JP3760297B2 - Combined gear pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite gear pump capable of supplying hydraulic oil for lubrication of each part of an internal combustion engine, a control device for intake and exhaust valves, and the like.
[0002]
[Prior art]
As this type of composite gear pump, for example, Japanese Utility Model Laid-Open No. 50-114705 discloses a ring-shaped first gear-like member having teeth on the inner and outer circumferences in a recess formed in a pump housing, A second gear-shaped member having external teeth meshing with the inner teeth of the first gear-shaped member is rotatably accommodated to constitute a first gear pump, and the first gear-shaped member and the first gear-shaped member A composite gear pump is shown in which a second gear pump is constituted by a third gear-like member having external teeth meshing with external teeth.
[0003]
A suction port and a discharge port that are common to the first gear pump and the second gear pump are opened in the recess of the pump housing.
[0004]
In the composite gear pump, hydraulic oil is sucked into the first gear pump and the second gear pump from the suction port by the rotation of each gear-like member, and is transported by the tooth groove of each gear-like member and then discharged from the discharge port. .
[0005]
[Problems to be solved by the invention]
Here, in the conventional example, the suction port is provided in common to the first gear pump and the second gear pump.
[0006]
For this reason, there is no particular problem when the first gear pump and the second gear pump of the composite gear pump handle the same hydraulic fluid, but both mix when trying to handle hydraulic fluids having different properties. It will be.
[0007]
The present invention has been devised in view of the above-mentioned conventional situation, and provides a composite gear pump in which each of the first gear pump and the second gear pump can handle hydraulic oils having different properties without mixing them. The purpose is to do.
[0008]
[Means for Solving the Problems]
Accordingly, the invention according to claim 1 meshes with the ring-shaped first gear-shaped member having teeth on the inner and outer circumferences in the recess formed in the pump housing, and the inner teeth of the first gear-shaped member. A first gear pump that can rotatably accommodate a second gear-like member having external teeth to suck hydraulic oil in an oil pan and supply it to the main gallery via an oil filter is provided . at the composite gear pump formed by forming the second gear pump by a third gear-like member having external teeth meshing with the external teeth of the gear-like member and the first gear member, in a recess of the pump housing, the a first suction port and a first discharge port for one gear pump causes opening, the second intake port and a second discharge port for a second gear pump is opened, the first suction port communicating with said oil pan The first discharge port is configured to be able to supply hydraulic oil to the main gallery via the oil filter, and the second suction port communicates with the main gallery, and the second discharge port Is communicated with the valve control device, and further, in the recess, covers the outer peripheral side of the first gear-shaped member, and the first teeth port and the external teeth of the first gear-shaped member and the first suction port for the first gear pump and characterized in that a partition wall member for at least blocking the communication between, Further, an invention according to claim 2, wherein the partition member is for the outer teeth of the first gear member first pump it characterized in that to block the communication between the first discharge port.
[0009]
The invention according to claim 3 is configured such that, in the configuration of the invention according to claim 1 or claim 2 , the partition member covers the outer peripheral surface and the side surface of the external teeth of the first gear-shaped member. It is.
[0010]
Here, the teeth formed on the first gear-shaped member, the second gear-shaped member, and the third gear-shaped member are teeth corresponding to teeth in addition to teeth having an involute curve, a sine curve, a trochoid curve, and the like, For example, those having rollers or the like are also included.
[0011]
In such a configuration, hydraulic oil having different properties can be guided to the first suction port for the first gear pump and the second suction port for the second gear pump, respectively. The hydraulic oil guided to the port is discharged to the first discharge port, while the second gear pump can discharge the hydraulic oil guided to the second suction port to the second discharge port.
[0012]
For example, the hydraulic oil in the reservoir is guided to the first suction port for the first gear pump, and the first gear pump discharges the hydraulic oil to the first discharge port, while the second suction for the second gear pump. The port is led to clean hydraulic fluid after the hydraulic fluid discharged to the first discharge port of the first gear pump is filtered, and the second gear pump discharges this hydraulic oil to the second discharge port.
[0013]
At this time, the first gear pump conveys the hydraulic oil guided to the first suction port through the tooth gap of the internal tooth of the first gear-like member and the tooth gap of the external tooth of the second gear-like member, Discharge to discharge port. The second gear pump conveys the hydraulic oil guided to the second suction port by the external tooth groove of the first gear-shaped member and the external tooth groove of the third gear-shaped member, Discharge to discharge port.
