JPH0623716Y2 - Supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a supercharger, and more particularly to a structure of a gear chamber of a mechanical supercharger.

(Prior Art) One of the superchargers that is used to forcibly send a large amount of air into the combustion chamber of an engine to improve intake efficiency, and uses the torque of the crankshaft as a drive source to rotate the rotor of the compressor. There is known a mechanical supercharger.

This mechanical supercharger has a main body 1 as shown in FIG.
Has a supercharging chamber 1A and a gear chamber 1B inside thereof.
Is provided with a pair of cocoon-shaped rotors 2 and 3 forming a compressor so as to be rotatable.

On the other hand, in the gear chamber 1B, gears 4 and 5 fixed to one end of the rotor shafts 2a and 3a are meshed, and the gears 4 and 5 and bearings are lubricated and the supercharging chamber is sealed. A proper amount of oil is enclosed in. Although not shown, the amount of this oil can be detected by a level gauge inserted in the gear chamber 1B.

The support shaft 2a penetrates the gear chamber 1B and projects to the outside of the main body 1, and a pulley 6 containing an electromagnetic clutch is fixed to the projection. The pulley 6 is driven by a crankshaft side pulley via a belt to drive the rotors 2 and 3.

(Problems to be solved by the invention) In such a mechanical supercharger, for example, when high-speed, high-load operation is performed, the temperature of the oil in the gear chamber rises due to agitation of the oil in the gear chamber. However, the temperature of the air in the gear chamber also rises due to heat transfer from the supercharging chamber side, which may increase the pressure in the gear chamber. When the pressure in the gear chamber reaches a pressure that exceeds the pressure limit of the oil seal in the bearing portion, there is a problem that the oil intervening in the bearing portion leaks out.

In order to solve this problem, it is known that an air vent hole for communicating the inside of the gear chamber with the outside is purposely provided in the wall of the gear chamber.

(Means for Solving the Problems) The present invention utilizes a level gauge mounting port inserted into the oil amount detection port of the gear chamber or a plug mounted on the oil supply port of the gear chamber to connect the gear chamber to the outside. In a mechanical supercharger for rotating a rotor in a supercharging chamber by using the rotation of a crankshaft as a driving force to supercharge, a transmission attached to a support shaft of the rotor. Gears and oils for lubrication and oil sealing of these gears are stored, and a plug attached to an oil amount detection port or an oil supply port provided in a gear chamber formed at a position adjacent to the supercharging chamber, An exhaust passage formed inside the plug and communicating the inside of the gear chamber with the outside of the gear chamber, a check valve provided in the exhaust passage, and an outside of the gear chamber of the exhaust passage mounted on the plug. The opening to A breather cap made of an elastic body is opened by deforming the breather cap when the pressure inside the breather cap exceeds a predetermined pressure, and the breather cap is provided to communicate the opening and the outside. With a notch.

(Operation) According to the present invention, the check valve is opened to reduce the pressure in the gear chamber before the pressure in the gear chamber reaches a value corresponding to the pressure limit of the oil seal, and the pressure in the breather cap is kept at a predetermined level. When the pressure is exceeded, the breather cap elastically deforms, the notch of the breather cap opens,
Air is exhausted outdoors.

(Embodiment) In FIG. 1, a plug indicated by reference numeral 10 is a plug body 10A screwed into an oil amount detection port formed in a wall of a gear chamber 1B (FIG. 4) of a supercharger, and this plug. Body 10A
The plug body 10A includes a head 10a and a bolt 10b integral with the head 10a.
The base of the level gauge 11 for detecting the liquid level in the gear chamber 1B is fixed to the lower end of the bolt 10b. A neck portion 10d having a flange 10c at the upper end is integrally formed with the head portion 10a of the plug body 10A.

A through hole 10e is formed in the center of the plug body 10A so as to vertically penetrate the plug body 10A.
A female screw is formed on the inner peripheral surface of the upper half portion of 0e, and the socket 12 is screwed into the female screw.

The socket 12 has a large diameter portion and a vent hole 12a formed therein along the axial direction, and a tubular valve seat 15 is press-fitted and fixed to the lower end opening of the large diameter portion.

A ball 14 is placed on the upper end of the valve seat 15, and is biased toward the valve seat 15 side by the compression spring 13 to normally close the upper end opening of the valve seat 15.

