JPH09133084A - Multiple gear pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a multiple gear pump is small size and lighten assembly work. SOLUTION: A pump is constituted by a drive shaft 3 torque transmittable with drive side gears 1, 2, driven shaft 5 of a driven side gear 4 meshed with the drive side gear 1, driven shaft 7 of a driven side gear 6 meshed with the drive side gear 2 and a casing 8, a structure is such that one of the drive side gear 1, 2 is fitted to the drive shaft 3. The casing 8 is formed into a three- divided structure, such as a casing part 10 formed with a journal part 10a of the drive shaft 3, journal part 10b of the driven shaft 5, and a pump chamber 10c storing the drive gear 1 and the driven gear 4, and a casing part 11 formed with a cover part 11a of the pump chamber 10c, journal part 11b of the drive shaft 3, journal part 11c of the driven shaft 5, journal part 11d of the driven shaft 7 and a pump chamber 11e storing the drive side gear 2 and the driven side gear 6, and a casing part 12 formed with a cover part 12a of the pump chamber 11e, journal part 12b of the drive shaft 3 and a journal part 12c of the driven shaft 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention draws fluid from an intake port formed in a casing by meshing rotation of a driving side gear and a driven side gear, and also surrounds a plurality of pump chambers formed in the casing. The present invention relates to a multiple gear pump configured to discharge along a surface and then discharge from a plurality of discharge ports formed in a casing.

[0002]

2. Description of the Related Art Conventionally, in a double gear pump which is one example of the above-mentioned multiple gear pump, a driving gear can transmit torque as disclosed in Japanese Utility Model Publication No. 7-29263. The drive shaft attached to, and
A driven shaft equipped with a driven gear that meshes with the drive gear,
In addition, two sets of single type having a casing having a two-part structure composed of a first casing part in which a pump chamber for accommodating the drive side gear and the driven side gear is formed, and a second casing part for closing the pump chamber A gear pump is provided, and by directly connecting the two sets of independent gear pumps so that power can be transmitted, the size as a dual gear pump is smaller than when connecting the two sets of independent gear pumps via a connecting plate. Some of them are configured so as to reduce cost and manufacturing cost.

[0003]

However, the dual gear pump according to the above-mentioned prior art is compared with one in which two sets of independent gear pumps are connected through a connecting plate.
Although it is possible to reduce the size and manufacturing cost of the dual gear pump, since two sets of single gear pumps are directly connected, there are many unnecessary parts for the dual gear pump. The casing as the dual gear pump necessarily has a four-division structure, and the number of parts and the number of assembling steps increase in proportion to the number of divisions.
That is, there is room for improvement in downsizing as a dual gear pump, reduction in manufacturing cost, and reduction in assembly work.

An object of the present invention is to make it possible to reduce the size of the multiple gear pump, reduce the manufacturing cost, and reduce the assembling work.

[0005]

In order to achieve the above object, in the invention according to claim 1 of the present invention, a drive shaft in which a first drive side gear and a second drive side gear are mounted so that torque can be transmitted. A first driven shaft equipped with a first driven gear that meshes with the first drive gear, and a second driven shaft equipped with a second driven gear that meshes with the second drive gear;
A casing that surrounds them, and one of the first drive side gear and the second drive side gear is attached to the drive shaft by fitting connection, and the casing is the drive shaft. A first shaft supporting part for supporting the first driven shaft, a second shaft supporting part for supporting the first driven shaft, and a first pump chamber accommodating the first drive side gear and the first driven side gear. A first casing part, a first cover part for closing the first pump chamber, a first shaft supporting part for supporting the drive shaft, a second shaft supporting part for supporting the first driven shaft, and A second casing part in which a third shaft supporting part for supporting the second driven shaft and a second pump chamber accommodating the second drive side gear and the second driven side gear are formed, and the second pump. A second cover portion that closes the chamber; a first shaft support portion that supports the drive shaft; And a three-divided structure of the third casing portion and the third shaft support for rotatably supporting the driven shaft is formed.

According to the first aspect of the invention, when assembling the double gear pump which is an example of the multiple gear pump, first, the drive shaft is inserted through the first shaft support portion of the second casing portion. The drive side gear not mounted on the drive shaft is fitted and connected to the insertion end side of the drive shaft. Then, one end of the first driven shaft is pivotally supported by the second shaft support portion of the second casing portion, and the first driven gear is meshed with the first drive gear. Then, the first casing part, one end of the drive shaft to the first shaft support part,
The other end of the first driven shaft is supported by the second shaft support portion, and the first drive gear and the first driven gear are housed in the first pump chamber, and To close the pump chamber with the first cover part of the second casing part,
It is connected to one end of the second casing part. Next, while supporting one end of the second driven shaft with respect to the third shaft support part of the second casing part, with respect to the second drive side gear stored in the second pump chamber of the second casing part To engage the second driven gear. Thereafter, the third casing part is supported by the first shaft support part at the other end of the drive shaft, the third shaft support part at the other end of the second driven shaft, and by the second cover part. The second casing is connected to the other end of the second casing so as to close the second pump chamber.

That is, according to the first aspect of the present invention, since the double gear pump can be constructed while the casing has the three-divided structure, two sets of the single gear pumps having the two-divided structure casing are provided. By directly connecting, the number of parts and the number of assembling steps can be reduced as compared with the case where the casing has a four-divided structure. Also,
Unlike the case where two sets of independent gear pumps are directly connected, it is not necessary to connect the drive shafts with each other by using a coupling or the like, so that the axial length of the double gear pump can be shortened accordingly. At the same time, the number of parts and the number of assembling steps can be further reduced.

By the way, in the case of constructing a triple gear pump, the casing thereof has a six-split structure, whereas a casing constructed by directly connecting three sets of independent gear pumps having a casing of a split structure has a six-split structure. In the invention described in claim 1, it is possible to form a four-division structure by only adding one second casing portion. That is, according to the invention described in claim 1, the more the gear pump is configured in a multiple manner, the more the number of parts and the number of assembling steps can be reduced. In addition, by replacing the drive shaft with a small and small one in which only the first drive-side gear is mounted and connecting the third casing part directly to the first casing part, it is possible to configure an independent gear pump. is there.

