JPS6226569Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is installed in a gas passage, and the reciprocating motion of the valve allows the seat surface of the valve to connect with the seat surface of the valve seat opposite to the seat surface. In a mushroom-shaped valve configured to communicate and block off the above-mentioned passage formed in between,
The present invention relates to a lubricating device for supplying lubricant to the sheet surface.

The device that is equipped with such a mushroom-shaped valve is an internal combustion engine. Accidents such as abrasion, burnout, or breakage of the seat surface may occur due to the presence of solid particles such as combustion residue, the frequent operation, and the large impact on the seat surface during operation. Therefore, it is easy to understand that if the required amount of lubricant can be automatically supplied to the seat surface, it will be effective in preventing accidents and mitigating impacts.

However, a lubricating device that can stably and continuously supply lubricant to the relevant parts under the extremely harsh operating environment described above is superior to conventional devices. The current situation is that there are very few.

(Prior art) Fig. 5 and Fig. 6 show one example of such prior art.
FIG.
52-139948). First, in the case shown in FIGS. 5 and 6, the seating surface 13 corresponding to the valve seat 12 of the intake valve 11 is formed of sintered metal, and an oil supply hole 15 is bored inside the valve rod 14 to provide an oil reservoir. 16 lubricating oil naturally flows down inside the oil supply hole 15 and reaches its lower end, and then permeates into the sintered metal through the radially arranged branch-shaped oil supply holes 17 and oozes out onto the surface. .

However, in such conventional devices, the supply of lubricating oil is left to gravity, and therefore the valve movement is affected by the temperature or properties of the lubricating oil or by fluctuations in engine speed. The drawback is that the supply amount is extremely unstable and unreliable due to speed and other factors, making it impossible to depend on the supply of lubricating oil with confidence.

7, a groove 20 is provided in the valve seat 19 facing the intake valve 18, and one end of a vent hole 22 bored in the cylinder head 21 is communicated with the groove 20.
The other end corresponding to the upstream side is connected to cylinder block 2.
By communicating with the ventilation hole 24 provided in the intake valve 18, the oil mist generated in the crankcase is guided to the ventilation hole 24, and further guided to the groove 20 through the ventilation hole 22, so that when the intake valve 18 is opened, The oil mist particles are attached to the surface in contact with the seat 19 to provide lubrication. However, this conventional method also
As in Figures 5 and 6 above, the degree of generation of oil mist, the resistance or flow condition until it reaches the supply location after a long journey, etc. are affected by the properties of the lubricating oil, temperature, engine speed, etc. The lubricating oil supply means is unavoidably affected by various factors, and as a result, the lubricating oil supply means is extremely passive, resulting in an unstable supply amount and therefore poor reliability.

(Purpose of the invention) This invention was made in view of the above-mentioned drawbacks of the conventional device, and by adding a simple configuration, it is possible to extremely reliably supply lubricant to the seat portion of the valve. The purpose of this invention is to realize a valve lubrication device that can perform stable and positive lubrication operations each time it is operated, and can automatically and continuously perform highly reliable lubrication operations.

(Structure of the device) This device is provided in a gas passage as a structure to achieve the above object, and the reciprocating motion of the valve causes the seat surface of the valve and the seat surface of the valve seat opposite to the seat surface to In a mushroom-shaped valve that communicates and blocks the above-mentioned passage formed between the valve and the valve seat, the opposing seat surfaces of the valve and the valve seat are brought into contact with a slight difference in the inclination angle of the mutual seat surfaces. The contact line is located at the large diameter edge of the seat surface, and an annular groove is formed along the circumference as a reservoir for lubricant that opens on the inside of the seat surface of the valve. A storage chamber for storing the lubricant is provided in the center of the valve body, and a pore bored in a radial direction in the valve body is connected between the storage chamber and the annular groove. Thus, the depth of the annular groove is changed repeatedly by the deformation of the valve that occurs around the contact line between the two seat surfaces as a fulcrum each time combustion pressure is applied to the back surface of the valve. It is characterized by increasing and decreasing depth.

(Example) Next, the configuration of this invented device will be specifically explained based on drawings showing an example. In FIGS. 1 to 3, 1 is a valve and 2 is a valve seat. 3 is the seat surface of the valve, 4 is the seat surface of the valve seat,
The seat surface 3 and the seat surface 4 are separated from each other or come into contact with each other due to the reciprocating movement of the valve 1 in the axial direction, and communicate or block the gas passage. Generally, in a mushroom-shaped valve, the relationship shape between the seat surface 3 and the seat surface 4 is as follows.
As shown in Figure 2, by making a slight difference in the cone angles of the two sheets and making the contact mode a line contact when both sheet surfaces come into contact, the accuracy of passage blocking due to contact between the two sheets can be improved. It is normal to try to improve.
In the present invention, the contact line is located at the contact line 6 at the large diameter end edge of the seat surface 3.

Reference numeral 5 denotes an annular groove carved in the seat surface 3 of the valve, and the groove 5 consists of an opening 5a and a chamber 5b, both of which are provided in an annular shape along the circumference. The chamber 5b functions as a reservoir for sealing the lubricant, and the opening 5a functions as an opening for discharging the lubricant onto the seat surface 3.

