interference between the pipe and the crankshaft.

Moreover, the vertical dimension and the depth dimension of the internal space of the lid body are set larger than the inner diameter of the oil relief hole, and the inner diameter of the opening provided on the bottom surface of the lid body is set smaller than the depth dimension. As a result, the following effects can be obtained. That is, the oil jet ejected from the oil relief hole is decelerated within the internal space, which has a large vertical dimension and a large depth dimension. Since the area of the opening is set smaller than the bottom area of the lid, a pool of oil will be formed in front of the opening, and the accumulated oil will be sequentially poured into the opening. It will flow down from the department. As a result, the accumulated oil can suppress noise caused by rapid oil diffusion or collision from propagating to the outside of the lid. Further, since the finely divided oil is captured by this oil pool, it is possible to prevent oil mist from scattering into the crankcase. Furthermore, since the oil that has once accumulated loses momentum and flows down from the opening, the problem of the oil jet colliding with the oil surface in the oil pan and making noise is also suppressed.

Furthermore, since the lid body is not in direct contact with the outer wall of the cover, the sound generated when the relief oil is sprayed onto the lid body does not directly leak to the outside.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 2 to 4.

An oil pump 1 for supplying lubricating oil A to various parts of the engine is provided on a cover 3 attached to the front end of a cylinder block 2. That is, the oil pump 1 is an internal gear type housed in a cylindrical casing 1a integrally formed with the cover 3, and is driven directly by a crankshaft 4 passing through the cover 3. It has a function of sending the oil A in the oil pan 7, which has been pumped up through the strainer 5 and the oil lifting pipe 6, to each part of the engine through the oil sending port 8 provided in the cover 3. In addition, the oil feed port 8
A relief port 9 is branched from the middle, and a relief valve 11 is provided at the terminal end of the relief port 9. The relief valve 11 includes a cylindrical valve box 13 that is integrally provided with the cover 3 and has a tapered seat surface 12 on the inner periphery of the upper end, and a valve body 14 that is slidably fitted into the valve box 13. And this valve body 1
4 in the direction of the seat surface 12, and an oil escape hole 16 that is bored in the valve box 13 and opens when the valve body 14 is separated from the seat surface 12 by a predetermined distance or more. It's something...
The oil escape hole 16 is opened toward the front end surface 2a of the cylinder block 2. Then, the oil relief hole 16 is connected to the oil relief hole 16.
A cover body 17 is connected to the cylinder block to prevent the oil A spouted from the engine from spreading into a mist and to prevent the oil A from colliding with an opposing object (in this embodiment, the front end surface 2a of the cylinder block). The lid body 17 has _a housing shape that surrounds the oil relief hole ₁₆ , and as shown in FIG. It is set larger than the inner diameter D1 of the hole 16. An opening 19 having an area smaller than the bottom area is opened toward the oil level 18 on the bottom surface 17a.

With such a configuration, when the pressure of the oil A discharged from the oil pump 1 exceeds the set pressure, the valve body 14 of the relief valve 11 is moved by the spring 1.
5 to a position below the oil relief hole 16, the oil A introduced into the valve box 13 through the relief port 9 flows inside the lid body 17 connected to the oil relief hole 16. space 17b
will be guided to. The oil A guided into the lid 17 is returned to the oil pan 7 through an opening 19 provided in the bottom surface 17a. At this time, the oil jet ejected from the oil relief hole 16 of the relief valve 11 into the internal space 17b of the lid body 17, which has a vertical dimension L ₁ and a depth dimension L ₂ larger than its inner diameter D ₁ , is As schematically shown in Figure 4, some of the particles collide with the inner wall surface of the lid body 17 and become fine, but the momentum decreases due to the rapid expansion of the flow path at the ejecting part. It will be done. Since the area of the inner diameter of the opening 17b of the lid 17 is set smaller than the bottom area of the lid 17, the oil A pools B in front of the opening 17b.
is formed, and the accumulated oil A sequentially flows down from the opening 17b.
Therefore, the accumulated oil A can effectively suppress noise caused by rapid diffusion or collision of the oil A from propagating to the outside of the lid body 17.
Further, since the finely divided oil A is captured by this oil A reservoir B, it is also possible to effectively prevent oil mist from scattering into the crankcase. Since the oil A that has once accumulated loses momentum and flows down from the opening 19, the problem of the oil jet colliding with the oil surface 18 in the oil pan 7 and making noise is also suppressed. Moreover,
Since the lid 17 is not in direct contact with the outer wall 3a of the cover 3, the sound generated when the relief oil A is sprayed onto the lid 17 does not leak directly to the outside.

It goes without saying that the opening of the lid may be opened toward a region other than the oil surface.

[Effects of the invention] Since the present invention has the above-mentioned configuration, it may cause deterioration of assembly workability, the oil jet may be violently sprayed on the oil surface of the oil pan, or the oil jet may collide with the wall surface. It is possible to prevent the oil relief hole from being directly exposed inside the crankcase without causing problems such as the sound being transmitted directly to the outside. To effectively reduce noise, and to prevent finely divided oil from scattering, thereby suppressing oil deterioration due to contact with blow-by gas and enlargement of the oil separator due to an increase in the amount of oil mist. It is possible to provide an engine relief oil guide device that can perform the following.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is an explanatory diagram of the operation of the same embodiment. It is. 1...Oil pump, 11...Leaf valve, 16
...Oil escape hole, 17...Lid, 17a...
Bottom surface, 17b...inner space, 19...opening, A
...Oil, D ₁ ...Inner diameter of oil relief hole, L ₁
... Vertical dimension of the internal space, L ₂ ... Depth dimension of the internal space.

Claims (1)

[Scope of utility model registration request] Connecting to an oil relief hole of a hydraulic pressure adjustment relief valve leading to an oil pump of an engine, a housing-shaped lid body having an internal space whose vertical dimension and depth are each larger than the inner diameter of the oil relief hole; An engine characterized in that an opening having an area smaller than the bottom area is provided on the bottom surface of the lid body, and the lid body is positioned so as not to come into direct contact with the outer wall of the cover attached to the end surface of the cylinder block. Relief oil guide device.