JPH10331777A - Internal gear pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform combination of all coaxial worked parts through an internal gear pump wherein outer and inner rotors are eccentrically assembled together. SOLUTION: A rotation part 40 is contained in a columnar hole 50a formed in a housing 50, and the rotation part 40 is arranged such that the central axis of the columnar hole 50a and the central axis CL2 of an inner rotor 52 are made to coincide with each other. As a result of the so formed rotation part 40 being arranged, an outer rotor 51 is arranged in a given position situated eccentrically from the central axis of the columnar hole 50a. Though a gap is provided between the outer periphery of the outer rotor 51 arranged in a given position situated eccentrically from the central axis of the conical hole 50a and the inner wall of the columnar hole 50a, the gap is radially filled with an inner cylinder 71 to rotatably hold the outer rotor 51 and the positioning ring 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal gear pump for sucking and discharging a fluid and a brake device using the internal gear pump, and more particularly to an internal gear pump such as a trochoid pump or a pigot pump.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view of a trochoid pump as an example of a conventional internal gear pump. As shown in FIG. 4, a rotor chamber 150a formed in a housing 150 of the trochoid pump is provided.
Inside, the outer rotor 151 and the inner rotor 15
2 are assembled and stored.

[0003] An outer rotor 151 has an inner tooth portion 151 on its inner periphery.
The inner rotor 152 has a drive shaft 154 fixed at the center and external teeth 152a at the outer periphery.
It has. The external teeth 152a have the internal teeth 15
1a, the outer teeth 152a and the inner teeth 151 are partially engaged with each other, so that a plurality of tooth chambers 153 are formed between the outer rotor 151 and the inner rotor 152. Become.

[0004] An outer rotor 151 is rotatably incorporated in a rotor chamber 150a of a housing 150. Further, a suction port 160 and a discharge port 161 are formed on both sides of the center axis of both rotors 151 and 152 in the rotor chamber 150a of the housing 150.

[0005] When the pump is driven, the inner rotor 152 rotates via the drive shaft 154, and the outer rotor 151 also rotates in the same direction due to the meshing of the outer teeth 152a and the inner teeth 151a. At this time, when the outer rotor 151 and the inner rotor 152 come into contact with each other, a tooth space 153 formed between the rotors 151 and 152 is formed.
The volume of the outer rotor 151 and the inner rotor 1
During one rotation of 52, the size of the oil changes from small to large, and oil is sucked from the suction port 160, and is discharged from the discharge port 161.

[0006] In this trochoid pump, as described above, since the inner teeth 151a of the outer rotor 151 and the outer teeth 152a of the inner rotor 152 are only partially engaged with each other, the outer rotor 151 and the inner rotor 152 are connected to each other. It will be eccentrically assembled. Specifically, the inner rotor 152 is
4, the outer rotor 151 is eccentric with respect to the center axis of the drive shaft 154.

On the other hand, when the inner rotor 152 rotates, the outer rotor 151 is given a rotating action at the meshing portion between the above-mentioned inner tooth portion 151a and the outer tooth portion 152a. Need to rotate. Therefore, the outer rotor 15
1 of the housing 150 accommodating the housing 1
Is the central axis of the inner rotor 152, that is, the drive shaft 1
It will be formed as a cylindrical hole eccentric from 5 central axes.

As described above, since it is necessary to rotate the outer rotor 151 eccentrically with respect to the inner rotor 152, the rotor chamber 150 in the housing 150 described above is required.
a etc. could not be realized by coaxial processing. In addition,
Such a problem similarly arises in the case of a configuration in which the outer rotor and the inner rotor are eccentrically assembled, such as an internal gear pump.

The present invention has been made in view of the above problems, and has as its object to realize an internal gear pump in which an outer rotor and an inner rotor are eccentrically assembled, but all of which can be realized by a combination of coaxial processing parts. I do.