Therefore, it has become possible to reduce the size of the multiple gear pump, reduce the manufacturing cost, and reduce the assembling work.

According to the second aspect of the present invention,
A first driven shaft on which a first driven gear and a second driven gear are mounted so that torque can be transmitted; and a drive shaft on which a driven gear meshing with the first driven gear is mounted so that torque can be transmitted, A second driven shaft, on which a third driven gear that meshes with the second driven gear is mounted, and a casing that surrounds them, and one of the first driven gear and the second driven gear is used. A structure in which the first driven shaft is fitted and coupled to the first driven shaft, the casing includes a first shaft supporting portion that pivotally supports the drive shaft, and a second shaft supporting portion that pivotally supports the first driven shaft, A first casing portion in which a first pump chamber that houses the drive-side gear and a first driven-side gear is formed, a first cover portion that closes the first pump chamber, and the drive shaft is pivotally supported. A first shaft support part, and a second shaft support part which supports the first driven shaft, A second casing part in which a third shaft supporting part for supporting the second driven shaft and a second pump chamber for accommodating the second driven side gear and the third driven side gear are formed, and the second A third casing part formed with a second cover part that closes the pump chamber, a second shaft support part that axially supports the first driven shaft, and a third shaft support part that axially supports the second driven shaft. It has a divided structure.

According to the second aspect of the invention, when assembling the double gear pump, which is an example of the multiple gear pump, first, the first driven shaft is attached to the second shaft support of the second casing. The driven side gear that is not mounted on the first driven shaft is fitted and connected to the insertion end side of the first driven shaft. Then, one end of the drive shaft is pivotally supported by the first shaft support portion of the second casing portion, and the drive side gear is meshed with the first driven side gear. afterwards,
The first casing part has the other end of the drive shaft supported on the first shaft support part, and the one end of the first driven shaft supported on the second shaft support part. The gear and the first driven-side gear are housed, and the first pump chamber is connected to one end of the second casing so as to be closed by the first cover of the second casing. Next, while supporting one end of the second driven shaft with respect to the third shaft support part of the second casing part, with respect to the second driven side gear stored in the second pump chamber of the second casing part To engage the third driven gear. After that, the third casing part,
The other end of the first driven shaft is pivotally supported by the second shaft support part, and the other end of the second driven shaft is pivotally supported by the third shaft support part, and the second cover part closes the second pump chamber. Thus, the second casing portion is connected to the other end portion.

That is, according to the second aspect of the present invention as well, since the double gear pump can be constructed while the casing has a three-divided structure, two sets of independent gear pumps having the two-divided casing are provided. By directly connecting, the number of parts and the number of assembling steps can be reduced as compared with the case where the casing has a four-divided structure. Also,
Unlike the case where two sets of independent gear pumps are directly connected, it is not necessary to connect the drive shafts with each other by using a coupling or the like, so that the axial length of the double gear pump can be shortened accordingly. At the same time, the number of parts and the number of assembling steps can be further reduced. Moreover, also in the invention described in claim 2, as in the case of the invention described in claim 1, when a triple gear pump is constructed, only one second casing portion is added to the casing thereof. Since the structure can be divided into four, the number of parts and the number of assembling steps can be further reduced as the gear pump is configured in a multiple manner, and only the first driven side gear is mounted on the first driven shaft. By replacing the short casing with a short casing and directly connecting the third casing to the first casing, a single gear pump can be constructed.

Therefore, also in the invention described in claim 2, the multiple gear pump can be downsized, the manufacturing cost can be reduced, and the assembling work can be reduced.

In the invention according to claim 3 of the present invention,
A drive shaft on which a first drive-side gear and a second drive-side gear are mounted so that torque can be transmitted; a first driven shaft on which a first driven-side gear that meshes with the first drive-side gear is mounted; A second driven shaft, on which a second driven gear that meshes with the drive gear is mounted, and a casing that surrounds them,
A two-part structure in which a first drive shaft portion having the first drive gear mounted thereon and a second drive shaft portion having the second drive gear mounted thereon are connected to the drive shaft in a torque-transmittable manner. age,
The casing houses a first shaft support part that supports the first drive shaft part, a second shaft support part that supports the first driven shaft, the first drive side gear and the first driven side gear. A first casing part having a first pump chamber formed therein, a first cover part closing the first pump chamber, and a first shaft pivotally supporting the first drive shaft part and the second drive shaft part. A supporting portion, a second supporting portion that pivotally supports the first driven shaft, a third supporting portion that pivotally supports the second driven shaft, a second drive-side gear and a second driven-side gear A second casing part in which two pump chambers are formed, a second cover part that closes the second pump chamber, a first shaft support part that pivotally supports the second drive shaft part, and the second driven shaft. The third casing part is formed in a three-divided structure in which a third shaft supporting part for supporting the is formed.

According to the third aspect of the present invention, when assembling the double gear pump, which is an example of the multiple gear pump, first, the first drive shaft portion with respect to the first shaft support portion of the first casing portion is first assembled. The first drive side gear is housed in the first pump chamber. Then, one end of the first driven shaft is pivotally supported by the second shaft support portion of the first casing portion, and the first driven gear is meshed with the first drive gear. After that, one end of the second casing part is supported, the other end of the first drive shaft part is supported by the first shaft support part, and the other end of the first driven shaft is supported by the second shaft support part. , The first cover portion is connected to the first casing portion so as to close the first pump chamber. Next, one end of the second drive shaft portion is rotatably supported by the first shaft support portion of the second casing portion, and the other of the first drive shaft portion previously rotatably supported by the first shaft support portion. The one end of the second drive shaft portion is connected to the end so that torque can be transmitted, and the second drive gear is housed in the second pump chamber of the second casing portion. Then, one end of the second driven shaft is pivotally supported by the third shaft support portion of the second casing portion, and the second driven gear is meshed with the second drive gear. After that, the third casing part is rotatably supported by the other end of the second drive shaft part by the first shaft support part and the other end of the second driven shaft by the third shaft support part, and the second cover thereof is supported. The second casing is connected to the other end of the second casing so as to close the second pump chamber.

