JPH1182320A - Pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device capable of previously preventing a trouble from occurring in liquid tight sealing at the opening end of a storing hole. SOLUTION: A storing hole 2 to which a suction path 8 and a delivery path 9 for working liquid are open is formed in a housing 1. A sealing member 17A is inserted into the storing hole 2 so as to seal the opening end of the storing hole 2. Also, a bottomed cylindrical cylinder 10 is inserted into the storing hole 2 so as to partition the inside of the storing hole 2, at a division drum part 16, into a low pressure side 2a to which the suction path 8 is opened and a high pressure side 2b to which the delivery path 9 is opened. In addition, a plunger 12 is stored slidably in the cylindrical inner part 11 of the cylinder 10 so as to form a pump chamber 14 on the bottom part 13 side of the cylinder 10. The plunger 12 is reciprocated driven by a drive cam 6 so as to enable pumping operation. Then the inner diameter of the storing hole 2 is set so that the inner diameter of a part into which the sealing member 17 is inserted is made larger than the inner diameter of a part into which the division drum part 16 of the cylinder is inserted.

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 kind of pump device, for example, Japanese Patent Application Laid-Open No. 6-298062 discloses a housing hole formed through a housing and opening a suction passage and a discharge passage of a working liquid, as shown in FIG. A sealing member that is inserted and fixed in the accommodation hole and seals an opening end of the accommodation hole; and a high-pressure side that is also inserted and fixed in the accommodation hole and communicates with the suction passage and the discharge passage inside the accommodation hole. A cylinder having a bottomed cylinder having a section body sectioned on the side, and slidably housed inside the cylinder of the cylinder, forming a pump chamber on the bottom side of the cylinder, and reciprocally driven by a drive cam. There is disclosed a pump device including a plunger that performs a pumping operation. The pump device sucks working liquid from a suction passage into a pump chamber by a pumping operation of the plunger, and discharges the discharge passage from the pump chamber. To discharge.

[0003]

However, in the prior art, the inner diameter of the receiving hole is determined by the inner diameter of the portion where the sealing member for sealing the opening end of the receiving hole is inserted and the inner diameter of the cylinder. The inside diameter of the portion into which the body is inserted is formed to have the same dimensions. For this reason, on account of assembly, the partition body of the cylinder inserted before the insertion of the sealing member,
The inner peripheral surface of the housing hole is easily damaged, and there is a possibility that a problem may occur in the liquid-tight sealing of the opening end of the housing hole by the sealing member.

The present invention has been devised in view of such a conventional situation, and provides a pump device capable of preventing a problem in liquid-tight sealing of an opening end of a housing hole. With the goal.

[0005]

SUMMARY OF THE INVENTION In view of the above, according to the present invention, there is provided a housing hole formed through a housing and opening a suction passage and a discharge passage of a working liquid, and inserted and fixed in the housing hole. A sealing member that seals an opening end of the accommodation hole, and a partition body that is also inserted and fixed in the accommodation hole and divides the interior of the accommodation hole into a low-pressure side where the suction passage is opened and a high-pressure side where the discharge passage is opened. And a plunger that 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 pump action. Prepared,
The accommodation hole is formed with a plurality of inner diameters,
The inner diameter of the portion where the sealing member is inserted is formed larger than the inner diameter of the portion where the partition body of the cylinder is inserted.

According to a second aspect of the present invention, there is provided a housing hole formed through the housing to open the suction passage and the discharge passage for the working liquid, and inserted and fixed in the housing hole, and the opening end of the housing hole. A bottomed cylindrical cylinder having a sealing bottom portion for sealing the inside of the housing hole, a partition body portion for partitioning the inside of the accommodation hole into a low-pressure side where the suction passage opens and a high-pressure side where the discharge passage opens, and the cylindrical shape of this cylinder A plunger that is slidably housed therein, forms a pump chamber on the bottom side of the cylinder, and is reciprocally driven by a driving cam to perform a pumping operation. The housing hole is formed with a plurality of inner diameters. The inner diameter of the portion where the sealing bottom is inserted is formed to be larger than the inner diameter of the portion where the partition body of the cylinder is inserted.

