KR101577205B1

KR101577205B1 - A vacuum pump for a vechicle

Info

Publication number: KR101577205B1
Application number: KR1020150055161A
Authority: KR
Inventors: 이장호; 김태형; 유승기
Original assignee: 캄텍주식회사
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2015-12-15

Abstract

The present invention relates to a vacuum pump for a vehicle and specifically, to the vacuum pump capable of reducing vibration or noise induced by pressure difference between the inside of a chamber and an external space by the vacuum pump. In order to achieve the objective, the present invention provides the vacuum pump for the vehicle including: a housing where the chamber is formed; a vent pipe which is prepared in the housing; a valve which is arranged on an outer surface of the housing, and opens or closes the vent pipe selectively; and a linkage passage which is prepared on the outer surface of the housing in a groove shape extended from the vent pipe, and is prepared for the chamber to be linked with the outside through the vent pipe under a state that the vent pipe is closed by the valve.

Description

Technical Field The present invention relates to a vacuum pump for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum pump for a vehicle, and more particularly, to a vacuum pump capable of reducing vibrations and noise caused by a pressure difference between a chamber interior and an exterior space during a discharge operation by a vacuum pump.

The vacuum pump generates negative pressure inside the housing by rotation of a rotor and a vane provided in the vacuum pump, and is capable of providing vacuum pressure to a part (for example, a brake booster or the like) It is a kind of part.

As shown in Korean Patent Laid-Open Publication No. 10-2004-0042410, a conventional vacuum pump has a housing in which a chamber for forming vacuum pressure is formed, a rotor rotatably formed in the housing, And a vane that rotates the chamber inside the housing together with the rotor.

The rotor is connected to a camshaft provided in the engine, and rotates by the rotation of the camshaft. The inner chamber of the housing is partitioned into a plurality of spaces by the rotor and the vane, and the volume of the plurality of spaces thus partitioned is varied by the rotation of the rotor and the vane.

The housing is provided with an inflow portion into which air flows and a discharge portion through which air is discharged. Air and oil flow in through the inflow portion due to the rotation of the rotor and the vane, and are discharged to the discharge portion through the chamber inside the housing.

Immediately before the discharge operation is performed by the rotation of the vane, the space communicated with the discharge portion is filled with oil. Since the discharge portion is closed by the valve, a vacuum state is formed therein.

Therefore, the difference between the pressure in the oil-filled space and the pressure in the outside of the housing is greatly increased.

In this state, when the vane moves close to the discharge portion, the oil enters the discharge portion, and the oil is pushed by the push operation of the oil, so that the oil is discharged to the outside of the housing.

When the space in the vacuum state communicates with the outside due to the sudden opening of the valve, the pressure at the inlet of the discharge portion is increased from the vacuum state to the atmospheric state, and sudden pressure change causes noise and vibration in the housing as a whole.

As a result, the rotor and the vane are shaken and adversely affect the stable operation of the vacuum pump.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem and it is an object of the present invention to provide a vacuum cleaner capable of supplying a small amount of air into a housing chamber even when a discharge unit is closed by a valve, The purpose is to reduce noise.

According to an aspect of the present invention, there is provided a plasma processing apparatus comprising: a housing in which a chamber is formed; A discharge hole provided in the housing; A valve disposed on the outer surface of the housing for selectively opening and closing the discharge hole; And a communication passage provided on the outer surface of the housing and provided in a groove shape extending from the discharge hole so that the chamber can communicate with the outside through the discharge hole even in a state where the discharge hole is closed by the valve And a vacuum pump for a vehicle.

Wherein the communication passage is formed by being cut out from a rim of the discharge hole to have a predetermined depth, and an outermost end of the communication passage is disposed so as to extend beyond a region covered by the valve.

Wherein the communication passage includes: A first communication flow path extending from a rim of the discharge hole and extending to the discharge hole side; And a second communication passage extending from the first communication passage and extending beyond the region covered by the valve, the second communication passage being exposed to the outside.