That is, according to the third aspect of the invention as well, since the double gear pump can be constructed while the casing has the three-divided structure, two sets of the single gear pumps having the two-divided casing are provided. By directly connecting, the number of parts and the number of assembling steps can be reduced as compared with the case where the casing has a four-divided structure. Moreover, also in the invention described in claim 3, as in the invention described in claims 1 and 2, in the case of configuring a triple gear pump, the casing thereof is provided with one second casing portion. Since it is possible to form a four-divided structure by simply adding, the number of parts and the number of assembling steps can be further reduced as the gear pump is configured in a multiple manner. Furthermore, since the drive shaft has a two-part structure, a single gear pump can be formed by directly connecting the third casing part to the first casing part without the need to prepare drive shafts of different lengths or the labor of replacing the drive shaft. Can be configured.

Therefore, also in the invention described in claim 3, the multiple gear pump can be downsized, the manufacturing cost can be reduced, and the assembling work can be reduced.
Moreover, according to the invention described in claim 3, the manufacturing cost can be reduced when the single gear pump is constructed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment, which is an embodiment based on the invention according to claim 1 of the present invention, will be described below with reference to the drawings.

FIG. 1 shows a vertical plane of a dual gear pump, which is an example of a multiple gear pump, and FIG. 2 shows a transverse side surface of the dual gear pump. Is a drive shaft 3 in which a first drive side gear 1 and a second drive side gear 2 are mounted so as to be able to transmit torque at a predetermined interval, and a first driven side gear 4 that meshes with the first drive side gear 1 is mounted. The second driven shaft 5 is mounted with the second driven gear 6 that meshes with the second driven gear 2, the second driven shaft 7 and the casing 8 surrounding them.

At one end of the drive shaft 3, an input portion 3a having an oval shape in a front view for taking in power by connecting with an output shaft (not shown).
Are formed. The first drive side gear 1 is attached to one end side of the drive shaft 3 by being integrally formed with the drive shaft 3.
The second drive gear 2 is mounted on the other end side of the drive shaft 3 by fitting connection with the drive shaft 3 with a steel ball 9 interposed.
The first drive gear 1 has the same diameter as the second drive gear 2 and is formed wider than the second drive gear 2. The first driven gear 4 is attached to the center of the first driven shaft 5 by being integrally formed with the first driven shaft 5. The second driven gear 6 is integrally formed with the second driven shaft 7 so that the second driven shaft 7 is formed.
It is installed in the center of. The first driven-side gear 4 has the same diameter as the second driven-side gear 6 and is formed wider than the second driven-side gear 6.

As shown in FIGS. 1 to 3, the casing 8 is
The first casing part 10, the second casing part 11, and the third casing part 12 are configured in a three-part structure. The first casing portion 10 has a first shaft support portion 10a that pivotally supports one end side (input portion 3a side) of the drive shaft 3, a second shaft support portion 10b that pivotally supports one end of the first driven shaft 5, and a first drive. The first pump chamber 10c that accommodates the side gear 1 and the first driven gear 4 in a meshed state, and the meshing start side of the first drive gear 1 and the first driven gear 4 in the first pump chamber 10c is outside. A suction port 10d for communicating with each other and a first discharge port 10e for communicating the meshing end side of the first drive side gear 1 and the first driven side gear 4 in the first pump chamber 10c with the outside are formed. The second casing portion 11 includes a first cover portion 11a that closes the first pump chamber 10c formed in the first casing portion 10, a first shaft support portion 11b that pivotally supports the middle of the drive shaft 3, and a first driven portion. Second shaft support 11 that supports the other end of the shaft 5
c, a third shaft support portion 11d that supports one end of the second driven shaft 7,
A second pump chamber 11e that houses the second drive gear 2 and the second driven gear 6 in a meshed state, and a meshing start side of the second drive gear 2 and the second driven gear 6 in the second pump chamber 11e. Pump chamber 10c in which the first casing portion 10 is formed
Communication passage 11f communicating with the second pump chamber 11
A second discharge port 11g is formed which communicates with the outside the engagement end side of the second drive gear 2 and the second driven gear 6 in e. In the third casing portion 12, a second cover portion 12a that closes the second pump chamber 11e formed in the second casing portion 11, a first shaft supporting portion 12b that pivotally supports the other end of the drive shaft 3, and a second A third shaft support portion 12c that supports the other end of the two driven shafts 7 is formed. First casing part 1
The first shaft support portion 10a of 0, the first shaft support portion 11b of the second casing portion 11, and the first shaft support portion 12b of the third casing portion 12 are naturally the respective casing portions 10, 1
In the state where 1 and 12 are connected, each axis is formed so as to coincide with each other. Further, the second shaft supporting portion 10b of the first casing portion 10 and the second shaft supporting portion 1 of the second casing portion 11
1c, the third shaft supporting portion 11d, and the third casing portion 1
The second shaft support portion 12c of No. 2 includes the casing portions 10, 11,
When the 12 are connected, the respective axes are formed to coincide with each other. The first pump chamber 10c of the first casing part 10 is the second pump chamber 11e of the second casing part 11.
It is formed deeper in the axial direction so as to have a larger capacity than that.