According to a third aspect of the present invention, there is provided a receiving hole formed through the housing to open the suction passage and the discharge passage of the working liquid, and inserted and fixed in the receiving hole, and the opening end of the receiving hole. A plug member having a sealing bottom portion that seals the inside of the housing hole, a partition body that partitions the inside of the housing hole into a low-pressure side where the suction passage opens, and a high-pressure side where the discharge passage opens, and slidably slides into the housing hole. A plunger that is housed and forms a pump chamber with the plug member, and is reciprocally driven by a driving cam to perform a pumping operation. The housing hole is formed with a plurality of inner diameters, and the plug member is sealed. The inner diameter of the portion where the stop bottom is inserted is formed to be larger than the inner diameter of the portion where the partition body is inserted.

According to a fourth aspect of the present invention, in the configuration of the first aspect, a seal member is provided between an outer periphery of the sealing member and an inner periphery of the housing hole. It is.

According to a fifth aspect of the present invention, in the configuration of the second aspect, a seal member is provided between an outer periphery of the sealing bottom of the cylinder and an inner periphery of the housing hole. Configuration.

According to a sixth aspect of the present invention, in the configuration of the third aspect, a seal member is provided between an outer periphery of the sealing bottom of the plug member and an inner periphery of the housing hole. Configuration.

In such a configuration, the plunger is reciprocally driven by the drive cam to perform a pump action. That is, as the plunger is reciprocated, the working liquid is sucked into the pump chamber from the suction passage, and is discharged from the pump chamber to the discharge passage.

Here, in the invention according to claim 1,
The cylinder is inserted into the accommodation hole, and the partition body of the cylinder partitions the interior of the accommodation hole into a low-pressure side where the suction passage opens and a high-pressure side where the discharge passage opens, while the sealing member accommodates the same. It is inserted into the hole to seal the opening end of the receiving hole, and at this time, the inner diameter of the receiving hole is such that the inner diameter of the portion into which the sealing member is inserted is the insertion of the partition body of the cylinder. It is formed larger than the inner diameter of the portion.

For this reason, even if the partition body of the cylinder is inserted before the sealing member is inserted, the inner peripheral surface of the receiving hole in the portion where the sealing member is inserted is not damaged, and the sealing member is not damaged. This prevents a problem in the liquid-tight sealing of the opening end of the housing hole due to the above.

According to the second aspect of the present invention, the cylinder is inserted into the accommodation hole, and the partition body has a low pressure side where the suction passage opens in the accommodation hole and a high pressure side where the discharge passage opens. Side, while the sealing bottom seals the opening end of the housing hole. At this time, the inside diameter of the housing hole is such that the inside diameter of the portion into which the sealing bottom of the cylinder is inserted is defined by the section of the cylinder. It is formed larger than the inner diameter of the part where the body is inserted.

For this reason, even when the partition body of the cylinder is inserted, the inner peripheral surface of the accommodation hole where the sealing bottom is inserted is not damaged, and the liquid at the opening end of the accommodation hole by the sealing bottom is not damaged. This prevents a problem from occurring in hermetic sealing.

According to the third aspect of the present invention, the plug member is inserted into the housing hole, and the partition body portion opens to the low pressure side where the suction passage opens in the housing hole and the discharge passage. On the other hand, the sealing bottom portion seals the opening end of the housing hole, and the inside diameter of the housing hole is such that the inside diameter of the portion where the sealing bottom portion of the plug member is inserted is equal to that of the plug. It is formed larger than the inner diameter of the portion where the partition body of the member is inserted.

For this reason, even when the partition body of the plug member is inserted, the inner peripheral surface of the accommodation hole where the sealing bottom is inserted is not damaged, and the opening end of the accommodation hole formed by the sealing bottom is not damaged. This prevents problems in liquid-tight sealing.

Therefore, a pump device can be obtained which can prevent a problem in liquid-tight sealing of the opening end of the housing hole.

Further, according to the present invention, liquid-tight sealing of the opening end of the housing hole can be performed more reliably.

[0020]

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 showing 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, and a pump 13 is provided on the bottom 13 side of the cylinder 10. A chamber 14 is formed.

The bottomed cylindrical cylinder 10 inserted and fixed in the accommodation hole 2 has a small-diameter body portion 15 and an intermediate-diameter body portion 16, and the small-diameter body portion 15 is fitted to the small-diameter portion 3 of the accommodation hole 2. The medium-diameter trunk portion 16 is inserted into the medium-diameter portion 5, thereby dividing the large-diameter portion 4 and the medium-diameter portion 5 in the accommodation hole 2. In other words, the medium-diameter body portion 16 of the cylinder 10 serves as a partition body portion, so that the inside of the accommodation hole 2 has a low-pressure side 2a where the suction passage 8 opens and a high-pressure side 2b where the discharge passage 9 opens.
It is divided into and.

