JPH1182291A - Pumping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent metal powder from being generated at the time of assembly, and to prevent failure caused by such foreign matter. SOLUTION: An accommodation hole 2 is penetrated through a housing 1, and a bottomed tubular cylinder 10 is inserted and fixed inside the accommodating hole 2. A plunger 12 is slidably accommodated in the cylindrical inner part 11 of the cylinder 10, and a pump room 14 is formed on the bottom part 13 side of the cylinder 10. The plunger 12 is driven so as to reciprocate by a driving cam 6 for a pump action. At the bottom part of the cylinder 10, a delivery room 21 is formed, which communicates with the pump room 14 through a delivery hole 20, and a delivery valve 28 for opening and closing the delivery hole 20 is formed in the delivery room 21. The delivery hole 20 is formed directly at the bottom part 13 of the cylinder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a good pump device applied to an anti-lock brake device for controlling a brake fluid pressure of a vehicle.

[0002]

2. Description of the Related Art As this type of pump device, for example, Japanese Patent Application Laid-Open No. Hei 8-240274 discloses a pump having a housing hole formed through a housing, a bottomed cylindrical cylinder inserted into the housing hole. A plunger which is slidably housed inside the cylinder of the cylinder, forms a pump chamber on the bottom side of the cylinder, and is reciprocally driven by a drive cam to perform a pumping operation; A pump device including a discharge chamber communicating with a pump chamber through a hole, and a discharge valve provided in the discharge chamber to open and close the discharge hole is shown. The discharge hole is formed in a ring member that is press-fitted and fixed to the bottom of the cylinder.

[0003]

However, in the conventional pump device, the ring member having the discharge hole is fixed to the bottom of the cylinder by press-fitting. For this reason, the number of parts increases, and when metal powder is generated at the time of press-fitting of the ring member, the metal powder may remain inside the pump device as a foreign substance, causing a malfunction in the operation of the pump device.

The present invention has been devised in view of such a conventional situation, and provides a pump device which does not generate metal powder at the time of assembling and which can prevent a problem caused by the foreign matter. The purpose is to:

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a receiving hole formed through a housing, a bottomed cylindrical cylinder inserted and fixed in the receiving hole, and a cylinder having a bottom. A plunger which is slidably housed in the inside of the cylinder, forms a pump chamber on the bottom side of the cylinder, and is reciprocally driven by a drive cam to perform a pump action, and is formed on the bottom of the cylinder through a discharge hole. A discharge chamber communicating with the pump chamber and a discharge valve provided in the discharge chamber for opening and closing the discharge hole, wherein the discharge hole is formed directly at the bottom of the cylinder.

According to a second aspect of the present invention, there is provided an accommodating hole formed through the housing, a plug member inserted and fixed in the accommodating hole, and slidably accommodated in the accommodating hole. A pump chamber is formed between the plug member and
A plunger reciprocally driven by the drive cam to perform a pumping operation, a discharge chamber formed in the plug member and communicating with the pump chamber through a discharge hole, and a discharge valve provided in the discharge chamber for opening and closing the discharge hole. And the discharge hole is formed directly in the plug member.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the discharge chamber is open to the opening end side of the accommodation hole. Are sealed by a sealing member.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the sealing member is fixed to the opening end of the discharge chamber by caulking. .

According to a fifth aspect of the present invention, in the configuration of the first or second aspect of the invention, the sealing member is formed by a plate member fixed to an opening end of the receiving hole. It is configured to be fixed to the open end.

According to a sixth aspect of the present invention, in the configuration of the first or second aspect, the sealing member is fixed to the opening end of the discharge chamber by welding. .

In such a configuration, the plunger is reciprocally driven by the drive cam to perform a pump action. That is, when the plunger is reciprocated, the hydraulic fluid is sucked into the pump chamber, and is discharged from the pump chamber to the discharge chamber via the discharge hole and the discharge valve attached to the discharge hole.