When assembling this double gear pump, first, the other end side of the drive shaft 3 is inserted into the first shaft supporting portion 11b of the second casing portion 11, and the middle portion thereof is paired with front and rear bushes. After being pivotally supported by the first shaft supporting portion 11b via the second shaft 13, the second driving side gear 2 is attached to the steel ball 9 on the other end side of the driving shaft 3.
Fit and connect via. And the second casing part 11
One end of the first driven shaft 5 is attached to the second shaft support portion 11c of the bush 1
The first driven gear 4 is meshed with the first drive gear 1 while being pivotally supported via Then, the first casing portion 10 is attached to the one end portion of the second casing portion 11.
The one end of the drive shaft 3 and the other end of the first driven shaft 5 are rotatably supported by the first shaft supporting portion 10a and the second shaft supporting portion 10b, respectively, via the bush 13. The first drive side gear 1 and the first driven side gear 4 are housed in the one pump chamber 10c in a meshed state, and the first pump chamber 10c
Are connected so as to be closed by the first cover portion 11a of the second casing portion 11. Next, the second casing part 11
One end of the second driven shaft 7 is attached to the third shaft supporting portion 11d of the bush 1
The second casing portion 11
The second driven gear 6 is meshed with the second drive gear 2 stored in the second pump chamber 11e. Thereafter, the third casing portion 12 is connected to the other end portion of the second casing portion 11, the other end of the drive shaft 3 is attached to the first shaft support portion 12b, and the second driven shaft 7 is attached to the third shaft support portion 12c. The other ends are axially supported via the bushes 13 and are connected so that the second cover portion 12a closes the second pump chamber 11e of the second casing portion 11.

Further, an output shaft (not shown) is connected to the input portion 3a of the drive shaft 3 in the dual gear pump constructed as described above, and piping is provided for the suction port 10d and the discharge ports 10e, 11g. By performing the above, the first drive-side gear 1 and the first driven-side gear 4 and the second drive-side gear 2 and the second driven-side gear 6 are meshed and rotated with the rotation of the drive shaft 3 to suck the fluid. After being sucked from the port 10d and flowing along the peripheral surfaces of the pump chambers 10c and 11e formed in the casing 8, it can be discharged from the discharge ports 10e and 11g. In addition, reference numeral 14 shown in FIGS.
It is a first side plate that balances the pressure of 0c. Reference numeral 15 is a second side plate that balances the pressure in the second pump chamber 11e. Reference numeral 16 is an oil seal that prevents leakage of fluid from the first shaft support portion 10a of the first casing portion 10. Reference numeral 17 indicates each casing portion 1 when the casing portions 10, 11 and 12 are connected.
It is a parallel pin that matches the phases of 0, 11, and 12. Reference numeral 18 is a screw hole 1 formed in the first casing portion 10.
Each casing part 10, 11, 12 is screwed to 0f.
It is a through bolt for connecting and fixing.

In other words, according to the above construction, a double gear pump can be constructed while the casing 8 has a three-divided structure, so that two sets of single gear pumps having a two-divided casing are directly connected. As a result, the number of parts and the number of assembling steps can be reduced as compared with the case where the casing has a four-divided structure. Further, unlike the case where two sets of independent gear pumps are directly connected, it is not necessary to connect the drive shafts with each other by using a coupling or the like, so that the axial length of the dual gear pump is shortened accordingly. In addition, the number of parts and the number of assembling steps can be further reduced.

By the way, in the case of constructing a triple gear pump, in the case where three sets of independent gear pumps having a casing of a two-divided structure are directly connected, the casing has a six-divided structure. In the configuration,
As shown in FIG. 4, the casing 8 can have a four-division structure in which only one second casing portion 11 is added. In other words, according to the above-mentioned configuration, the more the gear pump is configured in a multiple manner, the more the number of parts and the number of assembling steps can be reduced. In addition, the drive shaft 3 is replaced with a short one having only the first drive-side gear 1, and the first casing portion 10 is replaced with the third casing portion 1
If the two are directly connected, a single gear pump can be configured.

Therefore, it is possible to reduce the size of the multiple gear pump, reduce the manufacturing cost, and reduce the assembling work.

A second embodiment, which is an embodiment based on the invention according to claim 2 of the present invention, will be described below with reference to the drawings.

As shown in FIGS. 5 to 7, in the double gear pump, which is an example of the multiple gear pump in the second embodiment, the first driven gear 20 and the second driven gear 21 are separated by a predetermined distance. Driven shaft 2 mounted so that torque can be transmitted
2. A drive shaft 24 in which a drive gear 23 meshing with the first driven gear 20 is mounted so that torque can be transmitted, and a second driven shaft in which a third driven gear 25 meshing with the second driven gear 21 is mounted. 26, and a casing 27 that surrounds them.

The first driven gear 20 is attached to one end of the first driven shaft 22 by being integrally formed with the first driven shaft 22. The second driven gear 21 is fitted and connected to the first driven shaft 22 with the half-moon key 28 interposed therebetween.
2 is attached to the other end side. The first driven gear 20 is
The second driven gear 2 has the same diameter as the second driven gear 21 and
It is formed wider than 1. At one end of the drive shaft 24, there is formed an input portion 24a having an oval shape in a front view for taking in power by coupling with an output shaft (not shown). The drive-side gear 23 and the drive shaft 24 are integrally formed with each other.
It is installed in the center of. The third driven gear 25 is attached to the center of the second driven shaft 26 by being integrally formed with the second driven shaft 26. The drive gear 23 has the same diameter as the third driven gear 25 and is wider than the second driven gear 25.