And the distance from the exhaust hole rim to the outermost end of the communication passage is longer than the distance from the exhaust hole rim to the valve side end.

The communication passage may be formed to extend in the direction of the rotation axis of the rotor or may extend in the outward direction.

The bottom surface of the communication passage may be a flat surface, and the bottom surface of the communication passage may be formed as a groove formed in a stepped manner as compared with a surface of the housing.

The bottom surface of the communication passage is inclined downward in the direction of the exhaust hole and is provided in a groove shape formed to be stepped as compared with the surface of the housing.

Wherein a rim of the exhaust hole is provided so as to protrude from an outer surface of the housing and is formed so as to be stepped and to surround the exhaust hole, wherein a part of the rim portion is cut out so that the exhaust hole communicates with the rim outer space at all times And the like.

The effects of the present invention are as follows.

It is possible to provide the chamber, that is, the communication fluid passage, which is provided so that the discharge target fluid accommodation space communicates with the outside through the discharge hole even in the state where the discharge hole is closed by the valve. Therefore, an extreme pressure increase in the vicinity of the discharge hole can be prevented.

That is, the peak pressure point of the pressure is lower than that of the prior art, and the pressure change curve such as the impulse curve disappears because the time for the pressure change is increased.

Therefore, the amount of the shock that the vacuum pump receives is less than that in the prior art, and stable operation is possible.

In addition, while the magnitude of the peak point of the conventional pressure is only different for each cycle, the size of the pressure peak point in each cycle becomes substantially uniform in the present invention, so that a reliable design of the product is possible.

In addition, there is also an advantage that noise due to extreme pressure explosion is reduced compared with the conventional one.

1 is a perspective view of a vacuum pump for a vehicle according to the present invention.
2 is an exploded perspective view of a vacuum pump for a vehicle according to the present invention.
3 is a bottom perspective view of a vacuum pump in which a communication passage according to the present invention is formed.
4 is a bottom perspective view of a conventional vacuum pump for a vehicle in which no communication passage is formed.
5 is a side sectional view and a front sectional view of the communication passage according to the present invention.
6 is a bottom perspective view of a vacuum pump in which a communication passage of another embodiment according to the present invention is formed.
7 is a bottom perspective view of a vacuum pump in which a communication passage of another embodiment according to the present invention is formed.
8 is a plan sectional view showing an operating part of a vacuum pump for a vehicle according to the present invention.
Fig. 9 is a graph showing a change in pressure measured in the vicinity of the discharge hole when the communication passage is not formed and when the communication passage is formed.
10 is a graph showing a change in pressure over a plurality of cycles in the prior art and the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a perspective view of a vacuum pump for a vehicle according to the present invention (hereinafter referred to as "vacuum pump"), and Fig. 2 is an exploded perspective view of the vacuum pump.

1 and 2, a vacuum pump 100 according to an embodiment of the present invention includes a housing 110 having a chamber 111 formed therein, a rotor 110 rotatably installed in the housing 110, 120 and a vane 130 which is fitted across the rotor 120.

A slider 135 is provided on both sides of the vane 130. The slider 135 contacts the inner wall of the chamber 111 to rotate the vane 130 when the rotor 120 and the vane 130 are rotated. To be smoothly performed.

A cover 140 for covering the chamber 111 is provided on the upper surface of the housing 110. The cover 141 is coupled to the housing 110 by a fastening member 145 such as a bolt.

The fastening member 145 is inserted through the first fastening hole 141 provided at the rim of the cover 140 and inserted into the second fastening hole 112 provided at the rim of the housing 110.

An upper sealing member 148 for preventing leakage of air is provided between the cover 140 and the upper rim of the housing 110.

An inlet 160 for introducing air into the outer surface of the housing 110 is provided.

The inflow unit 160 includes an inflow pipe 161 provided in the housing 110, a check valve 162 coupled to the inflow pipe 161 to prevent backflow of the inflow air, And a guide hose 163 for guiding the air to the outside.