[0014]
Here, in the present invention, each gear pump has a corresponding suction port and discharge port, and the outer peripheral side of the first gear-like member is covered in the recess where each suction port and discharge port opens. In addition, a partition member is provided that blocks communication between the external teeth of the first gear-shaped member and the first suction port and the first discharge port for the first gear pump.
[0015]
For this reason, the hydraulic oil guided to the second suction port of the second gear pump is transported by the external tooth groove of the first gear-shaped member and passes through the first suction port and the first discharge port of the first gear pump. At this time, since the communication between the external teeth of the first gear-shaped member and the first suction port and the first discharge port is blocked by the partition wall member, it is mixed with the hydraulic oil in the first suction port and the first discharge port. There is nothing.
[0016]
Accordingly, a composite gear pump is obtained in which each of the first gear pump and the second gear pump can handle hydraulic oil having different properties without mixing them.
[0017]
According to the second aspect of the present invention, since the partition member covers the outer peripheral surface and the side surface of the external teeth of the first gear-shaped member, the degree of freedom in forming the first suction port and the first discharge port. Can be increased.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as an aspect in which the present invention is applied to a composite gear pump that supplies hydraulic oil to a hydraulic circuit of an internal combustion engine.
[0019]
1 is a cross-sectional view of a composite gear pump showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.
[0020]
In the figure, 1 is a first gear pump and 2 is a second gear pump. The first gear pump 1 includes a ring-shaped first gear-like member 7 having teeth 5 and 6 on the inner and outer circumferences in a circular recess 4 formed in the pump housing 3 and the first gear-like member 7. A second gear-like member 9 having external teeth 8 meshing with the internal teeth 6 is rotatably accommodated.
[0021]
The second gear pump 2 includes a first gear-like member 7 and a third gear-like member 11 having external teeth 10 that mesh with the external teeth 6 of the first gear-like member 7. The gear-shaped member 11 is rotatably accommodated in a circular recess 12 formed in the pump housing 3. The recess 12 that accommodates the third gear-like member 11 of the second gear pump 2 is formed with a smaller diameter than the recess 4 that accommodates the first gear-like member 7 of the first gear pump 1.
[0022]
The pump housing 3 includes a body 3a in which a recess 4 and a recess 12 are formed and a cover 3b covering the recess 4 and the recess 12 (see FIG. 2). The recess 4 of the pump housing 3 includes a first gear pump 1. The first suction port 14 and the first discharge port 15 for the second gear pump 2 are opened, and the second suction port 16 and the second discharge port 17 for the second gear pump 2 are opened. The second suction port 16 and the second discharge port 17 are opened in the recess 4, and at the same time, are opened in the recess 12 that houses the third gear-like member 11. The first suction port 14 and the first discharge port 15 are formed in the body 3a of the pump housing 3 in this embodiment.
[0023]
The recess 4 of the pump housing 3 is meshed with the internal teeth 5 of the first gear-shaped member 7 and the external teeth 8 of the second gear-shaped member 9 as the first gear-shaped member 7 rotates. The suction port 18 that communicates with the first suction port 14 is open facing the region where the gap increases, and the discharge port 19 that communicates with the first discharge port 15 is open facing the region where the meshing clearance decreases. is doing.
[0024]
The first suction port 14 communicates with an oil pan (not shown) via a first suction passage 21, and the first discharge port 15 communicates with the main gallery via a first discharge passage 22 and an oil filter (not shown). is doing. Thus, the first gear pump 1 can suck the hydraulic oil in the oil pan (not shown) and supply the hydraulic oil to the main gallery via the oil filter (not shown).
[0025]
The second suction port 16 communicates with a main gallery not shown through a second suction passage 23, and the second discharge port 17 communicates with a valve control device not shown through a second discharge passage 24. is doing. Thereby, the second gear pump 2 can suck clean hydraulic oil in the main gallery that has passed through an oil filter (not shown) and supply the hydraulic oil to a valve control device (not shown).
[0026]
The first gear-like member 7 is rotatably accommodated in the recess 4 of the pump housing 3, and the internal teeth 5 formed on the inner periphery of the first gear-like member 7 are based on a trochoidal curve. It has a tooth profile shape consisting of a high-order function curve, and is formed over the entire width in the axial direction. Further, the external teeth 6 formed on the outer periphery of the first gear-shaped member 7 have a tooth profile formed of an involute curve, and are formed only in a predetermined length in the axial direction, and the remaining portion is formed by a tooth profile. It is the guide part 26 which is not performed.