The casing 27 has a first casing portion 29.
The second casing portion 30 and the third casing portion 31 are configured into a three-part structure. The first casing portion 29 has a first shaft support portion 29a that pivotally supports one end side (input portion 24a side) of the drive shaft 24, a second shaft support portion 29b that pivotally supports one end of the first driven shaft 22, and a drive side gear. 23 for accommodating the first driven side gear 20 and the first pump chamber 29c, and a suction port for communicating the meshing start side of the drive side gear 23 and the first driven side gear 20 in the first pump chamber 29c with the outside. 29d and the 1st discharge port 29e which connects the end side of meshing of the drive side gear 23 and the 1st driven side gear 20 in the 1st pump chamber 29c outside is formed. The second casing portion 30 includes a first cover portion 30 that closes the first pump chamber 29c formed in the first casing portion 29.
a, a first shaft support portion 30b that supports the other end of the drive shaft 24, a second shaft support portion 30c that supports the middle of the first driven shaft 22, and a third shaft that supports one end of the second driven shaft 26. The second pump chamber 30e for accommodating the support portion 30d, the second driven gear 21 and the third driven gear 25 in a meshed state, and the second driven gear 21 and the third driven gear 25 in the second pump chamber 30e. First pump chamber 29 in which the engagement start side is formed in the first casing portion 29
communication passage 30f communicating with c and second pump chamber 3
The second driven gear 21 and the third driven gear 25 at 0e
Second discharge port 30 for communicating the end of engagement with
g is formed. In the third casing portion 31, a second cover portion 31a that closes the second pump chamber 30e formed in the second casing portion 30, a second shaft supporting portion 31b that pivotally supports the other end of the first driven shaft 22, and A third shaft support portion 31c that supports the other end of the second driven shaft 26 is formed. The second shaft supporting portion 29b of the first casing portion 29, the second shaft supporting portion 30c of the second casing portion 30, and the second shaft supporting portion 31b of the third casing portion 31 are naturally the casing portions 29, 30, In the state in which 31 is connected, the respective axial cores are formed so as to coincide with each other. In addition, the first shaft support portion 29a of the first casing portion 29, the second casing portion 30.
The first shaft supporting portion 30b and the third shaft supporting portion 30d, and the third shaft supporting portion 31c of the third casing portion 31 have their respective shaft cores aligned with each other when the casing portions 29, 30, 31 are connected. Has been formed. First casing part 29
The first pump chamber 29c is deeply formed in the axial direction so as to have a larger capacity than the second pump chamber 30e of the second casing portion 30.

When assembling this double gear pump, first, the other end side of the first driven shaft 22 is inserted into the second shaft supporting portion 30c of the second casing portion 30, and the middle thereof is paired in the front-rear direction. After being pivotally supported through the bush 32 of the second driven shaft 22, the second driven gear 21 is attached to the other end of the first driven shaft 22.
It is fitted and connected via 8. And the second casing part 3
No. 0 first shaft support portion 30b, one end of the drive shaft 24 to the bush 3
The drive side gear 23 is meshed with the first driven side gear 20 while the shaft is supported via the shaft 2. Then, the first casing portion 29 is attached to the one end portion of the second casing portion 30.
The other end of the drive shaft 24 is supported by the first shaft support portion 29a, and one end of the first driven shaft 22 is supported by the second shaft support portion 29b via bushes 32, respectively. The drive side gear 23 and the first driven side gear 20 are accommodated in the one pump chamber 29c in a meshed state, and the first pump chamber 29c
Are connected so as to be closed by the first cover portion 30a of the second casing portion 30. Next, the second casing part 30
One end of the second driven shaft 26 is rotatably supported by the third shaft supporting portion 30d of the second casing portion 3 through the bush 32.
The third driven gear 25 is meshed with the second driven gear 21 which is accommodated in the second pump chamber 30e of 0. After that, the third casing portion 31 is attached to the other end portion of the second casing portion 30, the other end of the first driven shaft 22 is attached to the second shaft support portion 31b, and the second driven shaft is attached to the third shaft support portion 31c. The other ends of 26 are pivotally supported via bushes 32,
Moreover, the second cover portion 31a connects the second pump chamber 30e of the second casing portion 30 so as to close it.

In addition, an output shaft (not shown) is connected to the input portion 24a of the drive shaft 24 in the dual gear pump configured as described above, and piping is provided for the suction port 29d and the discharge ports 29e and 30g. By performing the above, the drive side gear 23 and the first driven side gear 20, and the second driven side gear 21 and the third driven side gear 25 are meshed and rotated with the rotation of the drive shaft 24, so that the fluid is sucked into the suction port 29.
After being sucked from d and flowing along the peripheral surfaces of the pump chambers 29c and 30e formed in the casing 27, it can be discharged from the discharge ports 28e and 30g. Reference numeral 33 shown in FIGS. 5 to 7 is a first side plate for balancing the pressure in the first pump chamber 29c. Reference numeral 34 is a second side plate that balances the pressure in the second pump chamber 30e. Code 35
Is an oil seal that prevents leakage of fluid from the first shaft support portion 29 a of the first casing portion 29. Reference numeral 36 is
It is a parallel pin that matches the phases of the casing portions 29, 30, 31 when the casing portions 29, 30, 31 are connected. Reference numeral 37 indicates each casing portion 29, 3 by being screwed into a screw hole 29f formed in the first casing portion 29.
It is a through bolt for connecting and fixing 0 and 31.

In other words, even in the above structure, a double gear pump can be formed while the casing 27 has a three-divided structure. Therefore, two sets of independent gear pumps having a two-divided structure casing should be directly connected. As a result, the number of parts and the number of assembling steps can be reduced as compared with a casing having a four-divided structure. In addition, it is not necessary to connect the drive shafts with each other by using a coupling as in the case of directly connecting two sets of independent gear pumps, so the axial length of the dual gear pump should be shortened accordingly. In addition, the number of parts and the number of assembling steps can be further reduced. Moreover, even in the case of the above-described configuration, when a triple gear pump is configured, as in the case of the above-described first embodiment, the casing 27 is formed by adding only one second casing portion 30. It can have a divided structure. That is, even in the case of the above-described configuration, the more the gear pump is configured in a multiple manner, the more the number of parts and the number of assembling steps can be reduced. Moreover, if the first driven shaft 22 is replaced with a small and small one in which only the first driven gear 20 is mounted and the third casing portion 31 is directly connected to the first casing portion 29, a single gear pump can be obtained. It is also possible to configure.

Therefore, even with the above structure, it is possible to reduce the size of the multiple gear pump, reduce the manufacturing cost, and reduce the assembling work.

A third embodiment, which is an embodiment based on the invention according to claim 3 of the present invention, will be described below with reference to the drawings.

As shown in FIGS. 8 to 10, in the dual gear pump which is an example of the multiple gear pump in the third embodiment, the first drive gear 40 and the second drive gear 41 are separated by a predetermined distance. Drive shaft 42 mounted so that torque can be transmitted,
A first driven shaft 44 having a first driven gear 43 that meshes with the first drive gear 40 and a second driven gear 45 that meshes with the second drive gear 41. The driven shaft 46 and the casing 4 surrounding them.
7 and the like.