A discharge unit 170 is provided on the lower surface of the housing 110. The discharge unit 170 includes a discharge hole 170a provided at the bottom of the chamber 110 of the housing 110, A valve 172 in the form of a plate valve for selectively opening and closing the valve 172 and a stopper 173 for defining and limiting the opening and closing intervals of the valve 172 are provided.

The valve 172 and the stopper 173 are coupled to the lower surface of the housing 110 by fastening members 174 such as bolts.

A nozzle 175 is provided at a lower portion of the housing 110 so as to be fitted to the lower center of the rotor 110. The nozzle 175 rotates the oil supplied from the hollow side of the camshaft of the engine at a desired flow rate, As shown in FIG.

The upper portion of the nozzle 175 is inserted into the inner space of the rotor 110 to communicate with the inner space of the rotor.

The rotor 120 is provided with a vane mounting space 121 for receiving the vane 130. The nozzle 175 is provided to supply oil into the pump through the vane mounting space 121 .

Vane mounting grooves 122 communicating with the vane mounting space 121 are provided on both sides of the rotor 120 so that the vane 130 is inserted across the rotor 120.

A coupler 180 is connected to the lower portion of the rotor 120. The coupler 180 is connected to a cam shaft of the engine to transmit the rotational force of the cam shaft to the rotor 120 do.

The coupler 180 is an example of an external power transmitting means, but it is not limited thereto, and various power transmitting means such as gears, belts, and friction wheels are also possible. However, since the coupler 180 is widely used in the technical field, it is merely an example of the power transmission means.

The rotor 120 and the coupler 180 are not directly connected to each other but are connected to the power transmission control member 190 for selectively transmitting the rotational force transmitted through the coupler 180 to the rotor 120 Lt; / RTI >

The rotor 120 includes a body portion 123 on which the vane mounting space 121 and the vane mounting groove 122 are formed and an extension portion 125 extending downward from the body portion 123, The power transmission control member 190 is connected to the extension portion 125.

3 is a bottom perspective view of a vacuum pump according to the present invention.

Two exhaust holes 170a are provided in the lower portion of the housing 110 to discharge oil and air during the reverse rotation of the rotor 120. [ The exhaust hole on the right side in FIG. 3 is an exhaust hole used in the reverse rotation of the rotor 120.

In Fig. 3, the stopper (see Fig. 2, 173) is omitted.

The discharge hole 170a is provided in the form of a long hole, and a plate type valve 172 is disposed on the discharge hole 170a.

The valve 172 is provided with a fastening member 174 to fix the center portion of the valve 172. Both ends of the valve 172 are free ends and can cover the discharge hole 170a or open the discharge hole according to the discharge operation of the rotor 120 and the vane 130. [

In order for the valve 172 to effectively close the exhaust hole 170a, the closed area of the valve 172 should be larger than the area of the exhaust hole 170a. That is, the valve 172 should cover not only the discharge hole 170a but also the rim around the discharge hole 170a.

On the other hand, a communication passage 171 is provided beside the discharge hole 170a.

The communication passage 171 is connected to the discharge hole 170a and is formed to extend from the rim of the discharge hole 170a in the peripheral direction.

The communication channel 171 serves to communicate the inside space of the chamber 111 communicating with the discharge hole 170a and the discharge hole 170a with the outside even in a state in which the valve 172 covers the discharge hole 170a and is closed will be.

Accordingly, even when the valve 172 closes the discharge hole 170a, the external air can be introduced into the internal space of the chamber 111 communicating with the discharge hole 170a, or the fluid (oil or air) Can escape to the outside through the discharge hole (170a) and the guide passage (171).

The communication passage 171 may extend in the direction of the rotation axis of the rotor 120 from the discharge hole 170a as shown in Fig. 3 (b), or may extend from the discharge hole 170a And may extend outwardly of the housing 110.

It is needless to say that one communication passage 171 may be formed, and a plurality of communication passage 171 may be spaced apart from each other.