The valve seat 15, the ball 14 and the compression spring 13 compose a check valve, and the elasticity of the compression spring 13 is set so as to open the valve below a value at which the oil sealing breaks. Is set to the strength at which the check valve is opened when the pressure in the gear chamber reaches 230 mmHg.

The breather cap 10B is made of an elastic material such as rubber having water resistance, has a space 10B1 that can cover above the through hole 10e of the plug 10A, and has a collar 10Bf formed at the inner peripheral edge of the lower end of the neck 10d. It is attached to the head 10a by elastically engaging with.

The space 10B1 of the breather cap 10B is the peripheral wall 10B.
It is surrounded by 2, and a donut-shaped space 10B3 is formed around the peripheral wall 10B2.
3 is surrounded by the outer peripheral wall 10B4.

The space 10B1 has a diameter equal to that of the flange 1 of the plug 10A.
It has an overhanging portion 10B5 that is set smaller than the outer diameter of 0c and is formed so as to enclose the flange 10c. A cutout 10B6 is formed in a shoulder portion of the meat portion 10B5 that faces a lower end edge of the outer peripheral wall 10B4. The cutout 10B6 communicates the donut-shaped space 10B3 with the outside of the breather cap 10B. There is.

A notch 10B7 is formed in a part of the peripheral wall 10B2 forming a partition wall between the spaces 10B1 and 10B3, the notch 10B7 penetrating the peripheral wall 10B2 in the right downward direction in the drawing. This cut 10B7
When viewed from the front, it is formed in an arc shape as shown in FIG.

As shown in FIG. 1, the notch 10B7 has a peripheral wall 10B2.
Since it penetrates diagonally, it becomes a form in which lip pieces are overlapped, and this lip piece opens by elastic deformation of the breather cap when the pressure inside the breather cap exceeds the atmospheric pressure, and the space 10B1 and the outside And 10B
3. Communicate through the notch 10B6.

The plug 10 having the structure described above includes the bolt 10b.
As shown in FIG. 4, when the pressure in the gear chamber 1B is 230 mmHg or less, the compression spring 13 is installed by screwing it into the oil amount detection port formed in the wall of the gear chamber 1B.
The ball 14 maintains the state in which the ball 14 blocks the through hole 10e.

When the compression in the gear chamber 1B exceeds 230 mmHg, the ball 14 resists the elasticity of the compression spring 13 and the valve seat 15 is pressed.
Away from, the check valve is opened to open the through hole 10e, the air in the gear chamber 1B enters the space 10B1 through the through hole 10e, and the peripheral wall 10B2 is elastically deformed due to the pressure increase in the space 10B1. Making a notch 10B7
Is opened and discharged to the outside through the space 10B3 and the notch 10B6.

According to this embodiment, the socket 12 that houses the compression spring 13 and the ball 14 that form the check valve is screwed into the plug 10A as a check valve unit.
When changing the elasticity of the compression spring 13, this replacement becomes easy.

Next, another embodiment of the present invention will be described with reference to FIG.

In this embodiment, the ball 22 forming the check valve is plugged into the plug 2
The compression spring 23 directly presses the upper end opening of the zero through hole 20a.

The ball 22 and the compression spring 23 have a plug 20 at the lower end opening.
It is housed in a cap-shaped container 21 which is fixed to the flange 20c by caulking. A ventilation hole 21a is formed in a part of the peripheral wall of the container 21.

The compression spring 23 has the same elasticity as the compression spring 13 in the embodiment shown in FIG.

The head 20A of the plug 20 is covered with a breather cap 24. This breather cap 24 is used for the container 21.
A peripheral wall 24B surrounding the container 21 via a space 24A surrounding the peripheral wall 24A, and an outer peripheral wall 24D surrounding the peripheral wall 24B via a space 24C surrounding the peripheral wall 24B. The peripheral wall 24B is formed on the inner peripheral edge of the lower end of the peripheral wall 24B. Tsubomi 24b is plug 2
It is engaged with the flange 20c of No. 0 through the container 21.

A part of the peripheral wall 24B is provided with a cutout 24B1 that penetrates the peripheral wall 24B in the right downward direction in the drawing. Space 24C
The breather cap 24 and the outside of the breather cap 24 communicate with each other through a cut groove 24B2 formed in a lower portion of the peripheral wall 24B.

The plug 20 of this embodiment is also mounted by being screwed into the wall portion of the gear chamber 1B, as in the embodiment of FIG.