Suitable lubricants for use in this device include pastes with relatively high viscosity, poor fluidity, and excellent heat resistance, such as grease, molybdenum disulfide, or a mixture of both. A lubricant with the following properties is selected.

Reference numeral 7 denotes a lubricant storage chamber, which is provided in the center of the valve 1's body. Reference numeral 8 denotes pores drilled in the radial direction within the body of the valve 1, and in the illustrated example, four pores 8 are provided.
Both connect the storage chamber 7 and the groove 5. 9
is an embolus for the storage chamber 7, which is used to open the embolus 9, fill the storage chamber 7 with lubricant in advance, and then seal it.

Next, the operation of the present device will be explained. First, before installing the valve 1 at a predetermined position in the gas passage,
Opening the embolus 9 and filling the storage chamber 7 with lubricant,
After sealing with the embolus 9, the valve 1 is installed in a predetermined position. In response to the operation of the valve 1, the lubricant in the storage chamber 7 uniformly fills the groove 5 through the pore 8, and flows out little by little onto the surface of the seat surface 3 through the opening 5a, lubricating the surface. perform an action. The capacity of the storage chamber 7 is set to be sufficient to sustain the consumption of lubricant due to the above-mentioned outflow over a long period of time.
The number of times lubricant must be resupplied can be extremely reduced.

In the device of the present invention, the lubricant flowing out from the opening 5a onto the surface of the seat surface 3 can be controlled by applying the valve according to the present invention to the supply/exhaust valve of an internal combustion engine. It exhibits the characteristics of maintaining reliability and performing an extremely stable lubrication action, which will be explained below.

Now, when the fuel in the cylinder burns with the supply and exhaust valves of the internal combustion engine closed, combustion pressure acts on the back of valve 1 in the direction of arrow P (Figure 1), and as a result,
The central part of the back surface of the valve 1 is pushed in the direction of the arrow P using the contact line 6 between the seat surfaces 3 and 4 as a fulcrum, causing deformation to take on the shape of an upside-down bowl.

This deformation is caused by the groove 5 being carved.
This phenomenon is more pronounced than in conventional valves without grooves, and as a result, the volume of the grooves 5 increases and decreases repeatedly, albeit slightly, every combustion stroke, repeating the so-called pumping action. Due to this action, the lubricant in the chamber 5b is regularly discharged little by little onto the seat surface 3 from the opening 5a.

A preferred processing procedure for forming the grooves 5 on the sheet surface 3 is shown in FIG. The processing procedure will be explained with reference to the drawings. First, grooves 5 having the shape shown in the drawings are formed on the sheet surface 3, and then pores 8 are formed. These processes can be carried out very easily since the opening width of the opening 5a is wide. Thereafter, the rotary roll R is rotated and moved in the direction of arrow Q along the inclination of the sheet surface 3, and the thin portion 5c is brought down along the sheet surface 3 to increase the opening width of the opening 5a to the width shown in the second figure. After tightening, the entire surface of the sheet surface 3 may be polished.

(Effects of the invention) Since this invention is constructed as described above, by adding a simple structure, it is possible to extremely reliably supply lubricant to the seat portion of the valve in a stable and positive manner every time the valve is operated. This makes it possible to automatically and continuously perform highly reliable lubrication operations, thereby preventing accidents such as wear, burnout, or breakage of the seat surface of this type of valve. Moreover, it has a remarkable effect.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the valve and valve seat according to the present invention;
Figure 2 is an enlarged sectional view of the "" part in Figure 1,
The figure is a plan view of the valve according to the present invention, Figure 4 is an explanatory diagram of the processing procedure for the valve according to the present invention, and Figures 5 and 6 both show an example of a conventional device and a valve. A sectional view with a seat and a partially cutaway plan view of the valve;
FIG. 7 is a sectional view of another example of the conventional device in the vicinity of where the valve is installed. 1... Valve, 2... Valve seat, 3, 4... Seat surface,
5...concave groove, 5a...opening, 5b...chamber, 5c...
...Thin wall portion, 6...Contact line, 7...Storage chamber, 8...
Pore, 9... Embolus.

Claims (1)

[Scope of utility model registration request] A mushroom-shaped tube is provided in a gas passage and communicates and blocks the passage formed between the seat surface of the valve and the seat surface of the valve seat facing the seat surface by the reciprocating movement of the valve. In a valve, there is a slight difference in the inclination angle of the mutual seat surfaces of the valve and the valve seat, and the position of the contact line when the two opposing seat surfaces come into contact is defined as the large diameter edge of the seat surface. An annular groove is carved along the circumference on the inside of the seat surface as a reservoir for lubricant that opens on the seat surface, and a reservoir for storing the lubricant is formed in the center of the valve body. a chamber is provided, and the storage chamber and the annular groove are connected by a pore drilled in a radial direction in the body of the valve;
The depth of the annular groove was determined to be such that the volume of the groove repeatedly increases and decreases due to the deformation of the valve that occurs using the contact line between the two seat surfaces as a fulcrum each time combustion pressure is applied to the back surface of the valve. Valve lubrication system.