[0010]

In order to achieve the above object, the following technical means are employed. The invention according to claim 1 is an inner rotor having an inner tooth portion on an inner periphery, and an outer rotor portion provided with rotational motion by a drive shaft and meshing with the inner tooth portion of the outer rotor on an outer periphery. And a housing provided with a rotating part configured to be eccentrically assembled by a predetermined amount, and a housing provided with a cylindrical hole for accommodating the rotating part, wherein the cylindrical hole is provided in the cylindrical hole. The rotating part is arranged so that the central axis of the hole coincides with the central axis of the inner rotor, and the outer periphery of the outer rotor arranged at a predetermined position eccentric to the central axis of the cylindrical hole by the arrangement of the rotating part. An outer rotor positioning member that radially fills a gap between the outer rotor and the inner wall of the cylindrical hole, and the outer rotor rotates at the predetermined position by the outer rotor positioning member. Characterized in that it is configured as is.

The present invention relates to an internal gear pump in which an outer rotor and an inner rotor are eccentrically assembled. As the internal gear pump, for example, a type in which a tooth chamber is formed by internal teeth of an outer rotor and external teeth of an inner rotor, such as a trochoid pump or a pigot pump, and a partition plate between both rotors There is a type in which (Crescent) is interposed.
Then, the basic pump operation of sucking the fluid from the suction port by the rotation of the rotating unit and discharging the fluid through the discharge port can be performed.

The rotating part is accommodated in a cylindrical hole provided in the housing. In the internal gear pump of the present invention, the center axis of the cylindrical hole is aligned with the center axis of the inner rotor. A rotating part is arranged. As a result of arranging the rotating parts in this way, the outer rotor is arranged at a predetermined position eccentric with the center axis of the cylindrical hole.
A gap is formed between the outer periphery of the outer rotor disposed at a predetermined position eccentric with the center axis of the cylindrical hole and the inner wall of the cylindrical hole. The outer rotor positioning member defines the gap in the radial direction. Fill in. As a result, the outer rotor becomes rotatable at a predetermined position.

Therefore, the rotating portion can be arranged so that the central axis of the cylindrical hole coincides with the central axis of the inner rotor without hindering the function as the inscribed gear pump described above. As a result, although the outer rotor and the inner rotor are eccentrically assembled internal pumps, they can all be realized by a combination of coaxial processing parts. This facilitates processing and leads to cost reduction.

As the outer rotor positioning member, a first cylindrical positioning member which accommodates the outer rotor therein and rotatably holds the outer rotor, the first positioning member and the circle A configuration may also be provided that includes a second positioning member that radially fills a gap between the columnar hole and the inner wall. This is because the outer rotor is rotatably held as a first positioning member.
And a second role arranged at a predetermined position eccentric to the center axis of the cylindrical hole, and the first role is realized by the first positioning member. And the second
With regard to the role of (1), the first positioning member is disposed at a predetermined position by the second positioning member, and as a result, the outer rotor is disposed at the predetermined position.

The first positioning member has a cylindrical shape that accommodates the outer rotor therein and rotatably holds the outer rotor, but the second positioning member may be arranged in various positions and in various forms. For example, when a part of the first positioning member is in contact with the inner wall of the cylindrical hole, it is sufficient to dispose a second positioning member to fill a part of the gap at the opposite side. is there. For example, the number may be one or two or more.

The second positioning member may be provided separately from the housing and the first positioning member, and may be interposed in the above-described gap, or may be integrated with the inner wall of the cylindrical hole of the housing. Or provided integrally with the outer periphery of the first positioning member.

When interposed as a separate member in the gap,
For example, it can be formed into a pin shape or a ball shape. Of course, other shapes may be used. Also,
The second positioning member may be manufactured by injection molding of a resin. On the other hand, when the second positioning member is integrally provided on the inner wall of the cylindrical hole of the housing or integrally on the outer periphery of the first positioning member, for example, a hemispherical projection may be used. Of course, other shapes may be used.

Also, the outer rotor positioning member is not realized by the first positioning member and the second positioning member, but is directly in contact with the outer rotor to position the outer rotor at a predetermined position. It is good also as a structure which supports rotatably.