[0027]
The guide portion 26 formed over the entire circumference in a part of the outer circumference of the first gear-shaped member 7 has the same outer diameter as that of the outer teeth 6 or preferably slightly larger. It is formed and slidably contacts the inner peripheral surface of the recess 4 of the pump housing 3 to guide the rotation of the first gear-like member 7.
[0028]
Further, the first gear-like member 7 is arranged such that the side on which the guide portion 26 is formed faces the bottom surface of the recess 4 of the pump housing 3 and the side on which the external teeth 6 are formed faces the cover 3b ( (See FIG. 2).
[0029]
The second gear-shaped member 9 is arranged slightly eccentric with respect to the first gear-shaped member 7, and is connected to the drive shaft 27. The external teeth 8 formed on the outer periphery of the second gear-shaped member 9 are: Similar to the internal teeth 5 of the first gear-shaped member 7, it has a tooth profile formed of a higher-order function curve based on a trochoid curve, and is formed over the entire axial width. Further, the number of teeth of the external teeth 8 of the second gear-shaped member 9 is 8 less than the number of teeth of 9 of the internal teeth 5 of the first gear-shaped member 7.
[0030]
The third gear-shaped member 11 is supported by a shaft 28 and is rotatably accommodated in a recess 12 formed in the pump housing 3. The external teeth 10 formed on the third gear-shaped member 11 are the first gears. Similar to the external teeth 6 of the gear-like member 7, it has a tooth profile formed of an involute curve. Further, the external teeth 10 of the third gear-shaped member 11 are formed over the entire area in the axial direction.
[0031]
Reference numeral 30 denotes a partition member disposed in the recess 4, and the partition member 30 can be formed of a metal material or a synthetic resin material. The partition member 30 covers the outer peripheral side of the first gear-shaped member 7, the external teeth 6 of the first gear-shaped member 7, the first suction port 14 and the first discharge port 15 for the first gear pump 1, The communication of is blocked. Further, the partition member 30 is arranged such that the first gear-like member 7 has the guide portion 26 and the side on which the external teeth 6 are formed faces the cover 3b. Is covered and covers the outer peripheral surface of the external tooth 6 (see FIG. 3).
[0032]
In such a configuration, when the second gear-shaped member 9 is rotated clockwise in FIG. 1 by the drive shaft 27, the first gear pump 1 causes the hydraulic oil in the oil pan (not shown) to flow through the first suction passage 21 and the first suction passage 21. The oil is sucked in through the first suction port 14, the hydraulic oil is discharged into the first discharge port 15, and is supplied to the main gallery through the first discharge passage 22 and an oil filter (not shown). The second gear pump sucks clean working oil in the main gallery that has passed through an oil filter (not shown) through the second suction passage 23 and the second suction port 16, and discharges the working oil to the second discharge. It discharges to the port 17 and is supplied to a valve control device (not shown) through the discharge passage 24.
[0033]
At this time, the first gear pump 1 causes the working oil guided from the first suction port 14 to the suction port 18 to pass through the tooth grooves of the inner gear 5 of the first gear-like member 7 and the outer teeth 8 of the second gear-like member 9. And is discharged from the discharge port 19 to the first discharge port 15. In addition, the second gear pump 2 causes the hydraulic oil guided to the second suction port 16 to pass through the tooth groove of the external tooth 6 of the first gear-like member 7 and the tooth groove of the external tooth 10 of the third gear-like member 11. It is conveyed and discharged to the second discharge port 17.
[0034]
Here, in the present invention, each of the gear pumps 1 and 2 has the corresponding intake ports 14 and 16 and the discharge ports 15 and 17, respectively, and the intake ports 14 and 16 and the discharge ports 15 and 17 are opened. In the recess 4, the outer peripheral side of the first gear-shaped member 7 is covered, the first teeth 14 of the first gear-shaped member 7, the first suction port 14 and the first discharge port 15 for the first gear pump 1, A partition wall member 30 is provided to block the communication.
[0035]
For this reason, the hydraulic fluid guided to the second suction port 16 of the second gear pump 2 is conveyed by the tooth groove of the external tooth 6 of the first gear-shaped member 7, and the first suction port 14 and the first suction port 14 of the first gear pump 1 are transported. Since the communication between the external teeth 6 of the first gear-like member 7 and the first suction port 14 and the first discharge port 15 is blocked by the partition member 30 when passing through the one discharge port 15, these first suction ports 14 and the hydraulic oil in the first discharge port 15 are not mixed.
[0036]
Therefore, each of the first gear pump 1 and the second gear pump 2 can provide a composite gear pump that can handle hydraulic oils having different properties without mixing them.