Reference numeral 17A denotes a sealing member which is inserted and fixed in the large-diameter portion 4 of the accommodation hole 2 and seals the open end of the accommodation hole 2.
The sealing member 17A is fixed in the accommodation hole 2 by fixing a flange 18 formed on the outer periphery to the opening end of the accommodation hole 2 by caulking 19, and is fixed in the large diameter portion 4 of the accommodation hole 2. A discharge chamber 20 in which the discharge passage 9 opens is formed between the discharge chamber 20 and the bottom of the cylinder 10. Further, a depression 21 is formed in the sealing member 17A, whereby the volume of the discharge chamber 20 is substantially increased.

A plug member 23 having a discharge hole 22 is provided at the bottom portion 13 of the cylinder 10, and the discharge hole 22 of the plug member 23 connects the pump chamber 14 and the discharge chamber 20. .

In the discharge chamber 20, 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 22 is accommodated. The check spring 26 is supported by the bottom of a cup-shaped retainer 29 fixed to the plug member 23. The retainer 29 has an opening 29a penetrating in and out.

The small-diameter body portion 15 of the cylinder 10 has a diametric through-hole 3 facing the suction passage 8 formed in the housing 1 and communicating with the cylindrical interior 11 of the cylinder 10.
0 is formed.

A compression spring 31 having one end in contact with the plunger 12 and the other end in contact with the plug member 23 provided on the bottom 13 of the cylinder 10 is accommodated in a pump chamber 14 formed on the bottom 13 side of the cylinder 10. The plunger 12 is pressed against the drive cam 6 by the compression spring 31.

The plunger 12 has a circumferential groove 32 facing the through hole 30 formed in the small diameter body portion 15 of the cylinder 10.
And a diametrical through hole 3 opening at the bottom of the circumferential groove 32.
3, and an axial blind hole 34 communicating with the through hole 33 and opening toward the pump chamber 14 is formed. At the open end of the blind hole 34, there is provided a suction valve 38 which is adapted to deflect the ball valve 35 with a check spring 36 so as to fit a valve seat 37 of the blind hole 34. Reference numeral 39 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 32.

Reference numeral 40 denotes a seal ring provided on the outer periphery of the small diameter body portion 15 of the cylinder 10, and 41 denotes a seal ring provided on the outer periphery of the sealing member 17A.

The drive cam 6 is provided eccentrically from the rotational 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 (not shown) via a drive shaft, and the plunger 12 is reciprocated by the drive cam 6 to perform a pump action.

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 compression spring 31 inside, the inside of the pump chamber 14 becomes a negative pressure. Thereby, the hydraulic fluid in the reservoir (not shown) is guided from the suction passage 8 into the middle diameter portion 5 of the accommodation hole 2, and further, the through hole 30 of the cylinder 10, the plunger 1
2 through the circumferential groove 32, the through hole 33, the blind hole 34, and the suction valve 3
8 is opened to be sucked into the pump chamber 14. At this time, the discharge valve 28 closes the discharge hole 22 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 22.

When the plunger 12 is moved by the driving cam 6 toward the pump chamber 14 against the spring force of the compression spring 31, the ball valve 35 of the suction valve 38 is turned into the blind hole 34 by the spring force of the check spring 36. After sitting on the valve seat 37, the suction valve 38 is closed to prevent the hydraulic fluid in the pump chamber 14 from flowing into the blind hole 34, 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 22 and is discharged into the discharge chamber 20, and is further discharged from the discharge chamber 20 to the master cylinder side (not shown) through the discharge passage 9.

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

Here, in the above configuration, the cylinder 10 is inserted into the housing hole 2 and the partition body (medium diameter body) 16 of the cylinder 10 passes through the housing hole 2 through the suction passage 8. Is divided into a low-pressure side 2a where the opening is opened and a high-pressure side 2b where the discharge passage 9 is opened, while the sealing member 17A is inserted into the accommodation hole 2 to seal the opening end of the accommodation hole 2. At this time, the inner diameter of the housing hole 2 is such that the inner diameter of the portion (large-diameter portion 4) into which the sealing member 17A is inserted is larger than the inner diameter of the portion (medium-diameter portion 5) of the cylinder 10 into which the partition body 16 is inserted. Are also large.