In this case, the outer rotor positioning member may be provided separately from the housing in the gap between the housing and the outer rotor, or may be integrated with the inner wall of the cylindrical hole of the housing. Can also be provided. In the case where the first positioning member and the second positioning member are configured as described above, they can be integrally provided on the outer periphery of the first positioning member. Therefore, when they are provided integrally, only the inner wall of the cylindrical hole of the housing is provided.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the “internal gear pump”
A case where the present invention is realized as a trochoid pump as an example will be described.

FIG. 1A is a schematic view of a trochoid pump 10 according to the embodiment. FIG. 1 (b) shows FIG.
(A) is a cross-sectional view taken along the line AA. First, FIG.
The structure of the trochoid pump 10 will be described based on FIG. The housing 50 of the trochoid pump 10 is provided with a cylindrical hole 50a, and the rotating portion 40 and the like are housed in the cylindrical hole 50a.

The rotating section 40 comprises an outer rotor 51 and an inner rotor 52. A drive shaft 54, which is driven to rotate by a motor (not shown), is fitted to the inner rotor 52, and the inner rotor 52 is configured to be given a rotational motion via the drive shaft 54. Also,
Central axis CL1 of outer rotor 51 and inner rotor 5
The center axis CL2 of the two rotors 51 and 52 is eccentric with respect to the center axis CL2 of the two rotors 51 and 52. Since the center axis of the drive shaft 54 coincides with the center axis CL2 of the inner rotor 52, the center axis CL1 of the outer rotor 51 is also eccentric with respect to the drive shaft 54.

The outer rotor 51 has inner teeth 511 on its inner periphery.
, And the inner rotor 52 has external teeth 521 on the outer periphery. The external teeth portion 521 has one less tooth than the internal teeth portion 511. The outer rotor 51 and the inner rotor 52 are connected to the plurality of tooth chambers 5.
3 and are meshed on the meshing surface S. In addition,
In order to transmit the rotation torque of the inner rotor 52, the inner rotor 52 and the outer rotor 51 have a plurality of contact points on the meshing surface S.

In this embodiment, the outer rotor 51 is housed inside a cylindrical inner cylinder 71. The inner cylinder 71 has the same thickness as the outer rotor 51 or is set to be thicker than the outer rotor 51 by a predetermined amount. The inner diameter of the inner cylinder 71 is set to be larger than the outer diameter of the outer rotor 51 by a predetermined amount, and there is a predetermined clearance between the two.
1 is rotatable.

The rotating section 40 composed of the outer rotor 51 and the inner rotor 52 and the outer rotor 5
The inner cylinder 71 for rotatably holding 1 is rotatably held by two side plates 31 and 32 arranged so as to sandwich them from both sides. At least one side plate has a suction port 60 and a discharge port 61 formed on the left and right sides of the drive shaft 54. The suction port 60 and the discharge port 61 are disposed at positions communicating with a plurality of tooth chambers 53 formed by the outer rotor 51 and the inner rotor 52 meshing with each other. The working fluid in the tooth chamber 53 can be discharged through the discharge port 61 to the outside.

As described above, the rotating part 40 and the inner cylinder 71 are arranged in the cylindrical hole 50a of the housing 50 while being sandwiched between the side plates 31, 32. In the case of the present embodiment, The inner diameter of the cylindrical hole 50a of the housing 50 is set to a size obtained by adding a predetermined amount d2 to the outer diameter of the inner cylinder 71. This predetermined amount d2 is twice (d2 = d1 × 2) the eccentric amount d1 of the center axis CL1 of the outer rotor 51 and the center axis CL2 of the inner rotor 52 described above.

Therefore, when the inner cylinder 71 is in contact with the inner wall of the cylindrical hole 50a, the center axis CL1 of the inner cylinder 71 and the outer rotor 51 is shifted from the center axis of the cylindrical hole 50a. The central axis CL2 of the rotor 52 coincides with the central axis of the cylindrical hole 50a. That is, in order to make the center axis CL2 of the inner rotor 52 coincide with the center axis of the cylindrical hole 50a,
This is the setting.