Since the valve 172 must continuously supply the air into the chamber 111 through the exhaust hole 170a even when the exhaust hole 170a is closed, It must be connected to the outside of the area.

That is, the length of the communication passage 171, that is, the length from the rim of the discharge hole 170a to the outer end of the communication passage 171 is longer than the distance from the rim of the discharge hole 170a to the outermost portion of the valve 172 It should be long.

The communication passage 171 can be divided into two regions and includes a first communication passage 171a which is covered by the valve 172 and is connected to a rim of the discharge hole 170a, And is further divided into a second communication passage 171b which is not covered by the valve 172.

The communication passage 171 is provided in the form of a groove or slot on the lower surface of the housing 110 to form a space between the lower surface of the valve 172 and the bottom surface of the communication passage 171, The air can be introduced into the discharge hole or the oil or air can be discharged to the outside.

Accordingly, the space in the chamber containing the fluid to be discharged, that is, the discharge fluid reservoir space 111a, always communicates with the outside by the communication passage 171 and the discharge hole 170a.

Fig. 4 is a bottom perspective view of a vacuum pump for a vehicle in which the communication passage 171 according to the present invention is not formed, and is clearly compared with the case of Fig. 3 in which the communication passage 171 is formed.

4, when the valve 172 covers the discharge hole 170a, the valve 172 covers the discharge hole 170a and the peripheral area thereof, so that the air is discharged to the discharge hole 170a The possibility of inflow or outflow of oil to the outside is blocked.

5 (a) is a partial side sectional view (BB 'cutout in FIG. 3) showing a state in which a region where the communication channel 171 is not formed is covered with a valve, and FIG. 5 (A-A 'cut in Fig. 3) showing a state in which the region including the formed region is covered with the valve 172. Fig.

Fig. 5 (c) is a modification of Fig. 5 (b), and Fig. 5 (d) is a partial cross-sectional view of the valve 172 and the communication passage 171 cut along line C-C 'in Fig. Fig. 5 (d) shows that the width of the communication passage can be recognized.

As shown in Figs. 5 (a) and 5 (b), a portion of the rim of the discharge hole 170a where the communication passage 171 is not formed is covered by the valve 172. [

The communication passage 171 extends from the rim of the discharge hole 170a and extends in one direction. The first communication passage 171a may be covered by the valve 172, but the second communication passage 171b may be closed by the valve 172 Is not covered by the valve 172 because it is located outside the area covered by the valve 172.

Since the communication passage 171 is provided in the form of a groove or a slot, the bottom surface of the valve 172 and the bottom surface of the communication passage 171 are always spaced apart to form a space.

Therefore, air introduced through the second communication passage 171b flows into the discharge hole 170a through the first communication passage 171a, and enters the discharge target fluid accommodation space 111a.

Or a fluid such as air or oil in the discharge target fluid receiving space 111a is discharged from the discharge hole 170a and the communicating hole 170a when the pressure of the space 111a exceeds a certain level even in a state where the valve 172 is closed, It can escape through the flow path 171.

As will be described later, when the volume of the discharge target fluid accommodation space 111a is sharply reduced as compared with the case where there is no communication flow path, the degree of pressure change inside the discharge target fluid accommodation space 111a is relaxed.

Thus, vibration and noise due to extreme pressure changes are reduced, thereby reducing the instability of the internal components of the vacuum pump.

5 (b), the bottom surface of the communication passage 171 may be provided in a planar shape. Alternatively, as shown in Fig. 5 (c) Or may be arranged to be inclined downward toward the side wall 170a.

5 (d), the communication passage 171 is formed on the lower surface of the housing 110 in the form of a groove or a slot, and is connected to the bottom surface of the communication passage 171 by the side wall of the communication passage 171. [ Are formed so as to be stepped with respect to the lower surface of the housing (111).

6 is a bottom perspective view showing a communication passage according to another embodiment of the present invention.

In another embodiment of the present invention, a rim 170b around the discharge hole 170a is formed to protrude, and a groove or a slot-like communication passage 171 is formed in a part of the rim 170b.