[0037]
4 and 5 are views showing another embodiment of the present invention. This embodiment is different from the above embodiment in that the section of the partition wall member 30 covering the outer peripheral side of the first gear-like member 7 is shown. The shape is changed such that the partition wall member 30 covers the outer peripheral surface and the side surface of the first gear-shaped member.
[0038]
That is, in the embodiment shown in FIG. 4, when the first suction port 14 and the first discharge port 15 opened in the recess 4 are enlarged and formed in the body 3 a and the cover 3 b of the pump housing 3, the partition member 30 is formed with an L-shaped cross-sectional shape so as to cover the outer peripheral surface and one side surface of the external teeth 6 of the first gear-shaped member 7.
[0039]
In the embodiment shown in FIG. 5, the first suction port 14 and the first discharge port 15 are enlarged and formed on the cover 3 b, and the external teeth 6 formed on the outer periphery of the first gear-shaped member 7 are provided. When formed over the entire length in the axial direction (the guide portion 26 is abolished), the partition member 30 covers the outer peripheral surface of the outer teeth 6 of the first gear-shaped member 7 and both side surfaces. It is formed with a U-shaped cross-sectional shape.
[0040]
Since other configurations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description thereof is omitted.
[0041]
Also in such an embodiment, the hydraulic fluid guided to the second suction port 16 of the second gear pump 2 is conveyed by the tooth groove of the external tooth 6 of the first gear-like member 7, and the first gear pump 1 When passing through the suction port 14 and the first discharge port 15, the communication between the external teeth 6 of the first gear-like member 7 and the first suction port 14 and the first discharge port 15 is blocked by the partition member 30. The hydraulic oil in the first suction port 14 and the first discharge port 15 is not mixed.
[0042]
Therefore, each of the first gear pump 1 and the second gear pump 2 can provide a composite gear pump that can handle hydraulic oils having different properties without mixing them.
[0043]
In addition, since the partition member 30 covers the outer peripheral surface and the side surface of the external tooth 6 of the first gear-shaped member 7, the degree of freedom in forming the first suction port 14 and the first discharge port 15 can be increased. it can.
[0044]
Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the gist of the invention. For example, the first gear pump 1 may be an internal gear pump of a type in which a crescent is provided between a ring-shaped outer rotor and an inner rotor.
[0045]
Further, in the embodiment, the partition member is provided so as to block the communication between the suction port and the discharge port, but the return path from the relief valve may be blocked.
[0046]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to obtain a composite gear pump in which each of the first gear pump and the second gear pump can handle hydraulic oils having different properties without mixing them.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a composite gear pump showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a view similar to FIG. 3, showing another embodiment of the present invention.
FIG. 5 is a view similar to FIG. 3, showing still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st gear pump 2 2nd gear pump 3 Pump housing 4 Recessed part 5 Internal tooth 6 External tooth 7 First gear-shaped member 8 External tooth 9 Second gear-shaped member 10 External tooth 11 Third gear-shaped member 14 First suction port 15 First 1 discharge port 16 2nd suction port 17 2nd discharge port 30 Partition member

Claims (3)

A ring-shaped first gear-shaped member having teeth on the inner and outer circumferences in a recess formed in the pump housing, and a second gear-shaped member having outer teeth meshing with the inner teeth of the first gear-shaped member And the first gear-shaped member and the first gear-shaped member. The first gear-shaped member and the first gear-shaped member are configured to suck the working oil in the oil pan and supply it to the main gallery via the oil filter. at the of the third gear-like member having external teeth meshing with the external teeth formed by constituting the second gear pump composite gear pump,
Opening a first suction port and a first discharge port for the first gear pump in the recess of the pump housing, and opening a second suction port and a second discharge port for the second gear pump;
The first suction port communicates with the oil pan, the first discharge port is configured to be able to supply hydraulic oil to the main gallery via the oil filter, and the second suction port is the main suction port. While communicating with the gallery, the second discharge port communicates with the valve control device,
Furthermore, in the said recess, covering the outer periphery of the first gear member, the partition wall member at least block the communication between the first intake port for the external teeth and the first gear pump in the first gear-like member A composite gear pump characterized by being provided. The partition member, the composite of 請 Motomeko 1, wherein that you block the communication between the first discharge port for the outer teeth of the first gear member first pump gear pump. 3. The composite gear pump according to claim 1, wherein the partition member covers an outer peripheral surface and a side surface of the external teeth of the first gear-shaped member.

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