However, when a part of the inner cylinder 71 is in contact with the inner wall of the cylindrical hole 50a, a gap is formed between the inner cylinder 71 and the inner wall of the cylindrical hole 50a on the opposite side. Become. Therefore, in the present embodiment, the cylindrical positioning pin 72 is arranged in parallel with the center axis CL2 of the inner rotor 52 and the like in order to fill the gap in the radial direction. In the case of FIG. 1, since only one positioning pin 72 is disposed at a position where the gap between the inner cylinder 71 and the inner wall of the cylindrical hole 50a is maximized, the outer diameter of the positioning pin 72 is as described above. Predetermined amount d2
Will match.

The length of the positioning pin 72 is made larger than the thickness of the outer rotor 51. for that reason,
As shown in FIG. 1B, the positioning pins 72
When both are disposed, both ends thereof protrude from the outer rotor 51, but are inserted into the insertion holes 31 a and 32 a provided in the side plates 31 and 32. Also,
Thus, the insertion holes 31a of the side plates 31 and 32,
32a, both ends are inserted and arranged.
Will be fixed.

In this embodiment, the inner cylinder 71 corresponds to a "first positioning member" because the inner cylinder 71 accommodates the outer rotor 51 therein and rotatably holds the outer rotor 51, and the positioning pin 72 corresponds to the inner cylinder 71. Since the gap between the cylindrical hole 50a and the inner wall is filled in the radial direction, it corresponds to the “second positioning member”. The inner cylinder 71 and the positioning pin 72 correspond to an “outer rotor positioning member”.

According to the trochoid pump 10 of the present embodiment described above, the rotating part 40 is accommodated in the cylindrical hole 50a provided in the housing 50.
The rotating unit 40 is arranged so that the center axis of the center line a coincides with the center axis CL2 of the inner rotor 52. As a result of arranging the rotating part 40 in this manner, the outer rotor 51 is arranged at a predetermined position eccentric with the center axis of the cylindrical hole 50a. A gap is formed between the outer periphery of the outer rotor 51 and the inner wall of the cylindrical hole 50a which are arranged at a predetermined position eccentric with the central axis of the cylindrical hole 50a, but the outer rotor 51 is rotatable. This gap is filled in the radial direction by the inner cylinder 71 and the positioning pin 72 held.

As described above, the rotating part 4 is so arranged that the center axis of the cylindrical hole 50a and the center axis CL2 of the inner rotor 52 coincide without interrupting the function as the trochoid pump.
As a result, although the outer rotor 51 and the inner rotor 52 are eccentrically assembled in the trochoid pump, they can be all realized by a combination of coaxial processing parts. This facilitates processing and leads to cost reduction.

As described above, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist of the present invention. I will explain some of them. (1) In the above embodiment, the positioning pin 72 is formed in a cylindrical shape, and only one positioning pin 72 is disposed at a position where the gap between the inner cylinder 71 and the inner wall of the cylindrical hole 50a is maximized.
Various arrangements and arrangements are conceivable.

For example, as shown in FIG. 2A, two positioning pins 72a and 72b may be arranged at a predetermined distance from each other. However, when only one gap is provided at the position where the gap between the inner cylinder 71 and the inner wall of the cylindrical hole 50a is maximized as shown in FIG. 1A, the outer diameter of the positioning pin 72 is equal to the predetermined amount d2. It is sufficient to make them coincide with each other, but when two are arranged as shown in FIG. 2A, it is necessary to prepare one having a small outer diameter. Of course, three or more may be used.

In the above embodiment, the positioning pins 7
Although 2 is cylindrical, other shapes such as a ball may be used. Further, it may be manufactured by injection molding of a resin. (2) In the above embodiment, the positioning pin 72 is configured as a member separate from the housing 50 and the inner cylinder 71. It can also be provided integrally. FIG.
In (a), only one positioning pin 72 is located at a position where the gap between the inner cylinder 71 and the inner wall of the cylindrical hole 50a is maximized.
Are provided integrally with the inner cylinder 71 at the same place where the positioning cylinder 72 is disposed. Also,
FIG. 2C shows a positioning pin 7 opposite to FIG.
The positioning projection 272 having the same function as the second projection 2 is integrally provided on the housing 50, specifically, on the inner wall of the cylindrical hole 50a. Of course, two or more positioning projections 172 and 272 can be provided as in the case of using two positioning pins 72a and 72b in FIG.