The communication hole 171 communicates with the outside of the rim portion 170b and the exhaust hole 170a inside the rim portion 170b at all times.

The valve 172 is provided so as to cover the rim portion 170b and the exhaust hole 170a.

Even when the valve 172 covers the rim portion 170b and the exhaust hole 170a, the communication hole 171 communicates with the outside of the rim portion 170b and the exhaust hole 170a at all times, A fluid such as air or oil in the chamber 111 may be discharged to the outside through the discharge hole 170a and the communication passage 171. [

7 (a) is a partial side sectional view (DD 'cutout in Fig. 6) showing a state in which a region where the communication flow path 171 is not formed is covered with a valve, and Fig. 7 Sectional view (E-E 'cut-away view in Fig. 6) showing a state in which the region including the formed region is covered by the valve 172. Fig.

7 (c) shows that the left and right widths of the communication channel 171 can be recognized (F-F 'dissection).

As shown in Figs. 7 (a) to 7 (c), a rim 170b protruding from the surface or formed in a stepped shape is formed around the discharge hole 170a.

As shown in Fig. 7 (a), the rim portion 170b in which the communication passage 171 is not formed is covered by the valve 172. However, Even though the valve 172 is on the valve 171, it can not be said that the valve 171 is covered because there is a portion communicating with the side surface.

The communication passage 171 extends from the rim of the discharge hole 170a and extends in one direction and extends to the outermost portion of the rim portion 170b and communicates with the outer rim space of the rim portion 170b.

As a result, the air introduced through the communication passage 171 flows into the discharge hole 170a and enters the discharge target fluid accommodation space 111a.

According to the other embodiments of Figs. 6 to 7, when the volume of the discharge target fluid accommodation space 111a is sharply reduced as compared with the case where there is no communication flow passage, the degree of pressure change inside the discharge target fluid accommodation space 111a is relaxed.

As shown in Fig. 7 (c), the communication passage 171 is provided in a form in which a part of the rim portion 170b is cut in a groove or slot shape.

8 shows that the rotor 120 and the vane 130 rotate clockwise when viewed from above.

As shown in FIG. 8 (a), the discharge target fluid accommodation space 111a defined by the vane 130 and the inner wall of the housing 110 is filled with the air introduced by the oil and the communication passage 171 .

In this state, the valve 172 is closed.

Here, the thick arrow indicates the position of the vane 130.

8 (b), when the rotor 120 further rotates counterclockwise and the vane 130 reaches the discharge hole 170a, oil and air move to the discharge hole 170a, By this, the valve 172 is opened and the discharge hole 170a is completely opened.

Since the discharge hole 170a is provided in the shape of a slot rather than a circular shape, the vane 130 moves along the longitudinal direction of the discharge hole 170a during the minute time interval to perform the discharge action.

FIGS. 9 and 10 show pressure changes in the chamber interior, that is, the fluid receiving space to be discharged, measured at a specific point according to the present invention and the related art. Where one cycle of vacuum pumping by rotation of the rotor and vane was repeated twice.

Here, the measurement point is near the point where the discharge hole ends in FIG.

9, the internal pressure of the discharge target fluid accommodation space 111a is maintained in a vacuum state (about -1000 mbar) (①), and the rotor 120 is rotated to rotate the vane 130 When the volume of the discharge target fluid accommodation space 111a is significantly reduced, the internal pressure starts to rise sharply (②).

Even in this state, the valve 172 is not yet opened.

This is because the distribution density of the oil rapidly increases in the state in which the discharge target fluid space 170a is remarkably narrowed.

Immediately before the valve 172 is opened, the internal pressure peaks (③), and when the valve 172 is opened, the oil drops off rapidly (④).

In the next cycle, the process described above is repeated. The internal components are influenced by the preceding vibration, so that the peak value of the pressure can be formed larger than the peak value of the previous cycle.

Thus, in the case of the prior art, a graph of the change in pressure forms an impulse graph. When the physical system is impulse-loaded, it provides a cause for the physical system to become unstable because the large load is temporarily concentrated.