Here, in the first aspect of the present invention, the discharge hole and the discharge chamber are formed directly at the bottom of the cylinder forming the pump chamber. Further, in the invention according to claim 2, it is formed directly on the plug member forming the pump chamber.

Therefore, no special parts are required for forming the discharge holes and the discharge chambers, and it is not necessary to fix these parts by press-fitting or swaging.

Therefore, there is provided a pump device which does not generate metal powder at the time of assembling and which can prevent a problem caused by the foreign matter.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described as a pump device applied to an anti-lock brake device.
This will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a pump device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a housing, and a housing hole 2 is formed through the housing 1.
The receiving hole 2 has a small diameter portion 3 and a large diameter portion 4 at both ends in the axial direction.
And a middle diameter portion 5 at the center portion, and a small diameter portion 3
Is opened in a central hole 7 in which a drive cam 6 rotated by a drive shaft (not shown) is accommodated, and the large diameter portion 4 is opened to the outside.
Further, a suction passage 8 communicating with a reservoir (not shown) and a discharge passage 9 communicating with a master cylinder (not shown) are opened in the accommodation hole 2. Specifically, the suction passage 8 opens to the middle diameter portion 5, and the discharge passage 9 opens to the large diameter portion 4.

Reference numeral 10 denotes a bottomed cylindrical cylinder which is inserted and fixed in the accommodation hole 2. A plunger 12 is slidably accommodated in a cylindrical interior 11 of the cylinder. A chamber 14 is formed.

More specifically, the small-diameter cylindrical portion 15 of the cylinder 10 inserted and fixed in the accommodation hole 2 has a small-diameter body portion 15 of the cylinder 10 inserted into the small-diameter portion 3 of the accommodation hole 2, and a medium-diameter body portion 16. The large-diameter trunk 17 is inserted into the middle-diameter part 5, the large-diameter trunk 17 is inserted into the large-diameter part 4, and a flange 18 formed on the outer periphery of the large-diameter trunk 17.
Is fixed to the opening end of the accommodation hole 2 by a caulking 19, thereby being fixed in the accommodation hole 2.

At the bottom 13 of the cylinder 10, there are formed a discharge hole 20 opening to the pump chamber 14 and a discharge chamber 21 communicating with the pump chamber 14 via the discharge hole 20.
The discharge chamber 21 is opened on the opening end side of the housing hole 2 for convenience of forming the discharge chamber 21 and the discharge hole 20 on the bottom portion 13 of the cylinder 10, and the opening end of the discharge chamber 21 is spherically sealed. It is sealed by the stop member 22. The sealing member 22 is fixed by swaging 23.

Further, a through hole 24 is formed in the bottom portion 13 of the cylinder 10 so as to cross the discharge chamber 21, and the discharge chamber 21 is formed by the through hole 24.
Through the inside of the large-diameter portion 4 of the accommodation hole 2 formed in the above-mentioned, it communicates with the discharge passage 9.

The discharge chamber 21 accommodates a discharge valve 28 in which the ball valve 25 is biased by a check spring 26 and adapted to the valve seat 27 of the discharge hole 20. In this case, the sealing member 22 also serves as a spring receiver for the check spring 26.

The small-diameter body portion 15 of the cylinder 10 faces a suction passage 8 formed in the housing 1 and has a diametrical through-hole 2 communicating with a cylindrical interior 11 of the cylinder 10.
9 are formed.

A compression spring 30 having one end in contact with the plunger 12 and the other end in contact with the bottom 13 of the cylinder 10 is accommodated in a pump chamber 14 formed on the bottom 13 side of the cylinder 10. Plunger 1 by
2 is pressed by the drive cam 6.

The plunger 12 has a circumferential groove 31 facing a through hole 29 formed in the small diameter body portion 15 of the cylinder 10.
And a diametrical through hole 3 opening at the bottom of the peripheral groove 31.
2 and an axial blind hole 33 communicating with the through hole 32 and opening toward the pump chamber 14 is formed. At the open end of the blind hole 33, there is provided a suction valve 37 which is adapted to be deflected by a check spring 35 and adapted to a valve seat 36 of the blind hole 33. Reference numeral 38 denotes a seal ring provided on the outer periphery of the plunger 12 closer to the center hole 7 of the housing 1 than the peripheral groove 31.