The positioning projections 172, 272
When integrally provided on the housing 50 and the inner cylinder 71 as described above, for example, a semi-cylindrical or hemispherical projection may be used. Of course, other shapes may be used. (3) In the above embodiment, the “outer rotor positioning member” is realized by the inner cylinder 71 that rotatably holds the outer rotor 51 and the positioning pin 72. It is possible. FIG. 3 shows a case in which the inner cylinder 71 is not used and only the positioning pins 72 are used. In this case, the positioning pin 72 directly contacts the outer rotor 51, and the outer rotor 51 is rotatably supported at a predetermined position.

In this case, too, instead of the positioning pin 72,
The positioning protrusion may be integrally provided on the inner wall of the cylindrical hole 50a of the housing 50. (4) In the above embodiment, the case where the trochoid pump is realized as an example of the internal gear pump has been described. However, a partition plate (crescent) between the outer rotor and the inner rotor, which is the same as the internal gear pump's piggot pump or the inner rotor. It is also possible to realize a type in which is interposed.

[Brief description of the drawings]

FIG. 1A is a schematic view of a trochoid pump according to an embodiment, and FIG. 1B is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a schematic view showing another embodiment.

FIG. 3 is a schematic view showing another embodiment.

FIG. 4 is a schematic view of a conventional trochoid pump.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Trochoid pump 31, 32 ... Side plate 31a, 32a ... Insert hole 40 ... Rotating part 50 ... Housing 50a ... Cylindrical hole 51 ... Outer rotor 52 ... Inner rotor 53 ... Tooth chamber 54 ... Drive shaft 60 ... Suction port 61 ... Discharge port 71 ... Inner cylinder 72,72a, 72b ... Positioning pin 172,272 ... Positioning protrusion 511 ... Inner tooth part 521 ... Outer tooth part

Claims (6)

[Claims] 1. An outer rotor having an inner tooth portion on an inner periphery thereof, and an inner rotor having an outer tooth portion provided with a rotational motion by a drive shaft and being engaged with the inner tooth portion of the outer rotor on an outer periphery. An inscribed gear pump comprising: a rotating part configured to be assembled with a fixed eccentricity; and a housing provided with a cylindrical hole for accommodating the rotating part, wherein a central axis of the cylindrical hole is provided in the cylindrical hole. And the central axis of the inner rotor coincides with the central axis of the inner rotor, and the outer periphery of the outer rotor and the cylindrical shape arranged at a predetermined position eccentric to the central axis of the cylindrical hole by the arrangement of the rotational section. An outer rotor positioning member that radially fills a gap between the hole and the inner wall, the outer rotor being rotatable at the predetermined position by the outer rotor positioning member. An internal gear pump characterized in that: 2. The outer rotor positioning member includes a cylindrical first positioning member that houses the outer rotor therein and rotatably holds the outer rotor, and a gap between the first positioning member and an inner wall of the cylindrical hole. 2. The internal gear pump according to claim 1, further comprising: a second positioning member that radially fills the second positioning member. 3. The internal gear pump according to claim 2, wherein the second positioning member is provided integrally with an inner wall of the cylindrical hole of the housing. 4. The internal gear pump according to claim 2, wherein the second positioning member is provided integrally on an outer periphery of the first positioning member. 5. The outer rotor positioning member according to claim 1, wherein the outer rotor positioning member is configured to directly contact the outer rotor to rotatably support the outer rotor at the predetermined position. Internal gear pump. 6. The internal gear pump according to claim 1, wherein the outer rotor positioning member is provided integrally with an inner wall of a cylindrical hole of the housing.