The drive shaft 42 has a two-part structure composed of a first drive shaft portion 42A and a second drive shaft portion 42B which are coupled to each other via a coupling 48 so that torque can be transmitted. The first drive shaft portion 42A has, at one end, an input portion 42 having an oval shape in a front view for taking in power by coupling with an output shaft (not shown).
A is formed, and a first drive gear 40 is integrally formed at the substantially center thereof. The second drive gear 41 is integrally formed in the center of the second drive shaft portion 42B.
The first drive gear 40 has the same diameter as the second drive gear 41,
Moreover, it is formed wider than the second drive-side gear 41. The first driven gear 43 is attached to the center of the first driven shaft 44 by being integrally formed with the first driven shaft 44. The second driven gear 45 is attached to the center of the second driven shaft 46 by being integrally formed with the second driven shaft 46. The first driven gear 43 has the same diameter as the second driven gear 45 and is formed wider than the second driven gear 45.

The casing 47 has a first casing portion 49.
The second casing portion 50 and the third casing portion 51 are configured in a three-part structure. The first casing portion 49 has one end side of the first drive shaft portion 42A (the input portion 42a).
Side), a first shaft supporting portion 49a, a second shaft supporting portion 49b that supports one end of the first driven shaft 44, and a first driving side gear 40 and a first driven side gear 43 which are housed in a meshed state. One pump chamber 49c and a first discharge port 49d that communicates with the outside the meshing end side of the first drive gear 40 and the first driven gear 20 in the first pump chamber 49c are formed. The second casing portion 50 includes the first casing portion 49.
Cover 50a that closes the first pump chamber 49c formed in the first drive shaft portion, the other end of the first drive shaft portion 42A and the first drive shaft portion 50b that supports one end of the second drive shaft portion 42B, and the first driven shaft. A second shaft support portion 50c that pivotally supports the other end of 44, a third shaft support portion 50d that pivotally supports one end of the second driven shaft 46, a second drive side gear 41 and a second driven side gear 45 are housed in a meshed state. A communication passage that connects the second pump chamber 50e, the meshing start side of the second drive gear 41 and the second driven gear 45 in the second pump chamber 50e, to the first pump chamber 49c formed in the first casing portion 49. A second discharge port 50g is formed to communicate with the outside 50f and a side where the meshing of the second drive gear 41 and the second driven gear 45 in the second pump chamber 50e ends. In the third casing portion 51, a second cover portion 51a that closes the second pump chamber 50e formed in the second casing portion 50, a first shaft support portion 51b that pivotally supports the other end of the second drive shaft portion 42B, Intake for communicating the third shaft support portion 51c that pivotally supports the other end of the second driven shaft 46 and the meshing start side of the second drive side gear 41 and the second driven side gear 45 in the second pump chamber 50e to the outside. A port 51d is formed. The first shaft support part 49a of the first casing part 49, the first shaft support part 50b of the second casing part 50, and the first shaft support part 51b of the third casing part 51 connect the respective casing parts 49, 50, 51. In the state, the shaft centers are formed so as to coincide with each other. Further, the second shaft supporting portion 49b of the first casing portion 49, the second shaft supporting portion 50c and the third shaft supporting portion 50d of the second casing portion 50, and the third shaft supporting portion 51c of the third casing portion 51 are the respective casing portions. Four
The shaft cores are formed so as to coincide with each other when 9, 50 and 51 are connected. The first pump chamber 49c of the first casing portion 49 is deeply formed in the axial direction so as to have a larger capacity than the second pump chamber 50e of the second casing portion 50.

When assembling this double gear pump, first, one end of the first drive shaft portion 42A is pivotally supported by the first shaft support portion 49a of the first casing portion 49 via the bush 52, and The first drive side gear 4 is provided in the pump chamber 49c.
Store 0. Then, one end of the first driven shaft 44 is pivotally supported by the second shaft support portion 49b of the first casing portion 49 via the bush 52, and the first driven gear 43 is meshed with the first drive gear 40. . Then, one end of the second casing portion 50 is connected to the first casing portion 49, the other end of the first drive shaft portion 42A is attached to the first shaft support portion 50b, and the first shaft support portion 50c is attached to the first shaft support portion 50c. The other ends of the driven shafts 44 are pivotally supported through the bushes 52, respectively, and are connected so that the first cover portion 50a closes the first pump chamber 49c. Next, one end of the second drive shaft portion 42B is rotatably supported by the first shaft supporting portion 50b of the second casing portion 50 via the bush 52, and is rotatably supported first with respect to the first shaft supporting portion 50b. The other end of the first drive shaft portion 42A is connected to one end of the second drive shaft portion 42B via a coupling 48 so that torque can be transmitted.
The second drive side gear 41 is housed in the second pump chamber 50e of 0. Then, the third shaft support portion 51 of the second casing portion 50.
One end of the second driven shaft 46 is pivotally supported by c via the bush 52, and the second driven gear 45 is meshed with the second drive gear 41. After that, the second casing part 5
0 to the other end portion of the third casing portion 51, the first shaft support portion 51b to the other end of the second drive shaft portion 42B, the third shaft support portion 51c to the other end of the second driven shaft 46. , And each of them is pivotally supported via a bush 52, and the second cover portion 51 thereof is provided.
The second pump chamber 50e of the second casing portion 50 is connected by a so as to close the second pump chamber 50e.

Further, an output shaft (not shown) is connected to the input portion 42a of the drive shaft 42 in the dual gear pump constructed as described above, and piping is provided for the suction port 51d and the discharge ports 49d, 50g. By performing the above, the first drive side gear 40 and the first driven side gear 43, and the second drive side gear 41 and the second driven side gear 45 are meshed and rotated with the rotation of the drive shaft 42, thereby sucking the fluid. After being sucked from the port 51d and flowing along the peripheral surfaces of the pump chambers 49c and 50e formed in the casing 47, the gas can be discharged from the discharge ports 49e and 50g. Incidentally, reference numeral 53 shown in FIGS.
Is a first side plate for balancing the pressure in the first pump chamber 49c. Reference numeral 54 represents the second pump chamber 50e.
It is a second side plate that balances the pressure of. Reference numeral 55 is an oil seal that prevents leakage of fluid from the first shaft support portion 49a of the first casing portion 49. Code 5
Reference numeral 6 is a parallel pin for matching the phases of the casing parts 49, 50, 51 when the casing parts 49, 50, 51 are connected. Reference numeral 57 indicates each casing portion 4 by being screwed into a screw hole 49e formed in the first casing portion 49.
These are through bolts for connecting and fixing 9, 50 and 51.