Reference numeral 39 denotes a seal ring provided on the outer periphery of the small-diameter body 15 of the cylinder 10, and 40 denotes a large-diameter body 17 similarly.
Is a seal ring provided on the outer periphery of the.

The drive cam 6 is provided eccentrically from the rotation axis of the drive shaft (not shown). Further, in this embodiment, the pump device is disposed on both sides of the central hole 7 so as to face each other.

In such a configuration, the drive cam 6 is rotated by a motor or the like via a drive shaft, and the plunger 12 is reciprocated by the drive cam 6 to act as a pump.

That is, the plunger 12 is connected to the pump chamber 14
By moving the cylindrical interior 11 of the cylinder 10 in the direction of the center hole 7 by the spring force of the inner compression spring 30, the inside of the pump chamber 14 becomes a negative pressure. As a result, the hydraulic fluid in the reservoir (not shown) is guided from the suction passage 8 into the middle diameter portion 5 of the housing hole 2, and further, the through hole 29 of the cylinder 10, the plunger 1
2 through the circumferential groove 31, the through hole 32, the blind hole 33, and the suction valve 3
7 is opened to be sucked into the pump chamber 14. At this time, the discharge valve 28 closes the discharge hole 20 by the ball valve 25 being urged by the spring force of the check spring 26 to be seated on the valve seat 27 of the discharge hole 20.

When the plunger 12 is moved by the driving cam 6 toward the pump chamber 14 against the spring force of the compression spring 30, the ball valve 34 of the suction valve 37 is closed by the spring force of the check spring 35. After sitting on the valve seat 36, the suction valve 37 closes to prevent the hydraulic fluid in the pump chamber 14 from flowing into the blind hole 33, so that the pressure in the pump chamber 14 becomes high. Thereby, the pump chamber 14
The working fluid in the inside opens the discharge valve 28 from the discharge hole 20 and is discharged into the discharge chamber 21, and is further guided from the discharge chamber 21 into the large diameter portion 4 of the housing 1 through the through hole 24.
It is discharged from the discharge passage 9 to the master cylinder side (not shown).

As a result, the pump device pumps the working fluid flowing into the reservoir from a wheel cylinder (not shown) to the master cylinder side.

Here, in such a configuration, the discharge hole 20 and the discharge chamber 21 are formed directly on the bottom 13 of the cylinder 10 forming the pump chamber 14.

Therefore, the discharge hole 20 and the discharge chamber 21
No special parts are required to form the slab, and no work is required to fix these parts by press-fitting or swaging. Although the sealing member 22 of the discharge chamber 21 is fixed by a caulking 23, the caulking 23
Is applied to the outside of the discharge chamber 21, and even if metal powder is generated at the time of caulking and fixing the sealing member 22, foreign matter does not enter the inside of the pump device.

Therefore, a pump device which does not generate metal powder at the time of assembling and which can prevent a problem caused by the foreign matter beforehand can be obtained.

FIGS. 2 to 4 show another embodiment of the present invention. These embodiments are different from the above embodiments in the following points.

That is, the embodiment shown in FIG. 2 is different from the embodiment shown in FIG.
Is fixed to the opening end of the accommodation hole 2 by the caulking 19 via the plate member 41. In this case, the plate member 41 secures the spherical sealing member 22 so as to prevent the spherical sealing member 22 from slipping out. For this reason, the caulking 23 employed in the embodiment is eliminated.

The embodiment shown in FIG.
Is sealed with a sealing member 42 made of a thin plate member formed in a hat shape. The sealing member 42 is welded,
Preferably, it is fixed by laser beam welding, spot welding or the like. In this case, the sealing member 42 is not limited to a hat shape, but may be a flat plate shape as shown in FIG.
As shown in FIG. 4 (b), an annular rib 21a may be provided at the opening end of the discharge chamber 21 to form a bottomed cylinder having a body that fits the rib 21a.