Therefore, even if the partition body 16 of the cylinder 10 is inserted before the sealing member 17A is inserted, the inner peripheral surface of the receiving hole 2 where the sealing member 17A is inserted may be damaged. In addition, it is possible to prevent a problem from occurring in the liquid-tight sealing of the opening end of the housing hole 2 by the sealing member 17A.

Therefore, a pump device can be obtained which can prevent a problem in liquid-tight sealing of the opening end of the accommodation hole.

FIG. 2 is a view showing another embodiment of the present invention. This embodiment is different from the above-described embodiment in that the cylinder 10 and the sealing member 1 in the above-described embodiment are different from each other.
7A is integrated.

That is, 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 10, and a bottom 13 of the cylinder 10 is provided. A pump chamber 14 is formed on the side.

The bottomed cylindrical cylinder 10 inserted and fixed in the accommodation hole 2 has a small-diameter body portion 15, a medium-diameter body portion 16,
A large-diameter body 17, a small-diameter body 15 is inserted into the small-diameter part 3 of the accommodation hole 2, a medium-diameter body 16 is inserted into the medium-diameter part 5,
The large-diameter trunk portion 17 is inserted into the large-diameter portion 4, whereby the large-diameter portion 4 and the medium-diameter portion 5 in the accommodation hole 2 are partitioned, and the opening end of the accommodation hole 2 is sealed. You. That is, the medium-diameter body 16 of the cylinder 10 serves as a partition body, and thereby the inside of the housing hole 2 is formed on the low-pressure side 2a where the suction passage 8 is opened.
And the high-pressure side 2b where the discharge passage 9 opens, while the large-diameter body 17 serves as a sealing bottom, whereby the opening end of the housing hole 2 is sealed.

In the cylinder 10 having a bottom, the flange 18 formed on the outer periphery of the large-diameter body 17 as a sealing bottom is fixed to the opening end of the accommodation hole 2 by caulking 19, whereby the accommodation hole is formed. It is fixed in 2.

The bottom portion 13 of the cylinder 10 is provided with a discharge chamber 20 and a recess 21 for substantially increasing the volume of the discharge chamber 20, and a plug member 23 having a discharge hole 22 is provided. The discharge hole 22 of the plug member 23
Communicates the pump chamber 14 and the discharge chamber 20.

The bottom portion 13 of the cylinder 10 is formed with a diametrical through-hole 24 crossing the discharge chamber 20, and the discharge chamber 20 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.

In the discharge chamber 20, 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 is accommodated. The check spring 26 is supported by the bottom of the depression 21 formed in the bottom 13 of the cylinder 10.

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.

In such a configuration, the driving cam 6 is rotated by a motor (not shown) via a driving shaft, and the plunger 12 is driven by the driving cam 6 to reciprocate to perform a pumping operation.

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 compression spring 31 inside, the inside of the pump chamber 14 becomes a negative pressure. Thereby, the hydraulic fluid in the reservoir (not shown) is guided from the suction passage 8 into the middle diameter portion 5 of the accommodation hole 2, and further, the through hole 30 of the cylinder 10, the plunger 1
2 through the circumferential groove 32, the through hole 33, the blind hole 34, and the suction valve 3
8 is opened to be sucked into the pump chamber 14. At this time, the discharge valve 28 closes the discharge hole 22 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 22.

When the plunger 12 is moved by the driving cam 6 toward the pump chamber 14 against the spring force of the compression spring 31, the ball valve 35 of the suction valve 38 is turned into the blind hole 34 by the spring force of the check spring 36. After sitting on the valve seat 37, the suction valve 38 is closed to prevent the hydraulic fluid in the pump chamber 14 from flowing into the blind hole 34, 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 22 and is discharged into the discharge chamber 20, and is further guided from the inside of the discharge chamber 20 to the inside of 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 the wheel cylinder (not shown) to the master cylinder side.

Here, in the above configuration, the cylinder 10 is inserted into the housing hole 2, and the partition body (medium diameter body) 16 opens the suction passage 8 in the housing hole 2. While partitioning into the low-pressure side 2a and the high-pressure side 2b where the discharge passage 9 is open, the sealing bottom (large-diameter body part) 17 seals the opening end of the housing hole 2; The inner diameter of the cylinder 10 is the part where the sealing bottom part 17 of the cylinder 10 is inserted (large diameter part 4)
Is formed to be larger than the inner diameter of the portion (medium diameter portion 5) of the cylinder 10 into which the partition body 16 is inserted.