Then, the pressure in the gear chamber 1B is a predetermined value (230 mmHg)
In the following state, the ball 22 closes the through hole 20a by the biasing force of the compression spring 23, and when the pressure in the gear chamber 1B rises and exceeds a predetermined value (230 mmHg), the ball 22 is compressed by the compression spring 23. The through hole 20a is opened against the resilience and the air in the gear chamber 1B is introduced into the housing body 21.
The air that has entered the container 21 enters the space 24A through the vent holes 21a, and the pressure in the space 24A rises, causing the peripheral wall 24B to elastically deform and make a cut 24B.
1 is opened and discharged to the outside through the space 24C and the cut groove 24B2.

FIG. 6 shows a modification of the check valve. The depiction of the breather cap is omitted.

The upper end of the level meter 30 is fixed to the plug 31 by caulking, and the air passage 30 communicating with the gear chamber 1B is provided.
a is formed.

The plug 31 has a through hole 31A formed of a large diameter portion 31a and a small diameter portion 31b communicating with the ventilation portion 30a. A check valve including a ball 32 and a compression spring 33 that presses the ball 32 against the upper end opening of the ventilation path 30a is arranged in the large diameter hole of the through hole 31A. The elastic force of the compression spring 33 is set in the same manner as that in the embodiment shown in FIG.

This plug 31 is also mounted by being screwed into the wall portion of the gear chamber 1B, as in the embodiment of FIG.
When the pressure in the gear chamber 1B does not reach the predetermined value, the ball 32 closes the air passage 30a by the bias of the compression spring 33. Then, when the pressure in the gear chamber 1B reaches a predetermined value, the ball 32 of the check valve separates from the upper end opening of the ventilation passage 30a against the biasing force of the compression spring 33, and the ventilation passage 30a.
Open and allow air to escape to the outside through a breather cap (not shown).

(Effects of the Invention) According to the present invention, the check valve has a check valve that discharges air in the gear chamber when the pressure of the gear chamber rises and reaches a predetermined value, and a cut that opens due to elastic deformation due to the pressure increase. Since the breather cap and the plug used to close the oil supply port provided in the wall of the gear chamber or the hole for oil level detection are provided in the gear chamber wall, there is an air vent hole that connects the gear chamber and the outside. It is possible to prevent the oil seal from being broken due to the pressure rise in the gear chamber without the need to provide it, and the double seal structure with the check valve and the breather cap prevents water and foreign matter from entering the turbocharger. It

[Brief description of drawings]

FIG. 1 is a half sectional view of a plug applied to a supercharger showing an embodiment of the present invention, FIG. 2 is a side view showing only a breather cap provided on the plug, and FIG. FIG. 4 is a sectional view taken along line III-III in FIG. 4, FIG. 4 is a sectional view showing a state in which the plug shown in FIG. 1 is mounted on the wall of the gear chamber of the supercharger, and FIG. FIG. 6 is a half sectional view showing a plug applied to a supercharger according to another embodiment, FIG. 6 is a sectional view showing a modified example of a check valve provided in the plug, and FIG. 7 is a conventional mechanical supercharger. It is sectional drawing which shows an example of a machine. 1 ... Supercharger, 1A ... Supercharging chamber, 1B ... Gear chamber, 10, 20
… Plug, 10B, 24… Breather cap, 10B
7, 24B1 ... Notch, 10e, 20a ... Through hole, 1
3, 23, 33 ... Compression springs, 14, 22, 32 ... Balls, 30a ... Ventilation passages.

Claims (1)

[Scope of utility model registration request] 1. A supercharger for supercharging by rotating a rotor in a supercharging chamber by using a rotation of a crankshaft as a driving force, comprising: a transmission gear attached to a support shaft of the rotor; and lubrication of these gears. A plug for accommodating oil for oil sealing and attached to an oil amount detection port or an oil supply port provided in a gear chamber formed adjacent to the supercharging chamber, and a plug formed inside the plug, An exhaust passage communicating between the inside of the gear chamber and the outside of the gear chamber, a check valve provided in the exhaust passage, and an elastic body attached to the plug for closing an opening of the exhaust passage to the outside of the gear chamber. And a breather cap that is opened by deforming the breather cap when the pressure inside the breather cap exceeds a predetermined pressure, and the breather cap so that the opening and the outside communicate with each other. Turbocharger and having cut and provided on the up, the.