Since other structures are substantially the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

With this configuration, the same operation and effect as those of the above embodiment can be obtained.

FIG. 5 is a drawing showing another embodiment of the present invention. This embodiment is different from the above-described embodiment in that the plunger 12 and the plug member 45 are inserted into the receiving hole 2 formed in the housing 1 and the pump chamber 14 is formed between the plunger 12 and the plug member 45. The plug member 45 is formed and the discharge hole 20 and the discharge chamber 2 are formed in the plug member 45.
1 is directly formed.

That is, in the embodiment shown in FIG. 5, the housing hole 2 formed in the housing 1 has a small-diameter portion 3, a medium-diameter portion 4, and a large-diameter portion 5; This is the same as the embodiment, but the formation position of the suction passage 8 is different. That is, the suction passage 8 is open to the small-diameter portion 3, and a circumferential groove 3 a is formed on the inner periphery of the small-diameter portion 3 where the suction passage 8 opens.
Is formed.

A plug member 45 is inserted and fixed in the accommodation hole 2. More specifically, the plug member 45 is configured such that the small-diameter body portion 46 of the plug member 45
And the large-diameter trunk portion 47 is inserted into the large-diameter portion 4, and a flange 48 formed on the outer periphery of the large-diameter trunk portion 47 is fixed to the opening end of the accommodation hole 2 by swaging 19, whereby the accommodation hole is formed. It is fixed in 2.

The plug member 45 has a discharge hole 20 opening to the pump chamber 14 and a discharge chamber 21 communicating with the pump chamber 14 through the discharge hole 20. The discharge chamber 21 is defined by the cylinder 1 and the discharge chamber 21 and the discharge hole 20.
For convenience of formation at the bottom 13 of the nozzle hole 0, it is open at the opening end side of the housing hole 2, and the opening end of the discharge chamber 21 is sealed by a spherical sealing member 22. The sealing member 22 is fixed by swaging 23.

The plug member 45 includes the discharge chamber 21.
Is formed, and the discharge chamber 21 communicates with the discharge passage 9 via the inside of the large-diameter portion 4 of the housing hole 2 formed in the housing 1 by the through hole 24. ing.

The discharge chamber 21 accommodates a discharge valve 28 in which the ball valve 25 is biased by a check spring 26 so as to be adapted to the valve seat 27 of the discharge hole 20. In this case, the sealing member 22 also serves as a spring receiver for the check spring 26.

A compression spring 30 having one end in contact with the plunger 12 and the other end in contact with the plug member 45 is accommodated in the pump chamber 14 formed in the accommodation hole 2 between the plunger 12 and the plug member 45. The plunger 12 is pressed against the drive cam 6 by the compression spring 30.

The plunger 12 has a small diameter portion 3 of the accommodation hole 2.
The plunger 12 has a diametrical through hole 49 opened in the circumferential groove 3 a of the small diameter portion 3 and an axial blind hole communicating with the through hole 49 and opening toward the pump chamber 14. 50 are formed. At the open end of the blind hole 50, there is provided a suction valve 37 which is adapted to bias the ball valve 34 with a check spring 35 so as to fit the valve seat 36 of the blind hole 50.

Since other structures are substantially the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

Even in such a configuration, the plunger 12 is reciprocally driven by the rotation of the drive cam 6,
The same pumping action as in the above embodiment is performed. In addition, since the discharge hole 20 and the discharge chamber 21 are formed directly on the plug member 45 forming the pump chamber 14, no special parts are required to form the discharge hole 20 and the discharge chamber 21. No work is required to fix the parts by press fitting or swaging. Although the sealing member 22 of the discharge chamber 21 is fixed by the caulking 23, the caulking 23 is performed outside the discharge chamber 21.
Even if metal powder is generated when the sealing member 22 is fixed by caulking, foreign matter does not enter the inside of the pump device.

Therefore, a pump device can be obtained which does not generate metal powder at the time of assembling and which can prevent problems caused by the foreign matter.