For this reason, the partition body 1 of the cylinder 10
Even when the sealing bottom 17 is inserted, the inner peripheral surface of the housing hole 2 where the sealing bottom 17 is inserted is not damaged, and a problem occurs in the liquid-tight sealing of the opening end of the housing hole 2 by the sealing bottom 17. Is prevented beforehand.

Therefore, it is possible to obtain a pump device capable of preventing a problem in the liquid-tight sealing of the opening end of the housing hole 2 from occurring.

FIG. 3 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 body 45 is formed with a partition body 16 and a sealing bottom 17.

That is, in the embodiment shown in FIG. 3, 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, which is the same as in the embodiment shown in FIG. 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. The plug member 45 is provided with
And a large-diameter body 17, and the medium-diameter body 16 of the plug member 45 is inserted into the medium-diameter part 5 of the accommodation hole 2, and
7 is inserted into the large-diameter portion 4, whereby the large-diameter portion 4 and the middle-diameter portion 5 in the accommodation hole 2 are partitioned, and the opening end of the accommodation hole 2 is sealed. That is, the middle diameter body 16 of the plug member 45 serves as a partition body, and thereby the inside of the accommodation hole 2 has a low pressure side 2a on the small diameter part 3 side where the suction passage 8 opens and a high pressure side 2b where the discharge passage 9 opens. On the other hand, the large-diameter body portion 17 serves as a sealing bottom portion, whereby the opening end of the accommodation hole 2 is sealed.

Further, the plug member 45 has a flange 18 formed on the outer periphery of the large-diameter body 17 as a sealing bottom fixed to the opening end of the housing hole 2 by caulking 19, whereby the plug member 45 is fixed in the housing hole 2. I have.

The plug member 45 has a discharge hole 22 opened to the pump chamber 14 and a discharge chamber 20 communicating with the pump chamber 14 through the discharge hole 22. The discharge chamber 20 is opened at the opening end side of the housing hole 2 for convenience of forming the discharge chamber 20 and the discharge hole 22 in the plug member 45, and the opening end of the discharge chamber 20 is a spherical sealing member. Sealed by 49. The sealing member 49 is fixed by swaging 50.

The plug member 45 has a discharge chamber 20.
Is formed, and the discharge chamber 20 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 20 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 49 also serves as a spring receiver for the check spring 26.

A compression spring 31 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 31.

The plunger 12 has a small diameter portion 3 of the accommodation hole 2.
The plunger 12 has a diametrical through hole 5 opening in the circumferential groove 3 a of the small diameter portion 3.
1 and an axial blind hole 52 communicating with the through hole 51 and opening toward the pump chamber 14. A ball valve 35 is attached to the open end of the blind hole 52 by a check spring 3.
The suction valve 3 biased at 6 and adapted to the valve seat 37 of the blind hole 52
8 are provided.

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.

Even in such a configuration, the plunger 12 is reciprocally driven by the rotation of the driving cam 6,
The same pumping action as in the above embodiment is performed.

That is, the plunger 12 is connected to the pump chamber 14
The small diameter portion 3 of the receiving hole 2 is formed by the spring force of the compression spring 31 in the inside.
Of the pump chamber 14 by moving in the
The inside becomes negative pressure. As a result, the hydraulic fluid in the reservoir (not shown) is guided from the suction passage 8 into the circumferential groove 3a of the housing hole 2, and
Further, through the through hole 51 and the blind hole 52 of the plunger 12,
The suction valve 38 is opened to be sucked into the pump chamber 14. At this time, the discharge valve 28 is urged by the spring force of the check spring 26 so that the ball valve 25 is
7 and closes the discharge hole 22.