In other words, even in the above structure, a double gear pump can be formed while the casing 47 has a three-divided structure. Therefore, two sets of independent gear pumps having a two-divided structure casing should be directly connected. As a result, the number of parts and the number of assembling steps can be reduced as compared with a casing having a four-divided structure. Moreover, even in the case of the above-described configuration, in the same manner as in the first and second embodiments described above, when configuring a triple gear pump, the casing 47 thereof and one of the second casing parts 50 are provided. It is possible to make a four-division structure by simply adding. That is, even in the case of the above-described configuration, the more the gear pump is configured in a multiple manner, the more the number of parts and the number of assembling steps can be reduced. Furthermore, since the drive shaft 42 has a two-part structure, it is possible to directly connect the third casing portion 51 to the first casing portion 49 without the need to prepare drive shafts having different lengths or the labor of replacing the drive shaft. A gear pump can be constructed.

Therefore, even with the above structure, it is possible to reduce the size as a multiple gear pump, reduce the manufacturing cost, and reduce the assembling work. In addition, in the case of constituting a single gear pump. It is also possible to reduce the manufacturing cost.

[Other Embodiments] Other embodiments of the first embodiment of the present invention will be listed below. The drive shaft 3 with the steel ball 9 interposed between the first drive side gear 1
The second drive gear 2 is mounted on the other end side of the drive shaft 3 so as to be able to transmit the torque by being integrally formed with the drive shaft 3. You may do it. Further, both the first drive-side gear 1 and the second drive-side gear 2 are fitted and connected to the drive shaft 3 with the steel ball 9 interposed, so that the first drive-side gear 1 is connected to one end side of the drive shaft 3. , The second drive gear 2 is on the other end side of the drive shaft 3,
You may make it attach so that a torque can be transmitted. The drive shaft 3 and the first drive side gear 1 or the second drive side gear 2 may be fitted and connected by interposing a parallel key or a half-moon key, or by a spline. . The first drive gear 1 and the second drive gear 2, and the first driven gear 4 and the second driven gear 6 may be formed to have the same width. Further, the second drive-side gear 2 and the second driven-side gear 6 may be formed wider than the first drive-side gear 1 and the first driven-side gear 4. The suction port 10d may be formed in the third casing portion 12, or may be formed in both the first casing portion 10 and the third casing portion 12. In the latter case, the communication passage 11f is unnecessary.

Other embodiments of the second embodiment of the present invention will be listed below. The first driven gear 20 is attached to one end side of the first driven shaft 22 by a fitting connection with the first driven shaft 22 with the half-moon key 28 interposed therebetween so that torque can be transmitted, and the second driven gear 21 May be integrally formed with the first driven shaft 22 to be mounted on the other end side of the first driven shaft 22 so that torque can be transmitted. Further, both the first driven side gear 20 and the second driven side gear 21 are provided with the first driven shaft 2 in which the half-moon key 28 is interposed.
The first driven side gear 20 is mounted on one end side of the first driven shaft 22 and the second driven side gear 21 is mounted on the other end side of the first driven shaft 22 so as to be able to transmit torque, respectively, by fitting connection with the second driven side gear 20. You may do it. The first driven shaft 22 and the first driven side gear 20 or the second driven side gear 21 may be fitted and connected by interposing a steel ball or a parallel key, or by a spline. Good. The first driven gear 20 and the second driven gear 21, and the driving gear 23 and the third driven gear 25 may be formed to have the same width, respectively. And the third driven gear 25 to the first driven gear 20.
It may be formed wider than the drive-side gear 23. The suction port 29d may be formed in the third casing portion 31, or may be formed in both the first casing portion 29 and the third casing portion 31. In the latter case, the communication passage 30f is unnecessary.

Other embodiments of the third embodiment of the present invention will be listed below. The other end of the first drive shaft portion 42A and the one end of the second drive shaft portion 42B are formed with meshing claw portions, and the meshing claw portions are meshed with each other, whereby the first drive shaft portion 42A and the second drive shaft portion The portion 42B may be connectable so that torque can be transmitted. The first drive side gear 40 and the second drive side gear 41, and the first driven side gear 43 and the second driven side gear 45 may be formed to have the same width, respectively. The gear 41 and the second driven gear 45 may be formed wider than the first drive gear 40 and the first driven gear 43. The suction port 51d may be formed in the first casing portion 49, or may be formed in both the first casing portion 49 and the third casing portion 51. In the latter case, the communication passage 50f is unnecessary.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a vertical plan view showing a configuration of a dual gear pump according to a first embodiment.

FIG. 2 is a cross-sectional side view showing the configuration of the dual gear pump in the first embodiment.

FIG. 3 is a vertical sectional front view showing a configuration of a dual gear pump according to the first embodiment.

FIG. 4 is a vertical plan view showing the configuration of a triple gear pump according to the first embodiment.

FIG. 5 is a vertical plan view showing the configuration of a dual gear pump according to a second embodiment.

FIG. 6 is a cross-sectional side view showing a configuration of a dual gear pump according to a second embodiment.

FIG. 7 is a vertical sectional front view showing the configuration of a dual gear pump according to a second embodiment.

FIG. 8 is a vertical plan view showing the configuration of a dual gear pump according to a third embodiment.

FIG. 9 is a cross-sectional side view showing a configuration of a dual gear pump according to a third embodiment.

FIG. 10 is a vertical sectional front view showing the configuration of a dual gear pump according to a third embodiment.