FIGS. 6 and 7 show another embodiment of the present invention. These embodiments differ from the embodiment shown in FIG. 5 in the following point.

That is, the embodiment shown in FIG. 6 is different from the embodiment shown in FIG.
This is a point that when the caulk 8 is fixed to the opening end of the accommodation hole 2 by the caulking 19, it is fixed via the plate member 41. In this case, the plate member 41 secures the spherical sealing member 22 so that the spherical sealing member 22 cannot be removed. For this reason, the caulking 23 employed in the embodiment shown in FIG. 5 is eliminated.

The embodiment shown in FIG.
Is sealed with a sealing member 42 made of a thin plate member formed in a hat shape. The sealing member 42 is welded,
Preferably, it is fixed by laser beam welding, spot welding or the like. Note that the sealing member 42 is not limited to a hat shape, but may be a flat plate shape as shown in FIG.
As shown in (b), an annular rib 2 is provided at the open end of the discharge chamber 21.
It is also possible to provide a bottom 1a and provide a bottomed cylindrical shape having a body that fits into the rib 21a.

Since other configurations are substantially the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

With this configuration, the same operation and effect as those of the above embodiment can be obtained.

The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to this, and can be changed without departing from the gist of the invention. For example, as the suction valve 37 and the discharge valve 28, the ball valve 3
Although the embodiments using 4, 25 have been described, the present invention is not limited to this, and valves having various structures such as using a plate valve can be adopted.

The embodiment in which the suction valve 37 is disposed in the pump chamber 14 has been described. However, the suction valve 37 may be attached to the suction passage 8, or the suction valve 37 may be omitted, and the body of the plunger 12 may be removed. The opening and closing of the suction passage 8 may be configured as follows.

[0057]

As described above in detail, according to the present invention, there is provided a pump device which does not generate metal powder at the time of assembling and which can prevent a problem caused by this foreign matter.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a pump device showing another embodiment of the present invention.

FIG. 3 is a sectional view of a pump device showing another embodiment of the present invention.

FIG. 4 is a drawing showing another embodiment of the sealing member with a flat sealing member (a) and a bottomed cylindrical sealing member (b).

FIG. 5 is a cross-sectional view of a pump device showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a pump device showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a pump device showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Housing hole 6 Drive cam 10 Cylinder 11 Cylindrical interior 12 Plunger 13 Bottom part 14 Pump chamber 20 Discharge hole 21 Discharge chamber 28 Discharge valve

Claims (6)

[Claims] An accommodation hole formed through a housing, a bottomed cylindrical cylinder inserted and fixed in the accommodation hole, and a slidably accommodated cylinder inside the cylinder. A plunger that forms a pump chamber on the bottom side and is reciprocally driven by a driving cam to perform a pumping operation, a discharge chamber formed at the bottom of the cylinder and communicates with the pump chamber through a discharge hole, Provided,
A pump device, comprising: a discharge valve that opens and closes a discharge hole, wherein the discharge hole is formed directly on a bottom of a cylinder. 2. A pump chamber between a housing hole formed through the housing, a plug member inserted and fixed in the housing hole, and a slidable housing in the housing hole. And a plunger reciprocally driven by a driving cam to perform a pumping operation; a discharge chamber formed in the plug member and communicating with the pump chamber through a discharge hole; and a discharge hole provided in the discharge chamber. A discharge valve that opens and closes, wherein the discharge hole is formed directly in the plug member. 3. The discharge chamber according to claim 1, wherein the discharge chamber is open at an opening end of the accommodation hole, and the opening end of the discharge chamber is sealed by a sealing member. A pump device as described. 4. The apparatus according to claim 3, wherein the sealing member is fixed to an opening end of the discharge chamber by caulking.
A pump device as described. 5. The pump device according to claim 3, wherein the sealing member is fixed to an opening end of the discharge chamber by a plate member fixed to an opening end of the accommodation hole. 6. The pump device according to claim 3, wherein the sealing member is fixed to an opening end of the discharge chamber by welding.