When the plunger 12 is moved by the driving cam 6 toward the pump chamber 14 against the spring force of the compression spring 31, the ball valve 35 of the suction valve 38 is closed by the spring force of the check spring 36. After sitting on the valve seat 37, the suction valve 38 is closed to prevent the hydraulic fluid in the pump chamber 14 from flowing into the blind hole 52, 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 22 and is discharged into the discharge chamber 20, and is further guided from the inside of the discharge chamber 20 to the inside of 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 the above configuration, the plug member 45 is inserted into the housing hole 2, and the partition body (medium diameter body) 16 opens the suction passage 8 through the housing hole 2. The low pressure side 2a on the small diameter part 3 side and the high pressure side 2b where the discharge passage 9 opens.
On the other hand, the sealing bottom (large-diameter body) 17 seals the opening end of the housing hole 2. At this time, the inner diameter of the housing hole 2 is determined by the sealing bottom 17 of the plug member 45. The inside diameter of the inserted portion (large-diameter portion 4) is
6 is formed to be larger than the inner diameter of the portion (medium diameter portion 5) into which it is inserted.

For this reason, even if the partition body 16 of the plug member 45 is inserted, the inner peripheral surface of the receiving hole 2 where the sealing bottom 17 is inserted is not damaged, and the sealing bottom 17 is not damaged.
This prevents a problem in the liquid-tight sealing of the opening end of the housing hole 2 due to the above.

Therefore, it is possible to obtain a pump device capable of preventing a problem in the liquid-tight sealing of the opening end of the housing hole 2 beforehand.

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 38 and the discharge valve 28, the ball valve 3
Although the embodiments using 5, 25 have been described, valves having various structures such as using a plate valve can be adopted without being limited thereto.

The embodiment in which the suction valve 38 is disposed in the pump chamber 14 has been described. However, the suction valve 38 may be attached to the suction passage 8 or the suction valve 38 may be omitted to replace the body of the plunger 12. The opening and closing of the suction passage 8 may be configured as follows.

[0073]

As described above in detail, according to the present invention, it is possible to obtain a pump device capable of preventing a problem from occurring in the liquid-tight sealing of the opening end of the accommodation hole.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Housing hole 2a Low pressure side 2b High pressure side 6 Drive cam 10 Cylinder 12 Plunger 14 Pump chamber 16 Medium diameter trunk (partition trunk) 17 Large diameter trunk (sealing bottom) 17A Sealing member

Claims (6)

[Claims] An accommodating hole formed through the housing to open a suction passage and a discharge passage of a working liquid; a sealing member inserted and fixed in the accommodating hole to seal an opening end of the accommodating hole. A cylinder having a bottomed cylindrical shape, which is also inserted and fixed in the housing hole, and has a partition body portion that partitions the inside of the housing hole into a low-pressure side where the suction passage opens and a high-pressure side where the discharge passage opens.
A plunger that is slidably housed in the cylindrical interior 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. Wherein the inner diameter of a portion where the sealing member is inserted is formed larger than the inner diameter of a portion where the partition body of the cylinder is inserted. 2. A housing hole formed through the housing to open a suction passage and a discharge passage of a working liquid, a sealing bottom portion inserted and fixed in the housing hole, and sealing an opening end of the housing hole. A bottomed cylindrical cylinder having a partition body that partitions the inside of the receiving hole into a low-pressure side where the suction passage opens and a high-pressure side where the discharge passage opens, and is slidably received in the cylindrical inside of the cylinder. A pump chamber is formed on the bottom side of the cylinder, and the plunger is reciprocally driven by a driving cam to perform a pumping operation. The housing hole is formed with a plurality of inner diameters, and the sealing bottom is inserted. A pump device, wherein the inner diameter of the portion is formed larger than the inner diameter of the portion into which the partition body of the cylinder is inserted. 3. A housing hole formed through the housing to open a suction passage and a discharge passage of the working liquid, a sealing bottom portion inserted and fixed in the housing hole, and sealing an opening end of the housing hole; A plug member having a partition body for partitioning the inside of the receiving hole into a low-pressure side where the suction passage opens and a high-pressure side where the discharge passage opens, and slidably received in the receiving hole and between the plug member. And a plunger reciprocatingly driven by a drive cam to perform a pumping operation, wherein the receiving hole is formed with a plurality of inner diameters, and a portion of the plug member into which the sealing bottom is inserted. A pump device, wherein an inner diameter is formed to be larger than an inner diameter of a portion into which the partition body is inserted. 4. The pump device according to claim 1, wherein a seal member is provided between an outer periphery of the sealing member and an inner periphery of the housing hole. 5. The pump device according to claim 2, wherein a seal member is provided between an outer periphery of a sealing bottom portion of the cylinder and an inner periphery of the housing hole. 6. The pump device according to claim 3, wherein a seal member is provided between an outer periphery of the sealing bottom portion of the plug member and an inner periphery of the housing hole.