[Explanation of symbols]

 1 1st drive side gear 2 2nd drive side gear 3 Drive shaft 4 1st driven side gear 5 1st driven shaft 6 2nd driven side gear 7 2nd driven shaft 8 Casing 10a 1st shaft supporting part 10b 2nd shaft supporting part 10c 1st pump chamber 10 1st casing part 11a 1st cover part 11b 1st shaft support part 11c 2nd shaft support part 11d 3rd shaft support part 11e 2nd pump chamber 11 2nd casing part 12a 2nd cover part 12b 1st shaft support part 12c Third shaft support portion 12 Third casing portion 20 First driven side gear 21 Second driven side gear 22 First driven shaft 23 Drive side gear 24 Drive shaft 25 Third driven side gear 26 Second driven shaft 27 Casing 29a First shaft Support part 29b Second shaft support part 29c First pump chamber 29 First casing part 30a First cover part 30b First shaft support part 30c Second shaft support part 30d Third shaft support part 30e Two pump chambers 30 Second casing part 31a Second cover part 31b Second shaft support part 31c Third shaft support part 31 Third casing part 40 First drive side gear 41 Second drive side gear 42 Drive shaft 43 First driven side gear 44 1st driven shaft 45 2nd driven side gear 46 2nd driven shaft 47 Casing 42A 1st drive shaft part 42B 2nd drive shaft part 49a 1st shaft support part 49b 2nd shaft support part 49c 1st pump chamber 49 1st casing part 50a 1st cover part 50b 1st shaft support part 50c 2nd shaft support part 50d 3rd shaft support part 50e 2nd pump chamber 50 2nd casing part 51a 2nd cover part 51b 1st shaft support part 51c 3rd shaft support part 51 3rd casing part

Claims (3)

[Claims] 1. A drive shaft (3) having a first drive gear (1) and a second drive gear (2) mounted so that torque can be transmitted.
A first driven shaft (5) having a first driven gear (4) meshing with the first drive gear (1) and a second driven shaft meshing with the second drive gear (2). A second driven shaft (7) to which a side gear (6) is mounted, and a casing (8) surrounding the second driven shaft (7), the first drive side gear (1) and the second drive side gear (2).
One of them has a structure in which it is attached to the drive shaft (3) by fitting and coupling, and the casing (8) includes a first shaft support portion (10a) that supports the drive shaft (3), A second shaft support portion (10b) for supporting the first driven shaft (5); a first pump chamber (10c) for accommodating the first drive side gear (1) and the first driven side gear (4); The first casing part (1
0) and a first cover part (11a) that closes the first pump chamber (10c), a first shaft support part (11b) that supports the drive shaft (3), and the first driven shaft ( 5) a second shaft supporting portion (11c) for supporting the shaft, and the second driven shaft (7).
Casing having a third shaft support portion (11d) for supporting the shaft and a second pump chamber (11e) for accommodating the second drive gear (2) and the second driven gear (6). Department (1
1), a second cover portion (12a) that closes the second pump chamber (11e), a first shaft support portion (12b) that supports the drive shaft (3), and a second driven shaft ( 7) A multiple gear pump having a third casing part (12) in which a third shaft support part (12c) for supporting the shaft is formed. 2. A first driven shaft (22), to which a first driven gear (20) and a second driven gear (21) are mounted so that torque can be transmitted, meshes with the first driven gear (20). Drive shaft (24) having a drive gear (23) mounted thereon for transmitting torque, and a second driven shaft having a third driven gear (25) meshing with the second driven gear (21). (2
6) and a casing (27) surrounding them, the first driven gear (20) and the second driven gear (2).
1) One of the first driven shafts (22) is fitted and connected to the first driven shaft (22) to connect the casing (27) to the drive shaft (24). ) And the first driven shaft (22)
A first casing part (29b) for rotatably supporting and a first pump chamber (29c) for accommodating the drive side gear (23) and the first driven side gear (20). Two
9), and a first cover portion (30a) that closes the first pump chamber (29c), a first shaft support portion (30b) that pivotally supports the drive shaft (24), and the first driven shaft ( 22)
The second driven shaft (30c), the third driven part (30d) that supports the second driven shaft (26), the second driven gear (21), and the third driven gear ( 25), and a second casing portion (30) in which a second pump chamber (30e) is housed, and the second pump chamber (30).
e) a second cover portion (31a) for closing the second driven shaft (22), a second shaft supporting portion (31b) for supporting the first driven shaft (22), and a third shaft for supporting the second driven shaft (26). A multiple gear pump having a third casing part (31) in which a support part (31c) is formed as a three-part structure. 3. A drive shaft (42) having a first drive gear (40) and a second drive gear (41) mounted for torque transmission, and a first drive gear (40) meshing with the drive shaft (42). First driven shaft (44) with one driven gear (43) mounted
A second driven shaft (46) fitted with a second driven gear (45) meshing with the second drive gear (41), and a casing (47) surrounding them. The drive shaft (42) includes a first drive shaft portion (42A) to which the first drive gear (40) is attached and a second drive shaft portion (42B to which the second drive gear (41) is attached. ) Has a two-part structure in which torque transmission is possible, and the casing (47) is connected to the first drive shaft portion (42).
A) a first shaft supporting portion (49a), a second shaft supporting portion (49b) supporting the first driven shaft (44), the first drive side gear (40) and a first driven side. A first casing part (49) having a first pump chamber (49c) accommodating a gear (43), and the first pump chamber (49)
c) a first cover part (50a), a first shaft support part (50b) that supports the first drive shaft part (42A) and the second drive shaft part (42B), and the first driven shaft. (44)
The second driven shaft (50c), the third driven part (50d) that supports the second driven shaft (46), the second drive gear (41) and the second driven gear ( 45) and a second casing (50) in which a second pump chamber (50e) is housed, and the second pump chamber (50).
e) a second cover part (51a) for closing the first drive shaft part (42B) and a first shaft support part (51b) for supporting the second drive shaft part (42B).
A third shaft support portion (51) that supports the second driven shaft (46).
c) A multiple gear pump having a third casing part (51) in which is formed with three parts.