On the other hand, in the case of the present invention, since the air is supplied to the discharge target fluid space 111a, the pressure of the discharge target fluid space 111a gradually increases (1 '). The pressure of the discharge target fluid space 111a is peaked in a state immediately before the vane 120 is positioned near the starting point of the discharge hole 130 but the valve 172 is opened.

However, the height of the peak point of the present invention is low in comparison with the prior art. This is because a part of the fluid (oil + air) in the discharge target fluid accommodation space 111a is discharged to the discharge hole (170a) and the guide passage (171).

Then, while the valve 172 starts to be opened and the vane 130 moves along the longitudinal direction of the discharge hole 170a, the pressure is slightly lowered. The pressure again rises immediately before the end of the discharge hole 170a (③ ').

When the vane 130 passes the end point of the discharge hole 170a, the discharge fluid accommodation space is destroyed, and the pressure returns to the vacuum state (④ ').

The overall pressure change of the prior art shown in FIG. 9 and the present invention are shown in FIG.

10 (a) shows the pressure change in the cyclic state of several times in the prior art, the impulse type pressure change is shown, and the height of the peak point is also different.

Also, since the pressure at the peak point is very high and the formation time is short, the mechanical part or the shock applied to the vacuum pump is very large.

However, as shown in FIG. 10 (b), in the case of the present invention, the pressure change curve is spread to the side rather than the conventional one, and the peak curve of the conventional type does not appear.

In addition, because the outside air is introduced through the guide passage 171 or a part of the fluid in the accommodation space 111a of the discharge target fluid escapes before the valve 172 is opened, the peak point is formed as in the prior art Is prevented.

In addition, since the magnitude of the peak point appears almost uniformly in all cycles, the impact load on the vacuum pump is reduced as compared with the prior art, and stable operation is possible.

Those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it is to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

120: rotor 130: vane
170a: discharge hole 170b: rim portion
171: communication channel 172: valve

Claims

A housing in which a chamber is formed;
A discharge hole provided in the housing and communicating with the chamber;
A valve disposed on the outer surface of the housing for selectively opening and closing the discharge hole;
And a communication channel provided on an outer surface of the housing and communicating with the exhaust hole to allow the chamber to communicate with the outside through the exhaust hole even when the exhaust hole is closed by the valve,
Wherein the communication passage includes:
A first communication flow path extending from a rim of the discharge hole and extending to the discharge hole side; And a second communication passage extending from the first communication passage to a region over the region covered by the valve and being exposed to the outside.

The method according to claim 1,
Wherein the communication passage is formed in a shape having a predetermined depth from a rim of the discharge hole,
And the outermost end of the communication passage is disposed so as to extend beyond a region covered by the valve.

delete

The method according to claim 1,
Wherein a distance from the exhaust hole rim to the outermost end of the communication passage is longer than a distance from the exhaust hole rim to the valve side end portion.

The method according to claim 1,
Wherein the communication passage is formed to extend in the direction of the rotation axis of the rotor or extend in the outward direction.

The method according to claim 1,
Characterized in that the bottom surface of the communication passage is formed in a plane and is provided in a groove shape formed to be stepped as compared with the surface of the housing.

The method according to claim 1,
Wherein the bottom surface of the communication passage is inclined downward in the direction of the exhaust hole and is provided in a groove shape formed to be stepped as compared with the surface of the housing.

A housing in which a chamber is formed;
A discharge hole provided in the housing and communicating with the chamber;
A valve disposed on the outer surface of the housing for selectively opening and closing the discharge hole;
And a communication channel provided on an outer surface of the housing and communicating with the exhaust hole to allow the chamber to communicate with the outside through the exhaust hole even when the exhaust hole is closed by the valve,
A rim of the discharge hole is provided so as to protrude from an outer surface of the housing and is formed to be stepped,
Wherein the communication passage is formed such that a part of the rim portion is cut so that the exhaust hole always communicates with the outer space of the rim portion.